Envision Series Geothermal Indoor Split Heat Pumps
• R-410A Refrigerant
• 2 - 6 Ton Single Speed
• 2 - 6 Ton Dual Capacity
Installation Information
Water Piping Connections
Desuperheater Connections
Electrical
Startup Procedures
Troubleshooting
Preventive Maintenance
Envision Split Installation Manual
IM1592 06/07
ENVISION SERIES INSTALLATION MANUAL
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
Model 022 030 036 042 048 060 070 026 038 049 064 072
Compressor (1 each)
Factory Charge R410a, oz [kg]
56
[1.59]56[1.59]56[1.59]74[2.1]90[2.55]92[2.61]
108
[3.06]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]
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]
Model Nomenclature
Physical Characteristics
2
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
3
ENVISION SERIES INSTALLATION MANUAL
General Installation Information
Safety Considerations
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.
Installing and servicing heating and air conditioning equipment can be hazardous due to system pressure and electri-
cal components. Only trained and qualied 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 sufcient room to make water, electrical and refrigerant line
connections. Any access panel screws that would be difcult 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 specied 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
4
ENVISION SERIES INSTALLATION MANUAL
General Installation Information (continued)
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
airow quietly. If air noise or excessive airow is a problem, the blower speed can be changed to a lower speed to
reduce airow. This will reduce the performance of the unit slightly in heating; however, it will increase the temperature
rise across the air coil. Airow 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 orice 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 benets 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 orice systems should be used
•
A life expectancy of more than 7 years remaining for the air handler and components
•
5
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
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 insulation. All exterior insulation should be painted with UV resistant paint or covering to insure long insulation life.
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 specied 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.
Figure 1: Typical Split System Application with Remote Blower Coil
6
ENVISION SERIES INSTALLATION MANUAL
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
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.
Figure 2: Typical Split System Heat Pump Coil Add-On Fossil Fuel Furnace
7
ENVISION SERIES INSTALLATION MANUAL
Locking
Ring
Stainless
Steel
Snap Ring
Gasket
Support
Sleeve
Gasket
Material
Water Piping
The proper water ow must be provided to each unit whenever the unit
Figure 3: Swivel Connections
(Residential Units)
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.
All source water connections on residential units are swivel piping ttings
(see Figure 3) that accept 1-inch male pipe threads (MPT) . The swivel connector 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 connection 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 gently 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 pressure/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.
8
Air Handler Coil Data
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
Notes: * Variable speed air handler required for all dual capacity units.
Line Set Sizes
ENVISION SERIES INSTALLATION MANUAL
9
ENVISION SERIES INSTALLATION MANUAL
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
1
2
3
C
R
P1
P3
SV
Solenoid
Valve
CC-GND
CC
CCHI
Comfort
Alert
Y1
Y2
Logic Board
Violet(3)
Blk(1)
Wht(4)
VM valve
Violet(2)
CC
Open Loop - Well Water Systems
Typical open loop piping is shown below. Always maintain water pressure in the heat exchanger by placing water control 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 specication 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 departments 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
Figure 5: Open Loop Solenoid Valve Connection Option
Typical quick operating external 24V water solenoid valve
(type PPV100 or BPV100) wiring.
Figure 9b: Open Loop Solenoid Valve Connection Option
Typical slow operating external 24V water solenoid valve
(type VM) wiring.
10
ENVISION SERIES INSTALLATION MANUAL
Open Loop - Well Water Systems (continued)
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 present, 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 qualied
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.
11
ENVISION SERIES INSTALLATION MANUAL
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
SL1InSL1
Out
Envision Unit #1
To Electromechanical Unit
C
S
Shut
Down
C C
Shut
Down
C C
SL1InSL1
Out
SL1InSL1
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
SL1InSL1
Out
SL1InSL1
Out
Dual Capacity
Envision Unit #1
Envision Unit #2
Dual Capacity
Envision to Envision
Microprocessor Units
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 specication catalog. Usually 2.5 to 3 GPM of
ow per ton of cooling capacity
is recommended in earth loop
applications.
Figure 7: Typical Split System Application Closed Loop - Earth Coupled
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 8: Primary/Secondary Hook-up
12
ENVISION SERIES INSTALLATION MANUAL
Drain Valve
In
P/T Relief
Valve
Cold
Water In
Hot
Water Out
DHW
Water In
DHW
Water Out
Venting Waste Valv e
or Vent Coupling
3/4˝ x 3/4˝ x 1/2˝ tee
Drain Valve Drain Valve
In
P/T Relief
Valve
Venting Waste Valve
or Vent Coupling
DHW
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 benets 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.
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.
Water Tank Preparation
To install a unit with desuperheater, follow these installation guidelines.
Turn off the power to the water heater.
1.
Attach a water hose to the water tank drain connection and run the other end of the hose to an open drain or
2.
outdoors.
Close the cold water inlet valve to the water heater tank.
3.
Drain the tank by opening the valve on the bottom of the tank, then open the pressure relief valve or hot water
4.
faucet.
Flush the tank by opening the cold water inlet valve to the water heater to free the tank of sediments. Close when
5.
draining water is clear.
Disconnect the garden hose and remove the drain valve from the water heater.
6.
Refer to Plumbing Installation and Desuperheater Startup on page 14.
7.
Residential units with desuperheaters contain an internal circulator and ttings.
CAUTION: Elements will burn out if energized dry.
Figure 11: Desuperheater Installation in Preheat TankFigure 10: Typical Desuperheater Installation
13
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 specic
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.
14
ENVISION SERIES INSTALLATION MANUAL
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
Y1
Y2
O
R
C
L
C
R
Fossil Fuel
Furnace
Thermostat
24 VAC
Common Common
24 VAC
Fault Signal
Reversing Valve
2nd Stage Compressor
1st Stage Compressor
Y1
Y2
O
R
C
LO
G
G
Fan
W
W
Auxiliary Heat Relay
Note: Field installed DPST dual fuel relay
(Required for dual fuel installation)
Auxiliary Heat Relay
P2
P1
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
Voltage
Min/Max
Compressor
Electrical
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 electrical data for fuse or cicuit breaker sizing information.
Electrical Data
Thermostat Wiring
Figure 12a: Thermostat Wiring, Single and Dual
Capacity Units
Figure 12b: Thermostat Wiring for Dual Fuel Applications
15
ENVISION SERIES INSTALLATION MANUAL
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
DownC1
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 / 1Speed
Normal / Finish on 2nd(Note 2)
No RPM / RPM
Electric Heat / Normal
Envision / E Seriesor Premier
1
2
3
4
5
Pulse L / ConstantL (NOTE4)
Field Selection Dips -#1 On,# 6 On, #7 On
Drain pan overflow Lockout
FP thermistor (loop<15°F,well<30°F) Lockout
High Pressure > 600PSI Lockout
Low Pressure < 40 PSILockout
ECM2 RPM < 100rpm Lockout
Microprocessormalfunction *
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 > 600PSI
Low Pressure < 40 PSI
ECM2 RPM < 100rpm
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 CR2CR3 CR4 -
F1 and F2 -
WCL -
HE HP -
LP PB1, PB2 PS RV SW1 SW2 SW3 SW4 TS -
Compressor Contactor
Condensateoverflow 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 ContactsN.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 **DCCoil**
CA -
Comfort Alert
Y1
Y2
O
R
C
L
C
R
Fossil Fuel
Furnace
Thermostat
24 VAC
Common Common
24 VAC
Fault Signal
Reversing Valve
2nd Stage 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: Fieldinstalled DPST dual fuel relay
(Required for dual fuel installation)
Auxiliary Heat Relay
P2
P1
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 RunTime
Code 2 Sy stem Pressure Trip
Code 3 Short Cycling
Code 4 Locked Rotor
Code 5 Open Circuit
Code 6 Open Start Circuit
Code 7 Open RunCircuit
Code 8 W elded 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 signaland in the ON positionfor constant
“L” lockout signal.
2 – This Switch allows the unit to down stage withthe t -stat when OFF and finish on second stagewhen
ON. Finish s econd stage reducesstage changing in recip dual capacitycompressors 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 havea loop pump for slave operation .
3 - Comfort Alert fault output to Premier Control Board
Wiring Schematics
Envision Series - Dual Capacity Split Wiring Schematic - 208-230/60/1
16
ENVISION SERIES INSTALLATION MANUAL
HWL
HP
LP
WCL
97P774-30 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
DownC1
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 / 1Speed
Normal / Finish on 2nd(Note 2)
No RPM / RPM
Electric Heat / Normal
Envision / E Seriesor Premier
1
2
3
4
5
Pulse L / ConstantL (NOTE4)
Field Selection Dips -#1 On,# 6 On, #7 On
Drain pan overflow Lockout
FP thermistor (loop<15°F,well<30°F) Lockout
High Pressure > 600PSI Lockout
Low Pressure < 40 PSILockout
ECM2 RPM < 100rpm Lockout
Microprocessormalfunction *
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 > 600PSI
Low Pressure < 40 PSI
ECM2 RPM < 100rpm
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
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 signaland in the ON positionfor constant
“L” lockout signal.
2 – This Switch allows the unit to down stage withthe t -stat when OFF and finish on second stagewhen
ON. Finish second stage reduces stage changing in recip dual capacitycompressors 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 CR2CR3 CR4 -
F1 and F2 -
WCL -
HE HP -
LP PB1, PB2 PS RV SW1 SW2 SW3 SW4 TS -
Compressor Contactor
Condensateoverflow 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 ContactsN.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 **DCCoil**
CA -
Comfort Alert
Y1
Y2
O
R
C
L
C
R
Fossil Fuel
Furnace
Thermostat
24 VAC
Common Common
24 VAC
Fault Signal
Reversing Valve
2nd Stage Compressor
1st Stage Compressor
Y1
Y2
O
R
C
LO
EZ Split
G
G
Fan
W
W
Auxiliary Heat Relay
Duel Fuel Wiring Diagram
Using Field Installed Relay
Note: Fieldinstalled DPST dual fuel relay
(Required for dual fuel installation)
Auxiliary Heat Relay
P2
P1
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 RunTime
Code 2 Sy stem Pressure Trip
Code 3 Short Cycling
Code 4 Locked Rotor
Code 5 Open Circuit
Code 6 Open Start Circuit
Code 7 Open RunCircuit
Code 8 W elded Contactor
Code 9 Low Voltage
Yellow
Comfort Alert Status
NOT U
S
E
D
5 - DHW pump only in models with hot water generation option .
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
Brn(15)
Org(14)
Gry(9)
C
NOTE 6
SL1 In
SL1 Out
Optional
Remote Unit
Without
Loop Pump
6 - Connection of remote unit that does not havea loop pump for slaveoperation .
3 - Comfort Alert fault output to Premier Control Board
Wiring Schematics
Envision Series - Single Speed Split Wiring Schematic - 208-230/60/1
17
ENVISION SERIES INSTALLATION MANUAL
Microprocessor Control
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.)
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) 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.
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
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 deman d, t he
additional st ages of resi stance heat engage sequ enti ally
ev ery 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.
18
Microprocessor Control (cont.)
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 dehumidication mode).
Cool, 2nd Stage (Y1, Y2, O) Single Speed Units
The fan changes to high speed (85% of high speed if in
dehumidication 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 dehumidication mode). The Comfort Alert will
delay the second stage compressor until 5 seconds after it
receives a “Y2” from the board.
ENVISION SERIES INSTALLATION MANUAL
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.
19
ENVISION SERIES INSTALLATION MANUAL
Operation Logic Data
OPERATION LOGIC
STG1 STG2 STG3 EMERG STG1 STG2
HEATING COOLING
FAN ON
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 - -
SL1 - IN ONSL2 - IN
ON
20
DIP Switch Settings
ENVISION SERIES INSTALLATION MANUAL
DIP SWITCH
NUMBER
SW1 N/A NOT USED N/A N/A
Service/Test Mode - Allows control of “NORM” or “TEST” opera-
tional modes. Test mode accelerates most timing functions 16
1
times to allow faster troubleshooting. Test mode also allows viewing the “CURRENT” status of the fault inputs on the LED display.
Freeze Sensing Setting
Allows eld selection of freeze thermistor fault sensing tempera-
2
tures for well water (30°F) or antifreeze-protected (15°F) earth
loops.
Accessory Relay
3
Allows eld selection of the accessory relay to operate with the
compressor or fan.
SW2
4 NOT USED N/A N/A
5 NOT USED N/A N/A
Input Diagnostics - Allows viewing the inputs from the thermo-
6
stat to the control board such as Y1, Y2, O, G, W, SL1-In on the
LED display.
DESCRIPTION OFF POSITION ON POSITION
Test Norm
Loop
(Protection 15° F)
Fan Comp
Diagnostic Inputs
viewed at LEDs
Well
(Protection 30° F)
Normal Display
viewed at LEDs
SW3
Output Diagnostics - Allows viewing the outputs from the control
7
board such as the compressor, reversing valve, blower, hot water
pump, and loop pump on the LED display.
Thermostat Selection
8
Congures the control for a pulsed lockout signal (ComforTalk and
FaultFlash thermostats) or continuous 5 VAC lockout signal.
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
2
when off and nish with second stage when on. Finish on second
stage reduces stage changing in reciprocating dual capacity
compressors.
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
5
when off, and 1 minute delay when on. A delay is required on all
reciprocating dual capacity units.
Diagnostic
Outputs viewed at
LEDs
Pulsed “L”
signal
Normal -
All other systems
Envision
Normal
Display viewed
at LEDs
Continuous “L”
signal
Finish on 2nd
Unzoned Dual
Capacity
E-Series or
Premier 2 speed
E-Series or
Premier
21
ENVISION SERIES INSTALLATION MANUAL
Replace caps after
opening system
Service ports for
attaching refrigerant
gauges
Insulated
Suction Line
Braze
Connection
Liquid
Line
ccw
ccw
TXV ("IN" toward condensing unit)
Equalizer
Bulb
Suction
Liquid
TXV has internal check valve
Refrigeration
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 insulated. 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 shown in Figure 14.
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
13. 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
connections. 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.
Figure 14: Attaching the Air Coil
Figure 13: Typical Split System Refrigerant Line Connections
Position Description System
CW - Full In Shipping Position Closed Open
CCW - Full Out 1/2 turn CW Service Position Open Open
CCW - Full Out Operation Position Open Closed
Service
Port
22
ENVISION SERIES INSTALLATION MANUAL
Refrigeration (continued)
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 pressure 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 pressurize 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 system 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 sufcient 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: 036 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 pages 26 and 27.
Checking Superheat and Subcooling
Determining Superheat
Measure the temperature of the suction line at the point where the expansion valve bulb is clamped.
1.
Determine the suction pressure in the suction line by attaching refrigeration gauges to the schrader connection on the
2.
suction side of the compressor.
Convert the pressure obtained in Step 2 to the saturation temperature by using the R-410A Pressure/Temperature Con-
3.
version Chart on page 25.
Subtract the temperature obtained in Step 3 from Step 1. The difference is the amount of superheat for the unit. Refer to
4.
tables on pages 26-27 for superheat ranges at specic entering water conditions.
Superheat Adjustment
TXV’s are factory set to a specic 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.
1.
Turn the adjustment screw clockwise to increase superheat and counterclockwise to decrease superheat. One complete
2.
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.
23
ENVISION SERIES INSTALLATION MANUAL
Once the proper superheat setting has been achieved, replace and tighten the seal cap.
3.
Warning: There are 8 total (360°) turns on the superheat adjustment stem from wide open to fully closed. When adjusting
the superheat stem clockwise (superheat increase) and the stop is reached, any further clockwise turning adjustment will
damage the valve.
Determining Subcooling
Measure the temperature of the liquid line on the small refrigerant line (liquid line) just outside the split cabinet. This
1.
location will be adequate for measurement in both modes unless a signicant temperature drop in the liquid line is
anticipated.
Measure the liquid line pressure by attaching refrigerant gauges to the schrader connection on the liquid line service
2.
valve.
3. Convert the pressure obtained in Step 2 to the saturation temperature by using the R-410A Pressure/Temperature
Conversion Chart on page 25.
4. Subtract the temperature in Step 1 from the temperature in Step 3. The difference will be the subcooling value for
that unit. Refer to the tables on pages 26-27 for subcooling ranges at specic enter water conditions.
24
ENVISION SERIES INSTALLATION MANUAL
Pressure/Temperature Coversion Chart for R-410A
PRESSURE
(PSIG)
TEMP °FPRESSURE
(PSIG)
TEMP
°F
PRESSURE
(PSIG)
TEMP °FPRESSURE
(PSIG)
TEMP
°F
PRESSURE
(PSIG)
60 8.5 180 63.5 300 96.3 420 120.6 540 140.0
62 9.9 182 64.2 302 96.8 422 120.9 542 140.3
64 11.2 184 64.8 304 97.2 424 121.3 544 140.6
66 12.5 186 65.5 306 97.7 426 121.6 546 140.9
68 13.8 188 66.1 308 98.1 428 122.0 548 141.2
70 15.1 190 66.8 310 98.6 430 122.3 550 141.4
72 16.3 192 67.4 312 99.0 432 122.7 552 141.7
74 17.5 194 68.0 314 99.5 434 123.0 554 142.0
76 18.7 196 68.7 316 99.9 436 123.4 556 142.3
78 19.8 198 69.3 318 100.4 438 123.7 558 142.6
80 21.0 200 69.9 320 100.8 440 124.1 560 142.9
82 22.1 202 70.5 322 101.2 442 124.4 562 143.2
84 23.2 204 71.1 324 101.7 444 124.8 564 143.5
86 24.3 206 71.7 326 102.1 446 125.1 566 143.7
88 25.4 208 72.3 328 102.5 448 125.4 568 144.0
90 26.5 210 72.9 330 103.0 450 125.8 570 144.3
92 27.5 212 73.5 332 103.4 452 126.1 572 144.6
94 28.6 214 74.1 334 103.8 454 126.5 574 144.9
96 29.6 216 74.7 336 104.2 456 126.8 576 145.1
98 30.6 218 75.3 338 104.7 458 127.1 578 145.4
100 31.6 220 75.8 340 105.1 460 127.5 580 145.7
102 32.6 222 76.4 342 105.5 462 127.8 582 146.0
104 33.5 224 77.0 344 105.9 464 128.1 584 146.2
106 34.5 226 77.5 346 106.3 466 128.5 586 146.5
108 35.4 228 78.1 348 106.7 468 128.8 588 146.8
110 36.4 230 78.7 350 107.2 470 129.1 590 147.1
112 37.3 232 79.2 352 107.6 472 129.4 592 147.3
114 38.2 234 79.8 354 108.0 474 129.8 594 147.6
116 39.1 236 80.3 356 108.4 476 130.1 596 147.9
118 40.0 238 80.9 358 108.8 478 130.4 598 148.2
120 40.9 240 81.4 360 109.2 480 130.7 600 148.4
122 41.7 242 81.9 362 109.6 482 131.1 602 148.7
124 42.6 244 82.5 364 110.0 484 131.4 604 149.0
126 43.4 246 83.0 366 110.4 486 131.7 606 149.2
128 44.3 248 83.5 368 110.8 488 132.0
608 149.5
130 45.1 250 84.1 370 111.2 490 132.3
132 45.9 252 84.6 372 111.6 492 132.7
134 46.7 254 85.1 374 112.0 494 133.0
136 47.5 256 85.6 376 112.3 496 133.3
138 48.3 258 86.1 378 112.7 498 133.6
140 49.1 260 86.6 380 113.1 500 133.9
142 49.9 262 87.1 382 113.5 502 134.2
144 50.7 264 87.7 384 113.9 504 134.5
146 51.5 266 88.2 386 114.3 506 134.9
148 52.2 268 88.7 388 114.7 508 135.2
150 53.0 270 89.2 390 115.0 510 135.5
152 53.7 272 89.6 392 115.4 512 135.8
154 54.5 274 90.1 394 115.8 514 136.1
156 55.2 276 90.6 396 116.2 516 136.4
158 55.9 278 91.1 398 116.5 518 136.7
160 56.6 280 91.6 400 116.9 520 137.0
162 57.4 282 92.1 402 117.3 522 137.3
164 58.1 284 92.6 404 117.6 524 137.6
166 58.8 286 93.0 406 118.0 526 137.9
168 59.5 288 93.5 408 118.4 528 138.2
170 60.2 290 94.0 410 118.7 530 138.5
172 60.8 292 94.5 412 119.1 532 138.8
174 61.5 294 94.9 414 119.5 534 139.1
176 62.2 296 95.4 416 119.8 536 139.4
178 62.9 298 95.8 418 120.2 538 139.7
TEMP
°F
25
ENVISION SERIES INSTALLATION MANUAL
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat Subcooling
Water Temp
Rise °F
Air Temp
Drop °F DB
1.5 120 - 142 215 - 240 7 - 15 7 - 14 18 - 22 18 - 22
3.0 115 - 138 190 - 225 10 - 18 4 - 11 8 - 10 18 - 22
1.5 125 - 148 290 - 315 8 - 14 6 -11 18 - 22 18 - 22
3.0 123 - 146 255 - 290 9 - 15 5 - 10 8 - 10 18 - 22
1.5 134 - 157 340 - 380 8 - 14 6 - 13 18 - 22 16 - 20
3.0 130 - 155 310 - 350 9 - 15 5 - 12 8 - 10 16 - 20
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat Subcooling
Water Temp
Drop °F
Air Temp
Rise °F DB
1.5 69 - 81 254 - 334 7 - 13 5 - 13 7 -10 18 - 24
3.0 75 - 87 260 - 340 7 - 14 5 - 13 3 - 6 20 - 26
1.5 98 - 113 293 - 373 7 - 14 7 - 15 8 - 11 20 - 26
3.0 105 - 120 300 - 380 7 - 15 7 - 15 4 - 7 22 - 28
1.5 133 - 150 315 - 415 9 - 15 9 - 16 11 - 14 26 - 32
3.0 139 - 157 325 - 425 9 - 15 9 - 16 7 - 10 28 - 34
Entering Water
Temp °F
Water Flow
GPM/Ton
Cooling -- No Desuperheater
50
70
90
Entering Water
Temp °F
Water Flow
GPM/Ton
Heating -- No Desuperheater
30
50
70
Note: Cooling performance based on entering air temperatures of 80º F DB, 67º F WB.
Heating performance based on entering air temperature of 70º F DB.
Unit Operating Parameters
Single Speed Models
26
Unit Operating Parameters
Note: Cooling performance based on entering air temperatures of 80º F DB, 67º F WB.
Heating performance based on entering air temperature of 70º F DB.
First Stage Operation
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat Subcooling
Water Temp
Rise °F
Air Temp
Drop °F DB
1.5 125-140 205-225 9-15 3-10 17-21 17-23
3.0 120-135 190-210 9-15 3-10 8-12 17-23
1.5 135-145 260-290 9-18 5-11 16-20 17-23
3.0 126-143 230-250 9-18 5-11 9-13 17-23
1.5 138-150 315-345 8-14 7-14 14-20 17-23
3.0 136-148 300-330 8-14 7-14 8-12 17-23
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat Subcooling
Water Temp
Drop °F
Air Temp
Rise °F DB
1.5 76-89 260-325 7-12 4-16 5-9 12-16
3.0 80-93 265-330 7-12 4-16 3-7 14-18
1.5 105-120 295-355 7-14 4-16 7-11 18-22
3.0 110-125 300-360 7-14 4-16 5-9 20-24
1.5 135-155 330-385 9-14 7-15 8-12 24-28
3.0 140-160 335-390 9-14 7-15 6-10 22-30
Second Stage Operation
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat Subcooling
Water Temp
Rise °F
Air Temp
Drop °F DB
1.5 120-135 215-235 10-16 3-11 17-21 17-23
3.0 115-130 200-220 10-16 3-11 8-12 17-23
1.5 121-136 270-305 9-15 5-12 16-20 17-23
3.0 118-133 255-285 9-15 5-12 9-13 17-23
1.5 126-143 325-360 8-14 7-15 14-20 17-23
3.0 123-140 310-340 8-14 7-15 8-12 17-23
Suction
Pressure
PSIG
Discharge
Pressure
PSIG
Superheat Subcooling
Water Temp
Drop °F
Air Temp
Rise °F DB
1.5 72-81 280-330 6-12 10-20 5-9 12-16
3.0 76-85 285-335 6-12 10-20 3-7 14-18
1.5 100-115 305-370 6-12 6-18 7-11 18-22
3.0 105-120 310-375 6-12 6-18 5-9 20-24
1.5 133-147 340-400 7-14 4-15 8-12 24-28
3.0 138-152 345-405 7-14 4-15 6-10 22-30
Heating -- No Desuperheater
30
50
70
70
90
Entering Water
Temp °F
Water Flow
GPM/Ton
Entering Water
Temp °F
Water Flow
GPM/Ton
Cooling -- No Desuperheater
50
Entering Water
Temp °F
Water Flow
GPM/Ton
Cooling -- No Desuperheater
50
70
90
Entering Water
Temp °F
Water Flow
GPM/Ton
Heating -- No Desuperheater
30
50
70
Dual Capacity Models
ENVISION SERIES INSTALLATION MANUAL
27
ENVISION SERIES INSTALLATION MANUAL
Unit Startup
Before Powering Unit, Check The Following:
High voltage is correct and matches nameplate.
•
Fuses, breakers and wire size correct.
•
Low voltage wiring complete.
•
Piping completed and water system cleaned and ushed.
•
Air is purged from closed loop system.
•
Isolation valves are open, water control valves or loop pumps wired.
•
Condensate line open and correctly pitched.
•
Transformer switched to 208V if applicable.
•
DIP switches are set correctly.
•
DHW pump switch is “OFF” unless piping is completed and air has been purged.
•
Blower rotates freely.
•
Blower speed correct.
•
Air lter/cleaner is clean and in position.
•
Service/access panels are in place.
•
Return air temperature is between 50-80ºF heating and 60-95ºF cooling.
•
Check air coil cleanliness to insure optimum performance. Clean as needed according to maintenance guidelines.
•
To obtain maximum performance the air coil should be cleaned before startup. A 10-percent solution of dishwasher
detergent and water is recommended for both sides of coil, a thorough water rinse should follow.
Startup Steps
Notes: Complete the Equipment Start-Up/Commissioning Check Sheet during this procedure. Refer to thermostat operating
instructions and complete the startup procedure.
1. Initiate a control signal to energize the blower motor. Check blower operation.
2. Initiate a control signal to place the unit in the cooling mode. Cooling setpoint must be set below room temperature.
3. First stage cooling will energize after a time delay.
4. Be sure that the compressor and water control valve or loop pump(s) are activated.
5. Verify that the water ow rate is correct by measuring the pressure drop through the heat exchanger using the P/T
plugs and comparing to unit capacity data in specication catalog.
6. Check the temperature of both the supply and discharge water (see page 26-27).
7. Check for an air temperature drop of 15°F to 25°F across the air coil, depending on the fan speed and entering water
temperature.
8. Decrease the cooling set point several degrees and verify high-speed blower operation.
9. Adjust the cooling setpoint above the room temperature and verify that the compressor and water valve or loop pumps
deactivate.
10. Initiate a control signal to place the unit in the heating mode. Heating set point must be set above room temperature.
11. First stage heating will energize after a time delay.
12. Check the temperature of both the supply and discharge water (see page 26-27).
13. Check for an air temperature rise of 20°F to 35°F across the air coil, depending on the fan speed and entering water
temperature.
14. If auxiliary electric heaters are installed, increase the heating setpoint until the electric heat banks are sequenced on.
All stages of the auxiliary heater should be sequenced on when the thermostat is in the Emergency Heat mode.
Check amperage of each element.
28
ENVISION SERIES INSTALLATION MANUAL
15. Adjust the heating setpoint below room temperature and verify that the compressor and water valve or loop pumps
deactivate.
16. During all testing, check for excessive vibration, noise or water leaks. Correct or repair as required.
17. Set system to desired normal operating mode and set temperature to maintain desired comfort level.
18. Instruct the owner/operator in the proper operation of the thermostat and system maintenance.
Notes: Be certain to ll out and forward all warranty registration papers.
Final Evaluation
After the initial check of superheat/subcooling values in the heating mode, shut off the unit and allow it to sit 3 to 5 minutes until pressures equalize. Restart the unit in the cooling mode and check the values against those in tables on pages 26
and 27. If the unit performs satisfactorily, charging is complete. If the unit does not perform to specications, the charge may
need to be readjusted until the values are close. Adding refrigerant will increase subcooling. Recovering some of the refrigerant will decrease subcooling and increase superheat. If the superheat/subcooling values are still not close to the specications in tables on pages 26 and 27, analyze refrigerant circuit operation.
29
ENVISION SERIES INSTALLATION MANUAL
Heating Cycle Analysis
COOLING TXV - ACTIVE
RIGHT TO LEFT
ClgTXV
Lineset
length
Measure liquid line
temperature and
pressure here in
both heating and
cooling modes
COAX
HEATING TXV - ACTIVE LEFT TO RIGHT
HtgTXV
Measure suction temperature
here at TXV bulb in heating modes.
Suct PSI____
Suct sat temp____
Volts ____
Amps ____
EWT ____
LWT ____
Suct temp____
Super heat____
Discharge PSI____
Disch. sat temp____
Liquid temp____
Sub cooling____
Bi-flow
filter/drier
Air
Coi
l
Suctio
n
Discharge
Com
p
De
sup
er-
he
ate
r
Measure suction
temperature here
at TXV bulb in
cooling modes.
Cooling Cycle Analysis
COOLING TXV - ACTIVE
RIGHT TO LEFT
ClgTXV
Measure liquid line
temperature and
pressure here in
both heating and
cooling modes
COAX
HEATING TXV-ACTIVE LEFT TO RIGHT
HtgTXV
Measure suction temperature
here at TXV bulb in heating modes.
Suct PSI ____
Suct sat temp ____
Volts ____
Amps ____
EWT ____
LWT ____
Suct temp ____
Super heat ____
Discharge PSI ____
Disch. sat temp ____
Liquid temp ____
Sub cooling ____
Bi-flow
filter/drier
Air
Coi
l
Suctio
n
Discharge
Com
p
De
sup
er-
he
ate
r
Measure suction
temperature here
at TXV bulb in
cooling modes.
Note: DO NOT hook up pressure gauges unless there appears to be a performance problem.
Lineset
length
Unit Startup/Troubleshooting
30
ENVISION SERIES INSTALLATION MANUAL
30°F 50°F 70°F 90°F 110°F
4 1.4 1.3 1.2 1.1 1.0
6 2.8 2.6 2.4 2.3 2.1
8 4.7 4.4 4.1 3.8 3.5
10 7.0 6.6 6.2 5.8 5.3
3 0.8 0.7 0.7 0.7 0.6
5 2.0 1.8 1.7 1.6 1.5
7 3.6 3.4 3.2 3.0 2.8
9 5.8 5.5 5.1 4.8 4.4
5 1.2 1.2 1.1 1.0 1.0
7 2.2 2.1 1.9 1.8 1.7
9 3.4 3.2 3.0 2.8 2.6
11 4.9 4.6 4.3 4 3.7
4 0.9 0.8 0.8 0.7 0.7
6 1.7 1.6 1.5 1.4 1.3
8 2.8 2.6 2.5 2.3 2.1
10 4.2 3.9 3.7 3.4 3.2
6 1.2 1.2 1.1 1.0 1.0
9 2.4 2.2 2.1 2.0 1.8
12 3.9 3.6 3.4 3.2 2.9
15 5.7 5.3 5 4.7 4.3
5 0.9 0.9 0.8 0.8 0.7
8 2.0 1.8 1.7 1.6 1.5
11 3.4 3.1 2.9 2.8 2.5
14 5.0 4.7 4.4 4.1 3.8
8 1.8 1.7 1.6 1.4 1.3
12 3.8 3.5 3.3 3.0 2.8
16 6.5 6.0 5.6 5.2 4.8
20 9.7 9.1 8.5 8.0 7.4
6 1.0 0.9 0.9 0.8 0.8
10 2.6 2.5 2.3 2.1 2.0
14 5.0 4.7 4.4 4.1 3.8
18 8.1 7.6 7.1 6.6 6.1
12 3.2 3.0 2.8 2.6 2.4
15 4.5 4.2 4.0 3.7 3.4
18 6.0 5.7 5.3 4.9 4.6
21 7.8 7.3 6.8 6.4 5.9
10 2.3 2.1 2.0 1.9 1.7
13 3.6 3.3 3.0 2.8 2.6
16 5.0 4.6 4.3 4.0 3.7
19 6.5 6.2 5.8 5.4 5.0
5/30/06
038
full
load
049
part
load
064
full
load
072
part
load
064
part
load
072
full
load
Pressure Drop (psi)
Model GPM
026
part
load
038
part
load
049
full
load
026
full
load
30°F 50°F 70°F 90°F 110°F
3 0.9 0.9 0.8 0.7 0.7
022
4.5 1.7 1.6 1.5 1.4 1.3
6 2.8 2.7 2.5 2.3 2.2
8 4.7 4.4 4.1 3.9 3.6
4 1.5 1.4 1.3 1.2 1.1
030
6 3.0 2.8 2.7 2.5 2.3
8 5.1 4.8 4.5 4.2 3.9
10 7.7 7.2 6.8 6.3 5.8
5 1.0 1.0 0.9 0.8 0.8
036
7 2.1 1.9 1.8 1.7 1.6
9 3.6 3.3 3.0 2.8 2.6
12 6.3 5.9 5.5 5.1 4.8
5 0.8 0.7 0.7 0.7 0.6
042
8 2.1 2.1 1.9 1.8 1.7
11 4.2 4.1 3.8 3.5 3.3
14 7.6 6.7 6.3 5.8 5.4
6 1.1 1.0 1.0 0.9 0.8
048
9 2.3 2.1 2.0 1.9 1.7
12 3.9 3.7 3.4 3.2 3.0
16 6.7 6.3 5.9 5.5 5.1
9 2.4 2.2 2.1 2.0 1.8
060
12 3.9 3.6 3.4 3.2 2.9
15 5.7 5.3 5.0 4.7 4.3
20 9.5 8.9 8.3 7.8 7.2
12 3.0 2.8 2.6 2.4 2.2
070
15 4.4 4.0 3.8 3.5 3.3
18 6.0 5.5 5.1 4.8 4.4
24 9.7 9.1 8.5 7.9 7.3
5/30/06
Pressure Drop (psi)
Model GPM
Pressure Drop and Recommended Flow Rates
Single Speed Dual Capacity
31
ENVISION SERIES INSTALLATION MANUAL
Troubleshooting
Standard Microprocessor Controls
To check the unit control board for proper operation:
1. Disconnect thermostat wires at the control board.
2. Jumper the desired test input (Y1, Y2, W, O or G) to the R terminal to simulate a thermostat signal.
3. If control functions properly:
• Check for thermostat and eld control wiring (use the diagnostic inputs mode).
4. If control responds improperly:
• Ensure that component being controlled is functioning (compressor, blower, reversing valve, etc.).
• Ensure that wiring from control to the component is functioning (refer to the LED Denition table below and use the
diagnostic outputs mode).
• If steps above check properly, replace unit control.
LED Denitions and Diagnostics
Standard Microprocessor
DIAGNOSTIC MODES
INPUTS OUTPUTS 1 OUTPUTS 2
1 NA
6 Off
7 Off
Compressor
(On or Low)
Blower
Low
LED
Drain
NORMAL
DISPLAY MODE
Field Selection DIPS
SW2- 1 On SW2- 1 Off SW2- 1 NA SW2- 1 NA SW2-
SW2- 6 On SW2- 6 On SW2- 6 Off SW2- 6 On SW2-
SW2- 7 On SW2- 7 On SW2- 7 On SW2- 7 Off SW2-
Drain Pan Overow
Lockout
CURRENT
FAULT STATUS
Drain Pan Overow Y1
Water Flow
High
Pressure
FP Thermistor (Loop
<15º F, Well<30ºF)
Lockout
High Pressure >600
PSI Lockout
FP Thermistor (Loop
<15º F, Well<30ºF)
High Pressure >600 O Reversing Valve
Y2
Compressor
(On or High)
Blower
Medium
Blower
High
Low
Pressure,
Current
Low Pressure <40 Low Pressure <40 G Fan Aux Heat 1
Sensor
Airow
Status
DHW Limit
DHW Off
ECM2 RPM <100
RPM
Microprocessor
Malfunction
HWL Thermistor
>130ºF
DHW Pump
Switch Off
Refrigerant Systems
ECM2 RPM <100
RPM
Not Used SL1 Loop Pump 1 Aux Heat 3
HWL Thermistor
>130°F
DHW Pump Switch Off – – –
W DHW Pump Aux Heat 2
Not Used Loop Pump 2 Aux Heat 4
To maintain sealed circuit integrity, do not install service gauges unless unit operation appears abnormal. Compare the
change in temperature on the air side as well as the water side to the tables on pages 26-27. If the unit’s performance is not
within the ranges listed, and the airow and water ow are known to be correct, gauges should then be installed and superheat and subcooling numbers calculated. If superheat and subcooling are outside recommended ranges, an adjustment to
the refrigerant charge may be necessary.
Notes:
Refrigerant tests must be made with desuperheater turned “OFF”.
proper levels before servicing the refrigerant circuit.
Verify that air and water ow rates are at
32
ENVISION SERIES INSTALLATION MANUAL
Preventive Maintenance
Water Coil Maintenance
1. Keep all air out of the water. An open loop system should be checked to ensure that the well head is not allowing air to
inltrate the water line. Lines should always be airtight.
2. Keep the system under pressure at all times. It is recommended in open loop systems that the water control valve be
placed in the discharge line to prevent loss of pressure during off cycles. Closed loop systems must have positive static
pressure.
Notes: On open loop systems, if the installation is in an area with a known high mineral content (125 PPM or greater) in the
water, it is best to establish with the owner a periodic maintenance schedule so the coil can be checked regularly. Should
periodic coil cleaning be necessary, use standard coil cleaning procedures which are compatible with either the cupronickel
or copper water lines. Generally, the more water owing through the unit the less chance for scaling.
Other Maintenance
Filters
Filters must be clean to obtain maximum performance. They should be inspected monthly under normal operating condi-
tions and be replaced when necessary. Units should never be operated without a lter.
Condensate Drain
In areas where airborne bacteria produce a slime in the drain pan, it may be necessary to treat chemically to minimize
the problem. The condensate drain can pick up lint and dirt, especially with dirty lters. Inspect twice a year to avoid the
possibility of overow.
Blower Motors
Blower motors on most air handlers are equipped with sealed ball bearings and require no periodic oiling.
Desuperheater Coil
See Water Coil Maintenance section above.
Air Coil
The air coil must be cleaned to obtain maximum performance. Check once a year under normal operating conditions
and, if dirty, brush or vacuum clean. Care must be taken not to damage the aluminum ns while cleaning.
CAUTION: Fin edges are sharp.
Replacement Procedures
Obtaining Parts
When ordering service or replacement parts, refer to the model number and serial number of the unit as stamped on the
serial plate attached to the unit. If replacement parts are required, mention the date of installation of the unit and the date of
failure, along with an explanation of the malfunctions and a description of the replacement parts required.
In-Warranty Material Return
Material may not be returned except by permission of authorized warranty personnel. Contact your local distributor for
warranty return authorization and assistance.
33
ENVISION SERIES INSTALLATION MANUAL
DIMENSION VALUE DIMENSION VALUE DESCRIPTION
A 19.25 A 21.25 UNIT HEIGHT
B 22.50 B 25.50 UNIT WIDTH
C 26.50 C 31.50 UNIT DEPTH
D 1.93 D 2.21 WATER IN
E 6.93 E 7.21 WATER OUT
F 8.44 F 9.21 BRASS SERVICE VALVE (LIQUID)
G 11.55 G 12.14 BRASS SERVICE VALVE (GAS )
H 13.43 H 15.83 DESUPERHEATER IN
J 16.43 J 18.83 DESUPERHEATER OUT
K 8.55 K 7.71 LOW VOLTAGE
L 10.30 L 9.46 EXTERNAL PUMP
M 11.80 M 10.96 LINE VOLTAGE
ENVISION - NZ SPLIT DIMENSIONAL DATA
NZ 022-030 NZ 036-072
A
C
B
D
E
F
G
H
J
K
L
M
Physical Dimensions
34
Installation Notes:
ENVISION SERIES INSTALLATION MANUAL
35
Manufactured by:
WaterFurnace International, Inc.
9000 Conservation Way
Fort Wayne, IN 46809
WFI has a policy of continuous product research and
development and reserves the right to change design
and specications without notice.
©2007 WFI.
Product: Envision Series
Type: Geothermal Indoor Split Heat Pumps
Size: 2 thru 5.5 Ton Single Speed
2 thru 6 Ton Dual Capacity
Document Type: Installation Manual
Part Number: IM1592
Release Date: 06/07
Supercedes: NA
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