25HCR
COMFORTt SERIES R---22 HEAT PUMPS
SIZES 18 TO 60
1---1/2 TO 5 NOMINAL TONS
Installation Instructions
TABLE OF CONTENTS
PAGE
SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . 2
INSTALLATION RECOMMENDATIONS . . . . . . . . . . . . . 2
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 -- 10
Step 1 -- Check Equipment & Jobsite . . . . . . . . . . . . . . . 3
Step 2 -- Install on Solid Pad . . . . . . . . . . . . . . . . . . . . . . 3
Step 3 -- Clearance Requirements . . . . . . . . . . . . . . . . . . 3
Step 4 -- Operating Ambient . . . . . . . . . . . . . . . . . . . . . . 3
Step 5 -- Install TXV . . . . . . . . . . . . . . . . . . . . . . . . . 3 -- 4
Step 6 -- Check Defrost Thermostat . . . . . . . . . . . . . . . . . 4
Step 7 -- Make Piping Connections . . . . . . . . . . . . . . 4 -- 6
Step 8 -- Make Electrical Connections . . . . . . . . . . . . 6 -- 7
Step 9 -- Compressor Crankcase Heater . . . . . . . . . . . . . 7
Step 10 -- Install Electrical Accessories . . . . . . . . . . . . . . 7
Step 11 -- Start--Up . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 -- 9
Step 12 -- Check Charge . . . . . . . . . . . . . . . . . . . . . . . . . 10
Step 13 -- Final Checks . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CARE AND MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . 10
A05341
Fig. 1 --- 25HCR
NOTE: Read the entire instruction manual before starting the
installation.
INSTALLATION
STEP 1 —Check Equipment and Job Site
Unpack Unit
On rooftop applications, locate unit at least 6 in. above roof
surface.
STEP 4 —Operating Ambient
The minimum outdoor operating ambient in cooling mode is
55°F, and the maximum outdoor operating ambient in cooling
mode is 125°F. The maximum outdoor operating ambient in
heating mode is 66 °F.
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.
STEP 5 —Install TXV
NOTE: Applies to non--TXV indoor units only. If installing a
rated and approved indoor coil without a factory installed R--22
TXV, remove and replace the fixed orifice or PuronR TXV
expansion device with an R--22 TXV.
STEP 2 —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.
!
CAUTION
UNIT OPERATION HAZARD
For hurricane tie downs, contact distributor for details and PE
Certification (Professional Engineer), if required.
Failure to follow this caution may result in equipment damage
or improper operation.
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.
All indoor coil units must be installed with a hard shut off
R--22 TXV metering device.
IMPORTANT: If not factory installed, the TXV should be
mounted as close to the indoor coil as possible and in a vertical,
upright position. Avoid mounting the inlet tube vertically down.
Valve is more susceptible to malfunction due to debris if inlet
tube is facing down. A factory--approved filter drier must be
installed in the liquid line.
Roof mounted units exposed to winds above 5 mph may require
wind baffles. Consult the Service Manual -- Residential Split
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.
Installing TXV in Place of Piston
STEP 3 —Clearance Requirements
1. Pump system down to 2 psig and recover refrigerant.
When installing, allow sufficient space for airflow clearance,
wiring, refrigerant piping, and service. Allow 30--in. clearance to
service end of unit and 48 in. above unit. For proper airflow, a
6--in. clearance on 1 side of unit and 12 in. on all remaining sides
must be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot fall
directly on unit.
2. Remove hex nut from piston body. Use backup wrench on
fan coils.
3. Remove and discard factory--installed piston. Be sure
Teflon seal is in place.
4. Reinstall hex nut. Finger tighten nut plus 1/2 turn.
NOTE: If the piston is not removed from the body, TXV will
not function properly.
3/8---in. Dia. Tiedown
Knockouts in Basepan
(2) Places
!
CAUTION
EQUIPMENT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
Use a brazing shield and wrap TXV with wet cloth or
use heat sink material.
5. Install TXV on indoor coil liquid line. Sweat swivel
adapter to inlet of indoor coil and attach to TXV outlet.
Use backup wrench to avoid damage to tubing or valve.
Sweat inlet of TXV, marked “IN” to liquid line. Avoid
excessive heat which could damage valve.
View From Top
6. Install vapor elbow with equalizer adapter to suction tube
of line set and suction connection to indoor coil. Adapter
has a 1/4--in. male connector for attaching equalizer tube.
TIEDOWN KNOCKOUT LOCATIONS
UNIT BASE PAN
DIMENSIONS
A
B
C
26 X 26
31–1/2 X 31–1/2
35 X 35
9–1/8
9–1/8
9–1/8
4–7/16
6–9/16
6–9/16
21–1/4
24–11/16
28–7/16
7. Connect equalizer tube of TXV to 1/4--in. equalizer fitting
on vapor line adapter.
8. Attach TXV bulb to horizontal section of suction line
using clamps provided. Insulate bulb with field--supplied
insulation tape. See Fig. 4 for correct positioning of
sensing bulb.
A05177
Fig. 3 --- Clearance Requirements
9. Proceed with remainder of unit installation.
3
STEP 6 —Check Defrost Thermostat
10 O'CLOCK
2 O'CLOCK
Check defrost thermostat to ensure it is properly located and
securely attached. There is a liquid header with a brass distributor
and feeder tube going into outdoor coil. At the end of the one of
the feeder tubes, there is a 3/8 in. O.D. stub tube approximately 2
in. long. (See Fig. 5.) The defrost thermostat should be located on
stub tube. Note that there is only one stub tube used with liquid
header, and on most units it is the bottom circuit.
SENSING BULB
STRAP
SUCTION TUBE
8 O'CLOCK
FEEDER TUBE
STUB TUBE
4 O'CLOCK
7
7
LARGER THAN
⁄8 IN. OD
⁄
8 IN. OD & SMALLER
A81032
Fig. 4 --- Position of Sensing Bulb
Replacing TXV on Puron Indoor Coil
1. Pump system down to 2 psig and recover refrigerant.
2. Remove coil access panel and fitting panel from front of
cabinet.
3. Remove TXV support clamp using a 5/16--in. nut driver.
Save the clamp.
DEFROST
THERMOSTAT
4. Remove Puron TXV using a backup wrench on flare
connections to prevent damage to tubing.
A97517
5. Using wire cutters, cut equalizer tube off flush with vapor
tube inside cabinet.
Fig. 5 --- Defrost Thermostat Location
6. Remove bulb from vapor tube inside cabinet.
STEP 7 —Make Piping Connections
7. Braze equalizer stub--tube closed. Use protective barrier as
necessary to prevent damage to drain pan.
!
WARNING
IMPORTANT: Route the equalizer tube of R--22 TXV through
suction line connection opening in fitting panel prior to replacing
fitting panel around tubing.
PERSONAL INJURY AND ENVIRONMENTAL
HAZARD
Failure to follow this warning could result in personal
injury or death.
8. Install TXV with 3/8--in. copper tubing through small hole
in service panel. Use wrench and backup wrench, to avoid
damage to tubing or valve, to attach TXV to distributor.
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.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet, in same
location as original was when removed, using supplied
bulb clamps (nylon or copper). See Fig. 4 for correct
positioning of sensing bulb.
11. Route equalizer tube through suction connection opening
(large hole) in fitting panel and install fitting panel in
place.
12. Sweat inlet of TXV, marked IN to liquid line. Avoid
excessive heat which could damage valve.
13. Install vapor elbow with equalizer adapter to vapor line of
line set and vapor connection to indoor coil. Adapter has
a 1/4--in. male connector for attaching equalizer tube.
!
CAUTION
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
If ANY refrigerant tubing is buried, provide a 6--in. vertical
rise at service valve. Refrigerant tubing lengths up to 36--in.
may be buried without further special consideration. Do not
bury lines longer than 36 in.
14. Connect equalizer tube of TXV to 1/4--in. equalizer fitting
on vapor line adapter. Use backup wrench to prevent
damage to equalizer fitting.
!
CAUTION
15. Proceed with remainder of unit installation.
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:
S Use a brazing shield
S Wrap service valves with wet cloth or use a heat sink
material.
4
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., substantial capacity and performance losses can
occur. Following the recommendations in the Application
Guideline and Service Manual--Residential 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.
Remove plastic retainer holding outdoor piston in liquid service
valve, leaving the piston and piston retainer inside the valve.
Connect sweat/flare adapter provided, to valve. (See Fig. 6.)
Connect refrigerant tubing to fittings on outdoor unit vapor and
liquid service valves. Service valves are closed from factory and
ready for brazing. 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). Consult local code
requirements. Refrigerant tubing and indoor coil are now ready
for leak testing. This check should include all field and factory
joints.
There are no buried--line applications greater than 36 in.
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.
Outdoor Unit Connected to Factory--Approved Indoor Unit
PISTON BODY
Outdoor unit contains correct system refrigerant charge for
operation with approved ARI rated indoor unit when connected
by 15 ft. of field--supplied or factory--accessory tubing, and
factory supplied filter drier. Check refrigerant charge for
maximum efficiency.
Refrigerant Tubing and Sweat 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.
PISTON
PISTON
RETAINER
!
CAUTION
SWEAT/FLARE ADAPTER
UNIT DAMAGE HAZARD
Failure to follow this caution may result in equipment
damage or improper operation.
A05226
Fig. 6 --- Liquid Service Valve
Service valves must be wrapped in a heat--sinking
material such as a wet cloth while brazing.
Table 1—Accessory Usage
REQUIRED FOR LOW---AMBIENT AP-
PLICATIONS
REQUIRED FOR LONG LINE APPLICA-
TIONS* (Over 80 ft.)
Accessory
(Below 55 °F)
Crankcase Heater
Evaporator Freeze Thermostat
Winter Start Control
Yes
Yes
Yes
No
No
Yes
Accumulator
No
No
Compressor Start Assist Capacitor and Relay
Support Feet
Yes
Recommended
No
Yes
No
Liquid Line Solenoid Valve
See Long---Line Application Guideline
* For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft. Total Equivalent Length), refer to the Long Line Guidelines for Air
Conditioners and Heat Pumps using R---22.
Table 2—Refrigerant Connections and Recommended Liquid and Vapor Tube Diameters (in.)
LIQUID
VAPOR (up to 80 ft.*)
UNIT SIZE
Tube
Connection Diameter
Connection Diameter
Rated Tube Diameter
Diameter
018, 024
030, 036
042, 048
060
3/8
3/8
3/8
3/8
3/8
3/8
3/8
3/8
5/8
3/4
7/8
7/8
5/8
3/4
7/8
1 -1/8
Notes:
1. Tube diameters are for total equivalent lengths up to 80 ft..
2. Do not apply capillary tube or fixed orifice indoor coils to these units.
*
For Tubing Set lengths between 80 and 200 ft. horizontal or 20 ft. vertical differential (250 ft.Total Equivalent Length), refer to the Longline Guidel in e --- Air
Conditioners and Heat Pumps using R---22
5
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, makings sure wire ties on feeder
tubes are secure and tight.
STEP 8 —Make Electrical Connections
!
WARNING
ELECTRICAL SHOCK HAZARD
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.
Failure to follow this warning could result in personal
injury or death.
Do not supply power to unit with compressor terminal
box cover removed.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect unit reliability. See unit rating plate. Do
not install unit in 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.
!
CAUTION
UNIT DAMAGE HAZARD
Route Ground and Power Wires
Failure to follow this caution may result in equipment
damage or improper operation.
Remove access panel to gain access to unit wiring. Extend wires
from disconnect through power wiring hole provided and into
unit control box.
Installation of filter drier in liquid line is required.
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. 8.
Install Liquid Line Filter Drier Indoor
Refer to Fig. 7 and install filter drier as follows:
1. Braze 5 in. liquid tube to the indoor coil.
2. Wrap filter drier with damp cloth.
!
WARNING
3. Braze filter drier to 5 in. long liquid tube from step 1.
4. Connect and braze liquid refrigerant tube to the filter drier.
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 wire to ground connection in control box for
safety. Connect power wiring to contactor as shown in Fig. 8.
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
CONTACTOR
FIELD POWER
WIRING
FIELD GROUND
A05227
Fig. 7 --- Liquid Line Filter Drier
WIRING
GROUND
LUG
A94025
Fig. 8 --- Line Connections
6
Connect Control Wiring
STEP 11 —Start--Up
Route 24v control wires through control wiring grommet and
connect leads to control wiring. See Thermostat Installation
Instructions for wiring specific unit combinations. (See Fig. 9.)
Use No. 18 AWG color--coded, insulated (35°C minimum) wire.
If thermostat is located more than 100 ft. from unit, as measured
along the control voltage wires, use No. 16 AWG color--coded
wire to avoid excessive voltage drop.
!
CAUTION
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:
S Front seating service valves are equipped with Schrader
All wiring must be NEC Class 1 and must be separated from
incoming power leads.
Use furnace transformer, fan coil transformer, or accessory
transformer for control power, 24v/40va minimum.
valves.
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.
!
CAUTION
ENVIRONMENTAL HAZARD
Final Wiring Check
Failure to follow this caution may result in environmental
damage.
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.
Federal regulations require that you do not vent refrigerant to
the atmosphere. Recover during system repair or final unit
disposal.
STEP 9 —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. Refer to the Long Line Guideline--Residential Split--System
Air Conditioners and Heat Pumps.
STEP 10 —Install Electrical Accessories
Refer to the individual instructions packaged with kits or
accessories when installing.
!
CAUTION
UNIT OPERATION AND SAFETY HAZARD
Failure to follow this caution may result in minor personal
injury, equipment damage or improper operation.
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.
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) front seated (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.
7
HEAT
PUMP
TYPICAL
FAN COIL
HP THERMOSTAT
R
C
R
R
C
24 VAC HOT
24 VAC COM
HEAT STAGE 2
C
*
W2
W2
W2
*
*
E
W3
G
COOL/HEAT
STAGE 1
Y
Y
G
INDOOR FAN
O
E
RVS COOLING
O
EMERGENCY
HEAT
IF AVAILABLE
*
LEGEND
24-V FACTORY WIRING
24-V FIELD WIRING
FIELD SPLICE CONNECTION
OUTDOOR THERMOSTAT
EMERGENCY HEAT RELAY
SUPPLEMENTAL HEAT RELAY
ODT
EHR
SHR
A02325 / A97413
Fig. 9 --- Generic Wiring Diagrams
(See Thermostat Installation Instructions for specific unit combinations)
HK32EA003
Speedup
Pins
Quiet
Shift
Defrost interval
DIP switches
A05378
Fig. 10 --- Defrost Control
8
Sequence of Operation
Quiet Shift
Quiet shift is a field selectable defrost mode (factory set to OFF),
which will eliminate occasional noise that could be heard at the
start of defrost cycle and restarting of heating cycle. It is selected
by placing DIP switch 3 on defrost board (see Fig. 12) in the ON
position.
NOTE: Defrost control board is equipped with 5 minute lockout
timer that is initiated upon any interruption of power.
Turn on power to indoor and outdoor units. Transformer is
energized.
Cooling
When Quiet Shift switch is placed in ON position, and a defrost is
initiated, the following sequence of operation will occur.
Reversing valve will energize, compressor will turn off for 30
seconds, and then turn back on to complete defrost. At the start of
heating after conclusion of defrost, reversing valve will
de--energize, compressor will turn off for another 30 seconds, and
the fan will turn off for 40 seconds, before starting in the heating
mode.
On a call for cooling, thermostat makes circuits R--O, R--Y, and
R--G. Circuit R--O energizes reversing valve, switching it to
cooling position. Circuit R--Y sends low voltage through the
safeties and energizes the T1 terminal on the circuit board. If the
compressor
has been off for 5 minutes, or power has not been cycled for 5
minutes, the OF2 relay and T2 terminal will energize. This will
close the contactor, and start the outdoor fan motor and
compressor.
Defrost
The defrost control is a time/temperature control which has field
selectable settings of 30, 60, 90, or 120 minutes, factory set to
90 minutes. These settings represent the amount of time that must
pass after closure of the defrost thermostat before the defrost
sequence begins.
When the cycle is complete, R--Y is turned off, stopping the
compressor and outdoor fan. The 5 minute time guard begins
counting. Compressor will not come on again until this delay
expires. In the event of a power interruption, the time guard will
not allow another cycle for 5 minutes.
The defrost thermostat senses coil temperature throughout the
heating cycle. When the coil temperature reaches the defrost
thermostat setting of approximately 32 degrees F, it will close,
which energizes the DFT terminal and begins the defrost timing
sequence. When the DFT has been energized for the selected
time, the defrost cycle begins.
NOTE: If the indoor blower off delay is enabled, it will run up
to an additional 90 seconds to increase system efficiency.
Heating
On a call for heating, thermostat makes circuits R--Y and R--G.
Circuit R--Y sends low voltage through the safeties and energizes
the T1 terminal on the circuit board. T1 energizes the defrost
logic circuit. If the compressor has been off for 5 minutes, or
power
Defrost cycle is terminated when defrost thermostat opens, or
automatically after 10 minutes.
Defrost Speedup
has not been cycled for 5 minutes, the OF2 relay and T2 terminal
will energize. This will close the contactor, start the outdoor fan
motor and compressor.
To initiate a forced defrost, speedup pins (J1) must be shorted
with a flat head screwdriver for 5 seconds and RELEASED. If
the defrost thermostat is open, a short defrost cycle will be
observed (actual length depends on Quiet Shift switch position).
When Quiet Shift is off, only a short 30 second defrost cycle is
observed. With Quiet Shift ON, the speedup sequence is one
minute; 30 second compressor off period followed by 30 seconds
of defrost with compressor operation. When returning to heating
mode, the compressor will turn off for an additional 30 seconds
and the fan for 40 seconds.
When the cycle is complete, R--Y is turned off , stopping the
compressor and outdoor fan. The 5 minute time guard begins
counting. Compressor will not come on again until this time
delay expires. In the event of a power interruption, the time guard
will
not allow another cycle for 5 minutes.
If the defrost thermostat is closed, a complete defrost cycle is
initiated. If the Quiet Shift switch is turned on, the compressor
will be turned off for two 30 second intervals as explained
previously.
9
STEP 12 —Check Charge
Table 3—Required Liquid--Line Temperature
Liquid
Factory charge and charging method are shown on unit rating
plate. To check charge in cooling mode, refer to Cooling Only
Procedure. To check charge in heating mode, refer to Heating
Check Chart Procedure.
Pressure
at Service
Valve
Required Subcooling Temperature (°F)
Cooling Only Procedure
(PSIG)
134
141
148
156
163
171
179
187
196
205
214
223
233
243
253
264
274
285
297
309
321
331
346
359
5
10
66
15
61
20
56
71
NOTE: If subcooling charging conditions are not favorable,
charge must be weighed in accordance with unit rating plate,
±0.6 oz./ft. of 3/8--in. liquid line above or below 15 ft.,
respectively. Favorable conditions fall within the ranges given on
the charging chart on the outdoor unit plate.
74
69
64
59
77
72
67
62
80
75
70
65
83
78
73
68
This system requires charging by the subcooling method.
86
81
76
71
1. Operate unit a minimum of 10 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching an
accurate gage to service port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid line
near outdoor coil.
89
84
79
74
92
87
82
77
95
90
85
80
98
93
88
83
101
104
107
110
113
116
119
122
125
128
131
134
137
140
96
91
86
99
94
89
4. Refer to unit rating plate for required subcooling
temperature.
5. Refer to Table 3. Find the point where required subcooling
temperature intersects measured liquid service valve
pressure.
102
105
108
111
114
117
120
123
126
129
132
135
97
92
100
103
106
109
112
115
118
121
124
127
130
95
98
101
104
107
110
113
116
119
122
125
6. To obtain required subcooling temperature at a specific
liquid line pressure, add refrigerant if liquid line
temperature is higher than indicated or reclaim refrigerant
if temperature is lower. Allow a tolerance of ± 3°F.
Heating Check Chart Procedure
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.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible
equipment failure, periodic maintenance must be performed on
this equipment.
STEP 13 —Final Checks
IMPORTANT: Before leaving job, be sure to do the following:
Frequency of maintenance may vary depending upon geographic
areas, such as coastal applications. See Users Manual for
information.
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.
Printed in U.S.A.
Edition Date: 02/06
Copyright 2006 Carrier Corp. S 7310 W. Morris St. S Indianapolis, IN 46231
Catalog No: 25HCR-2SI
Replaces: 25HCR--1SI
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
10
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