Envision R-410A Residential Installation guide

Brand: Envision

Model: R-410A Residential

Category: Split-system air conditioners

Type: Installation guide

WaterFurnace

IM1615 10/08

Installation Information

Water Piping Connections

Electrical

Startup Procedures

Troubleshooting

Preventive Maintenance

Envision Series Outdoor Split Installation Manual

Geothermal/Water Source Outdoor Split Heat Pumps

 • R-410ARefrigerant

 • 2,3,4,5,6TonDualCapacity

™

NS SPLIT INSTALLATION MANUAL

Table of Contents

Nomenclature 2

PhysicalCharacteristics 2

GeneralInstallationInformation 3-6

ElectricalData 7

WaterPiping 8

AirHandlerNomenclature&CoilData 9

LineSetSizing 9

PhysicalData 10

EnvisionCoilNomenclature 11

RefrigerantCoilCompatability 11

HeatRecoveryUnit 12

WiringSchematics 13

ModesofOperation 14

OperationLogic 15

DIPSwitchSettings 16

Refrigeration 17-19

Pressure/TemperatureConversionChart 20

UnitOperatingParameters 21

PressureDropandRecommendedFlowRates 22

UnitStartup&Troubleshooting 23-26

PreventiveMaintenance 27

ReplacementProcedures 27

PhysicalDimensions 28

NS SPLIT INSTALLATION MANUAL

Model Nomenclature

1 2 3 4-6 7 8 9 10 11

N D S 049 A 1 0 A C

Model Type

N = Envision Coax Options

C = Copper

Compressor Type N = Cupronickel

D = Dual Capacity

Future Option

Cabinet Configuration A =

S = Outdoor Split

Hot Water Option

Unit Capacity 0 = None

Vintage Voltage

A = Current 1 = 208-230/60/1

Physical Characteristics

Model 026 038 049 064 72

Compressor (1 each)

Factory Charge R410a, oz [kg]

[1.47]

[1.59]

[2.55]

[2.61]

104

[2.95]

Coax and Water Piping

Coax & Piping Water Volume - gal [l]

0.7

[2.6]

1.3

[4.9]

1.6

[6.1]

1.6

[6.1]

2.3

[8.7]

Weight - Operating, lb [kg]

189

[186]

236

[107]

250

[113]

271

[123]

290

[132]

Weight - Packaged, lb [kg]

209

[95]

256

[116]

270

[122]

291

[132]

310

[141]

4/9/08

Notes:

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

Dual Capacity Scroll

NS SPLIT 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.

Split Unit Location

Locate the split compressor section away from areas that may disturb the customer and in a way that allows easy re-

moval of the access panels and the top of the cabinet. Provide sufcient room to make water, electrical and refrigerant line

connections and allow space for service personnel to perform maintenance. The NS split is approved for outdoor installa-

tion when properly installed.

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

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

switchestobothunits.Turnoffaccessoryheaterpowerswitchifapplicable.Electricalshock

couldcausepersonalinjury.Installingandservicingheatingandairconditioningequipmentcan

behazardousduetosystempressureandelectricalcomponents.Onlytrainedandqualiedser-

vicepersonnelshouldinstall,repairorserviceheatingandairconditioningequipment.

Safety Considerations

General Installation Information

NS SPLIT INSTALLATION MANUAL

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

is too 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.•

Match the air handler to the air handler coil data table.•

Indoor matching adjustable TXV is factory installed on every 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 bene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 (cont.)

NS SPLIT INSTALLATION MANUAL

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.

Figure 1: Typical Split System Application - Remote Blower Coil

General Installation Information (cont.)

Lineset

To Air Handler

Insulated

Suction Line

Return

Duct

Low

Voltage Wire

Disconnect

Remote Air Handler

(Maximum Recommended Distance is

60' Between Units)

Condensate Drain

(must be trapped)

Supply

Duct

Air

Handler

NS SPLIT 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 13 for details.

Thermostat

Wire From Furnace

Wire To

Thermostat

Up-Flow

Fossil Fuel

Furnace

Condensate

Drain

(must be trapped)

"A" or

Slab Coil

Supply Duct

Insulated

Suction Line

Return

Duct

Lineset To Air Handler

Disconnect

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

General Installation Information (cont.)

NS SPLIT INSTALLATION MANUAL

Rated Voltage

HWA Ext Total Min Max

Model Voltage Min/Max

Pump Loop Unit Circ Fuse/

MCC RLA LRA FLA FLA FLA Amp HACR

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

Rated Voltage of 208-230/60/1.

Rev.: 02/20/07

HACR circuit breaker in USA only.

Min/Max Voltage of 197/253.

All fuses Class RK-5.

Compressor

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 3b: Thermostat Wiring for Dual Fuel Applications

Figure 3a: Thermostat Wiring

Electrical

Air Handler

Thermostat

24 VA C

Common Common

24 VA C

Reversing Valve

2nd Stage Compressor

1st Stage Compressor

Fan

Ty pical 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

NS SPLIT INSTALLATION MANUAL

Water Piping

Residential NS split units are supplied standard with GeoLink swivel connections with P.T. ports.

CAUTION:Waterpipingexposedtooutsidetemperaturesmaybesubjecttofreezing.

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 determine 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.

Closed Loop - Earth coupled Systems (Outdoor Installations)

Locate unit on an air pad with access hole as shown below. When mounting on an existing concrete pad, holes must

be bored through to accommodate 1 1/4-inch P.E. pipe with 1/2-inch insulation.

Connecting To Earth Loop

The earth loop trench should be continued directly under the unit as shown in Figure 4. Make the connections to op-

tional ttings from the loop circulator pump(s) and insure proper backll to support the loop pipe during trench settling. All 1

1/4-inch piping should be insulated with a minimum of 1/2-inch closed cell insulation from below the ground surface to the

loop circulator.

IMPORTANT

- Afreezesensingthermostatisinstalledintheunittoautomaticallystartloopcirculator

pumpiflooptemperaturedropsbelow20°F.Loopfreezesensingshouldalsobemaintainedtothe

lowesttemperaturetheinsulatedloopmayencounterinthecaseofpowerfailure.

Flow Center Installation

Flow centers FC1-GL or FC2-GL, as needed, may be

internally mounted on the NDS splits, Two stub tubes with

barbs are pre connected to the coax. Two tubes with brass

ttings, to adapt to the ow center, 2 hoses to connect

between the two sets of tubes, and four hose clamps are in-

cluded with each NDS unit. The brass adapter ttings have

plastic swivel connectors and are also internally threaded to

accept 1” NPT ttings.

NOTE: For ease of installation, attach provided hoses to

coax rst and then trim to t to elbows on ow center.

Loop Supply

and Return

Piping

Figure 4: Typical Split System Outdoor Installation Using

Closed Loop

NS SPLIT INSTALLATION MANUAL

Air Handler Coil Data

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.)

NDS026 NAH026 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 52

NDS038 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56

NDS049 NAH048 3/4" OD 3/8" OD 7/8" OD 3/8" OD 7/8" OD 1/2" OD 90

NDS064 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 92

NDS072 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.: 4/1/08

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

20 feet 40 feet 60 feet

Air Handler Nomenclature

NAH 036 A 00 0 1 R

Model Type Air Coil

NAH = Envision Air Handler R = Refrigerant

H = Hydronic

Unit Capacity

Refrigerant Models Nom. CFM Motor

022 MBTUH 800 1 = ECM 208-230/60/1

026 MBTUH 925

030 MBTUH 980

036 MBTUH 1225

042 MBTUH 1425 Disconnect

048 MBTUH 1625 0 = No breaker installed (only on 5kW & 10 kW heaters )

060 MBTUH 1760 1 = Breaker installed (only on 15kW & 20kW heaters)

Hydronic Models

026 MBTUH 925

036 MBTUH 1225 Electric Heat

048 MBTUH 1625 00 = No electric heat

060 MBTUH 1760 05 = 5 kW (available on 022-036)

10 = 10 kW (available on 030-060)

Vintage

Note: Kit NAHBC must be ordered to field convert the NAH042-060 to bottomflow air discharge

15 = 15 kW (available on 042-060)

A = Current 20 = 20 kW (available on 060 only)

NS SPLIT INSTALLATION MANUAL

NAH022 NAH026 NAH030 NAH036 NAH042 NAH048 NAH060

Air Coil Total Face Area, ft2 [m2]

Tube outside diameter - in. [mm]

Number of rows

Fins per inch

Suction line connection - in. [mm] sweat

Liquid line connection - in. [mm] sweat

Nominal cooling capacity - tons [kW] 1.8 [6.44] 2.1 [7.59] 2.5 [8.79] 3 [10.55] 3.5 [12.30] 4 [14.06] 5 [17.58]

Condensate drain connection - (FPT) in. [mm]

Blower Wheel Size (Dia x W), in. [mm]

Blower motor type/speeds

Blower motor output - hp [W]

Filter Standard - 1" [51mm] MERV3 disposable, in. [mm]

Electrical characteristics (60hz)

Shipping weight - lbs. [kg]

Operating weight - lbs. [kg]

1/11/08

NAH026 NAH036 NAH048 NAH060

Air Coil Total Face Area, ft2 [m2]

Tube outside diameter - in. [mm]

Number of rows

Fins per inch

Water In connection - in. [mm] sweat

Water Out connection - in. [mm] sweat

Nominal cooling capacity - tons [kW] 2.1 [7.59] 3 [10.55] 4 [14.06] 5 [17.58]

Condensate drain connection - (FPT) in. [mm]

Blower Wheel Size (Dia x W), in. [mm]

Blower motor type/speeds

Blower motor output - hp [W]

Filter Standard - 1" [51mm] MERV3 disposable, in. [mm]

Electrical characteristics (60hz)

Shipping weight - lbs. [kg]

Operating weight - lbs. [kg]

3/11/08

220 [99.79]

200 [90.71]

208/230 - 1ph

ECM variable speed

1/2 [373] 1 [746]

20 x 24 [508 x 635]

3/4 [19.05]

11 x 10 [279 x 254]

Air Handler Model Number (Hydronic)

Hydronic

Coil

7/8 [22.22]

6.94 [0.64]

3/8 [9.52]

Air Handler Model Number (Refrigerant)

Evaporator

Coil

5.83 [0.54]

3/8 [9.52]

2 3

5/8 [15.87] 7/8 [22.22]

3/8 [9.52]

Refrigerant R-410a

3/4 [19.05]

11 x 10 [279 x 254]

ECM variable speed

1/2 [373] 1 [746]

20 x 24 [508 x 635]

208/230 - 1ph

215 [97.52] 220 [99.79]

195 [88.45] 200 [90.71]

NOTE: Water connection dimensions are O.D.

Physical Data

NS SPLIT INSTALLATION MANUAL

NR A C 026 C

Cabinet

Model Type

C = Encased

NR = Envision Refrigerant Coil

U = Uncased

NH = Envision Hydronic Coil

Capacity

Configuration Refrigerant Models

A = "A" Coil 026 MBTUH

036 MBTUH

048 MBTUH

Coil 060 MBTUH

Hydronic Models

060 MBTUH

Note: All Refrigerant Coils include TXV. The encased coil cabinet is designed for upflow applications.

Encased/Uncased Coil

Indoor Split Model

(Single)

Indoor Split Model

(Dual Capacity)

Outdoor Split Model

(Dual Capacity)

Recommended

Airow (CFM)

NRAC026* NSZ022 - 800

NRAC026* - NDZ026 NDS026 925

NRAC026* NSZ030 - - 980

NRAC036* NSZ036 - - 1225

NRAC036* - NDZ038 NDS038 1225

NRAC048* NSZ042 - - 1425

NRAC048* NSZ048 - - 1625

NRAC048* - NDZ049 NDS049 1625

NRAC060* NSZ060 - - 1760

NRAC060* - NDZ064 NDS064 1760

NRAC060* NSZ070 - - 1760

NRAC060* - NDZ072 NDS072 1760

7/14/08

Envision Coil Nomenclature

Refrigerant Coil Compatibility

NS SPLIT INSTALLATION MANUAL

Service valves have been provided inside the unit for connecting the discharge gas line to a water heating heat recov-

ery unit (see gure 5). To make the connections, close the service valves inside the unit by turning clockwise. Using a

recovery canister connect to either of the schrader ports on the DSH service valves and recover the small amount of refrig-

erant trapped inside of the U-tube. PriortobrazingensurethatallrefrigeranthasbeenremovedfromU-tube. Once

the refrigerant is removed, it is recommended that the tube be cut at the “U” to remove any excess oil that may be trapped.

(This will also allow for easier removal of the tubing with a torch, since each section can be removed independently). Ser-

vicevalvesmustbeprotectedtopreventoverheating. Unbraze the 1/2-inch O.D. U-tube and run tubing from the left

hand service valve to the inlet of the heat recovery unit and from the outlet of the heat recovery unit to the right hand of the

service valve. Typically the one way discharge line length should be limited to 25-30 feet and line size must be increased

depending on unit size and length of run. Follow the instructions supplied with the heat recovery unit for mounting location,

water piping, and start up. A typical installation is shown below.

IMPORTANT-Reopendischargelineservicevalvesbeforestartingupunit,butonlyafterleakchecking,

purging,andevacuatingnewdischargeline.

Compressor

Heat Recovery

Unit “In”

From

Heat Recovery

Unit “Out” to

Reversing

Valve

Insulated Line set

With UV Paint

To Air handler

Add-on

Hot Water

Generator with

Internal Pump

Cold

Drain Valve

Pipe Tee

Hot

Venting

Waste Valve or

Vent Coupling

Line set

To Hot Water

Generator

P/T Relief

Valve

Figure 5: Service Valves for Heat Recovery Unit Connections

Figure 6: Typical Hot Water Piping Layout

SIZE 1/2”OD 5/8”OD 3/4”OD

026-038 Up to 9 ft. Up to 25 ft. Up to 30 ft.

049 Up to 5 ft. Up to 13 ft. Up to 30 ft.

064 N/A Up to 9 ft. Up to 25 ft.

072 N/A Up to 6 ft. Up to 20 ft.

Maximum One-Way Line Length

Heat Recovery Unit for Domestic Hot Water

NS SPLIT INSTALLATION MANUAL

Wiring Schematics

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

Fused L2

240V L1

240V L2

Microprocessor

Logic Control

(DC Voltage)

Fused L2

CC-GND

CR2

COM

NO NC

CR4

COM

F1-10A 240V

CR1

COM

Down

Shut

SL1 I n

Not

SL1 Out

Used

NOTE 2

Acc Com

Acc NC

Acc NO

1 2 3

NO NC

CR3

COM

F1-10A 240V

SW1

SW3

SW2

8 Pulse L / Constant L

Not Used

Fan / Comp

Loop / Well

Test / Norm

Outputs / Norm

Inputs / Norm

Dual/ Single Capacity

Normal/Finish on 2

No RPM / RPM

Must be On

Envision / E Series or Premier

ECM2

Air Flow

Settings

Status LED PCB

SW4

NOTE 1

SL1 I n

SL1 Out

Optional

Remote Unit

Without

Loop Pump

NOT USED

CCHI

Fused L1

Black (7)

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

Not Used

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

High Pressure

Low Pressure / Comfort Alert

Not Used

Microprocessor malfunction*

Not Used

Drain

Water Flow

High Press

Low Press/ CA

Air Flow

Status

DHW Limit

DHW off

LED Normal Display Mode

#1 Off, #6 On, #7 On

Not Used

FP thermistor (loop<15°F, well<30°F)

High Pressure

Low Pressure / Comfort Alert

Not Used

Current Fault Status

#6 Off, #7 On

Not Used

SL1

SL2

Inputs

#6 On, #7 Off

Lo Capacity Compressor

FAN

Not Used

Loop Pump 1

Outputs

#6 Off, #7 Off

Not Used

Outputs2

Diagnostic Modes

*Green LED not flashing

Hi Capacity Compressor

Loop Pump 2

Not Used

Not UsedNot UsedNot Used

Tan

Orange

Not Used

Yellow

Blue

Black

Comfort Alert

NO TE 5

Comfort

Alert

Unit Power

208-230/60/1

L2 L1

Comfort Alert

Red Black

Blue

DC SOL

Run

Capacitor

NOTE 6

Y 2

Sol

Data

Port

Comfort Alert

Physical Layout

POWER

ALERT

TRIP

Envision Logic Board - Physical Layout

1 2 3

OnOff

SW1

240V - L2

240V - L1

Fused L2

Microprocessor

Premier 2 Logic Board

CR2- Loop

Pump

N.O.

240V - L2

240V - L1

Fused L2

Fused L1

CR1- DHW

Pump

N.O .

CC-GND

CCLO

CCHI

1 2 3

OnOff

SW2

OnOff

SW3

1 2 3 4 5 6 7 8

3 4 5

6 71

R C Y1 Y2 GOW L

Shut

Down

ACC

COM

C C

SL1

SL 1

Out

SL 2

Out

N.O.

CR4-

Com

N.O.

CR3-

Com

N.C.

Heat

Recovery

Unit

Pump

Loop Pump(s)

1/2 HP 208-230/60/1

Pump

Thermistor

Light Emitting Diode - Green

Relay Coil

Capacitor w/ Bleed Resistor

Switch - High Pressure

Switch - Low Pressure

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 -

CR1 -

CR2-

CR3 -

CR4 -

F1 and F2 -

FP -

HP -

LP -

RV -

SW1 -

SW2 -

SW3 -

Compressor Contactor

Loop Pump Relay 1

Fuses

Freeze protection sensor

High Pressure Switch

Low Pressure Switch

Reversing Valve Coil

Not Used

DIP Package 8 Position

DIP Package 5 Position

Relay Contacts-

N.O., N.C.

Loop Pump Relay 2

Not Used

CS -

Compressor Solenoid

Not Used

Legend

Notes

Yellow (8)

Gray (9)

Violet (10)

Black (1)

Violet (2)

Violet (3)

White (4)

Black (5)

Yellow (6)

Orange (14 )

Brown (15)

Tan (16)

Red (11)

Red (12)

Black Black

Green/Yellow

Crankcase Heater

Not Used

CA -

Comfort Alert

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

24V Accessory relay (see SW 2-3 for description of operation)

Field installed DPDT dual fuel relay (Required for dual fuel installation)

DHW pump only in models with hot water generation option

Comfort Alert fault output to Premier Control Board

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

1 -

2 -

3 -

4 -

5 -

6 -

NS SPLIT INSTALLATION MANUAL

Heating Operation

Note: At rst power up, a four-minute time delay is employed before the compressor is energized.

Heat,1stStage(Y1)

The compressor and loop pumps are energized 10 seconds after the Y1 input.

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 Comfort Alert will delay the second stage compressor until 5 seconds after it receives “Y2” from the board.

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 compressor and loop pumps are energized 10 seconds after the Y1 input.

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 Comfort Alert will delay the second stage compressor until 5 seconds after it receives a “Y2” from the board.

Fan Only Operation

The Fan Only mode is controlled directly from the unit thermostat to the unit air handler. No input is given to the micro-

processor to operate the fan function.

Lockout Conditions

During lockout mode, the appropriate thermostat lockout LEDs (if available) will illuminate. The compressor and loop

pumps are de-energized and if the thermostat calls for third stage heating, emergency heat operation will occur.

Lockout modes of any kind can be reset at the thermostat after a 5-second waiting period, which restores normal

operation.

High Pressure

This lockout mode occurs immediately when the normally closed safety switch is momentarily opened.

Low Pressure

This lockout mode occurs when the normally closed switch is opened for 30 continuous seconds.

Freeze Sensing (Water Flow)

This lockout mode occurs when the freeze sensing thermistor temperature (located between the TXV and coax) is at or

below the selected freeze sensing point (well 30°F or loop 15°F) for 30 continuous seconds.

The unit also contains a secondary freeze sensing sensor located on the entering water line of the unit. If the loop

reaches a temperature of 20°F the secondary freeze sensing sensor will cycle the loop pumps "on" until the loop tempera-

ture rises to or above 25°F.

Modes of Operation

NS SPLIT INSTALLATION MANUAL

Operation Logic Data

OPERATIONLOGIC

HEATING COOLING

SL1-INON

STG1 STG2 STG3 EMERG STG1 STG2

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 Pumps

On On On Off On 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 -

NS SPLIT INSTALLATION MANUAL

DIP Switch Settings

DIPSWITCH

NUMBER

DESCRIPTION OFFPOSITION ONPOSITION

SW1 N/A NOTUSED N/A N/A

SW2

Service/TestMode-Allows control of “NORM” or “TEST” opera-

tional modes. Test mode accelerates most timing functions 16

times to allow faster troubleshooting. Test mode also allows view-

ing the “CURRENT” status of the fault inputs on the LED display.

Test Norm

FreezeSensingSetting

Allows eld selection of freeze thermistor fault sensing tempera-

tures for well water (30°F) or antifreeze-protected (15°F) earth

loops.

Loop

(Sensing 15° F)

Well

(Sensing 30° F)

AccessoryRelay

Allows eld selection of the accessory relay to operate with the

compressor or fan.

Fan Comp

4 NOT USED N/A N/A

5 NOT USED N/A N/A

InputDiagnostics-Allows viewing the inputs from the thermo-

stat to the control board such as Y1, Y2, O, G, W, SL1-In on the

LED display.

Diagnostic Inputs

viewed at LEDs

Normal Display

viewed at LEDs

OutputDiagnostics-Allows viewing the outputs from the control

board such as the compressor, reversing valve, blower, hot water

pump, and loop pump on the LED display.

Diagnostic

Outputs viewed at

LEDs

Normal

Display viewed

at LEDs

ThermostatSelection

Congures the control for a pulsed lockout signal (ComforTalk and

FaultFlash thermostats) or continuous 5 VAC lockout signal.

Pulsed “L”

signal

Continuous “L”

signal

SW3

1 Single or Dual Capacity Operation Dual Cap 1 Speed

Zoned/FinishonSecondStage

This switch allows the unit to down stage with the thermostat

when off and nish with second stage when on. Finish on second

stage reduces stage changing in reciprocating dual capacity

compressors.

Normal -

All other systems

Finish on 2nd

Unzoned Dual

Capacity

E-Series or

Premier 2 speed

3 ECM Fan Monitoring - Set for No PRM on split systems No RPM RPM

4 NOT USED N/A N/A

On dual capacity units this switch allows stage change: on the y

when off, and 1 minute delay when on. A delay is required on all

reciprocating dual capacity units.

Envision

E-Series or

Premier

NS SPLIT INSTALLATION MANUAL

The Envision series comes with a holding charge. The charge must be adjusted in the eld based on performance.

Refrigeration piping on the split consists of installing a brazed copper line set between the blower coil unit and the unit’s split

compressor section. To select the proper tube diameters for the installation, refer to the table on page 9. Line sets over 60

feet long are not recommended because of oil return and pressure drop problems. The suction line must always be insu-

lated. Handle and route the line sets carefully to avoid kinking or bending the tubes. If the line set is kinked or distorted and

it cannot be formed back into its original shape, the bad portion of the pipe should be replaced. A restricted line set will affect

the performance of the system.

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. 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 insulation. All insulation should be painted with UV resistant paint or covering to

insure long insulation life.

Fasten the copper line set to the blower coil unit as instructed by the coil installation instructions. Nitrogen should be bled

through the system at 2 to 3 PSI to prevent oxidation inside the refrigerant tubing. Use a low silver phos-copper braze alloy

on all brazed connections.

Braze line set to the service valve stubs on the

inside front of the split cabinet as shown in Figure 7.

Nitrogen should be bled through the system at 2 to

3 PSI to prevent oxidation contamination. Use a low

silver phos-copper braze alloy on all brazed connec-

tions. Envision split units are shipped with a factory

charge and service valves are not to be opened

until the line set has been leak tested, purged and

evacuated. Schrader cores should be removed

before brazing. A heat sink should be used on the

service valves and TXV to prevent damage caused

by excessive heat.

Refrigeration

Replace caps after

opening system

Service ports for

attaching refrigerant

gauges

Insulated

Suction Line

Braze

Connection

Liquid

Line

ccw

Figure 7: Typical Split System Refrigerant Line Connections

NS SPLIT INSTALLATION MANUAL

Leak Testing

The refrigeration line set must be pressurized and checked for leaks before purging and charging the unit. To pressurize

the line set, attach refrigerant gauges to the service ports and add an inert gas (nitrogen or dry carbon dioxide) until pres-

sure reaches 60 to 90 PSIG. Never use oxygen or acetylene to pressure test. Use an electronic leak detector or a good

quality bubble solution to detect leaks on all connections made in the eld. Check the service valve ports and stem for leaks

and all connections made in the eld. If a leak is found, repair it and repeat the above steps. For safety reasons do not pres-

surize the system above 150 psi. Purge pressure from line set. The system is now ready for evacuating and charging.

System Evacuation

Ensure that the line set and air coil are evacuated before opening service valves to the split unit. The line set must be

evacuated to at least 200 microns to remove the moisture and air that may still be in the line set and coil. Evacuate the sys-

tem through both service ports to prevent false readings on the gauge because of pressure drop through service ports.

Initial System Charge Calculation

The Envision unit comes with a factory pre-charge. This volume is not sufcient to run the system. Additional refrigerant

must be added for the lineset. This additional charge added to the factory pre-charge of the Envision unit should be esti-

mated using the following equation:

Addition to Factory Charge = (lineset length x oz. per ft) + (20 oz. for accumulator)

The lineset charge should be calculated by multiplying the length times 0.5 oz./ft for 3/8” liquid line and 1.0 oz/ft for 1/2”

liquid line in R-410A systems. The suction line will not hold ‘liquid’ and can be ignored for the calculation. This should result

in a slightly under-charged unit exhibiting low subcooling and high superheat. As charge is added, the subcooling should

rise and the superheat should fall until 8-16 degrees of superheat is reached when the TXV should be metering the system.

See operating details in the startup section of this manual for exact superheat and subcooling values.

Example: 038 with 40 foot of 3/8” liquid line.

Additional to be added = (40 ft x 0.5 oz./ft) + (20 oz. for accumulator)

= 40 oz.

Solution: 40 oz. should be added to the existing 56 oz. of factory charge as an initial charge.

Charging the System

Charge Method – After purging and evacuating the line set, fully open the service valves counterclockwise. Add R-410A

(liquid) into the liquid line service port until the pressure in the system reaches approximately 200 PSIG. Never add liquid

refrigerant into the suction side of a compressor. Start the unit and measure superheat and subcooling. Keep adding refrig-

erant until the unit meets the superheat and subcooling values on page 21.

Checking Superheat and Subcooling

Determining Superheat

Measure the temperature of the suction line at the point where the expansion valve bulb is clamped.

Determine the suction pressure in the suction line by attaching refrigeration gauges to the schrader connection on the

suction side of the compressor.

Convert the pressure obtained in Step 2 to the saturation temperature by using the R-410A Pressure/Temperature Con-

version Chart on page 20.

Subtract the temperature obtained in Step 3 from Step 1. The difference is the amount of superheat for the unit. Refer to

tables on page 21 for superheat ranges at specic entering water conditions.

Superheat Adjustment

TXV’s are factory set to a specic superheat; however, the superheat should be adjusted for the application. To adjust

the TXV to other superheat settings:

Remove the seal cap from the bottom of the valve.

Turn the adjustment screw clockwise to increase superheat and counterclockwise to decrease superheat. One complete

360° turn changes the superheat approximately 3-4°F, regardless of refrigerant type. You may need to allow as much as

30 minutes after the adjustment is made for the system to stabilize.

Refrigeration (continued)

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Envision R-410A Residential Installation guide

Brand: Envision

Model: R-410A Residential

Category: Split-system air conditioners

Type: Installation guide

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Envision R-410A Residential Installation guide

Envision R-410A Residential Installation guide

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