Envision Peripherals Series User manual

Envision Peripherals
Brand
Envision Peripherals
Model
Series
Category
Heat pumps
Type
User manual
WaterFurnace
IM1615 07/08
Installation Information
Water Piping Connections
Desuperheater 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
™
1
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 12-14
Wiring Schematics 15
Microprocessor Controls 16-17
Operation Logic 18
DIP Switch Settings 19
Refrigeration 20-22
Pressure/Temperature Conversion Chart 23
Unit Operating Parameters 24
Pressure Drop and Recommended Flow Rates 28
Unit Startup & Troubleshooting 26-29
Preventive Maintenance 30
Replacement Procedures 30
Physical Dimensions 31
2
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]
52
[1.47]
56
[1.59]
90
[2.55]
92
[2.61]
104
[2.95]
Coax and Water Piping
Water Connections Size - Swivel- in [mm]
HWG Connection Size - Swivel - in [mm]
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.
1 [25.4]
Dual Capacity Scroll
1 [25.4]
3
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 installation
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
4
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.)
5
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
50' Between Units)
Condensate Drain
(must be trapped)
Supply
Duct
A
i
r
Han
dl
e
r
6
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 15 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.)
7
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 12b: Thermostat Wiring for Dual Fuel Applications
Figure 12a: Thermostat Wiring
Electrical
Y1
Y2
O
R
C
C
R
Air Handler
Thermostat
24 VAC
Common Common
24 VAC
Reversing Valve
2nd Stage Compressor
1st Stage Compressor
Y1
Y2
O
R
C
G
G
Fan
W
W
Typical EZ Wiring Diagram
P1
Air Handler transformer must be at least 75 VA.
L
Lo
Fault Signal
Envision Split
8
NS SPLIT INSTALLATION MANUAL
Water Piping
Residential NS split units are supplied standard with brass water connections which will connect to ow center.
CAUTION: Never use exible hoses smaller than 1-inch inside diameter on the unit and limit
hose length to 10 feet per connection. Check carefully for water leaks.
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 3. 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 protection thermostat is installed in the unit to automatically start loop
circulator pump if loop temperature drops below 20°F. Loop freeze protection 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 3: Typical Split System Outdoor Installation Using
Closed Loop
9
NS SPLIT INSTALLATION MANUAL
Air Handler Coil Data
Line Set Sizes
1]WZAc`TOQS
/`SOa_Tb
4>7 @]ea
BcPS
2WO[SbS`
#&! ! !&
#&! !&
;ObQVW\U/W`
6O\RZS`
</6"&$
</6 $!$
3\dWaW]\
A^ZWb;]RSZ
 $!&
"'%
Unit Air Factory
Size Handler
Suction Liquid Suction Liquid Suction Liquid
Charge (oz.)
NDS026 NAH026 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 52
NDS038 NAH036 5/8" OD 3/8" OD 3/4" OD 3/8" OD 3/4" OD 1/2" OD 56
NDS049 NAH048 3/4" OD 3/8" OD 7/8" OD 3/8" OD 7/8" OD 1/2" OD 90
NDS064 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 92
NDS072 NAH060 7/8" OD 1/2" OD 7/8" OD 1/2" OD 1-1/8" OD 1/2" OD 104
Notes: Lineset charge for R410A is 0.50 oz. per ft. for 3/8" and 1.0 oz. per ft. for 1/2" tube. Rev.: 4/1/08
Initial Total System Charge = Factory Split charge + lineset charge + 20 oz, then adjust charge by subcooling and superheat measurements.
20 feet 40 feet 60 feet
Air Handler Nomenclature
</6 !$ / @
;]RSZBg^S /W`1]WZ
</6+3\dWaW]\/W`6O\RZS` @+@ST`WUS`O\b
6+6gR`]\WQ
C\Wb1O^OQWbg
@ST`WUS`O\b;]RSZa <][14; ;]b]`
 ;0BC6 & +31; & !$
 $;0BC6 ' #
!;0BC6 '&
!$;0BC6  #
" ;0BC6 " # 2WaQ]\\SQb
"&;0BC6 $ # +<]P`SOYS`W\abOZZSROdOWZOPZS]\#YEYEVSObS`a
$;0BC6 %$ +0`SOYS`W\abOZZSROdOWZOPZS]\#YE YEVSObS`a
6gR`]\WQ;]RSZa
 $;0BC6 ' #
!$;0BC6  # 3ZSQb`WQ6SOb
"&;0BC6 $ # +<]SZSQb`WQVSOb
$;0BC6 %$ #+#YEOdOWZOPZS]\ !$
+YEOdOWZOPZS]\!$
DW\bOUS #+#YEOdOWZOPZS]\" $
/+1c``S\b  + YEOdOWZOPZS]\$]\Zg
10
NS SPLIT INSTALLATION MANUAL
</6 </6 $ </6! </6!$ </6" </6"& </6$
/W`1]WZB]bOZ4OQS/`SOTb I[ K
BcPS]cbaWRSRWO[SbS`W\I[[K
<c[PS`]T`]ea
4W\a^S`W\QV
AcQbW]\ZW\SQ]\\SQbW]\W\I[[KaeSOb
:W_cWRZW\SQ]\\SQbW]\W\I[[KaeSOb
<][W\OZQ]]ZW\UQO^OQWbgb]\aIYEK &I$""K I%#'K #I&%'K !I##K !#I !K "I"$K #I%#&K
1]\RS\aObSR`OW\Q]\\SQbW]\4>BW\I[[K
0Z]eS`EVSSZAWhS2WOfEW\I[[K
0Z]eS`[]b]`bg^Sa^SSRa
0Z]eS`[]b]`]cb^cbV^IEK
4WZbS`AbO\RO`RI#[[K;3@D!RWa^]aOPZSW\I[[K
3ZSQb`WQOZQVO`OQbS`WabWQa$Vh
AVW^^W\UeSWUVbZPaIYUK
=^S`ObW\UeSWUVbZPaIYUK
&
</6 $ </6!$ </6"& </6$
/W`1]WZB]bOZ4OQS/`SOTb I[ K
BcPS]cbaWRSRWO[SbS`W\I[[K
<c[PS`]T`]ea
4W\a^S`W\QV
EObS`7\Q]\\SQbW]\W\I[[KaeSOb
EObS`=cbQ]\\SQbW]\W\I[[KaeSOb
<][W\OZQ]]ZW\UQO^OQWbgb]\aIYEK I%#'K !I##K "I"$K #I%#&K
1]\RS\aObSR`OW\Q]\\SQbW]\4>BW\I[[K
0Z]eS`EVSSZAWhS2WOfEW\I[[K
0Z]eS`[]b]`bg^Sa^SSRa
0Z]eS`[]b]`]cb^cbV^IEK
4WZbS`AbO\RO`RI#[[K;3@D!RWa^]aOPZSW\I[[K
3ZSQb`WQOZQVO`OQbS`WabWQa$Vh
AVW^^W\UeSWUVbZPaIYUK
=^S`ObW\UeSWUVbZPaIYUK
!&
I''%'K
I'%K
& !^V
31;dO`WOPZSa^SSR
 I!%!K I%"$K
f "I#&f$!#K
!"I'#K
fI %'f #"K
/W`6O\RZS`;]RSZ<c[PS`6gR`]\WQ
6gR`]\WQ
1]WZ
!
%&I  K
!
%&I  K
$'"I$"K
!&I'# K
/W`6O\RZS`;]RSZ<c[PS`@ST`WUS`O\b
3dO^]`Ob]`
1]WZ
#&!I#"K
!&I'# K
!
#&I#&%K %&I  K
!&I'# K
@ST`WUS`O\b @"O
!"I'#K
fI %'f #"K
31;dO`WOPZSa^SSR
 I!%!K I%"$K
f "I#&f$!#K
& !^V
#I'%# K I''%'K
'#I&&"#K I'%K
Physical Data
11
NS SPLIT INSTALLATION MANUAL
Envision Coil Nomenclature
<@ / 1  $ 1
1OPW\Sb
;]RSZBg^S
1+3\QOaSR
<@+3\dWaW]\@ST`WUS`O\b1]WZ
C+C\QOaSR
<6+3\dWaW]\6gR`]\WQ1]WZ
1O^OQWbg
1]\TWUc`ObW]\ @ST`WUS`O\b;]RSZa
/+/1]WZ  $;0BC6
!$;0BC6
"&;0BC6
1]WZ $;0BC6
6gR`]\WQ;]RSZa
$;0BC6
<]bS(/ZZ@ST`WUS`O\b1]WZaW\QZcRSBFDBVSS\QOaSRQ]WZQOPW\SbWaRSaWU\SRT]`c^TZ]eO^^ZWQObW]\a
Refrigerant Coil Compatibility
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
12
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.
To
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
13
NS SPLIT INSTALLATION MANUAL
Heat Recovery Connections
To maximize the benets of the heat recovery 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 heat recovery.
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 pump to operate during these conditions actually removes heat from the DHW cir-
culating 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 op-
eration, 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.
1.
2.
3.
4.
5.
6.
7.
14
NS SPLIT 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
.
Heat Recovery 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.
15
NS SPLIT INSTALLATION MANUAL
Wiring Schematics
Envision Series - Dual Capacity Split Wiring Schematic - 208-230/60/1
HWL
HP
LP
WCL
97P774-31 3/9/07
Status LED PCB
SW4
R
R
R
R
R
G
Y
R
T
T
240V L2
240V L1
240V L2
P6
Premier 2
Microprocessor
Logic Control
(DC Voltage)
P1
Fused L2
R
C
CC-GND
NO
CR2
COM
F1-10A 240V
Fused L2
NO
CR1
COM
1
2
3
4
5
6
7
8
1
2
3
P4
Pink
Black
Blue
Orange
Orange
Pink
Yellow
Yellow
1
2
3C
P2
Down
C
1
2
3
4
5
6
7
Shut
SL1 In
Not
SL1 Out
Used
NOTE 1
Acc Com
Acc NC
Acc NO
1
2
3
P3
1 2 3
Main Logic PCB
F1-10A
240V
Tan
6
5
4
8
7
P5
12
1
2
9
10
3
4
9
11
2
10
8
1
12
5
3
13
14
15
16
11
G
W
O
R
C
Y1
Y2
LO
On
SW1
1
2
3
4
5
6
7
8
9
10
11
12
ECM2
Air Flow
Settings
Black
Blue
14
13
6
7
CC
NO
NC
CR4 COM
NO
NC
CR3 COM
RV
CCHI
Not Used
Not Used
On
SW3
On
SW2
1
2
3
4
5
6
7
8
No Htg3 / Htg3
Dehum / Norm
Fan / Comp
Loop / Well
Test / Norm
Outputs / Norm
Inputs / Norm
2 Speed / 1 Speed
Normal / Finish on 2
nd
(Note 2)
No RPM / RPM
Electric Heat / Normal
Envision / E Series or Premier
1
2
3
4
5
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
Y1
Y2
O
G
W
SL1
SL2
--
Inputs
#6 On, #7 Off
Compressor Lo
Compressor Hi
RV
FAN
DHW Pump
Loop Pump 1
Loop Pump 2
--
Outputs
#6 Off, #7 Off
Blower Lo
Blower Med
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.
G
T
132
P
L1
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
Y1
Y2
O
R
C
L
C
R
Fossil Fuel
Furnace
Thermostat
24 VAC
Common Common
24 VAC
Fault Sig nal
Reversing Valve
2nd St age Compressor
1st Stage Compressor
Y1
Y2
O
R
C
LO
Envision Split
G
G
Fan
W
W
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
P2
P1
Shut
Auxiliary
Heat Relay
Down
= chass is
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 USED
NOTE 5
DHW
Pump
Blu
3A
Fuse
Pink
Blu(17)
Ext Pump
1/2 hp Total
208-230/60/1
Pump Pump
G
2
1
PB1
1
2
Yel(8)
Pink(13)
Unit Power
208-230/60/1
G
L2 L1
CC
C
S
R
Run
Capacitor
Red Black
Blue
Tan
(16)
Comfort Alert
CC
Blk(1)
Violet(2)
Comfort
Alert
R
Y
C
Violet(3)
Blk(5)
Yel(6)
L
Comfort Alert
NOTE 3
CS
+
-
DC SOL
Wht(4)
Brn(15)
Org(14)
Gry(9)
C
NOTE 6
SL1 In
SL1 Out
Optional
Remote Unit
Without
Loop Pump
Y2
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.
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
16
NS SPLIT 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 Justication
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) 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) 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.
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) 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
Microprocessor Control
17
NS SPLIT INSTALLATION MANUAL
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.)
18
NS SPLIT INSTALLATION MANUAL
OPERATION LOGIC
HEATING COOLING
FAN ON
SL1 - IN
ON
SL2 - 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 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
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
Page is loading ...
  • Page 1 1
  • Page 2 2
  • Page 3 3
  • Page 4 4
  • Page 5 5
  • Page 6 6
  • Page 7 7
  • Page 8 8
  • Page 9 9
  • Page 10 10
  • Page 11 11
  • Page 12 12
  • Page 13 13
  • Page 14 14
  • Page 15 15
  • Page 16 16
  • Page 17 17
  • Page 18 18
  • Page 19 19
  • Page 20 20
  • Page 21 21
  • Page 22 22
  • Page 23 23
  • Page 24 24
  • Page 25 25
  • Page 26 26
  • Page 27 27
  • Page 28 28
  • Page 29 29
  • Page 30 30
  • Page 31 31
  • Page 32 32
  • Page 33 33
  • Page 34 34
  • Page 35 35
  • Page 36 36

Envision Peripherals Series User manual

Envision Peripherals
Brand
Envision Peripherals
Model
Series
Category
Heat pumps
Type
User manual
Download PDF
report

Ask a question and I''ll find the answer in the document

Finding information in a document is now easier with AI

Related papers

Other documents