null  null
25HNH5
Infinityr 15 Heat Pump with Puronr Refrigerant
2 to 4 Nominal Tons (Sizes 24-48)
Installation Instructions
NOTE: Read the entire instruction manual before starting the
installation.
SAFETY CONSIDERATIONS
Improper installation, adjustment, alteration, service, maintenance,
or use can cause explosion, fire, electrical shock, or other
conditions which may cause death, personal injury, or property
damage. Consult a qualified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use factory–authorized kits or accessories
when modifying this product. Refer to the individual instructions
packaged with the kits or accessories when installing.
Follow all safety codes. Wear safety glasses, protective clothing,
and work gloves. Use quenching cloth for brazing operations.
Have fire extinguisher available. Read these instructions
thoroughly and follow all warnings or cautions included in
literature and attached to the unit. Consult local building codes and
current editions of the National Electrical Code (NEC) NFPA 70.
In Canada, refer to current editions of the Canadian electrical code
CSA 22.1.
Recognize safety information. This is the safety–alert symbol !! .
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand these signal words; DANGER, WARNING, and
CAUTION. These words are used with the safety–alert symbol.
DANGER identifies the most serious hazards which will result in
severe personal injury or death. WARNING signifies hazards
which could result in personal injury or death. CAUTION is used
to identify unsafe practices which may result in minor personal
injury or product and property damage. NOTE is used to highlight
suggestions which will result in enhanced installation, reliability, or
operation.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Before installing, modifying, or servicing system, main
electrical disconnect switch must be in the OFF position.
There may be more than 1 disconnect switch. Lock out and
tag switch with a suitable warning label.
!
WARNING
EXPLOSION HAZARD
Failure to follow this warning could
result in death, serious personal injury,
and/or property damage.
Never use air or gases containing
oxygen for leak testing or operating
refrigerant compressors. Pressurized
mixtures of air or gases containing
oxygen can lead to an explosion.
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
1. Locate unit away from windows, patios, decks, etc. where
unit operation sound may disturb customer.
2. Ensure that vapor and liquid tube diameters are appropriate
for unit capacity.
3. Run refrigerant tubes as directly as possible by avoiding unnecessary turns and bends.
4. Leave some slack between structure and unit to absorb vibration.
5. When passing refrigerant tubes through the wall, seal opening with RTV or other pliable silicon–based caulk (see Fig.
1).
6. Avoid direct tubing contact with water pipes, duct work,
floor joists, wall studs, floors, and walls.
7. Do not suspend refrigerant tubing from joists and studs with
a rigid wire or strap which comes in direct contact with
tubing (see Fig. 1).
8. Ensure that tubing insulation is pliable and completely surrounds vapor tube.
9. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation (see Fig. 1).
10. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
OUTDOOR WALL
INDOOR WALL
CAULK
LIQUID TUBE
INSULATION
SUCTION TUBE
THROUGH THE WALL
JOIST
HANGER STRAP
(AROUND SUCTION
TUBE ONLY)
INSULATION
SUCTION TUBE
1” (25.4 mm)
MIN
LIQUID TUBE
SUSPENSION
A07588
Fig. 1 – Connecting Tubing Installation
When outdoor unit is connected to factory–approved indoor unit,
outdoor unit contains system refrigerant charge for operation with
AHRI rated indoor unit when connected by 15 ft. (4.57 m) of
field–supplied or factory accessory tubing. For proper unit
operation, check refrigerant charge using charging information
located on control box cover and/or in the Check Charge section of
this instruction.
IMPORTANT: Maximum liquid–line size is 3/8–in. OD for all
residential applications including long line.
IMPORTANT: Always install the factory–supplied liquid–line
filter drier. Obtain replacement filter driers from your distributor or
branch.
INSTALLATION
IMPORTANT: Effective January 1, 2015, all split system and
packaged air conditioners must be installed pursuant to applicable
regional efficiency standards issued by the Department of Energy.
!
CAUTION
CUT HAZARD
Failure to follow this caution may result in personal injury.
Sheet metal parts may have sharp edges or burrs. Use care and
wear appropriate protective clothing and gloves when
handling parts.
System Air Conditioners and Heat Pumps for wind baffle
construction.
NOTE: Unit must be level to within ±2° (±3/8 in./ft.) per
compressor manufacturer specifications.
Clearance Requirements
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 24 in. (610 mm)
clearance to service end of unit and 48 in. (1219.2 mm) above unit.
For proper airflow, a 6 in. (152.4 mm) clearance on 1 side of unit
and 12 in. (304.8 mm) on all remaining sides must be maintained.
Maintain a distance of 24 in. (609.6 mm) between units. Position
so water, snow, or ice from roof or eaves cannot fall directly on
unit.
Check Equipment and Job Site
Unpack Unit
3/8–in. (9.53 mm) Dia.
Tie down Knockouts in
Basepan(2) Places
25HNH5
Move to final location. Remove carton taking care not to damage
unit.
Inspect Equipment
File claim with shipping company prior to installation if shipment
is damaged or incomplete. Locate unit rating plate on unit corner
panel. It contains information needed to properly install unit.
Check rating plate to be sure unit matches job specifications.
This unit employs one louver spacer on each of the four sides to
prevent louver movement during operation. The louver spacers are
trapped between the coil surface and louver at the approximate
center of each side (See Fig. 2). This louver spacer should be
present and, if dislodged during shipment, must be reinstalled
before unit is placed into operation.
View From Top
UNIT BASE PAN
Dimension in. (mm)
31–1/2 X 31–1/2
(800 X 800)
35 X 35
(889 X 889)
TIEDOWN KNOCKOUT LOCATIONS in. (mm)
A
B
C
9–1/8 (231.8)
6–9/16 (166.7)
24–11/16 (627.1)
9–1/8 (231.8)
6–9/16 (166.7)
28–7/16 (722.3)
A05177
Fig. 3 – Tie Down Knockout Requirements
On rooftop applications, locate unit at least 6 in. (152.4 mm) above
roof surface.
Operating Ambient
The minimum outdoor operating ambient in cooling mode is
55°F/12.78_C without low ambient cooling enabled, and the
maximum outdoor operating ambient in cooling mode is
125°F/51.67_C. The maximum outdoor operating ambient in
heating mode is 66 °F/18.89_C.
Elevate Unit
!
CAUTION
UNIT OPERATION HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
A11380a
Fig. 2 – Louver Spacer Location
Install on a Solid, Level Mounting Pad
If conditions or local codes require the unit be attached to pad, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in
Fig. 3 to determine base pan size and knockout hole location.
For hurricane tie downs, contact distributor for details and PE
Certification (Professional Engineer), if required.
On rooftop applications, mount on level platform or frame. Place
unit above a load–bearing wall and isolate unit and tubing set from
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
Roof mounted units exposed to winds above 5 mph may require
wind baffles. Consult the Service Manual – Residential Split
Unit must be kept free of an accumulation of water and/or ice
in the basepan.
Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of unit. If using accessory support feet, use installation
instructions from kit for installation.
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to the unit, ensure that it is located with
the supports such that the unit is stable in all circumstances
including adverse conditions.
2
Table 1—Accessory Usage
ACCESSORY
Accumulator
Compressor Start Assist
Capacitor and Relay
REQUIRED FOR LOW–AMBIENT
COOLING APPLICATIONS
(Below 555F / 12.85C)
Standard
Crankcase Heater
Evaporator Freeze Thermostat
Isolation Relay
Liquid Line Solenoid Valve
Motor Master[ Control or
Low Ambient Switch
Support Feet
Standard
REQUIRED FOR
SEA COAST APPLICATIONS
(Within 2 miles / 3.22 km)
Standard
Yes
Yes
No
Yes
Yes
No
No
No
No
No
See Long–Line Application Guideline
No
REQUIRED FOR
LONG LINE APPLICATIONS*
Yes
(for non–Infinity systems only)
Yes
(for non–Infinity systems only)
No
Yes
(for non–Infinity systems only)
Recommended
No
No
No
Recommended
* For tubing line sets between 80 and 200 ft. (24.38 and 60.96 m) and/or 20 ft. (6.1 m) vertical differential (250 ft./ 76.2 m)Total Equivalent Length), refer to Residential Piping and
Longline Application Guideline.
WARNING
!
PERSONAL INJURY / ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury
or death.
Relieve pressure and recover all refrigerant before system
repair or final unit disposal.
Use all service ports and open all flow–control devices,
including solenoid valves.
!
CAUTION
Outdoor Unit Connected to Factory Approved
Indoor Unit
Outdoor unit contains approximate system refrigerant charge for
operation with approved AHRI rated indoor unit when connected
by 15 ft (4.57 m) of field–supplied or factory–accessory tubing,
and factory supplied filter drier. Some indoor units require
additional subcooling to achieve optimal heating performance.
Using Table 3 – Additional Subcooling Required, check refrigerant
charge for maximum efficiency
Brazing Connections
Connect vapor tube to fitting on outdoor unit vapor service valves
(see Table 2). Connect liquid tubing to adapter tube on liquid
service valve. Use refrigerant grade tubing.
!
UNIT DAMAGE HAZARD
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat–sinking material
such as a wet cloth while brazing.
Failure to follow this caution may result in equipment
damage or improper operation.
If ANY refrigerant tubing is buried, provide a 6 in. (152.4
mm) vertical rise at service valve. Refrigerant tubing lengths
up to 36 in.(914.4 mm) may be buried without further
special consideration. Do not bury lines longer than 36 in.
(914.4 mm).
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
To prevent damage to unit or service valves, observe the
following:
SUse a brazing shield.
SWrap service valves with wet cloth or use a heat sink
material.
Outdoor units may be connected to indoor section using accessory
tubing package or field–supplied refrigerant grade tubing of correct
size and condition. For tubing requirements beyond 80 ft/24.38 m,
substantial capacity and performance losses can occur. Following
the recommendations in the Long Line Guideline for Split–System
Air Conditioners and Heat Pumps will reduce these losses. Refer to
Table 1 for accessory requirements. Refer to Table 2 for field
tubing diameters.
If refrigerant tubes or indoor coil are exposed to atmosphere, they
must be evacuated to 500 microns to eliminate contamination and
moisture in the system.
CAUTION
Apply heat absorbing paste or heat sink product between service
valve and joint. Wrap service valves with a heat sinking material
such as a wet cloth.
After wrapping service valve with a wet cloth, tubing set can be
brazed to service valve using either silver bearing or non–silver
bearing brazing material. Do not use soft solder (materials which
melt below 800°F/427°C). Consult local code requirements.
NOTE: Some outdoor units contain a mechanical fitting at the
liquid distributor. This connection is not field serviceable and
should not be disturbed.
NOTE: For Liquid Service Valve − Braze lineset to adapter tube
BEFORE bolting adapter to valve. This helps prevent overheating
and damage to plastic washer or o−ring.
For Vapor Service Valve − remove valve core from schrader port
on Service Valve BEFORE brazing.
This helps prevent
overheating and damage to valve seals (refer to Fig. 4). Replace
valve core when brazing is completed.
SERVICE VALVE
VALVE CORE
Fig. 4 – Vapor Service Valve
3
A14236
25HNH5
Make Piping Connections
WARNING
!
FIRE HAZARD
Failure to following this warning could result in personal
injury, death and/or property damage.
Clean line set tube ends with emery cloth or steel brush. Remove
any grit or debris.
Insert line set tube ends into service valve tube stubs.
Apply heat absorbing paste or heat sink product between service
valve and joint. Wrap service valves with a heat sinking material
such as a wet cloth.
Braze joints using a Sil−Fos or Phos−copper alloy.
Table 2—Refrigerant Connections and Recommended Liquid
and Vapor Tube Diameters (In.)
UNIT SIZE
3/8
3/8
3/8
24
30, 36
42, 48
*
LIQUID
Connection
Tube
Diameter
Diameter
3/8
3/8
3/8
Leak Testing
Leak test all joints; indoors, outdoors, and refrigerant tubing.
Evacuate Refrigerant Tubing and Indoor Coil
5/8
3/4
7/8
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
5/8
3/4
7/8
Notes:
1. Do not apply capillary tube indoor coils to these units.
2. For Tubing Set lengths between 80 and 200 ft. (24.38 and 60.96 m) horizontal or
20 ft. (6.09 m) vertical differential 250 ft. (76.2 m) Total Equivalent Length, refer to
the Residential Piping and Longline Guideline – Air Conditioners and Heat Pumps
using Puron refrigerant.
NO Installation of Adapter Tube
Although it is a heat pump this unit has a standard AC liquid
service valve. A TXV inside the unit serves as the heating
expansion device.
CAUTION
Never use the system compressor as a vacuum pump.
Refrigerant tubes and indoor coil should be evacuated using the
recommended deep vacuum method of 500 microns. An alternate
triple evacuation method may also be used. See Service Manual
for Triple Evacuation Method.
IMPORTANT: Always break a vacuum with dry nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a vacuum of 500 microns and a vacuum gage capable of
accurately measuring this vacuum depth. The deep vacuum method
is the most positive way of assuring a system is free of air and
liquid water. (See Fig. 6. )
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Service valves must be wrapped in a heat–sinking
material such as a wet cloth while brazing.
!
CAUTION
CAUTION
!
RATED VAPOR*
Connection
Tube
Diameter
Diameter
Units are rated with 25 ft. (7.6 m) of lineset. See Product Data sheet for performance
data when using different size and length linesets.
!
A05227
Fig. 5 – Liquid Line Filter Drier
MICRONS
25HNH5
Refrigerant and oil mixture could ignite and burn as it escapes
and contacts brazing torch. Make sure the refrigerant charge is
properly removed from both the high and low sides of the
system before brazing any component or lines.
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Installation of filter drier in liquid line is required.
5000
4500
4000
3500
3000
2500
2000
1500
1000
500
LEAK IN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
0
1
2
Install Liquid Line Filter Drier Indoor
Refer to Fig. 5 and install filter drier as follows:
1. Braze 5 in. (127 mm) liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
3. Braze filter drier to 5 in. (127 mm) long liquid tube from
step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
3
4
MINUTES
5
6
7
A95424
Fig. 6 – Deep Vacuum Graph
Final Tubing Check
IMPORTANT: Check to be certain factory tubing on both indoor
and outdoor unit has not shifted during shipment. Ensure tubes are
not rubbing against each other or any sheet metal. Pay close attention
to feeder tubes, making sure wire ties on feeder tubes are secure
and tight.
4
Connect Control Wiring
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal injury
or death.
Do not supply power to unit with compressor terminal box
cover removed.
Be sure field wiring complies with local and national fire, safety,
and electrical codes, and voltage to system is within limits shown
on unit rating plate. Contact local power company for correction of
improper voltage. See unit rating plate for recommended circuit
protection device.
NOTE: Operation of unit on improper line voltage constitutes abuse
and could affect unit reliability. See unit rating plate. Do not install
system where voltage may fluctuate above or below permissible
limits.
NOTE: Use copper wire only between disconnect switch and unit.
NOTE: Install branch circuit disconnect of adequate size per NEC
to handle unit starting current. Locate disconnect within sight from
and readily accessible from unit, per Section 440–14 of NEC.
Route Ground and Power Wires
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into unit
control box.
WARNING
!
Route 24v control wires through control wiring grommet and
connect leads to control wiring. See Thermostat Installation
Instructions for wiring specific unit combinations.
Use No. 18 AWG color–coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft/30.48 m from unit, as
measured along the control voltage wires, use No. 16 AWG
color–coded, insulated wire to avoid excessive voltage drop.
All wiring must be NEC Class 2 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24v/40va minimum.
NOTE: Use of available 24v accessories may exceed the minimum
40va power requirement. Determine total transformer loading and
increase the transformer capacity or split the load with an accessory
transformer as required.
Final Wiring Check
IMPORTANT: Check factory wiring and field wire connections
to ensure terminations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
Compressor Crankcase Heater
When equipped with a crankcase heater, furnish power to heater a
minimum of 24 hr before starting unit. To furnish power to heater
only, set thermostat to OFF and close electrical disconnect to
outdoor unit.
A crankcase heater is required if refrigerant tubing is longer than
80 ft/24.38 m. Refer to the Long Line Guideline–Residential
Split–System Air Conditioners and Heat Pumps.
Install Electrical Accessories
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
The unit cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault
should occur. The ground may consist of electrical wire or
metal conduit when installed in accordance with existing
electrical codes.
Connect Ground and Power Wires
Connect ground wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 7.
Refer to the individual installation instructions packaged with kits
or accessories when installing.
Check OAT Thermistor and OCT Thermistor
Attachments
Outdoor Air Temperature (OAT) Thermistor is factory installed by
inserting the nibs on either sides of the thermistor body through a
keyhole in the bottom shelf of the control box and locking it in
place by turning it 90 degrees, such that the spherical end of a nib
faces the front of the control box.
Check to make sure the OAT is locked in place. See Fig. 8.
OAT Thermistor must be locked in
place with spherical nib end facing
towards the front of the control box
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
FIELD POWER
WIRING
FIELD GROUND
WIRING
GROUND LUG
A91056
Fig. 7 – Line Connections
A05408
Fig. 8 – Outdoor Air Thermistor (OAT) Attachment
The Outdoor Coil Temperature (OCT) Thermistor is factory
installed on the 3/8” diameter stub tube located on the coil
assembly. Check to make sure that it is securely attached with the
clip as shown in Fig. 9.
5
25HNH5
Make Electrical Connections
OCT Thermistor
must be secured
tight on stub tube.
A05409
Fig. 9 – Outdoor Coil Thermistor (OCT) Attachment
START–UP
25HNH5
!
A10096
Fig. 10 – Infinity Control Four–Wire
Connection Diagram
CAUTION
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
NOTE: Wiring must conform to NEC or local codes.
NOTE: For standard thermidistat or thermostat wiring, see
Installation Instructions for those products.
To prevent compressor damage or personal injury,
observe the following:
S Do not overcharge system with refrigerant.
S Do not operate unit in a vacuum or at negative pressure.
S Do not disable low pressure switch in scroll compressor
applications.
S Dome temperatures may be hot.
!
HP THERMOSTAT
PERSONAL INJURY HAZARD
Failure to follow this caution may result in personal
injury.
Wear safety glasses, protective clothing, and gloves when
handling refrigerant and observe the following:
SFront seating service valves are equipped with Schrader
valves.
!
24 VAC HOT
R
R
R
24 VAC COM
C
C
C
HEAT STAGE 2
CAUTION
HEAT
PUMP
TYPICAL
FAN COIL
W2 *
W2
COOL/HEAT
STAGE 1
Y
INDOOR FAN
G
RVS COOLING
O
EMERGENCY
HEAT
E
E
*
W3 *
W2
Y
G
O
* IF AVAILABLE
LEGEND
24-V FACTORY WIRING
CAUTION
24-V FIELD WIRING
FIELD SPLICE CONNECTION
ODT
ENVIRONMENTAL HAZARD
OUTDOOR THERMOSTAT
Failure to follow this caution may result in environmental
damage.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.
EHR
EMERGENCY HEAT RELAY
SHR
SUPPLEMENTAL HEAT RELAY
A02325 / A97413
Fig. 11 – Generic Wiring Diagram for Standard
Thermostat Installations
Follow these steps to properly start up system:
1. After system is evacuated, fully open liquid and vapor service valves.
2. Unit is shipped with valve stem(s) closed and caps installed.
Replace stem caps after system is opened to refrigerant flow
(back seated). Replace caps finger–tight and tighten with
wrench an additional 1/12 turn.
3. Close electrical disconnects to energize system.
4. Set room thermostat at desired temperature. Be sure set
point is below indoor ambient temperature.
5. Set room thermostat to HEAT or COOL and fan control to
ON or AUTO mode, as desired. Operate unit for 15
minutes. Check system refrigerant charge.
6
Heating Check Chart Procedure
Factory charge amount and desired subcooling are shown on unit
rating plate. Additional subcooling may be required to achieve
optimal heating performance based on the installed indoor unit.
(see Table 3).
Charging method is shown on information plate inside unit. To
properly check or adjust charge, conditions must be favorable for
subcooling charging. Favorable conditions exist when the outdoor
temperature is between 70_F and 100_F (21.11_C and 37.78_C),
and the indoor temperature is between 70_F and 80_F (21.11_C
and 26.67_C). Follow the procedure below:
Unit is factory charged for 15ft (4.57 m) of lineset. Adjust charge
by adding or removing 0.6 oz/ft of 3/8 liquid line above or below
15ft (4.57 m) respectively.
For standard refrigerant line lengths (80 ft/24.38 m or less), allow
system to operate in cooling mode at least 15 minutes. If conditions
are favorable, check system charge by subcooling method. If any
adjustment is necessary, adjust charge slowly and allow system to
operate for 15 minutes to stabilize before declaring a properly
charged system. Refer to Table 3 for additional subcooling
required.
If the indoor temperature is above 80_F (26.67_C), and the
outdoor temperature is in the favorable range, adjust system charge
by weight based on line length and allow the indoor temperature to
drop to 80_F (26.67_C) before attempting to check system charge
by subcooling method as described above.
If the indoor temperature is below 70_F (21.11_C), or the outdoor
temperature is not in the favorable range, adjust charge for line set
length above or below 15ft (4.57 m) only. Charge level should then
be appropriate for the system to achieve rated capacity. The charge
level could then be checked at another time when the both indoor
and outdoor temperatures are in a more favorable range.
NOTE: If line length is beyond 80 ft (24.38 m) or greater than
20 ft (6.10 m) vertical separation, See Long Line Guideline for
special charging requirements.
To check system operation during heating cycle, refer to the
Heating Check Chart on outdoor unit. This chart indicates whether
a correct relationship exists between system operating pressure and
air temperature entering indoor and outdoor units. If pressure and
temperature do not match on chart, system refrigerant charge may
not be correct. Do not use chart to adjust refrigerant charge.
25HNH5
Check Charge
7
Table 3—Additional Subcooling Required
Indoor Unit
024
Subcooling Delta from Rating Plate Value
OUTDOOR UNIT TONNAGE
030
036
042
048
CAP**1814A**
CNPV*1814A**
FB4CNF018+TXV
FF1ENP(018/019)
25HNH5
FX4DNF019
CAP**24**A**
––
CNP**24**A**
––
CSPH*2412A**
––
FB4CNF024+TXV
––
FF1ENP(024/025)
––
(FV4C/FE4A)NF002
––
FX4DNF025
––
––
CAP**30**A**
––
––
CNP**30**A**
––
––
CSPH*3012A**
––
––
FB4CNF030+TXV
––
––
FF1ENP030
––
––
FF1ENP031
––
––
FX4DN(B,F)031
+3
––
CAP**36**A**
––
––
CNP**36**A**
––
––
CSPH*3612A**
––
––
FB4CNF036+TXV
––
––
––
––
FF1ENP036
––
––
FF1ENP037
––
––
FX4DN(B,F)037
+5
––
(FV4C/FE4A)N(B,F)003
––
––
CAP**42**A**
––
––
CNP**4221A**
––
––
CNPV*4217A**
––
––
CSPH*4212A**
––
––
FB4CNF042+TXV
––
––
FX4DN(B,F)043
––
––
CAP**4817A**
+5
––
CAP**48(21,24)A**
+3
––
CNP**48**A**
––
––
CSPH*4812A**
––
––
FB4CNF048+TXV
––
––
+3
––
(FV4C/FE4A)N(B,F)005
+3
+3
FX4DN(B,F)049
+3
––
CAP**60**A**
+5
CNP**6024A**
––
CSPH*6012A**
+3
FB4CNF060
––
(FV4C/FE4A)NB006
+5
FX4DN(B,F)061
+5
+3
+3
8
Turn on power to indoor and outdoor units. Transformer is
energized with power supplied.
Cooling
On a call for cooling, a standard thermostat (non–communicating)
makes circuits R–O and R–Y and R–G. Circuit R–O energizes
reversing valve, switching it to cooling position. Circuit R–Y
energizes contactor, starting outdoor fan motor and compressor
circuit. R–G energizes indoor unit blower relay, starting indoor
blower motor on high speed.
When a standard thermostat (non–communicating) is satisfied, its
contacts open, de–energizing contactor and blower relay.
Compressor and motors should stop.
NOTE: If indoor unit is equipped with a time–delay relay circuit,
the indoor blower will run an additional 90 seconds to increase system
efficiency.
An amber colored STATUS light is used to display the operation
mode and fault codes as specified in the troubleshooting section.
See Table 4 for codes and definitions.
NOTE: Only one fault code will be displayed on the outdoor unit
control board (the most recent, with the highest priority).
Crankcase Heater Operation
The crankcase heater (when applicable) is energized during the off
cycle below 65_F/18.33_C.
Outdoor Fan Motor Operation
The outdoor unit control energizes outdoor fan any time the
compressor is operating (except defrost and intermittently during
low ambient cooling). The outdoor fan remains energized for 15
minutes if a pressure switch or compressor thermal protector
should open. Outdoor fan motor will continue to operate for one
minute after the compressor shuts off when the outdoor ambient is
greater than or equal to 100_F/37.78_C.
Time Delays
The unit time delays include:
Heating
S
On a call for heating a standard thermostat (non–communicating)
makes circuits R–Y and R–G. Circuit R–Y energizes contactor,
starting outdoor fan motor and compressor. Circuit R–G energizes
indoor blower relay, starting blower motor on high speed.
Should temperature continue to fall, R–W2 is made through
second–stage room thermostat. Circuit R–W2 energizes a relay,
bringing on first bank of supplemental electric heat and providing
electrical potential to second heater relay (if used). If outdoor
temperature falls below setting of outdoor thermostat (factory
installed), contacts close to complete circuit and bring on second
bank of supplemental electric heat.
When thermostat is satisfied, its contacts open, de–energizing
contactor and relay. All heaters and motors should stop after all fan
off delays.
S
S
S
S
S
HEAT PUMP SYSTEM FUNCTIONS
AND SEQUENCE OF OPERATION
The outdoor unit control system has special functions.
following is an overview of the control functions.
The
SEQUENCE OF OPERATION
Cooling & Heating Operation
This product utilizes either a standard indoor thermostat or Infinity
communicating User Interface. With a call for cooling, the outdoor
fan, reversing valve, and compressor are energized. When the
cooling demand is satisfied, the compressor and fan will shut off.
The reversing valve will remain energized until the control board
power is removed or a call for heating is initiated.
NOTE: The outdoor fan motor will continue to operate for one
minute after compressor shuts off, when the outdoor ambient is
greater than or equal to 100_F/37.78_C.
With a call for heating, the outdoor fan and compressor are
energized. The reversing valve is de–energized in the heating
mode.
S
Utility Interface
With Infinity Control
The input labeled UTIL is active only when a communicating
Infinity Control is used. This input allows a power utility device to
interrupt compressor operation during peak load periods. See Fig.
12 for wiring connections. When the utility sends a signal to shut
the system down, the User Interface will display
”CURTAILMENT ACTIVE”.
INFINITY BOARD
UTIL
R
UTILITY RELAY
Communication and Status Function Lights
Green Communications (COMM) Light
(Infinity Control only)
A green LED (COMM light) on the outdoor board (see Fig. 13)
indicates successful communication with the other system
products. The green LED will remain OFF until communications
is established. Once a valid command is received, the green LED
will turn ON continuously. If no communication is received within
2 minutes, the LED will be turned OFF until the next valid
communication.
Amber Status Light
Five minute time delay to start cooling or heating operation when there is a call from the thermostat or user interface (To bypass this feature in a non–communicating
system, momentarily short and release forced defrost
pins, in a communicating system push the UI fan and up
buttons simultaneously for approximately 10 seconds)
Five minute compressor recycle delay on return from a
brown out condition
Two minute time delay to return to standby operation
from last valid communication (with Infinity only)
One minute time delay of outdoor fan at termination of
cooling mode when outdoor ambient is greater than or
equal to 100_F/37.78_C.
Fifteen second delay at termination of defrost before the
auxiliary heat (W2) is de–energized
Twenty second delay at termination of defrost before the
outdoor fan is energized
Seventy and sixty second compressor delays when Quiet
Shift–2 enabled.
*
UTILITY SIGNAL
OPEN RELAY
* SUPPLIED BY UTILITY PROVIDER
A05410
Fig. 12 – Utility Interface
With Non–Communicating Thermostats
When the utility curtailment interface is used with a
non–communicating thermostat, the utility relay should be wired
between R and Y.
9
25HNH5
GENERAL SEQUENCE OF OPERATION
STANDARD THERMOSTAT
Low Ambient Cooling
When this unit is operating below 55_F/12.78_C outdoor
temperature, provisions must be made for low ambient operation.
Infinity Controlled low ambient cooling:
This unit is capable of low ambient cooling without a kit ONLY
when using the Infinity control. A low ambient kit is not required,
and the outdoor fan motor does not need to be replaced for Infinity
controlled low ambient operation. The Infinity Control provides
an automatic evaporator coil freeze protection algorithm that
eliminates the need for an evaporator freeze thermostat. Low
ambient cooling must be enabled in the User Interface set up. Fan
may not begin to cycle until about 40_F/4.44_C OAT. Fan will
cycle based on coil and outdoor air temperature.
Infinity controlled low ambient mode operates as follows:
25HNH5
S
S
Fan is OFF when outdoor coil temp is < (outdoor air temperature + 3_F/–16.11_C) or outdoor fan has been ON
for 30 minutes. (Fan is turned off to allow refrigerant
system to stabilize.)
Fan is ON when outdoor coil temp > (outdoor air temperature + 25_F/–3.89_C) or outdoor coil temp >
80_F/26.67_C or if outdoor fan has been OFF for 30
minutes. (Fan is turned on to allow refrigerant system
to stabilize.)
S
Low pressure switch is ignored for first 3 minutes during
low ambient start up. After 3 minutes, if LPS trips, then
outdoor fan motor is turned off for 10 minutes, with the
compressor running. If LPS closes within 10 minutes then
cooling continues with the outdoor fan cycling per the
coil temperature routine listed above for the remainder of
the cooling cycle. If the LPS does not close within 10
minutes, then the normal LPS trip response (shut down
cooling operation and generate LPS trip error) will occur.
Standard Thermostat low ambient cooling mode:
A Low Ambient Pressure Switch kit, Evaporator Freeze
Thermostat and Isolation Relay must be installed for low ambient
operation in standard thermostat mode. The fan motor is a
ball–bearing type and does not need to be changed. A crankcase
heater must be installed. See Product Data for part numbers on
appropriate unit size and series units.
DEFROST
This control offers 4 possible defrost interval times: 30, 60, 90 or
120 minutes. These are selected by dip switches on the unit control
board, or in the Infinity control (if used). The Infinity Control
selection overrides the control board dip switch settings.
Auto defrost is available with Infinity communicating control only
and it must be enabled in the User Interface. Auto defrost adjusts
the defrost interval time based on the last defrost time as follows:
S
When defrost time is < 3 minutes, the next defrost
interval = 120 minutes
S
When defrost time is 3–5 minutes, the next defrost
interval = 90 minutes
S
When defrost time is 5–7 minutes, the next defrost
interval = 60 minutes
S
When defrost time is > 7 minutes, the next defrost
interval = 30 minutes
The control board accumulates compressor run time. As the
accumulated run time approaches the selected defrost interval time,
the control board monitors the coil temperature sensor for a defrost
demand. If a defrost demand exists, a defrost cycle will be initiated
at the end of the selected time interval. A defrost demand exists
when the coil temperature is at or below 32_F/0_C for 4 minutes
during the interval.
The defrost cycle is terminated when the coil temperature reaches
65_F/18.33_C or 10 minutes has passed.
If the coil temperature does not reach 32_F/0_C within the interval,
the interval timer will be reset and start over.
NOTE:
S
Upon initial power up the first defrost interval is defaulted
to 30 minutes. Remaining intervals are at selected times.
S
Defrost is only allowed to occur below 50_F/10_C outdoor
ambient temperature.
Defrost Hold
In a non–communicating system, if the thermostat becomes
satisfied before the defrost cycle is terminated, the control will
”hold” in defrost mode and finish the defrost cycle on the next call
for heat. Defrost hold is not needed in a communicating system
because the User Interface will complete the defrost cycle before
shutting down the system.
Forced Defrost
Forced defrost can be initiated manually in a non–communicating
system, or by communicated command from a User Interface. The
board contains a 2–pin header labeled FORCED DEFROST (see
Fig. 13). To initiate a forced defrost:
S Manually, short FORCED DEFROST pins for 5
seconds then release
S If coil temp is at defrost temp of 32_F/0_C, and outdoor
air temperature is below 50_F/10_C, a full defrost sequence will occur
S
S
If the coil temp or outdoor air temperature do not meet
the above requirements, an abbreviated 30 second defrost will occur
The Quiet Shift–2 compressor on/off delays, as described
below, will be included in a forced defrost if Quiet
Shift–2 is enabled.
QUIET SHIFT–2
Quiet Shift–2 is a field selectable defrost mode which may
eliminate occasional noise that could be heard at the start and finish
of the defrost cycle.
On a non–communicating system, this feature must be enabled by
selecting the 3rd position of the 3–position dip switch on the
outdoor control board. For communicating systems, it must be
enabled at the User Interface. When activated, the following
sequence of operation occurs: Defrost Initiation – the compressor
is de–energized for 70 seconds. During this 70 second compressor
off time, the reversing valve will be energized. Once the 70 second
compressor off time has been reached, the compressor will be
energized then the outdoor fan will be de–energized at which time
the normal defrost cycle begins. Defrost Termination – the
outdoor fan will be energized shortly before the compressor is
de–energized for 60 seconds. During the compressor 60 second off
time, the reversing valve will be de–energized. Once the 60 second
compressor off time has been completed, the compressor will be
energized at which time the system will be in normal heat mode.
10
LIQUID LINE SOLENOID ACCESSORY
Field Connections
In heat pump long line applications, a liquid line solenoid is
required to control refrigerant migration in the heating mode. The
solenoid should be installed near the outdoor unit with the arrow
facing the outdoor unit. This is the direction of flow control. See
Long Line Application Guideline for details.
Accessory Liquid Solenoid with Infinity Communicating Control:
When using the Infinity Control, a liquid line solenoid output
labeled LS is provided. Connect the solenoid as shown in the
wiring label diagram. This is a 24vac output that is energized
whenever the compressor is energized. It closes in the
compressor–off mode to prevent refrigerant migration into the unit
through the liquid line.
Accessory Liquid Solenoid with Non–Communicating
Thermostat: The liquid solenoid is connected to the Y and C
terminal connections.
The liquid solenoid closes in the
compressor–off mode to prevent refrigerant migration into the unit
through the liquid line.
When using Infinity communicating control, 4 field wires are
required to be connected to the factory wires already wired to the
ABCD terminal (see Fig. 13). Unit as provided by manufacturer is
set up for Infinity communicating control.
When used with a standard non–communicating thermostat,5 field
wires are required to be connected to R, Y, W2, O and C.
Disconnect factory provided wires from A, B, C, and D terminals.
Using factory provided wires, connect to R, Y, W2, O and C
terminals on the control board. Connect field 24V wires to factory
provided wires now connected to R, Y, W2, O and C and cap both
sides or remove unused factory provided wires.
On Infinity only, the 24vac LS (liquid solenoid) output terminal is
energized for the liquid solenoid accessory. the connection is
located at the side of the control board just below the ABCD
Infinity connector.
The compressor is protected by an internal pressure relief (IPR)
which relieves discharge gas into the compressor shell when
differential between suction and discharge pressure exceeds
550–625 psig. The compressor is also protected by an internal
overload attached to motor windings.
MAJOR COMPONENTS
Control Board
The Heat Pump control board controls the following functions:
S Compressor contactor operation
S Outdoor fan motor operation
S Reversing valve operation
S Defrost operation
S Compressor external protection
S Pressure switch monitoring
S Time delays
COMM
STATUS
}
}
Outdoor Air Temp
(OAT)
Outdoor Coil Temp
(OCT)
Fig. 13 – Control Board
11
A12132
25HNH5
Compressor Internal Relief
TROUBLESHOOTING
Systems Communication Failure
If communication between User Interface (UI), and condensing
unit is lost, the outdoor control will flash the appropriate fault
code. (See Table 4) Check the wiring to the UI, indoor and
outdoor units.
25HNH5
Pressure Switch Protection
The outdoor unit is equipped with high– and low–pressure
switches. If the control senses the opening of a high or
low–pressure switch, it will de–energize the compressor contactor,
keep the outdoor fan operating for 15 minutes and display the
appropriate fault code. (See table 4)
After a 15 minute delay, if there is still a call for cooling, and the
LPS or HPS is reset, the compressor contactor is energized. If the
LPS or HPS has not closed after a 15 minute delay, the outdoor fan
is turned off. If the open switch closes anytime after the 15–minute
delay, then the unit will resume operation with a call for cooling.
If the LPS or HPS trips for five consecutive cycles, then unit
operation is locked out for 4 hours and the appropriate fault code
(See Table 4) is displayed.
In the event of a high–pressure switch trip or high–pressure
lockout, check the refrigerant charge, outdoor fan operation and
outdoor coil (in cooling) for airflow restrictions, or indoor airflow
in heating.
In the event of a low–pressure switch trip or low–pressure lockout,
check the refrigerant charge and indoor airflow (cooling) and
outdoor fan operation and outdoor coil in heating.
Control Fault
If the outdoor unit control board has failed, the control will flash
the appropriate fault code. (See Table 4) The control board should
be replaced.
If the thermal cutout trips for three consecutive cycles, then unit
operation is locked out for 4 hours and the appropriate fault code
(See Table 4) is displayed.
Contactor Shorted Detection
If there is compressor voltage sensed when there is no demand for
compressor operation, the contactor may be stuck closed. The
control will flash the appropriate fault code. Check the contactor
and control box wiring.
No 230V at Compressor
If the compressor voltage is not sensed when the compressor
should be starting, The contactor may be stuck open or the unit
disconnect or circuit breaker may be open. The control will flash
the appropriate fault code. Check the contactor, unit disconnect or
circuit breaker and control box wiring.
Temperature Thermistors
Thermistors are electronic devices which sense temperature. As the
temperature increases, the resistance decreases. Thermistors are
used to sense outdoor air (OAT) and coil temperature (OCT).
Refer to Fig. 14 for resistance values versus temperature.
If the outdoor air or coil thermistor should fail, the control will
flash the appropriate fault code. (See Table 4)
IMPORTANT: The outdoor air thermistor and coil thermistor are
factory mounted in the correct locations. Do not re–locate thermistor
sensors.
Thermistor Sensor Comparison
The control continuously monitors and compares the outdoor air
temperature sensor and outdoor coil temperature sensor to ensure
proper operating conditions. The comparison is
S
24V Brown Out Protection
If the control voltage is less than 15.5volts for at least 4 seconds,
the compressor contactor and fan relay are de–energized.
Compressor and fan operation are not allowed until control voltage
is a minimum of 17.5volts. The control will flash the appropriate
fault code. (See Table 4) Verify the control voltage is in the
allowable range of 18–30volts.
Compressor Voltage Sensing
The input terminals labeled VR and VS on the control board (see
Fig. 13) are used to detect compressor voltage status, and alert the
user of potential problems. The control continuously monitors the
high voltage on the run capacitor of the compressor motor. Voltage
should be present any time the compressor contactor is energized,
and voltage should not be present when the contactor is
de–energized.
Compressor Thermal Cutout or Loss of 230V
Power
If the control senses the compressor voltage after start–up, and is
then absent for 10 consecutive seconds while cooling demand
exists, it will de–energize the compressor contactor, keep the
outdoor fan operating for 15 minutes (if 230v power present) and
display the appropriate fault code. (See Table 4) Possible causes are
compressor internal overload trip or loss of high voltage (230V) to
compressor without loss of control voltage.
After a 15 minute delay, if there is still a call for cooling, the
compressor contactor is energized. If the thermal protector has not
re–set, the outdoor fan is turned off. If the call for cooling
continues, the control will energize the compressor contactor every
15 minutes. If the thermal protector closes, (at the next 15 minute
interval check), the unit will resume operation.
In cooling if the outdoor air sensor indicates ≥
10_F/–12.22_C warmer than the coil sensor (or) the outdoor air sensor indicates ≥20_F/–6.67_C cooler than the
coil sensor, the sensors are out of range.
S
In heating if the outdoor air sensor indicates ≥35_F/1.67_C
warmer than the coil sensor (or) the outdoor air sensor
indicates ≥10_F/–12.22_C cooler than the coil sensor, the
sensors are out of range.
If the sensors are out of range, the control will flash the appropriate
fault code. (See Table 4 )
The thermistor comparison is not performed during low ambient
cooling or defrost operation.
Failed Thermistor Default Operation
Factory defaults have been provided in the event of failure of
outdoor air thermistor and/or coil thermistor.
If the OAT sensor should fail, low ambient cooling will not be
allowed and the one–minute outdoor fan off delay will not occur.
Defrost will be initiated based on coil temperature and time.
If the OCT sensor should fail, low ambient cooling will not be
allowed. Defrost will occur at each time interval during heating
operation, but will terminate after 5 minutes.
If there is a thermistor out of range error, defrost will occur at each
time interval during heating operation, but will terminate after 5
minutes.
Thermistor Curve: The resistance vs. temperature chart shown in
Fig. 14 enables the technician to check the outdoor air and outdoor
coil thermistors for proper resistance. Unplug the thermistor
assembly from the circuit board and measure resistance across each
thermistor. For example, if the outdoor temperature is
60_F/15.56_C, the resistance reading across the outdoor air
thermistor should be around 16,000 Ohms.
12
Status Codes
THERMISTOR CURVE
90
RESISTANCE (KOHMS)
80
70
60
50
40
30
20
10
0
0
(-17.77)
20
(-6.67)
40
(4.44)
60
(15.56)
80
(26.67)
100
(37.78)
120
(48.89)
TEMPERATURE °F (°C)
Table 4 shows the status codes flashed by the amber status light.
Most system problems can be diagnosed by reading the status code
as flashed by the amber status light on the control board.
The codes are flashed by a series of short and long flashes of the
status light. The short flashes indicate the first digit in the status
code, followed by long flashes indicating the second digit of the
error code. The short flash is 0.25 second ON and the long flash is
1.0 second ON. Time between flashes is 0.25 second. Time
between short flash and first long flash is 1.0 second. Time
between code repeating is 2.5 seconds with LED OFF.
Count the number of short and long flashes to determine the
appropriate flash code. Table 4 gives possible causes and actions
related to each error.
Example: 3 short flashes followed by 2 long flashes indicates a 32
code. Table 4 shows this to be low pressure switch open.
A08054
Table 4—Status Codes
OPERATION
FAULT
AMBER LED
FLASH CODE
Standby – no call for
unit operation
None
On solid, no
flash
Normal operation
Cool/Heat Operation
None
1, pause
Normal operation
System Communica­
tions Failure
16
Communication with user interface lost. Check wiring to UI, indoor
and outdoor units
High Pressure Switch
Open
31
High pressure switch trip. Check refrigerant charge, outdoor fan
operation and coils for airflow restrictions.
Low Pressure Switch
Open
32
Low pressure switch trip. Check refrigerant charge and indoor air
flow
Control Fault
45
Outdoor unit control board has failed. Control board needs to be
replaced.
46
The control voltage is less than 15.5v for at least 4 seconds. Com­
pressor and fan operation not allowed until control voltage is a mini­
mum of 17.5v. Verify control voltage.
Outdoor Air Temp
Sensor Fault
53
Outdoor air sensor not reading or out of range. Ohm out sensor
and check wiring
Outdoor Coil Sensor
Fault
55
Coil sensor not reading or out of range. Ohm out sensor and check
wiring
Thermistors out of
range
56
Improper relationship between coil sensor and outdoor air sensor.
Ohm out sensors and check wiring.
Thermal Cutout
72
Compressor voltage sensed after start–up, then absent for 10 con­
secutive seconds while cooling demand exists. Possible causes are
internal compressor overload trip or loss of high voltage to com­
pressor without loss of control voltage.
Contactor Shorted
73
Compressor voltage sensed when no demand for compressor op­
eration exists. Contactor may be stuck closed or there is a wiring
error.
No 230V at Compres­
sor
74
Compressor voltage not sensed when compressor should be start­
ing. Disconnect may be open or contactor may be stuck open or
there is a wiring error.
Thermal Lockout
82
Thermal cutout occurs in three consecutive cycles. Unit operation
locked out for 4 hours or until 24v power recycled.
Low Pressure Lock­
out
83
Low pressure switch trip has occurred during 5 consecutive cycles.
Unit operation locked out for 4 hours or until 24v power recycled.
High Pressure Lock­
out
84
High pressure switch trip has occurred during 5 consecutive cycles.
Unit operation locked out for 4 hours or until 24v power recycled.
Brown Out
(24 v)
POSSIBLE CAUSE AND ACTION
13
25HNH5
Fig. 14 – Resistance vs. Temperature Chart
FINAL CHECKS
CARE AND MAINTENANCE
IMPORTANT: Before leaving job, be sure to do the following:
1. Ensure that all wiring is routed away from tubing and sheet
metal edges to prevent rub–through or wire pinching.
2. Ensure that all wiring and tubing is secure in unit before
adding panels and covers. Securely fasten all panels and
covers.
3. Tighten service valve stem caps to 1/12–turn past finger
tight.
4. Leave Users Manual with owner. Explain system operation
and periodic maintenance requirements outlined in manual.
5. Fill out Dealer Installation Checklist and place in customer
file.
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on this
equipment.
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications. See Users Manual for
information.
25HNH5
PURONR (R–410A) QUICK REFERENCE GUIDE
S Puron refrigerant operates at 50–70 percent higher pressures than R–22. Be sure that servicing equipment and replacement
components are designed to operate with Puron
S Puron refrigerant cylinders are rose colored.
S Recovery cylinder service pressure rating must be 400 psig, DOT 4BA400 or DOT BW400.
S Puron systems should be charged with liquid refrigerant. Use a commercial type metering device in the manifold hose when charging
into suction line with compressor operating
S Manifold sets should be 700 psig high side and 180 psig low side with 550 psig low–side retard.
S Use hoses with 700 psig service pressure rating.
S Leak detectors should be designed to detect HFC refrigerant.
S Puron, as with other HFCs, is only compatible with POE oils.
S Vacuum pumps will not remove moisture from oil.
S Do not use liquid–line filter driers with rated working pressures less than 600 psig.
S Do not leave Puron suction line filter driers in line longer than 72 hours.
S Do not install a suction–line filter drier in liquid line.
S POE oils absorb moisture rapidly. Do not expose oil to atmosphere.
S POE oils may cause damage to certain plastics and roofing materials.
S Wrap all filter driers and service valves with wet cloth when brazing.
S A factory approved liquid–line filter drier is required on every unit.
S Do NOT use an R–22 TXV.
S If indoor unit is equipped with an R–22 TXV or piston metering device, it must be changed to a hard shutoff Puron TXV.
S Never open system to atmosphere while it is under a vacuum.
S When system must be opened for service, recover refrigerant, evacuate then break vacuum with dry nitrogen and replace filter driers.
Evacuate to 500 microns prior to recharging.
S Do not vent Puron into the atmosphere.
S Do not use capillary tube coils.
S Observe all warnings, cautions, and bold text.
S All indoor coils must be installed with a hard shutoff Puron TXV metering device.
Copyright 2015 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231
Edition Date: 03/15
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
Catalog No: 25HNH–7SI
Replaces: 25HNH–6SI
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