Carrier 38YDB024 SERIES300 User Manual HEAT PUMP Manuals And Guides L0411018

CARRIER Air conditioner/heat pump(outside unit) Manual L0411018 CARRIER Air conditioner/heat pump(outside unit) Owner's Manual, CARRIER Air conditioner/heat pump(outside unit) installation guides

User Manual: Carrier 38YDB024 SERIES300 38YDB024 SERIES300 CARRIER HEAT PUMP - Manuals and Guides View the owners manual for your CARRIER HEAT PUMP #38YDB024SERIES300. Home:Heating & Cooling Parts:Carrier Parts:Carrier HEAT PUMP Manual

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HEATING & COOUNG
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38YDB
WeatherMaker TMTwo-Speed Split System
Heat Pump with Puron® Refrigerant
Installation and Start-Up Instructions
NOTE: Read the entire instruction manual before starting the
installation.
This symbol _ indicates a change since the last issue.
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 qnalified installer, service agency, or your
distributor or branch for information or assistance. The qualified
installer or agency must use _actory-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 thor-
oughly and follow all warnings or cautions included in literature
and attached to the unit. Consult local building codes and National
Electrical Code (NEC) for special requirements.
Recognize safety information. This is the safety-alert symbol z_ •
When you see this symbol on the unit and in instructions or
manuals, be alert to the potential for personal injury.
Understand the signal words DANGER, WARNING, CAUTION,
and NOTE. 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
would 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.
¥!I K'JI-IFtIII _[_
Before installing, modifying, or servicing system, main elec-
trical 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. Electrical shock can
cause personal injury or death.
Puron_; Refrigerant systems operate at higher pressures than
standard R-22 systems. Be certain that service equipment is
rated for R-410A. Some R-22 service equipment may not be
acceptable. Check with your distributor.
INSTALLATION RECOMMENDATIONS
NOTE: In some cases noise in the living area has been traced to
gas pulsations from improper installation of equipment.
i. Locate unit away from windows, patios, decks, etc. where unit
operation sound may disturb customer.
Fig. 1--Model 38YDB
A98516
2. Ensure that vapor and liqnid tube diameters are appropriate to
capacity of unit.
3. Run refrigerant tubes as directly as possible by avoiding
unnecessary tunas and bends.
4. When passing refrigerant tubes through the wall, seal opening
with RTV or other pliable silicon-based caulk. (See Fig. 2.)
5. Avoid direct tubing contact with water pipes, duct work, floor
joists, wall studs, floors, and walls, and brick.
6. Do not suspend refrigerant tubing from joists and studs with a
rigid wire or strap which comes in direct contact with tubing.
(See Fig. 2.)
7. When necessary, use hanger straps which are 1 in. wide and
conform to shape of tubing insulation. (See Fig. 2.)
8. Isolate hanger straps from insulation by using metal sleeves
bent to conform to shape of insulation.
9. Ensure that tubing insulation is pliable and completely sur-
rounds vapor tube.
Outdoor unit contains system refrigerant charge for operation with
indoor unit of the same size when connected by 15 ft of
field-supplied or factory accessory tubing. For proper unit opera-
tion, check refrigerant charge using charging information located
on control box cover or in the Check Charge section of this
instruction.
IMPORTANT: Maxinmm liquid-line size is 3/8 in. O.D. for all
residential applications.
IMPORTANT: Only install the factory-supplied Puron,_,P_ heat
pump (bi-flow) liquid line filter &ier. Obtain replacement filter
driers from your local distributor.
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
PC 101 Catatog No. 533-80088 Printed in USA Form 38YDB-5Sl Pg 1 2-03 Replaces: 38YDB-4Sl
NOTE: Avoid contact between tubing and structure
F OUTDOOR WALL_ INDOOR WALL7
CAULK
[!_/_ (---__F LIQUID TUBE
_N ON_!A VAPOR TUBE
SULATI
THROUGH THE WALL
HANGER STRAP--- x
(AROUNDVAPOR '_ --
TUBE_,
_...,_JOIST
i] _--INSULATION
VAPOR TUBE
1"M,N.-----I L LIQUID TUBE
SUSPENSION
A94028
Fig. 2--Connecting Tubing Installation
INSTALLATION
Step l--Check Equipment and Job Site
UNPACK UNIT
Move to final location. Remove carton, taking care not to dmnage
unit.
INSPECT EQUIPMENT
File claim with shipping company prior to installation if shipment
is damaged or incomplete.
Step 2--Install on a Solid, Level Mounting Pad
It"conditions 02"local codes require the unit be attached to pact, tie
down bolts should be used and fastened through knockouts
provided in unit base pan. Refer to unit mounting pattern in Fig. 3
to detemfine base pan size and knockout hole location.
On rooftop applications, mount on level platform or frame. Place
unit above a load-bearing wall and isolate unit and tubing set fi'om
structure. Arrange supporting members to adequately support unit
and minimize transmission of vibration to building. Consult local
codes governing rooftop applications.
3/8-1N DIA TIEDOWN
KNOCKOUTS IN BASEPAN
(2) PLACES
VIEW FROM TOP 3/16"
A97548
MINIMUM TIEDOWN KNOCKOUT
MOUNTING PAD
UNIT SIZE DIMENSIONS LOCATIONS
Support Feet Snow Stand A B
024 19 X 24 26 X 32 2-!3/16 6-15/16
036-060 26 X 32 3! X 35 4 9-3/4
Fig. 3--Mounting Unit to Pad
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 maxinmm outdoor operating ambient in cooling mode is
125°F.
Step 5--Elevate Unit
Accumulation of water and ice in base pan may cause
equipment damage.
Elevate unit per local climate and code requirements to provide
clearance above estimated snowfall level and ensure adequate
drainage of the unit. Fig. 4 shows unit with accessory support feet
installed. Use accessory snow stand in areas where prolonged
freezing temperatures are encountered. Refer to separate Installa-
tion Instructions packaged with accessories.
Do not allow POE lubricant to come into contact with roofing
material. POE may deteriorate certain types of synthetic
roofing.
NOTE: Unit must be level to within ±2 ° (±3/8 in.ift).
Step 3--Clearance Requirements
When installing, allow sufficient space fbr 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 nmst
be maintained. Maintain a distance of 24 in. between units.
Position so water, snow, or ice from roof or eaves cannot Pall
directly on unit. Fig. 4_Accessory Support Feet
A98533
SENSING
BULB
EQUALIZER
THERMOSTATIC
EXPANSION
VALVE
Fig. 5--TXV Installed
Step 6--Check Indoor Expansion Device
A91277
For proper unit operation and reliability, units must be
installed with balance port hard shutoff TXV specifically
designed to operate with Puron(P_ two-speed unit. Do not
install with evaporator coils having capillary robe metering
devices.
The 38YDB037 unit includes a factory supplied TXV kit. No other
size unit includes factory supplied TXV kit.
FURNACE (:OILS
Puron'_ furnace coils come _actory equipped with bi-flow, hard
shutoff TXVs specifically designed for Puron(P_ two-speed units.
No changeout is required.
Remove existing AccuRater_ piston from indoor coil and install
field accessory TXV.
IMPORTANT: 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. A _actory-supplied or
approved filter &ier must be installed in the liquid line.
Install TXV kit to indoor coil as follows:
Installing TXV in Place of Piston
i. Ensure coil has not been exposed to atmospheric pressure for
more than 15 minutes.
2. Remove indoor coil inlet robe at piston body inlet. Use
back-up wrench to prevent damage.
3. Remove piston retainer, being careful not to damage sealing
surl_ace of O-ring.
4. Remove and discard _actory-installed piston. (Replace retainer
if O-ring is damaged.)
5. Reinstall piston retainer in piston body.
6. Replace indoor coil inlet tube. Use back-up wrench to prevent
damage.
r.,l [_
To prevent damage to the unit, use a brazing shield and wrap
TXV with wet cloth.
7. Sweat swivel adapter (See Fig. 6D) to inlet of indoor coil and
attach to TXV (See Fig. 6A) 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.
8. Install vapor elbow (See Fig. 6B) with equalizer adapter to
suction tube of line set and suction connection to indoor coil.
Adapter has a 1/4-in. male flare connector for attaching
equalizer robe.
9. Connect equalizer tube of TXV to 1/4-in. equalizer fitting on
vapor line adapter.
10. Attach TXV bulb to horizontal section of suction line using
bulb strap provided. (See Fig. 6C.) Insulate bulb with factory-
supplied insulation tape (See Fig. 6E). See Fig. 7 for correct
positioning of sensing bulb.
11. Proceed with remainder of unit installation.
FAN COILS
Indoor unit (_an coil) comes fiactory equipped with a bi-flow
balance port hard shut-off TXV specifically designed for Puron(P_
two-speed units. Changeout is not required.
To obtain efficiency rating fbr 38YDB037 with FV4ANB006,
fancoil TXV must be replaced with factory supplied TXV.
Replacing R-22 TXV or Non-Balance Port Puron(r_" TXV
i. Remove any existing refrigerant and ensure coil has not been
exposed to atmospheric pressure fbr more than 15 minutes.
2. Remove coil access panel and fitting door fi'om cabinet.
3. Remove and save TXV support clamp using a 5/16-in. nut
driver.
4. Remove TXV using a backup wrench on flare connections to
prevent damage to mbing.
5. Using wire cutters, cut equalizer robe off flush with vapor tube
inside cabinet.
6. Remove bulb fi'om vapor tube inside cabinet.
7. Braze equalizer stub-tube closed. Use protective barrier as
necessary to prevent damage to drain pan.
IMPORTANT: Route the equalizer tube of approved Puron(P_
TXV through suction line connection opening in fitting door prior
to replacing fitting panel around tubing.
8. Install TXV (Fig. 6A) with 3/8-in. copper inlet tube through
small hole in service panel. Use wrench and backup wrench,
to avoid damage to tubing valve.
9. Reinstall TXV support clamp (removed in item 3).
10. Attach TXV bulb to vapor tube inside cabinet in same location
as original was removed fi'om using supplied bulb strap (See
Fig. 6C). Insulate bulb with _aetory-supplied insulation tape
(See Fig. 6E). See Fig. 7 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 (See Fig. 6B) with equalizer adapter to
vapor line of line set and vapor connection to indoor coil.
Adapter has a 1/4-in. male flare connector for attaching
equalizer robe. (See Fig. 6B.)
14. Connect eqnalizer tube of TXV to 1/4-in. equalizer fitting on
vapor line adapter. Use backup wrench to prevent damage to
equalizer fitting.
15. Proceed with remainder of unit installation.
LONG-LINE APPLICATIONS, INSTALL LIQUID-LINE
SOLENOID VALVE (LSV)
For reliigerant piping arrangements with equivalent lengths
greater than 50 ft or when elevation difference between indoor
and.or outdoor unit is greater than ± 20 ft, follow all requirements
c
BULB
INSULATION
TAPE
A01418
Fig. 6--TXV Kit Contents
of the Long-Line Guideline section in the Application Guideline
and Service Manual_ir Conditioners and Heat Pumps Using
Puron,_.R)Refrigerant. If required by Long-Line Application Guide-
line, install LSV kit P.N KHALS0401LLS specifically designed
for Puron(R_ Heat Pump. LSV should be installed between filter
drier and indoor coil as close as possible to outdoor unit (within 2
feet). (See Fig. 13 for wiring diagram.) Follow the Installation
Instructions included with accessory kit.
IMPORTANT: Flow arrow nmst point toward outdoor unit.
Step 7--Make Piping Connections
Relieve pressure and recover all refrigerant before system
repair or final unit disposal to avoid personal injury or death.
Use all service ports and open all flow-control devices,
including solenoid valves.
r:l ['_lliiIoIll
Do not leave system open to atmosphere any longer than
minimum required for installation. POE oil in compressor is
extremely susceptible to moisture absorption. Always keep
ends of tubing sealed during installation.
¥:I [,.1._luijl[ol'd
If ANY refrigerant tubing is buried, provide a 6 in. vertical
rise at service valve. Rel_dgerant tubing lengths up to 36 in.
may be buried without further special consideration. Do NOT
bury lines for lengths over 36 in.
Outdoor units may be connected to indoor section using accessory
tubing package or field-supplied refi'igerant grade tubing of correct
size and condition. Tubing diameters listed in Table 1 are adequate
for equivalent lengths up to 50 It. For tubing requirements beyond
50 ft, substantial capacity and performance losses will occur.
Follow the recommendations in the Application Guideline and
Service Manual Air Conditioners and Heat Pumps Using Pu-
ron_ Refrigerant to minimize losses.
Refer to Table 1 for field tubing diameters. Refer to Table 2for
accessory requirements.
SENSING BULB
80ICLOCK 4 O'CLOCK
A00399
Fig. 7--Positioning of Sensing Bulb
Table 1--Refrigerant Connections and
Recommended Liquid and Vapor Tube Diameters
(In.)
UNIT
SIZE
024
036
037,048
060
Notes:
LIQUID VAPOR
Connection Tube Connection Tube
Diameter Diameter Diameter Diameter
3/8 3/8 5/8 5/8
3/8 3/8 3/4 3/4
3/8 3/8 7/8 7/8
3/8 3/8 7/8 1-1/8
VAPOR (LONG-LINE)
Connection Tube
Diameter Diameter
5/8 3/4
3/4 7/8
7/8 7/8
7/8 1-1/8
1. Tube diameters are for lengths up to 50 equivalent ft and/or 20 ft vertical
differential
2. Do not increase or decrease tubing sizes.
3. If required by local codes, Pressure Guard TM kit is available See Product
Data Digest for part numbers.
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 !EXIT CONNECTED TO FACTORY-APPROVED
INDOOR UNIT
These outdoor units are carefully evaluated and listed with specific
indoor coils for proper system perfomlanee.
IMPORTANT: Do not apply to indoor coils that are not factory
approved combinations.
IMPORTANT: For 036 size units matched with the
FV.40FKiFK005 or the FVi40FKiFK006, or lbr the 38YDB048
used with the FVi40FKiFK006, a piston change is required. Refer
to the KHAPX0201CPA Installation Instructions for details.
INSTALL ADAPTER TUBE
i. Remove plastic retainer holding outdoor piston in liquid line
service valve.
2. Check to be sure outdoor piston is properly installed in liquid
line service valve.
3. Locate plastic bag taped to unit containing adapter tube.
4. Remove Teflon washer fi'om bag and install on open end of
liquid service valve.
5. Remove adapter tube from bag and connect threaded nut to
liqnid service valve. Tighten nut finger tight and then with
wrench an additional i/2 tum (15 ft-lb). DO NOT OVER-
TIGHTEN!
REFRIGERANT TUBING AND FILTER DRIER
Connect vapor tubing to fittings on outdoor unit vapor service
valve. Connect liqnid tubing to filter &ier. (See Table 1 and Fig.
9.) Connect other end of filter drier to adapter tube on liquid line
smwice valve.
REQUIRED FOR
ACCESSORY SEACOAST APPLICATIONS
(WITHIN 2 MILES)
Coastal Filter Yes
Support Feet Recommended
Puron® Balance-Port Hard Shutoff TXV Yesl-
Puron® Liquid-Line Solenoid Valve for Heating No
Table 2--Accessory Usage
REQUIRED FOR LONG-LINE
APPLICATIONS*
(OVER 50 FT)
No
No
Yesl
KHALS0401LLS
* For tubing line sets between 50 and 175 ft horizontal or 20 ft vertical differential refer to Application Guideline and Service Manual--Air Conditioners and Heat Pumps
Using Puron® Refrigerant. Crankcase heater and start assist are standard on two-speed units.
1 Required for all applications.
SWEAT CONNECTION
V.,l[qAliiIg_
To prevent damage to unit or service valves, observe the
following:
• Use a brazing shield.
• Wrap service valves with wet cloth or use a heat sink
material.
Braze sweat connections using industry accepted methods and
materials. Do not use soft solder (materials which melt below
800°F). Consult local code requirements.
LEAK CHECKING
Leak test all joints in indoor, outdoor, and refrigerant robing.
EVACUATE REFRIGERANT TUBING AND INDOOR (;OIL
M [qAli_o]3
To avoid compressor damage, never use the system compres-
sor as a vacuum pump.
Refrigerant tubes and indoor coil nmst be evacuated to 500
microns.
IMPORTANT: Never open system under vacuum to atmosphere
without first breaking it open with nitrogen.
Deep Vacuum Method
The deep vacuum method requires a vacuum pump capable of
pulling a mininmm vacuum of 500 microns and a vacuum gage or
thermistor 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. 10.)
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 metah Pay close
attention to feeder tubes, making sure wire ties on feeder tubes are
secure and tight.
Step 8--Make Electrical Connections
To avoid 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 con'ection 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 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 cun'ent. Locate disconnect within sight
from and readily accessible from unit, per Section 440-14 of NEC.
ROUTE GROUND AND POWER WIRES
Remove access panel and control box cover to gain access to unit
wiring. Extend wires from disconnect through power wiring hole
provided and into unit control box. Size wires per NEC but not
smaller than nlininmm wire size shown in Product Data Digest.
The unit cabinet must have as uninten'upted 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. Failure to follow this warning can result in an
electric shock, fire, or death.
CONNECT GROUND AND POWER WIRES
Connect ground wire to ground connection in control box for
safety. Connect power wiring to leads provided as shown in Fig.
11.
CONNECT CONTROL WIRING
Route 24v control wires through control wiring grommet and
connect to leads provided in control box. (See Fig. 12.)
Use No. 18 AWG color-coded, insulated (35°C minimum) wire. If
thermostat is located more than 100 ft fi'om unit, as measured
along the control voltage wires, use No. 16 AWG color-coded wire
to avoid excessive voltage drop.
All wiring must be NEC Class 1 and nmst be separated from
incoming power leads.
The outdoor unit requires a minimum of 27-va, 24v control power.
FINAL WIRING CHECK
IMPORTANT: Check factory wiring and wire connections to
ensure temlinations are secured properly. Check wire routing to
ensure wires are not in contact with tubing, sheet metal, etc.
Step 9--Install Electrical Accessories
GENERAL
Refer to the individual instructions packaged with kits or acces-
sories when installing. The liquid line solenoid valve accessory is
available on these units. See Fig. 13 for wiring diagrmn.
Step 10--Make Airflow Selections
---->AIRFLOW SELECTION FOR 58CVA 58CVX FURNACES
The 58CVAi58CVX Non-Condensing Variable Speed Furnaces
provide high- and low-speed blower operation to match the
Table 3--Required Liquid-Line Temperature (°F)
LIQUID PRESSURE AT REQUIRED SUBCOOLING TEMPERATURE
SERVICE VALVE (°F )
(PSIG) 5 10 15 20
174 56 51 46 41
181 58 53 48 43
188 61 56 51 46
195 63 58 53 48
202 65 60 55 50
209 67 62 57 52
216 69 64 59 54
223 71 66 61 56
230 73 68 63 58
237 75 70 65 60
244 77 72 67 62
251 79 74 69 64
258 81 76 71 66
265 82 77 72 67
272 84 79 74 69
279 86 81 76 71
286 88 86 78 73
293 89 84 79 74
300 91 86 81 76
307 93 88 83 78
314 94 89 84 79
321 96 91 86 81
328 97 92 87 82
335 99 94 89 84
342 100 95 90 85
349 102 97 92 87
356 103 98 93 88
363 105 100 95 90
370 106 101 96 91
377 107 102 97 92
384 109 104 99 94
391 110 105 100 95
398 112 107 102 97
405 113 108 103 98
412 114 109 104 99
419 115 110 105 100
426 117 112 107 102
433 118 113 108 103
440 119 114 109 104
447 120 115 110 105
454 122 117 112 107
461 123 118 113 108
468 124 119 114 109
475 125 120 115 110
482 126 121 116 111
489 127 122 117 112
496 129 124 119 114
503 130 125 120 115
510 131 126 121 116
517 132 127 122 117
524 133 128 123 118
531 134 129 124 119
538 135 130 125 120
545 136 131 126 121
552 137 132 127 122
559 138 133 128 123
566 139 134 129 124
573 140 135 130 125
580 141 136 131 126
587 142 137 132 127
594 143 138 133 128
601 144 139 134 129
608 145 140 135 130
SWEAT/FLARE
ADAPTER
SEAL
PISTON
PISTON BOD'_
LIQUID SERVICE VALVE
A01214
Fig. 8--Liquid Service Valve with Sweat Adapter
Tube
LiQUID-LiNE
FILTER-DRIER
SERVICE
VALVE
A01215
Fig. 9--Filter Drier with Sweat Adapter Tube and
Liquid Tube
500O
4500
4000
3500
z 3000
O2500
O2000
1500
1000
500
LEAKIN
SYSTEM
VACUUM TIGHT
TOO WET
TIGHT
DRY SYSTEM
01234 567
MINUTES A95424
Fig. 10--Deep Vacuum Graph
capacities of the compressor at high and low speeds. To select the
recommended airflow and for adjustments to the manual switches
labeled SW1, AiC and CF on the control board refer to the furnace
Installation, Start-Up, and Operating Instructions. The
58CVAi58CVX utilizes a control center that allows the installing
technician to select the proper airflows. The AC switch deter-
mines the airflow during high speed compressor operation. Air-
flow for high and low speed can be calculated at either 350 CFM
per ton or 400 CFM per ton based on the positions of SW1-5.
Table 4_LED Control Function Light Code
CODE DEFINITION *
Constant flash No demand 10
No pause Stand by
1flash
w/pause Low-speed operation 9
2flashes
w/pause High-speed operation 8
3flashes Outdoor ambient thermistor failure 7
w/pause
4 flashes Outdoor coil thermistor failure 6
w/pause
3flashes
pause Thermistor out of range1- 5
4 flashes
5flashes
pause Low pressure switch trip 4
1flash
5flashes
w/pause High pressure switch trip 3
2 flashes
6 flashes
w/pause Compressor Vc/V . trip 2
Constant light
No pause Board failure 1
No flash
*Function light signal order of importance in case of multiple signal request; 1
is most important
1-Check both thermistors to determine which is faulty
AIRFLOW SELECTION FOR FK4, FV4, OR 40FK FAN COILS
The FK4, FV4, and 40FK provide high- and low-speed blower
operation to match the capacities of compressor at high and low
speeds. To select recommended airflow, refer to the FK4, FV4, or
40FK Installation Instructions. The FK4, FV4, and 40FK utilizes
an EASY SELECT control board that allows the installing
technician to select proper airflows. The ORANGE SYSTEM
TYPE JUMPER wire should be set to HP EFF or
HP COMFORT. The BLUE ACiHP SIZE JUMPER is used to
select airflow to match the outdoor unit nominal size in tons of
cooling. The BLACK ACiHP CFM ADJUST jumper is used to
make slight adjustments to the selected airflow tonnage. (See
Fancoil Installation Instructions for setting required airflow.) This
fan coil has an adjustable blower offdelay factory set at 90 sec. for
high- and low-speed blower operation.
For other combinations of equipment consult the Product Data
Digest.
Step 1l--Start-Up
To prevent compressor damage or personal injury, observe
the lbllowing:
• Do not overcharge system with refrigerant.
• Do not operate unit in a vacuum or at negative pressure.
• Do not disable low-pressure switch.
¥:I [qAli_0] "/1
DISCONNECT
PER N. E. C. AND/OR
LOCAL CODES
FIELD POWER
WIRING
FIELD GROUND
WIRING
CONTACTOR
_Fk__
O
-<29
GROUND
LUG
A91306
Fig. 11--Line Power Connections
Table 5--Defrost Dip Switch Settings
TIME DIP SWITCH #1 DIP SWITCH #2
30 up down
60 down up
90 down down
120 up up
AIRFLOW SELECTION FOR 58MVP FURNACES
The 58MVP Condensing Variable-Speed Furnaces provide high-
and low-speed blower operation to match the capacities of com-
pressor at high and low speeds. To select recommended airflow,
refer to the 58MVP Installation Instructions. The 58MVP utilizes
a control center that allows the installing technician to select
proper airflows. For adjustments to the manual switches labeled
AiC and CF and recommended switch positions, refer to Furnace
Installation Instructions lbr setting required airflow. High-speed
airflow is determined by the position of the AiC switches, and
low-speed airflow is determined by the position of the CF
switches.
To prevent personal injury wear safety glasses, protective
clothing, and gloves when handling refrigerant and observe
the following:
Back seating service valves are not equipped with Schrader
valves. Fully back seat (counter clockwise) valve system
before removing gage port cap.
repair or final unit disposah
Follow these steps to properly start up the system:
i. The outdoor unit is equipped with a crankcase heater which
operates when the compressor is OFF. Energize crankcase
heater 24 hr before starting unit. To energize heater only, set
indoor thermostat to OFF position and close power disconnect
to unit.
NOT!=: Starting the compressor without a mininmm of 12 hr of
crankcase heat prior to initial start-up, may result in compressor
chattering and possible damage to the compressor.
2. Fully back seat (open) liquid and vapor tube service valves.
3. Unit is shipped with valve stem(s) fi'ont seated and caps
installed. Replace stem caps after system is opened to refrig-
erant flow (back seated). Replace caps finger tight and tighten
additional 1/12 turn (20 ft-lb torque) with wrench.
4. Close electrical disconnects to energize system.
5. Set room thermostat at desired temperature. Be sure the set
point is below indoor ambient and is set low enough to
energize desired speed.
NOTI=: Carrier electronic thermostats are equipped with a 15-
minute staging timer. This timer prevents the dual capacity system
from operating at high capacity until unit has been operating in low
capacity for 15 minutes unless there is at least a 5°F difference
between room temperature and thermostat set point. To force high
capacity, adjust the set point at least 5°below room ambient for
Table 6--Factory Defaults
FAILED COMPONENT
Ambient Thermistor
Outdoor Coil Thermistor
FUNCTION
Defrost Initiation
One minute fan off delay in cooling
greater than or equal to 100°F
Defrost Initiation and Termination
DEFAULT
Defrost is initiated based on coil
temperature and time.
No delay function
Defrost occurs at each time interval, but
terminate after 5 minutes
cooling or 5° above room ambient for heating.
6. Set room thermostat to COOL or HEAT and fan control to
AUTO or ON as desired. Wait for appropriate time delay(s).
Operate unit for 15 minutes. Check refrigerant charge.
NOTE: Ifunithas not operated within the past 12 hr or following
a unit power-up, upon the next thermostat high- or low-speed
demand, unit operates for a minimum of 5 minutes in high-speed.
Step 12--Check Charge
Service valve gage ports are not equipped with Schrader
valves. To prevent personal injury, make sure gage manifold
is connected to the valve gage ports before moving valves off
fully back seated position. Wear safety glasses and gloves
when handling refi'igerant.
UNIT CHARGE
Factory charge is shown on unit rating plate. With unit operating,
charge Puron¢_ units with liquid using a commercial type metering
device manifold hose. Charge refrigerant into suction line. To
check charge in cooling mode, refer to Cooling Only Procedure.
To check charge in heating mode, refer to Heating Check Chart
Procedure.
Adjust charge in both heating and cooling by following procedure
shown on charging tables located on unit pink charging label on
back side of access panel.
NOTE: Unit is to be charged ill high capacity only. Charging in
low capacity may cause compressor chattering and possible
damage to the compressor.
COOLING ONLY PROCEDURE
i. Operate unit a minimum of 15 minutes before checking
charge.
2. Measure liquid service valve pressure by attaching and insu-
lating an accurate Puron,_,R3gage to smwice port.
3. Measure liquid line temperature by attaching an accurate
thermistor type or electronic thermometer to liquid line near
outdoor coil.
4. Refer to charging label for required subcooling temperatures.
5. Refer to Table 3. Find the point where required subcooling
temperature intersects measured liqnid smwice valve pressure.
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 CHARGE PROCEDURE
To check system operation during heating cycle, refer to the
Heating Pump Charging Instructions 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.
NOTE: In heating mode, check refrigerant charge only when
pressures are stable. If accessory vapor pressure switch is applied
and operating conditions cause vapor pressure switch and thereby
outdoor fan to cycle, check refrigerant charge in cooling or lower
indoor dry bulb temperature. If in doubt, remove charge and weigh
in correct refrigerant charge.
NOTE: When charging is necessary during heating season,
charge must be weighed in accordance with unit rating plate ±0.6
ozift of 3/8-in. liquid line above or below 15 ft respectively.
EXAMPLE:
To calculate additional charge required for a 25-ft line set:
25 ft - 15 ft i0 ft X 0.6 ozift 6 oz of additional charge
Step 13--System Functions and Sequence of Operation
The outdoor unit control system has special functions. The
following is an overview of the two-speed control functions:
COOLING OPERATION
This product utilizes a 2-stage cooling indoor thermostat. With a
call for first stage cooling (Y1), the outdoor fan and low capacity
compressor are energized. If low capacity cannot satisfy cooling
demand, high capacity is energized (Y1 and Y2 or just Y2) by the
second stage of indoor thermostat. After second stage is satisfied,
the unit returns to low-capacity operation until first stage is
satisfied or until second stage is required again. When both first
stage and second stage cooling are satisfied, the compressor will
shut off.
NOTE: Ifunit has not operated within the past 12hr, or following
a unit power-up, upon the next thermostat high- or low-speed
demand, unit operates for a mininmm of 5 minutes on high speed.
NOTE: Outdoor fan motor will continue to operate for one
minute after compressor shuts off, when outdoor ambient is greater
than 10O°F.
NOTE: When two-speed unit is operating in low-capacity cool-
ing, system vapor (suction) pressure will be higher than a standard
single-speed system or high-speed operation. This normal opera-
tion is due to the reduced capacity operating with typically larger
indoor and outdoor coils.
HEATING OPERATION
This product utilizes a 3-stage heating indoor thermostat. With a
call for first stage heating (Y1), the outdoor fan and low capacity
compressor are energized. If low capacity cannot satisfy heating
demand, high capacity is energized (Y1 and Y2) by the second
stage of the indoor thermostat. Auxiliary or back up heat is
controlled by third stage (Wl). After second stage of heat is
satisfied, the unit returus to low capacity operation until first stage
is satisfied or until second stage is required again. When both first
stage and second stage heating are satisfied, the compressor will
shut off.
NOTE: Ifunit has not operated within the past 12hr, or following
a unit power-up, upon the next thermostat high- or low-speed
demand, unit operates for a mininmm of 5 minutes on high speed.
PROGRAMMABLE
THERMOSTAT
MODEL 2S
24 VAC HOT [_-
FAN [_-
COOL/HEAT
STAGE 1
RVS COOLING E_
COOL/HEAT
STAG E 2
HEAT STAGE 3
N/A24VAC COMN_
OUTDOOR
SENSOR
CONNECTIO
NON-PROGRAMMABLE
THERMOSTAT
MODEL 2S
24 VAC HOT I RLRJq ,--
24 VAC COMM
FAN
COOL/HEAT
STAGE 2
HEAT STAGE 3
RVS COOUNG E_ ---'
COOL/HEAT E_" '---
STAGE 1
N/A []
OUTDOOR []
SENSOR --I
CONNECT'ON[. []
THERMIDISTAT
CONTROL
MODELRH
RVS COOLING
COOL/HEAT
STAGE 1
HEAT STAGE 3
COOL/HEAT
STAGE 2
FAN E_
24 MAC HOT E_
DEHUMID'FY E_
24 MAC COMM
HUMIDIFY
N/A E_
OOTDOOE"1--71""
SENSORTIoN_E _ .
40FK/FV4
FK4 TWO-SPEED
FAN COIL HEAT PUMP
1_ J1
-- -E>__,___z___%_._E:l
.... ]
.... D. --q_
.....£]-. --q_
....r_ --q_
N-
-- -El-. --q-El
See notes l, 2, and 3
4OFK/FV4
FK4 TWO-SPEED
FAN COIL HEAT PUMP
DE]-
-t23- J2 JUMPER
D ..........
-El-..........
-t_ ..........
See notes 1, 2, 3, and 4
40FK/FV4
FK4 TWO-SPEED
FAN COIL HEAT PUMP
.... _[5:1.__ _q-_
.... 7
J2 JUMPER
--7 D J-#qs
--- I_ __
L
-I -- "[]
I----- -E_ --
REMOVE31
/
.... O_____s._-__
.__2
............. .i
See notes i, 2, 3, 6, 9, and i0
A01427
A01425
A01421
THERMIDISTAT
CONTROL
MODEL RH
RVS COOLING
COOL/HEAT
STAGE 1
HEAT STAGE 3
COOL/HEAT
STAGE 2
FAN
24 VAC HOT E_
24 VAC COMM F_
N/A
HUMIDIFY
N/A
OUTDOOR _1'_'_
SENSORTIo N_[_ ] -
See notes i, 2, 3, 7, 8,
PROGRAMMABLE
DUALFUEL
THERMOSTAT
MODELDF
24 MAC HOT F_-
FAN F_-
HFEATESTAGE 3
COOL/HEAT
STAGE 2
RVS COOLING
COOL/HEAT
STAGE 1
CO_RESSORLC
24 MAC COM E_"
N/A 1_
RVS SENS,NG
OUTDOOR 1_
See notes l, 2, 3, 7,
THERMIDISTAT
CONTROL
MODELRH
RVS COOUNG
COOL/HEAT
STAGE 1
HEAT STAGE 3
COOL/HEAT
STAGE 2
FAN E_
24 VAC HOT E_
24 VAC COMM F_
N/A
HUMIDIFY
N/A E_
OUTDOOR
See notes i, 2, 3, 5, 7, 8,
SINGLE-STAGE TWO-SPEED
FURNACE HEAT PUMP
__ -_
..... 43......
..... _ ...... -_qZ]
..... 4:_::.--_<B
I
:-L_7
9, 10, and 11
A01422
SINGLE-STAGE TWO-SPEED
FURNACE HEAT PUMP
----E}- ......
-----"El
----El .......
----El .......
____[]_......
............. .i
8, and 12
A01423
TWO-STAGE
FURNACE
WITH PSC TWO-SPEED
BLOWER MOTOR HEAT PUMP
..... _ .....
...... _[]. ......
[]
......-D: ....
t
--_J
_-___-i
9, 10, and 11
A01426
Fig. 12--Typical 24V Circuit Connections
9
THERMID[STAT VARIABLE-SPEED
CONTROL CONDENSING TWO-SPEED
MODELRH FURNACE HEATPUMP
RVS COOLING
COOL/HEAT
STAGE 1
HEAT STAGE 3
COOL/HEAT
STAGE 2
FAN E_
24 VAC HOT E]_-'
DEHUMIDIFY
24VAC COMM [_
HUMIDIFY
N/A E_
OUTDOOR 'F_'
..... ._-:.....
[] -#--qB
...... ] ......
...... •.E}....... -,qqZi
r--"
I
I
-" EZ ...... -qqB
..... [_"6"1"'-. ___ _---
I
---_J
PROGRAMMABLE
DUALFUEL
THERMOSTAT
MODELDF
24 VAC HOT
FAN E_
HEAT STAGE 3
COOL/HEAT
STAGE 2
cc_lP_Esso__=
RVS COOLING
COOL/HEAT
STAGE 1
_cc_lP_Esso_LO
24 VAC COMM
N/A E_
RVS SENSING E_
OUTDOOR
SENSORT[oNS_E_
VARIABLE
SPEED
CONDENSING TWO-SPEED
FURNACE HEATPUMP
[]
............. .i
See notes i, 2, 3, 5, 7, 8, 9, i0, ii, and 13
VARIABLE SPEED 80%
NON-CONDENSING FURNACE
THERMID[STAT
CONTROL
MODELRH
RVS COOLING
HEAT/COOL
STAGE 1
HEAT STAGE 3
HEAT/COOL
STAGE 2
FAN F'_"
24 VAC HOT _"
24 VAC COM F_
DEHUMIDIFY
HUMIDIFY
N/A E_
OUTDOOR
............. .i
TWO-SPEED
HEAT PUMP
.a45u
-_qzA
See notes 1, 2, 3, 5, 7, 8, 9, i0, and l i
A03033
A03034
VARIABLE SPEED 80%
NON-CONDENSING FURNACE
See notes 1, 2, 3, 5, 7,
PROGRAMMABLE
DUAL FUEL
THERMOSTAT
24 VAC HOT
FAN
HEAT STAGE 3
(FURNACE) F_-
COOL/HEAT
STAGE 2 r_-
(COMPRESSOR HI)
RVS COOLING F'_'
COOL/HEAT
STAGE I F_'"
(COMPRESSOR CO)
24 VAC COM
N/A E_
RVS SENSING
OUTDOOR
8, and 12
A03036
TWO-STAGE TWO-SPEED
FURNACE HEAT PUMP
.... _ .... _
.... _ ..... -_
.... _ .... --'q-E]
.... -E] .....
............. .,i
SUGGESTED DIP
SWITCH SETTINGS
See notes ], 2, 3, 5, 7, 8, and ]2
A01424
PROGRAMMABLE
DUALFUEL
THERMOSTAT
MODELDF
RVS COOLING
COOL/HEAT
STAGE 1
CC_I"_ESSCRO
HEAT STAGE 3 _,
_Rr Ac_}
COOL/HEAT F_'
STAGE 2
_A_I_EssCRH=) _ __
24 VAC HOT E_ --
24 VAC COMM F'_"
N/A F'_
RVS SENSING
TWO-SPEED
HEAT PUMP
- r-[]-t ---
__,DL ....
---4::}......
....FT_......
DHUM
............. .I
-->
See notes 1, 2, 3, 5, 7_8_ and 12
Fig. 12--Typical 24V Circuit Connections (Cont'd)
10
A03035
LEGEND
24 VOLT FACTORY WIRING
24 VOLT FIELD WIRING
FIELD SPLICE CONNECTION
RELAY SPDT, PILOT DUTY
24-V COIL (HN61 KK324)
OR EQUIVALENT
R_
Hb./O HUMIDISTAT, OPENS ON
HUMiDiTY RiSE (HL38MG026)
AFS AIRFLOW SELECTOR
Q RELAY COIL
A03038
WIRING DIAGRAM NOTES:
i. Wiring must conform to NEC or local codes.
2. Underlined letter on thermostat terminal indicates its usage. For example: OW2 means O is energized in cooling mode.
3. Refer to indoor unit Installation Instructions for any additional features and wiring information.
4. Non-Programmable Model 2S01 B, when used in heat pump installations (iumper R19 NOT cut), uses OW2 to control reversing valve.
5. Furnace must control its own second-stage operation via furnace control algorithms. Refer to furnace Installation Instructions for proper
setup.
6. To activate dehumidify function on FK4 or FV4 remove J1 jumper at tan coil control board.
7. Heat pump MUST have a high-pressure switch for dual fuel applications.
8. Outdoor air temperature sensor nmst be attached in all dual fuel applications.
9. Thermidistat Dip Switch No. 1 should be set in ON position for heat pump installations.
10. Thermidistat Dip Switch No. 2should be set in the ON position for dual capacity compressor operation.
11. Thermidistat Configuration Option No. 10 "Dual Fuel Selection" must be turned ON in all dual fuel applications.
12. Dual Fuel Dip Switch D (no. 4) must be set in the ON position for dual capacity compressor operation.
13. The DE jumper located next to the DHUM terminal must be removed to enable the DEHUM input.
m
24 VAC HOT D
24 VAC COM D
FAN D
COOL/HEAT
STAGE2
HEATSTAGE3F_'
m
RVS COOLtNG
COOL/HEAT D
STAGE1
N/A []
OUTDOOR [--D
SENSOR "7
CONNECTIONL __D
m-
FK4/FV4 TWO-SPEED
FAN COIL HEAT PUMP
12FJ1 JUMPER _ - -
.{_ "-." ,'=-,
i I
E]-
-,q-D
IJ JUMPER-q--N
EY
El .....
"E]-
Fig. 13--Typical Solenoid Valve Wiring
YI
Y2 I
ILLS
I
I
I
_@ - J
_@ _ _1
A03039
11
Defrost Time
Selectors
Thermosta_
Low Voltage
Connector
03 1:_
->
_C
_fS_
NNNNNNNN_
°°'c=ff_' __c:5 _ o_:_ _ _ _i
..... HK38EA00_
Reserved for
Future Use
Fig. 14--Control Board
Low Pressure
_ Switch Connector
High Pressure
Switch Connector
*-Thermistor
Connection
To Run
Capacitor
] O.D.F. Connection
]Crankcase Heater
Connection
A01192
STATUS F[_'CTION LIGHTS
A system control STATUS function light is located on the outdoor
unit control board. (See Fig. 14.) The STATUS light provides
indication signals for several system operations. See Table 4 for
codes and definitions. Table 4 also provides the order of signal
importance.
NOTE: Only one code will be displayed on the outdoor unit
control board (the most recent, with the highest priority).
FACTORY DEFAULTS
Factory defaults have been provided in the event of fi_ilure of
outdoor air thermistor and, or outdoor coil thermistor. Refer to
Table 6 for default and ffmetion.
ONE MINUTE SPEED CHANGE TIME DELAY
When compressor changes speeds fi'om high to low or low to high,
there is a 1-minute time delay before compressor restarts. The
outdoor fan motor remains running.
COMPRESSOR OPERATION
When the compressor operates in second stage operation, the
motor rotates clockwise. Both the lower and upper pistons are
eccentric with the rotating crankshaft, and both compress refrig-
erant. When the compressor operates in single stage operation the
motor reverses direction (rotates counter-clockwise). The lower
piston becomes idle and the upper piston compresses refrigerant.
During single capacity operation the "start" and "run" wind-
ings are reversed.
CRANKCASE HEATER OPERATION
The two-speed control board energizes the crankcase heater during
unit's oft" cycle.
OUTDOOR FAN MOTOR OPERATION
The two-speed control energizes outdoor fan any time compressor
is operating. The outdoor fan remains energized during the
l-minute compressor speed change time delay and if a pressure
switch or compressor overload should open. Outdoor fan motor
Table 7--Two-Speed Compressor
(Winding Resistance at 70°F + 20°)
WINDING 024 036/037 048
Start (S-C) 2.280 1.850 1.459
Run (R-C) 0.770 0.745 0.552
060
0.740
0.356
12
will continue to operate for one minute after the compressor shuts
off when the outdoor ambient is greater than 100°F.
After termination ofa defi'ost cycle, the outdoor fan delays coming
on for 20 sec. This allows refrigerant system to recover outdoor
coil heat and minimize the "steam cloud" effect.
DEFROST TIME SELECTION
The defi'ost interval can be field selected, dependent on local or
geographical requirements. It is factory set at 90 minutes but can
be changed to either 30, 60, or 120 minutes. To select defi'ost time,
set dip switches located on the left side of the unit board (See Fig.
14). See Table 5 for Defi'ost Dip Switch Settings.
DEFROST
The dual capacity control logic for defrost function is time and
temperature initiated, time or temperature terminated.
Defrost only occurs at outdoor temperatures less than 50°F. The
control initiates del}ost when outdoor coil thermistor is 30°F (±2 °)
or less, and selected defrost time (intelwal) has been accumulated
during unit operation. Termination occurs when coil thermistor
reaches 80°F (±5 °) or defrost period reaches a maximum of 10
minutes. Defi'ost will occur at the compressor capacity that is being
called lbr. During defrost, unit operates in high or low capacity,
energizes reversing valve O and auxiliary heat W2, and de-
energizes outdoor fan. Upon termination, there is a 20-see delay in
outdoor fan being energized.
FIELD-INITIATED FORCED DEFROST
By placing a jumper across forced defrost temlinals (See Fig. 14)
for a mininmm of 5 sec and then removing it, a del}ost cycle can
be initiated. The cycle occurs only if outdoor ambient is less than
50°F, regardless of outdoor coil temperature. The cycle temlinates
when coil thermistor reaches 80°F (±5 °) or defrost period reaches
a maxinmm of 10 minutes.
COMPRESSOR VOLTAGE FAILURE (6 FLASHES)
The control senses the voltage of the compressor run winding. If
compressor voltage (Vc) is less than 90v when control board is
calling for compressor operation, control de-energizes compressor
contactor for 15 minutes with outdoor fan running. After 15
minutes (provided there is a call for Y1 or Y2), control attempts to
start compressor. During this time, a code of 6 flashes appears at
control board. If Vc trip occurs 3 consecutive times during a Y1
request, then low capacity operation is locked out and control
responds to Y2 requests until a reset occurs. If 3 consecutive trips
occur in a combination of Y1 and Y2 or all Y2 requests, then both
low and high capacity operation will be locked out. The compres-
sor voltage failure (6 flashes) can be caused by:
• compressor internal overload trip (refer to Table 7 for con'ect
winding resistance)
• no 208/230 volt power supply to outdoor unit
• failed compressor contactor(s)
• failure of start relay to pick-up properly
• improper wiring
PRESSURE SWITCH PROTECTION
The outdoor unit is equipped with high- and low-pressure
switches. If the control senses the opening of the high or low
pressure switch, it will respond as fbllows:
THERMISTOR CURVE
20 40 60 80 100 120
TEMPERATURE(DEG. F)
A91431
Fig. 15--Resistance Values Versus Temperature
i. De-energize the compressor hi or low speed contactor.
2. Keep the outdoor fan operating for 15 minutes.
3. Display the appropriate en'or code on the status light (see
Table 4).
4. After a 15 minute delay, if Y1 or Y2 inputs are on and the LPS
or HPS is reset, energize appropriate compressor contactor,
either low or high.
5. If LPS or HPS has not closed after 15 minute delay, outdoor
fan is turned of£ If the open switch closes anytime after the
15-minute delay, then resume operation on call for Y1 and.or
Y2.
MAJOR COMPONENTS
Two-Speed Control
The two-speed control board controls the following functions:
Low- and high-compressor contactor operation
Outdoor _an motor operation
Crankcase heater operation
Compressor protection
Pressure switch monitoring
Time delays
Time/temperature defrost
Control Box
Side of Unit
-- THERMISTOR PLACED
UNDERNEATHBASEPAN
(ATTACHED TO BASE PAN
WITH ADHESIVE)
A00430
Fig. 16--View from Top of Base Pan
Defi'ost interval selection
Electric heat operation during defrost mode
Field Connections
The two-speed control received 24vac low-voltage control system
inputs through the screw connections on the left side of the control
board.
Dual Capacity Compressor
The dual capacity compressor contains motor windings that
provide 3500 RPM operation. Refer to Table 7 for con'ect winding
resistance.
Compressor Internal Relief
The compressor is protected by an internal pressure relief (IPR)
which relieves discharge gas into compressor shell when differen-
tial between suction and discharge pressures exceeds 525 psi. The
compressor is also protected by an internal overload attached to
motor windings.
Compressor Control Contactors
Low and high capacity contactor coils are 24 volts. The electronic
control board controls the operation of the low speed (C-L) and the
high speed (C-H) contactors.
TEMPERATURE THERMISTORS
Thermistors are electronic devices which sense temperature. As
the temperature increases, the resistance decreases. Thermistors
are used to sense outdoor ambient and coil temperature. Refer to
Fig. 15 for resistance values versus temperature.
If the outdoor ambient thermistor or coil thermistor should fail, a
fault code appears at electronic control. The crankcase heater is
turned on during all off cycles.
IMPORTANT: OUTDOOR AIR THERMISTOR PLACEMENT
Mount outdoor air thermistor underneath unit base pan lip on
control box side of unit as shown in Fig. 16. Attach to base pan
with adhesive tape. A small piece of TXV bulb insulation tape may
be used.
IMPORTANT: If outdoor air thermistor is not properly placed
underneath base pan, unit may have nuisance thermistor out of
range faults.
Step 14--Final Checks
IMPORTANT: Before leaving job, be sure to do the following:
i. Ensure that all wiring and tubing is secure in unit before
adding panels and covers. Securely _asten all panels and
Covers.
2. Tighten service valve stem caps to 1i12-tum past finger tight.
3. Leave User's Manual with owner. Explain system operation
and periodic maintenance requirements outlined in manual.
4. Fill out Dealer Installation Checklist and place in customer
file.
CARE AND MAINTENANCE
For continuing high performance and to minimize possible equip-
ment failure, periodic maintenance must be performed on this
equipment. Frequency of maintenance may vary depending upon
geographic areas, such as coastal applications.
13
DUAL CAPACITY
CONNECTION DIAGRAM
Ill lllll
I
TO INDOOR UNIT
CCH
Fig. 17--Wiring Diagram--024, 036, 048
DL_L CAPACITY u .......
CONNECTION DIAGRAM
208/230-1- 60
pOWERSUPPLY
A03030
HPS
COMM STATUS
vc
1 VN
I _ ODF
I L2
CCH
[I _Ij
1
TO INDOORUNIT
Fig. 18--Wiring Diagram--037
A03032
14
DUAL CAPACITY L5
L/ .... /_
CONNECTION DIAGRAM
0 ........
Yt • ] VH
Wl • I_l A B C O ODF
c 7!=_L 2
R _ ' i CCH
I i
'i ,!
[,, _i]
r
TO ENDOORUNIT
Fig. 19--Wiring Diagram--060
A03031
]5
Copyright 2003 CARRIER Corp. • 7310 W. Morris St • Indianapolis, IN 46231 38ydb5si
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book_ 1_ 4 PC 101 Catalog No. 533-80088 Printed in USA Form 38YDB-5SI Pg 16 2-03 Replaces: 38YDB-4SI
Tab 15al 5a

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