Envision Geothermal Indoor Split Heat Pumps User manual

Brand: Envision

Model: Geothermal Indoor Split Heat Pumps

Category: Heat pumps

Type: User manual

Installation Information

Water Piping Connections

Desuperheater Connections

Electrical

Startup Procedures

Troubleshooting

Preventive Maintenance

IM1592 06/07

Envision Series Geothermal Indoor Split Heat Pumps

• R-410A Refrigerant

• 2 - 6 Ton Single Speed

• 2 - 6 Ton Dual Capacity

Envision Split Installation Manual

ENVISION SERIES INSTALLATION MANUAL

Model Nomenclature

N D Z 049 A 1 1 A C

Coax Options

Model Type C= Copper

N= Envision N= Cupronickel

Compressor Type Open Option

D= Dual Capacity A= Standard

S= Single Speed

Hot Water Option

Cabinet Configuration 0= None

Z= Indoor Split 1= Hot Water Gerneration with

factory installed pump

Unit Capacity

Voltage

Vintage 1= 208-230/60/1

A= Current

Physical Characteristics

Model 022 030 036 042 048 060 070 026 038 049 064 072

Compressor (1 each)

Factory Charge R410a, oz [kg]

[1.59]

[2.1]

[2.55]

[2.61]

108

[3.06]

[1.47]

[1.59]

[2.55]

[2.61]

104

[2.95]

Coax and Water Piping

Water Connections Size - Swivel- in [mm]

1 [25.4]

HWG Connection Size - Swivel - in [mm]

1 [25.4]

Coax & Piping Water Volume - gal [l]

0.7

[2.6]

1.0

[3.8]

1.3

[4.9]

1.3

[4.9]

1.6

[6.1]

1.6

[6.1]

2.3

[8.7]

0.7

[2.6]

1.3

[4.9]

1.6

[6.1]

1.6

[6.1]

2.3

[8.7]

Weight - Operating, lb [kg]

164

[74]

174

[79]

212

[96]

213

[97]

246

[112]

251

[114]

292

[132]

189

[186]

236

[107]

250

[113]

271

[123]

290

[132]

Weight - Packaged, lb [kg]

184

[83]

194

[88]

232

[105]

233

[106]

266

[121]

271

[123]

312

[142]

209

[95]

256

[116]

270

[122]

291

[132]

310

[141]

Notes:

All units have TXV expansion devices, and 1/2" [12.2mm] & 3/4" [19.1mm] electrical knockouts.

Rev.:6/7/07

1 [25.4]

Single Speed Scroll Dual Capacity Scroll

1 [25.4]

ENVISION SERIES INSTALLATION MANUAL

Table of Contents

Model Nomenclature 2

Physical Characteristics 2

General Installation Information 4-8

Air Handler Coil Data 9

Line Set Sizes 9

Open Loop Well Water Systems 10-11

Closed Loop Ground Source Systems 12

Desuperheater 13-14

Electical Data 14

Thermostat Wiring 15

Wiring Schematics 16-17

Microprocessor Control Features and Operation 18-19

Operation Logic Data 20

DIP Switch Settings 21

Refrigeration 22-25

Unit Operating Parameters 26-27

Unit Startup 28-30

Pressure Drop & Recommended Flow Rates 31

Troubleshooting 32

Preventive Maintenance 33

Replacement Procedures 33

Physical Dimensions 34

ENVISION SERIES INSTALLATION MANUAL

Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electri-

cal components. Only trained and qualied service personnel should install, repair or service heating and air conditioning

equipment. Untrained personnel can perform the basic maintenance functions of cleaning coils and cleaning and replacing

lters. All other operations should be performed by trained service personnel. When working on heating and air conditioning

equipment, observe precautions in the literature, tags and labels attached to the unit and other safety precautions that may

apply, such as the following safety measures:

Follow all safety codes.

Wear safety glasses and work gloves.

Use a quenching cloth for brazing operations.

Have a re extinguisher available for all brazing operations.

Moving and Storage

Move units in the normal “up” orientation. Units may be moved and stored per the information on the packaging. Do not

stack more than three units in total height. Do not attempt to move units while stacked. When the equipment is received, all

items should be carefully checked against the bill of lading to be sure all crates and cartons have been received. Examine

units for shipping damage, removing the units from the packaging if necessary. Units in question should also be internally

inspected. If any damage is noted, the carrier should make the proper notation on the delivery receipt, acknowledging the

damage.

Unit Location

Locate the unit in an indoor area that allows for easy removal of the access panels. Location should have enough space

for service personnel to perform maintenance or repair. Provide sufcient room to make water, electrical and refrigerant line

connections. Any access panel screws that would be difcult to remove after the unit is installed should be removed prior to

setting the unit. Care should be taken when units are located in unconditioned spaces to prevent damage from frozen water

lines and excessive heat that could damage electrical components.

Air Coil Location

Refer to the air handler manufacturer’s instructions for the blower coil unit for details on installing the air handling portion

of the system.

Condensate Drain

Follow the blower coil manufacturer’s instructions.

Duct System

All blower coil units/air coils must be installed as specied by the manufacturer’s installation instructions; however, the

following recommendations should considered to minimize noise and service problems.

An air lter must always be installed upstream of the air coil on the return air side of the air handler or furnace. If there

is limited access to the lter rack for normal maintenance, it is suggested that a return air lter grill be installed. Be sure that

the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the lter and plugging the air

coil.

In applications using galvanized metal ductwork, a exible duct connector is recommended on both the supply and

return air plenums to minimize vibration from the blower. To maximize sound attenuation of the unit blower, the supply and

return plenums should include an internal duct liner of 1-inch thick glass ber or be constructed of ductboard. Insulation is

usually not installed in the supply branch ducts. Ducts in unconditioned areas should be wrapped with a minimum of 1-inch

duct insulation. Application of the unit to uninsulated ductwork in an unconditioned space is not recommended as the unit’s

performance will be adversely affected. If the air handler is connected to existing ductwork, a previous check should have

been made to assure that the duct system has the capacity to handle the air required for the unit application. If ducting is too

•

WARNING: Before performing service or maintenance operations on a system, turn off main power switches

to the indoor unit. If applicable, turn off the accessory heater power switch. Electrical shock could cause

personal injury.

Safety Considerations

General Installation Information

ENVISION SERIES INSTALLATION MANUAL

small, as in replacement of heating only systems, larger ductwork should be installed. All existing ductwork should be

checked for leaks and repairs made accordingly. The duct systems and diffusers should be sized to handle the design

airow quietly. If air noise or excessive airow is a problem, the blower speed can be changed to a lower speed to

reduce airow. This will reduce the performance of the unit slightly in heating; however, it will increase the temperature

rise across the air coil. Airow must still meet minimum requirements.

Equipment Selection

The following guidelines should be used when mating an Envision Split to an air handler/coil.

Select R-410A components only.

Select 12 SEER or higher air handler/coil.

Match the air handler to the air handler coil data table on page 9.

Indoor matching adjustable TXV should be used with any air handler/coil. Fixed orice or cap tube systems

should not be used.

Utilizing Existing Coil or Air Handler

It is recommended that a new R-410A air handler be installed with an Envision Split considering the long term ben-

ets of reliability, warranty, etc. versus the short term installation cost savings. However, the existing air handler may be

retained provided the following:

Coil currently is R-410A rated

Coil uses a TXV. No capillary or xed orice systems should be used

A life expectancy of more than 7 years remaining for the air handler and components

•

General Installation Information (continued)

ENVISION SERIES INSTALLATION MANUAL

Disconnect

Thermostat Wire

From Air Handler

Vibration Absorbing Pad or Air Pad

P/T Plugs

Water Out

Water In

Lineset To Air Handler

Insulated Suction Line

Supply

Duct

Wire To

Thermostat

Return

Duct

Condensate Drain

(must be trapped)

To Drain

Remote Air Handler

(Maximum Recommended Distance is

50' Between Units)

DHW In

DHW Out

Figure 1: Typical Split System Application with Remote Blower Coil

Air Handler Installation

Air handlers used with dual capacity units must be capable of operating with a minimum of 2 blower speeds. Refer to the

manufacturer’s instructions for the blower coil unit for details on installing the air handling portion of the system. All blower

coil units/air coils must be installed as specied by the manufacturer’s installations instructions. However, the following rec-

ommendations should be considered to minimize noise and service problems.

An air lter must always be installed upstream of the air coil on the return air side of the air handler of furnace. If there is

limited access to the lter rack for normal maintenance, it is suggested that a return air lter grille be installed. Be sure that

the return duct is properly installed and free of leaks to prevent dirt and debris from bypassing the lter and plugging the air

coil.

Ensure that the line set size is appropriate to the capacity of the unit (refer to page 9). Line sets should be routed as di-

rectly as possible, avoiding unnecessary bends or turns. All wall penetrations should be sealed properly. Line set should not

come into direct contact with water pipes, oor joists, wall studs, duct work, oors, walls and brick. Line set should not be

suspended from joists or studs with a rigid wire or strap which comes into direct contact with the tubing. Wide hanger strips

which conform to the shape of the tubing are recommended. Isolate hanger straps from line set insulation by using metal

sleeves bent to conform to the shape of insulation. Line set insulation should be pliable, and should completely surround the

refrigerant line.

Notes: Improper installation of equipment may result in undesirable noise levels in the living areas.

Connection to Air Coil

Figures 1 and 2 illustrate typical Envision Split installations. The table on page 9 shows typical lineset diameters and

maximum length. Linesets over 60 feet are not recommended. If the lineset is kinked or deformed and cannot be reformed,

the bad section of pipe should be replaced. A restricted lineset will affect unit performance. As in all R-410A equipment, a

reversible liquid line lter drier is required to insure all moisture is removed from the system. This drier should be replaced

whenever “breaking into” the system for service. All linesets should be insulated with a minimum of 1/2” closed cell insula-

tion. All exterior insulation should be painted with UV resistant paint or covering to insure long insulation life.

ENVISION SERIES INSTALLATION MANUAL

Dual Fuel Systems

Envision units can be connected to fossil fuel furnaces that include an A-coil or slab coil. Dual fuel installations utilize the

Envision heat pump for heating until the point that auxiliary heat is called for on the thermostat. At that point, the furnace

will be enabled and the heat pump will be disabled. The Envision heat pump provides air conditioning through the furnace’s

refrigerant coils.

Refer to the furnace manufacturer’s installation manual for the furnace installation, wiring and coil insertion. A

WaterFurnace Dual Fuel thermostat, a eld-installed DPST relay or dual capacity auxiliary heat relay is required. See Figure

2 for typical Dual Fuel application.

In add-on Envision Split applications, the coil should be located in the supply side of the furnace to avoid condensation

damage to the furnace heat exchanger. A high temperature limit should be installed upstream of the coil to de-energize the

compressor whenever the furnace is operating. Without this switch, the Envision Split will trip out on high pressure. A dual

fuel thermostat can remove the Y1 and Y2 calls when a W call is energized to allow gas furnace backup on an Envision Split

application. Refer to thermostat wiring on page 15 for details.

Disconnect

Thermostat

Wire From Furnace

Vibration Absorbing Pad or Air Pad

P/T Plugs

Wire To

Thermostat

Up-Flow

Fossil Fuel

Furnace

Condensate

Drain

(must be trapped)

"A" or

Slab Coil

Supply Duct

Air Temperature Limit Switch -

to prevent compressor operation

when entering air is greater than

90°F.

Water Out

Water In

Lineset To Air Handler

Insulated

Suction Line

DHW In

Return

Duct

DHW Out

Figure 2: Typical Split System Heat Pump Coil Add-On Fossil Fuel Furnace

ENVISION SERIES INSTALLATION MANUAL

Water Piping

The proper water ow must be provided to each unit whenever the unit

operates. To assure proper ow, use pressure/temperature ports to deter-

mine the ow rate. These ports should be located at the supply and return

water connections on the unit. The proper ow rate cannot be accurately set

without measuring the water pressure drop through the refrigerant-to-water

heat exchanger.

All source water connections on residential units are swivel piping ttings

(see Figure 3) that accept 1-inch male pipe threads (MPT) . The swivel con-

nector has a rubber gasket seal similar to a rubber hose gasket, which when

mated to the ush end of any 1-inch threaded pipe provides a leak-free seal

without the need for thread sealing tape or compound. Check to ensure that

the rubber seal is in the swivel connector prior to attempting any connection.

The rubber seals are shipped attached to the waterline. To make the connec-

tion to a ground loop system, mate the brass connector (supplied in CK4L

connector kit) against the rubber gasket in the swivel connector and thread

the female locking ring onto the pipe threads, while maintaining the brass

connector in the desired direction. Tighten the connectors by hand, then gen-

tly snug the tting with pliers to provide a leak-proof joint. When connecting

to an open loop (ground water) system, thread the 1-inch MPT tting (SCH80

PVC or copper) into the swivel connector and tighten in the same manner as

noted above. The open and closed loop piping system should include pres-

sure/temperature taps for serviceability.

Never use exible hoses smaller than 1-inch inside diameter on the unit. Limit hose length to 10 feet per connection.

Check carefully for water leaks.

Locking

Ring

Stainless

Steel

Snap Ring

Gasket

Support

Sleeve

Gasket

Material

Figure 3: Swivel Connections

(Residential Units)

ENVISION SERIES INSTALLATION MANUAL

Air Handler Coil Data

Notes: * Variable speed air handler required for all dual capacity units.

Line Set Sizes

Envision

Split Model

Matching Air

Handler

Coil Surface

Area (sq ft.)

FPI Rows

Tube

Diameter

022 - 038

042 - 072

NAH060 5.83 12 3 3/8"

NAH036 5.83 12 2 3/8"

Unit Air Factory

Size Handler

Suction Liquid Suction Liquid Suction Liquid

Charge (oz.)

NZ022 NAH036 5/8" OD 3/8" OD 5/8" OD 3/8" OD 3/4" OD 3/8" OD 56

NZ030 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 3/8" OD 56

NZ036 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56

NZ042 NAH060 3/4" OD 3/8" OD 3/4" OD 3/8" OD 7/8" OD 1/2" OD 74

NZ048 NAH060 3/4" OD 3/8" OD 7/8" OD 3/8" OD 7/8" OD 1/2" OD 90

NZ060 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 92

NZ070 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 108

NZ026 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 52

NZ038 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56

NZ049 NAH060 3/4" OD 3/8" OD 7/8" OD 3/8" OD 7/8" OD 1/2" OD 90

NZ064 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 92

NZ072 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 104

Notes: Lineset charge for R410A is 0.50 oz. per ft. for 3/8" and 1.0 oz. per ft. for 1/2" tube.

Rev.: 6/8/07

Initial Total System Charge = Factory Envision Split charge + lineset charge + 20 oz, then adjust charge by subcooling and superheat measurements.

20 feet 40 feet 60 feet

ENVISION SERIES INSTALLATION MANUAL

Open Loop - Well Water Systems

Typical open loop piping is shown below. Always maintain water pressure in the heat exchanger by placing water con-

trol valves at the outlet of the unit to prevent mineral precipitation. Use a closed bladder type expansion tank to minimize

mineral formation due to air exposure. Ensure proper water ow through the unit by checking pressure drop across the heat

exchanger and comparing it to the gures in the unit capacity data tables in the specication catalog. Usually 1.5-2 GPM of

ow per ton of cooling capacity is recommended in open loop applications. In dual capacity units, stage 1 is 70% of the total

tonnage. Therefore, due to only minor differences in ow rate from low to high, only one solenoid valve should be used. The

valve should be sized for full ow.

Discharge water from the unit is not contaminated in any manner and can be disposed of in various ways depending

on local building codes (i.e.

recharge well, storm sewer,

drain eld, adjacent stream or

pond, etc.). Most local codes

forbid the use of sanitary sewer

for disposal. Consult your local

building and zoning depart-

ments to ensure compliance in

your area.

Notes: For open loop/ground-

water systems or sytems that

do not contain an antifreeze

solution, set SW2-Switch #2

to the “WELL” position (Refer

to the table on page 21.) Slow

opening/closing solenoid valves

(type VM) are recommended to

eliminate water hammer.

Figure 4: Typical Split System Application Open Loop - Well Water

Disconnect

Thermostat Wire

From Air Handler

Vibration Absorbing Pad or Air Pad

P/T Plugs

Boiler Drains for

System Flushing

Water Solenoid

Control Valve

Rubber Bladder

Pressure Tank

Lineset

To Air Handler

Flow

Regulator

Shut-Off Valves

Water Out

Water In

From W ell

Acc Com

Acc NC

Acc NO

Solenoid

Valve

CC-GND

CCHI

Comfort

Alert

Logic Board

Violet(3)

Blk(1)

Wht(4)

VM valve

Violet(2)

Figure 9b: Open Loop Solenoid Valve Connection Option

Typical slow operating external 24V water solenoid valve

(type VM) wiring.

Figure 5: Open Loop Solenoid Valve Connection Option

Typical quick operating external 24V water solenoid valve

(type PPV100 or BPV100) wiring.

ENVISION SERIES INSTALLATION MANUAL

Solenoid Wiring

Water control valves draw their power directly from a unit’s 24V transformer and can overload and possibly burn out the

transformer. Check total VA draw of the water valve and ensure that it is under 15 VA.

Water Quality

In ground water situations where scaling could be heavy or where biological growth such as iron bacteria will be pres-

ent, a closed loop system is recommended. The heat exchanger coils in ground water systems may, over a period of time,

lose heat exchange capabilities due to a buildup of mineral deposits inside. These can be cleaned, but only by a qualied

service mechanic, as special solutions and pumping equipment are required. Desuperheater coils can likewise become

scaled and possibly plugged. In areas with extremely hard water, the owner should be informed that the heat exchanger

may require occasional ushing.

Open Loop - Well Water Systems (continued)

ENVISION SERIES INSTALLATION MANUAL

Closed Loop Ground Source Systems

Note: For closed loop systems with antifreeze protection, set SW2-2 to the “loop” position (see table on page 21).

Once piping is completed between the unit, pumps and the ground loop (see gure below), nal purging and charging

of the loop is required. A ush cart (or a 1.5 HP pump minimum) is needed to achieve adequate ow velocity in the loop

to purge air and dirt particles from the loop itself. Antifreeze solution is used in most areas to prevent freezing. Flush the

system adequately to remove as much air as possible then pressurize the loop to a static pressure of 40-50 PSI (summer)

or 50-75 PSI (winter). This is

normally adequate for good

system operation. Loop static

pressure will uctuate with the

seasons. Pressures will be

higher in the winter months

than during the cooling season.

This uctuation is normal and

should be considered when

initially charging the system.

After pressurization, be sure

to remove the plug in the end

of the loop pump motor(s) (if

applicable) to allow trapped air

to be discharged and to ensure

that the motor housing has

been ooded. Ensure that the

loop pumps provide adequate

ow through the unit(s) by

checking the pressure drop

across the heat exchanger and

comparing it to the unit capacity

data in the specication cata-

log. Usually 2.5 to 3 GPM of

ow per ton of cooling capacity

is recommended in earth loop

applications.

Multiple Units on One Flow Center

When two units are connected to one loop pumping system, pump control is automatically achieved by connecting the

SL terminals on connector P2 in both units with 2-wire thermostat wire. These terminals are polarity dependant (see Figure

8). The loop pump(s) may be powered from either unit, whichever is more convenient. If either unit calls, the loop pump(s)

will automatically start. The use of two units on one ow center is generally limited to a total of 20 GPM capacity.

Figure 7: Typical Split System Application Closed Loop - Earth Coupled

Disconnect

Thermostat Wire

From Air Handler

Vibration Absorbing Pad or Air Pad

P/T Plugs

Lineset

To Air

Handler

Insulated

Flow Center

Electrical Supply

GeoLink

Flow Center

To Loop

DHW Out

Rubber Hose Connector

Kit CK4L or CK4S

DHW In

Envision to

Electromechanical Units

Shut

Down

C C

SL1

Out

Envision Unit #1

To Electromechanical Unit

Shut

Down

C C

Shut

Down

C C

SL1

Out

SL1

Out

Single Speed

Envision Unit #1

With pump

wired to Unit 1

With pump

wired to

Unit 2

Envision to Envision

Microprocessor Units

Envision Unit #2

Single Speed

With pump

wired to Unit 1

With pump

wired to

Unit 2

Shut

Down

C C

Shut

Down

C C

SL1

Out

SL1

Out

Dual Capacity

Envision Unit #1

Envision Unit #2

Dual Capacity

Envision to Envision

Microprocessor Units

Figure 8: Primary/Secondary Hook-up

ENVISION SERIES INSTALLATION MANUAL

Figure 11: Desuperheater Installation in Preheat TankFigure 10: Typical Desuperheater Installation

Drain Valve

P/T Relief

Valve

Cold

Water In

Hot

Water Out

DHW

Water In

DHW

Water Out

Venting Waste Valve

or Vent Coupling

3/4˝ x 3/4˝ x 1/2˝ tee

Drain Valve Drain Valve

P/T Relief

Valve

Venting Waste Valve

or Vent Coupling

DHW

3/4˝ x 3/4˝ x 1/2˝ tee

Water In

Hot

Water Out

Cold

Water In

Water Out

P/T Relief

Valve

Desuperheater Connections

To maximize the benets of the desuperheater a minimum 50-gallon water heater is recommended. For higher

demand applications, use an 80-gallon water heater or two 50-gallon water heaters connected in a series as shown

below. Electric water heaters are recommended. Make sure all local electrical and plumbing codes are followed when

installing a desuperheater.

Residential units with desuperheaters contain an internal circulator and ttings.

Note: Under certain conditions, Envision dual capacity units operate with very low refrigerant discharge temperatures,

producing little or no water heating capability. This scenario occurs when the unit is operating with cold entering source

water (loop or well). Allowing the desuperheater pump to operate during these conditions actually removes heat from the

DHW circulating through the unit. To overcome this, Envision unit microprocessors have been programmed to disengage

the desuperheater pump during such conditions. (During low capacity cooling operation, the pump will operate only if

the DHW temperature entering the unit is less than the liquid line temperature plus 35º F. During high capacity cooling

operation, the pump will operate only if the DHW temperature is less than the liquid line temperature plus 60º F.) Using

a preheat tank, as shown in Figure 11, will maximize desuperheater capabilities.

CAUTION: Elements will burn out if energized dry.

Water Tank Preparation

To install a unit with desuperheater, follow these installation guidelines.

Turn off the power to the water heater.

Attach a water hose to the water tank drain connection and run the other end of the hose to an open drain or

outdoors.

Close the cold water inlet valve to the water heater tank.

Drain the tank by opening the valve on the bottom of the tank, then open the pressure relief valve or hot water

faucet.

Flush the tank by opening the cold water inlet valve to the water heater to free the tank of sediments. Close when

draining water is clear.

Disconnect the garden hose and remove the drain valve from the water heater.

Refer to Plumbing Installation and Desuperheater Startup on page 14.

ENVISION SERIES INSTALLATION MANUAL

Plumbing Installation

1. Inspect the dip tube in the water heater cold inlet for a check valve. If a check valve is present it must be removed

or damage to the desuperheater circulator will occur.

2. Remove drain valve and tting.

3. Thread the 3/4-inch NPT x 3-1/2-inch brass nipple into the water heater drain port.

4. Attach the center port of the 3/4-inch FPT tee to the opposite end of the brass nipple.

5. Attach the 1/2-inch copper to 3/4-inch NPT adaptor to the side of the tee closest to the unit.

6. Install the drain valve on the tee opposite the adaptor.

7. Run interconnecting tubing from the tee to DHW water out.

8. Cut the cold water “IN” line going to the water heater.

9. Insert the reducing solder tee in line with cold water “IN” line as shown.

10. Run interconnecting copper tubing between the unit DHW water “IN” and the tee (1/2-inch nominal).

The recommended maximum distance is 50 feet.

11. To prevent air entrapment in the system, install a vent coupling at the highest point of the interconnecting lines.

12. Insulate all exposed surfaces of both connecting water lines with 3/8-inch wall closed cell insulation.

Note: All plumbing and piping connections must comply with local plumbing codes

Desuperheater Startup

1. Close the drain valve to the water heater.

2. Open the cold water supply to the tank.

3. Open a hot water faucet in the building to bleed air from the system. Close when full.

4. Open the pressure relief valve to bleed any remaining air from the tank, then close.

5. If so equipped, unscrew the indicator plug 1 turn on the motor end of the pump until all air is purged from the pump,

then tighten the plug. Use vent couplings to bleed air from the lines.

6. Carefully inspect all plumbing for water leaks and correct as required.

7. Before restoring electrical supply to the water heater, adjust the temperature setting on the tank.

• On tanks with both upper and lower elements, the lower element should be turned down to the lowest setting,

approximately 100°F. The upper element should be adjusted to 120°F to 130°F. Depending upon the specic

needs of the customer, you may want to adjust the upper element differently.

• On tanks with a single element, lower the thermostat setting to 120°F.

8. After the thermostat(s) is adjusted, replace the access cover and restore electrical supply to the water heater.

9. Make sure that any valves in the desuperheater water circulating circuit are open.

10. Turn on the unit to rst stage heating.

11. The DHW pump should be running. When the pump is rst started, open the inspection port 1 turn (if equipped) until

water dribbles out, then replace. Allow the pump to run for at least ve minutes to ensure that water has lled the

circulator properly. Be sure the switch for the DHW pump (SW4) is “ON”. The DHW “OFF” LED on the unit should not

be illuminated.

12. The temperature difference between the water entering and leaving the desuperheater should be 5°F to 15°F. The

water ow should be approximately 0.4 GPM per ton of nominal cooling.

13. Allow the unit to heat water for 15 to 20 minutes to be sure operation is normal.

CAUTION: Never operate the DHW circulating pump while dry. If the unit is placed in operation

before the desuperheater piping is connected, be sure that the pump switch is set to the OFF

position.

ENVISION SERIES INSTALLATION MANUAL

General

Be sure the available power is the same voltage and phase as that shown on the unit serial plate. Line and low voltage

wiring must be done in accordance with local codes or the National Electric Code, whichever is applicable. See unit electri-

cal data for fuse or cicuit breaker sizing information.

Electrical Data

Thermostat Wiring

Figure 12b: Thermostat Wiring for Dual Fuel Applications

Figure 12a: Thermostat Wiring, Single and Dual

Capacity Units

Electrical

Air Handler

Thermostat

24 VAC

Common Common

24 VAC

Reversing Valve

2nd Stage Compressor

1st Stage Compressor

Fan

Typical EZ Wiring Diagram

Air Handler transformer must be at least 75 VA.

Fault Signal

Envision Split

Fossil Fuel

Furnace

Thermostat

24 VAC

Common Common

24 VAC

Fault Signal

Reversing Valve

2nd Stage Compressor

1st Stage Compressor

Fan

Auxiliary Heat Relay

Note: Field installed DPST dual fuel relay

(Required for dual fuel installation)

Auxiliary Heat Relay

Shut

Down

= chassis

Envision Split

Auxiliary

Heat Relay

HWA Ext Total Min Max

Pump Loop Unit Circ Fuse/

MCC RLA LRA FLA FLA FLA Amp HACR

022 208-230/60/1 197/253 14.0 9.0 48.0 0.4 5.4 14.8 17.1 25

030 208-230/60/1 197/253 20.0 12.8 58.3 0.4 5.4 18.6 21.8 30

036 208-230/60/1 197/253 22.0 14.1 73.0 0.4 5.4 19.9 23.4 35

042 208-230/60/1 197/253 26.0 16.6 79.0 0.4 5.4 22.4 26.6 40

048 208-230/60/1 197/253 31.0 19.8 109.0 0.4 5.4 25.6 30.6 50

060 208-230/60/1 197/253 41.2 26.4 134.0 0.4 5.4 32.2 38.8 60

070 208-230/60/1 197/253 47.0 30.1 158.0 0.4 5.4 35.9 43.4 70

026 208-230/60/1 197/253 16.0 10.2 52.0 0.4 5.4 16.0 18.6 25

038 208-230/60/1 197/253 26.0 16.6 82.0 0.4 5.4 22.4 26.6 40

049 208-230/60/1 197/253 33.0 21.1 96.0 0.4 5.4 26.9 32.2 50

064 208-230/60/1 197/253 40.0 25.6 118.0 0.4 5.4 31.4 37.8 60

072 208-230/60/1 197/253 42.5 27.2 150.0 0.4 5.4 33.0 39.8 60

Notes:

Rated Voltage of 208-230/60/1. HACR circuit breaker in USA only. Min/Max Voltage of 197/253. All fuses Class RK-5.

Rev.: 02/20/07

Model

Rated

Voltage

Min/Max

Compressor

ENVISION SERIES INSTALLATION MANUAL

Wiring Schematics

Envision Series - Dual Capacity Split Wiring Schematic - 208-230/60/1

HWL

WCL

97P774-31 3/9/07

Status LED PCB

SW4

240V L2

240V L1

240V L2

Premier 2

Microprocessor

Logic Control

(DC Voltage)

Fused L2

CC-GND

CR2

COM

F1-10A 240V

Fused L2

CR1

COM

Pink

Black

Blue

Orange

Pink

Yellow

Down

Shut

SL1 In

Not

SL1 Out

Used

NOTE 1

Acc Com

Acc NC

Acc NO

1 2 3

Main Logic PCB

F1-10A

240V

Tan

SW1

ECM2

Air Flow

Settings

Black

Blue

CR4 COM

CR3 COM

CCHI

Not Used

SW3

SW2

No Htg3 / Htg3

Dehum / Norm

Fan / Comp

Loop / Well

Test / Norm

Outputs / Norm

Inputs / Norm

2 Speed / 1 Speed

Normal / Finish on 2

(Note 2)

No RPM / RPM

Electric Heat / Normal

Envision / E Series or Premier

Pulse L / Constant L (NOTE 4)

Field Selection Dips - #1 On, #6 On, #7 On

Drain pan overflow Lockout

FP thermistor (loop<15°F,well<30°F) Lockout

High Pressure > 600 PSI Lockout

Low Pressure < 40 PSI Lockout

ECM2 RPM < 100 rpm Lockout

Microprocessor malfunction*

HWL thermistor > 130°F

DHW pump switch off

Drain

Water Flow

High Press

Low Press / Comp

Air Flow

Status

DHW Limit

DHW off

LED Normal Display Mode

#1 Off, #6 On, #7 On

Drain pan overflow

FP thermistor (loop<15°F, well<30°F)

High Pressure > 600 PSI

Low Pressure < 40 PSI

ECM2 RPM < 100 rpm

Not Used

HWL thermistor > 130°F

DHW pump switch off

Current Fault Status

#6 Off, #7 On

SL1

SL2

Inputs

#6 On, #7 Off

Compressor Lo

Compressor Hi

FAN

DHW Pump

Loop Pump 1

Loop Pump 2

Outputs

#6 Off, #7 Off

Blower Lo

Blower M ed

Blower Hi

Aux Heat #1

Aux Heat #2

AuxHeat #3

Aux Heat #4

Outputs2

Diagnostic Modes

*Green LED not flashing

Thermistor

Light emitting diode - Green

Relay coil

Capacitor w/ bleed resistor

Switch - Condensate overflow

Switch - High pressure

Switch - Low pressure

Switch -Hot Water On/Off

Polarized connector

Factory Low voltage wiring

Factory Line voltage wiring

Field low voltage wiring

Field line voltage wiring

Optional block

DC Voltage PCB traces

Internal junction

Quick connect terminal

Wire nut

Field wire lug

Ground

Fuse

CC -

CO -

CR1 -

CR2-

CR3 -

CR4 -

F1 and F2 -

WCL -

HE -

HP -

LP -

PB1, PB2 -

PS -

RV -

SW1 -

SW2 -

SW3 -

SW4 -

TS -

Compressor Contactor

Condensate overflow sensor

DHW pump relay

Loop pump relay

Fuses

Water Coil Limit Sensor

Heater element

High pressure switch

Low pressure switch

Power blocks

Power strip

Reversing Valve coil

DIP package 12 position

DIP package 8 position

DIP package 5 position

Hot water pump enable switch

Thermal limit switch

Legend

Relay Contacts-

N.O., N.C.

132

PSC Fan Speed Relay

PSC Fan Power Relay

ER1 to ER4 - Aux heat stage relays

HWL -

Hot water limit sensor

SC -

Start Contactor

Start Relay

SR -

CS - Compressor Solenoid **DC Coil**

CA -

Comfort Alert

Fossil Fuel

Furnace

Thermostat

24 VAC

Common Common

24 VAC

Fault Signal

Reversing Valve

2nd Stage Compressor

1st Stage Compressor

Envision Sp lit

Fan

Auxiliary Heat Relay

Duel Fuel Wiring Diagram

Using Field Installed Relay

Note: Field installed DPST dual fuel relay

(Required for dual fuel installation)

Auxiliary Heat Relay

Shut

Auxiliary

Heat Relay

Down

= chassis

LED Flash Code Description

Green Solid Module Has Power

Red Solid Y1 Present But Compressor Not Running

Code 1 Long Run Time

Code 2 System Pressure Trip

Code 3 Short Cycling

Code 4 Locked Rotor

Code 5 Open Circuit

Code 6 Open Start Circuit

Code 7 Open Run Circuit

Code 8 Welded Contac tor

Code 9 Low Voltage

Yellow

Comfort Alert Status

NOT USED

NOTE 5

DHW

Pump

Blu

Fuse

Pink

Blu(17)

Ext Pump

1/2 hp Total

208-230/60/1

Pump Pump

PB1

Yel(8)

Pink(13)

Unit Power

208-230/60/1

L2 L1

Run

Capacitor

Red Black

Blue

Tan

(16)

Comfort Alert

Blk(1)

Violet(2)

Comfort

Alert

Violet(3)

Blk(5)

Yel(6)

Comfort Alert

NOTE 3

DC SOL

Wht(4)

Brn(15)

Org(14)

Gry(9)

NOTE 6

SL1 In

SL1 Out

Optional

Remote Unit

Without

Loop Pump

Notes:

1 - 24V Accessory relay (see SW2 - 3 for descr iption of operation)

4 – SW2-8 must be in the OFF position for pulsed “L” lockout signal and in the ON position for constant

“L” lockout signal.

2 – This Switch allows the unit to down stage with the t -stat when OF F and finish on second stage when

ON. Finish second stage reduces stage changing in recip dual capacity compressors and should

be ON for unzoned Dual Cap E -Series or Premier 2 speed units.

5 - DHW pump only in models with hot water generation option .

6 - Connection of remote unit that does not have a loop pump for slave operation .

3 - Comfort Alert fault output to Premier Control Board

ENVISION SERIES INSTALLATION MANUAL

Wiring Schematics

Envision Series - Single Speed Split Wiring Schematic - 208-230/60/1

HWL

WCL

97P774-30 3/9/07

Status LED PCB

SW4

240V L2

240V L1

240V L2

Premier 2

Microprocessor

Logic Control

(DC Voltage)

Fused L2

CC-GND

CR2

COM

F1-10A 240V

Fused L2

CR1

COM

Pink

Black

Blue

Orange

Pink

Yellow

Down

Shut

SL1 In

Not

SL1 Out

Used

NOTE 1

Acc Com

Acc NC

Acc NO

1 2 3

Main Logic PCB

F1-10A

240V

Tan

SW1

ECM2

Air Flow

Settings

Black

Blue

CR4 COM

CR3 COM

CCHI

Not Used

SW3

SW2

No Htg3 / Htg3

Dehum / Norm

Fan / Comp

Loop / Well

Test / Norm

Outputs / Norm

Inputs / Norm

2 Speed / 1 Speed

Normal / Finish on 2

(Note 2)

No RPM / RPM

Electric Heat / Normal

Envision / E Series or Premier

Pulse L / Constant L (NOTE 4)

Field Selection Dips - #1 On, #6 On, #7 On

Drain pan overflow Lockout

FP thermistor (loop<15°F,well<30°F) Lockout

High Pressure > 600 PSI Lockout

Low Pressure < 40 PSI Lockout

ECM2 RPM < 100 rpm Lockout

Microprocessor malfunction*

HWL thermistor > 130°F

DHW pump switch off

Drain

Water Flow

High Press

Low Press / Comp

Air Flow

Status

DHW Limit

DHW off

LED Normal Display Mode

#1 Off, #6 On, #7 On

Drain pan overflow

FP thermistor (loop<15°F, well<30°F)

High Pressure > 600 PSI

Low Pressure < 40 PSI

ECM2 RPM < 100 rpm

Not Used

HWL thermistor > 130°F

DHW pump switch off

Current Fault Status

#6 Off, #7 On

SL1

SL2

Inputs

#6 On, #7 Off

Compressor Lo

Compressor Hi

FAN

DHW Pump

Loop Pump 1

Loop Pump 2

Outputs

#6 Off, #7 Off

Blower Lo

Blower M ed

Blower Hi

Aux Heat #1

Aux Heat #2

AuxHeat #3

Aux Heat #4

Outputs2

Diagnostic Modes

*Green LED not flashing

Notes:

1 - 24V Accessory relay (see SW2 - 3 for description of operation)

4 – SW2-8 must be in the OFF position for pulsed “L” lockout signal and in the ON position for constant

“L” lockout signal.

2 – This Switch allows the unit to down stage with the t -stat when OFF and finish on second stage when

ON. Finish second stage reduces stage changing in recip dual capacity compressors and should

be ON for unzoned Dual Cap E -Series or Premier 2 speed units.

Thermistor

Light emitting diode - Green

Relay coil

Capacitor w/ bleed resistor

Switch - Condensate overflow

Switch - High pressure

Switch - Low pressure

Switch -Hot Water On/Off

Polarized connector

Factory Low voltage wiring

Factory Line voltage wiring

Field low voltage wiring

Field line voltage wiring

Optional block

DC Voltage PCB traces

Internal junction

Quick connect terminal

Wire nut

Field wire lug

Ground

Fuse

CC -

CO -

CR1 -

CR2-

CR3 -

CR4 -

F1 and F2 -

WCL -

HE -

HP -

LP -

PB1, PB2 -

PS -

RV -

SW1 -

SW2 -

SW3 -

SW4 -

TS -

Compressor Contactor

Condensate overflow sensor

DHW pump relay

Loop pump relay

Fuses

Water Coil Limit Sensor

Heater element

High pressure switch

Low pressure switch

Power blocks

Power strip

Reversing Valve coil

DIP package 12 position

DIP package 8 position

DIP package 5 position

Hot water pump enable switch

Thermal limit switch

Legend

Relay Contacts-

N.O., N.C.

132

PSC Fan Speed Relay

PSC Fan Power Relay

ER1 to ER4 - Aux heat stage relays

HWL -

Hot water limit sensor

SC -

Start Contactor

Start Relay

SR -

CS - Compressor Solenoid **DC Coil**

CA -

Comfort Alert

Fossil Fuel

Furnace

Thermostat

24 VAC

Common Common

24 VAC

Fault Signal

Reversing Valve

2nd Stage Compressor

1st Stage Compressor

EZ Split

Fan

Auxiliary Heat Relay

Duel Fuel Wiring Diagram

Using Field Installed Relay

Note: Field installed D PST dual fuel relay

(Required for dual fuel installation)

Auxiliary Heat Relay

Shut

Auxiliary

Heat Relay

Down

= chassis

LED Flash Code Description

Green Solid Module Has Power

Red Solid Y1 Present But Compressor Not Running

Code 1 Long Run Time

Code 2 System Pressure Trip

Code 3 Short Cycling

Code 4 Locked Rotor

Code 5 Open Circuit

Code 6 Open Start Circuit

Code 7 Open Run Circuit

Code 8 Welded Contactor

Code 9 Low Voltage

Yellow

Comfort Alert Status

NOT U

5 - DHW pump only in models with hot water generation option .

NOTE 5

DHW

Pump

Blu

Fuse

Pink

Blu(17)

Ext Pump

1/2 hp Total

208-230/60/1

Pump Pump

PB1

Yel(8)

Pink(13)

Unit Power

208-230/60/1

L2 L1

Run

Capacitor

Red Black

Blue

Tan

(16)

Comfort Alert

Blk(1)

Violet(2)

Comfort

Alert

Violet(3)

Blk(5)

Yel(6)

Comfort Alert

NOTE 3

Brn(15)

Org(14)

Gry(9)

NOTE 6

SL1 In

SL1 Out

Optional

Remote Unit

Without

Loop Pump

6 - Connection of remote unit that does not have a loop pump for slave operation .

3 - Comfort Alert fault output to Premier Control Board

ENVISION SERIES INSTALLATION MANUAL

Startup

The unit will not operate until all the inputs and safety controls

are checked for normal conditions. At rst power-up, a four-minute

delay is employed before the compressor is energized.

Component Sequencing Delays

Components are sequenced and delayed for optimum space

conditioning performance.

Accessory Relay

An accessory relay on the control board allows for eld

connection of solenoid valves, electronic air cleaners, etc. The

accessory relay has a normally open output and a normally closed

output.

Short Cycle Protection

The control employs a minimum "off" time of four minutes to

provide for short cycle protection of the compressor.

Shutdown Mode

A 24VAC common signal to the “shutdown” input on the control

board puts the unit into shutdown mode. Compressor, hot water

pump and fan operation are suspended.

Safety Controls

The Envision control receives separate signals for a high

pressure switch for safety, a low pressure switch to prevent loss

of charge damage, and a low suction temperature thermistor for

freeze sensing. Upon a continuous 30-second measurement of

the fault (immediate for high pressure), compressor operation is

suspended, the appropriate lockout LED begins ashing. (Refer to

the "Fault Retry" section below.)

Testing

The Envision control allows service personnel to shorten most

timing delays for faster diagnostics. (Refer to the Field Selection

DIP switch SW2-1 on page 21.)

Fault Retry

All faults are retried twice before nally locking the unit out. An

output signal is made available for a fault LED at the thermostat.

The “fault retry” feature is designed to prevent nuisance service

calls.

Diagnostics

The Envision control board allows all inputs and outputs to be

displayed on the LEDs for fast and simple control board diagnosis.

(Refer to the Field Selection DIP Switch SW2-1 on page 21.)

Hot Water High Limit

(Domestic Hot Water Option)

This mode occurs when the hot water input temperature is at

or above 130°F for 30 continuous seconds. The DHW limit status

LED on the unit illuminates and the hot water pump de-energizes.

Hot water pump operations resume on the next compressor cycle

or after 15 minutes of continuous compressor operation during the

current thermostat demand cycle.

Hot Water Justication

Since compressor hot gas temperature is dependant on loop

temperature in cooling mode, loop temperatures may be too low

to allow proper heating of water. The control will monitor water and

refrigerant temperatures to determine if conditions are satisfactory

for heating water. The DHW limit status LED on the unit illuminates

when conditions are not favorable for heating water.

Heating Operation

Heat, 1st Stage (Y1)

The fan motor is started on low speed immediately (PSC

ON), the loop pump is energized 5 seconds after the “Y1” input

is received, and the compressor is energized on low capacity 10

seconds after the “Y1” input. The fan is switched to medium speed

15 seconds after “Y1” input (ECM only). The hot water pump is

cycled 30 seconds after the "Y1" input.

Heat, 2nd Stage (Y1,Y2) Single-Speed Units

The hot water pump is de-energized, which directs all heat

to satisfying the thermostat, and the fan changes to high speed

15 seconds after the "Y2" input (ECM only).

Heat, 2nd Stage (Y1,Y2) Dual Capacity Units

The second stage compressor will be activated 5 seconds

after receiving a “Y2” input as long as the minimum rst stage

compressor run time of 1 minute has expired. The ECM blower

changes from medium to high speed 15 seconds after the “Y2” input.

The Comfort Alert will delay the second stage compressor

until 5 seconds after it receives a “Y2” from the board.

Heat, 3rd Stage (Y1,Y2,W) Single-Speed Units

The rst stage of resistance heat is energized 10 seconds

after “W” input, and with continuous 3rd stage demand, the

additional stages of resistance heat engage sequentially

every 5 minutes.

Heat, 3rd Stage (Y1,Y2,W) Dual Capacity Units

The hot water pump is de-energized which directs all heat

to satisfy the thermostat. The 1st stage of resistance heat is

energized 10 seconds after “W” input, and with continuous 3rd

stage demand, the additional stages of resistance heat engage

sequentially every 5 minutes.

Emergency Heat (W only)

The fan is started on high speed, and the rst stage of

resistance heat is energized 10 seconds after the "W" input.

Continuing demand will engage the additional stages of

resistance heat sequentially every 2 minutes.

Microprocessor Control

ENVISION SERIES INSTALLATION MANUAL

Cooling Operation

In all cooling operations, the reversing valve directly

tracks the “O” input. Thus, anytime the “O” input is present,

the reversing valve will be energized.

Cool, 1st Stage (Y1,O)

The blower motor and hot water pump are started immediately,

the loop pump(s) is energized 5 seconds after the “Y1” input is

received. The compressor will be energized (on low capacity for

Dual Capacity units) 10 seconds after the “Y1” input. The ECM

blower will shift from low to medium speed 15 seconds after the

“Y1” input (85% of medium speed if in dehumidication mode).

Cool, 2nd Stage (Y1, Y2, O) Single Speed Units

The fan changes to high speed (85% of high speed if in

dehumidication mode) 15 seconds after the “Y2” input (ECM only).

Cool, 2nd Stage (Y1, Y2, O) Dual Capacity Units

The second stage compressor will be activated 5 seconds

after receiving a “Y2” input as long as the minimum rst stage

compressor run time of 1 minute has expired. The ECM blower

changes to high speed 15 seconds after the “Y2” input (85% of

high speed if in dehumidication mode). The Comfort Alert will

delay the second stage compressor until 5 seconds after it

receives a “Y2” from the board.

Fan (G only)

The fan starts on low speed (PSC ON). Regardless of fan

input “G” from thermostat, the fan will remain on low speed for 30

seconds at the end of each heating, cooling or emergency heat

cycle.

Lockout Conditions

During lockout mode, the appropriate unit and thermostat

lockout LEDs will illuminate. The compressor, loop pump, hot

water pump, and accessory outputs are de-energized. The fan will

continue to run on low speed. If the thermostat calls for heating,

emergency heat operation will occur.

Comfort Alert lockouts cannot be reset at the thermostat.

All other lockout modes can be reset at the thermostat after

turning the unit off, then on, which restores normal operation but

keeps the unit lockout LED illuminated. Interruption of power to

the unit will reset a lockout without a waiting period and clear all

lockout LEDs.

High Pressure

This lockout mode occurs when the normally closed safety

switch is opened momentarily (set at 600 PSI).

Low Pressure

This lockout mode occurs when the normally closed low

pressure switch is opened for 30 continuous seconds (set at 40 PSI).

A low pressure fault may also be indicated when a Comfort Alert

lockout has occurred.

Freeze Sensing (Water Flow)

This lockout mode occurs when the freeze thermistor

temperature is at or below the selected freeze point (well 30°F or

loop 15°F) for 30 continuous seconds.

Microprocessor Control (cont.)

ENVISION SERIES INSTALLATION MANUAL

OPERATION LOGIC

HEATING COOLING

FAN ON

SL1 - IN

SL2 - IN

STG1 STG2 STG3 EMERG STG1 STG2

SINGLE SPEED UNITS

Compressor On On On Off On On - - -

Rev Valve Off Off Off Off On On - - -

Loop Pump On On On Off On On - On -

DHW Pump On Off Off Off On On - - -

Secondary 1- Out On On On Off On On - - -

Emerg LED Off Off Off On Off Off Off - -

T-Stat Signal Y1 Y1, Y2 Y1, Y2, W W Y1, O Y1, Y2, O G - -

DUAL CAPACITY UNITS

Compressor-Lo On Off Off Off On Off - - -

Compressor-Hi Off On On Off Off On - - -

Rev Valve Off Off Off Off On On - - -

Loop Pump On On On Off On On - On -

DHW Pump On On Off Off On On - - -

Secondary 1- Out On On On Off On On - - -

Secondary 2- Out Off On On Off Off On - - -

Emerg LED Off Off Off On Off Off - - -

T-Stat Signal Y1 Y1, Y2 Y1, Y2, W W Y1, O Y1, Y2, O G - -

Operation Logic Data

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Envision Geothermal Indoor Split Heat Pumps User manual

Brand: Envision

Model: Geothermal Indoor Split Heat Pumps

Category: Heat pumps

Type: User manual

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Envision Geothermal Indoor Split Heat Pumps User manual

Envision Geothermal Indoor Split Heat Pumps User manual

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