Haier HR18D2VAE User manual

No.0150505381 D
HR18D2VAE
HR24D2VAE
HR30D2VAE
13 SEER 1.5 to 5.0 Tons
HR36D2VAE
HR42D1VAE
HR48D1VAE
HR60D1VAE

! WARNING
These instructions are intended as an aid to qualified, licensed service personnel for proper installation,
adjustment and operation of this unit. Read these instructions thoroughly before attempting installation
or operation. Failure to follow these instructions may result in improper installation, adjustment,
service or maintenance possibly resulting in fire, electrical shock, property damage, personal injury
or death.
This product is designed and manufactured to permit installation in accordance with National Codes. It
is the installer's responsibility to install the product in accordance with National Codes and/or
prevailing local codes and regulations. The manufacturer assumes no responsibility for equipment installed
in violation of any codes or regulations.
The United States Environmental Protection Agency (EPA) has issued various regulations regarding
the introduction and disposal of refrigerants in this unit. Failure to follow these regulations may harm
the environment and can lead to the imposition of substantial fines. Because these regulations may vary
dueto the passage of new laws we suggest that any work on this unit be done by a certified technician.
Should you have any questions please contact the local EPA office.
The manufacturer's warranty does not cover any damage or defect to the air conditioner caused by the
attachment or use of any components, accessoriesor devices (other than those authorized by the manufacturer)
into, onto, or in conjunction with the air conditioner. You should be aware that the use of unauthorized
components, accessories or devices may adversely affect the operation of the air conditioner and
may also endanger life and property. The manufacturer disclaims any responsibility for such loss or
injury resulting from the use of such unauthorized components, accessories or devices.
Attach the service panel to the outdoor unit securely. If the service panel is not attached securely, it
could result in a fire or an electric shock due to dust, water, etc.
Message to Owner
These instructions should be carefully read and kept near the product for future reference. While the instructions are
addressed primarily to the installer, useful maintenance information is included. Have your installer acquaint you with
the operating characteristics of the product and periodic maintenance requirements.

1
TABLE OF CONTENT
1.Introduction --------------------------------------------------------------------------------------- 1
2.Nomenclature for Model Number --------------------------------------------------------------1
3.Specification ------------------------------------------------------------------------------------- 2
4.Unit Inspection ----------------------------------------------------------------------------------- 5
5.Equipment Protection From Environment ----------------------------------------------------5
6.Installation -----------------------------------------------------------------------------------------5
6.1. General --------------------------------------------------------------------------------------- 5
6.2.Unit clearances ------------------------------------------------------------------------------ 6
6.3.Refrigerant piping --------------------------------------------------------------------------- 6
6.4.Electrical wiring ----------------------------------------------------------------------------- 11
7.System Startup ----------------------------------------------------------------------------------- 12
8.Operation ----------------------------------------------------------------------------------------- 13
9.Miscellaneous ------------------------------------------------------------------------------------ 13
9.1.Replacement parts -------------------------------------------------------------------------- 13
9.2.Troubleshooting guide --------------------------------------------------------------------- 13
9.3.Wiring diagram ----------------------------------------------------------------------------- 13
1.INTRODUCTION
This manual contains the installation and operating instructions for your new Heat Pump.
Improper installation can result in unsatisfactory operation or dangerous conditions. Carefully
read this manual and any instructions packaged with separate equipment required to make up
the system prior to installation. Give this manual to the owner and explain its provisions. The
owner should retain this manual for future reference.
H
R
24
D
2
V
A
E
Example:HR24D2VAE
Design series. 1-1st Generation,2-2nd Generation
Electric:V=208/230-1-60;C=208/230-3-60;D=460-3-60,Y=575-3-60
Body style
Refrigerant type R:R22;E:R410A
Brand symbol-H:Haier
System type-C:Air conditioner;R:Heat pump
Nominal capacity in (000) Btu/h
SEER designation. D=13,E=14
2.NOMENCLATURE FOR MODEL NUMBER

The dimensions for the condensing unit are illustrated in Figure 1. Physical and electrical
specifications are provided in Table 1 for 13 SEER systems respectively.
The Figure 2 show a schematic of a heat pump on the cooling cycle and the heating cycle.
3.SPECIFICATION
Table1: Model:HR18-36D2VAE HR42-60D1VAE
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Figure 1
3
DW
H
Table2: System Capacity
cooling
heating
Capacity SEER CFM 80 85 90 95 100 105 110 115
HR18D2VAEHB2400VD2M20M18000136702034019746190801800017730174601719016920
HR24D2VAEHB2400VD2M20H24000139002712026328254402400023640232802292022560
HR30D2VAE HB3600VD2M20-T L 30000 13 1125 33900 32910 31800 30000 29550 29100 28650 28200
HR36D2VAE HB3600VD2M20-T H 34000 13 1300 38420 37298 36040 34000 33490 32980 32470 31960
HR42D1VAEHB4800VD3M22L410001314804633044977434604100040385397703915538540
HR48D1VAEHB4800VD3M22H475001315605367552108503504750046788460754536344650
HR60D1VAE HB6000VD1M22-T H 57500 13 1730 64975 63078 60950 57500 56638 55775 54913 54050
ARI data of indoor Cooling Capacity with different outdoor temperature
Outdoor Indoor Indoor fan speed
Capacity HSPF CFM -10 0 10 20 30 40 50 60
HR18D2VAEHB2400VD2M20M168007.76705568748893761129513152154741823221000
HR24D2VAEHB2400VD2M20H220007.790070009413117871420016533194532292026400
HR30D2VAE HB3600VD2M20-T L 27800 7.7 1125 8845 11895 14894 17944 20892 24582 28963 33360
HR36D2VAE HB3600VD2M20-T H 32000 7.7 1300 10182 13692 17144 20655 24048 28296 33338 38400
HR42D1VAEHB4800VD3M22L410007.714801304517543219662646430812362544271549200
HR48D1VAEHB4800VD3M22H475007.715601511420324254483065935697420014948657000
HR60D1VAE HB6000VD1M22-T H 57000 7.7 1730 18136 24389 30538 36791 42836 50402 59384 68400
Outdoor Indoor Indoor fan speed ARI data of indoor Heating Capacity with different outdoor temperature

Figure 2 Heat Pump Refrigerant Circuit
4
SERVICE VALVE
SERVICE PORT
DISCHARGE TEMP. SENSOR
INDOOR COIL
DISTRIBUTOR
OUTDOOR COIL
COMPRESSOR
SERVICE PORT
ACCUMULATOR
HIGH PRESSURE
SWITCH
LOW PRESSURE
DEFROST SENSOR
DRIER
Cooling
SERVICE VALVE
SERVICE PORT
DISCHARGE TEMP. SENSOR
INDOOR COIL
DISTRIBUTOR
OUTDOOR COIL
COMPRESSOR
SERVICE PORT
ACCUMULATOR
HIGH PRESSURE SWITCH
LOW PRESSURE
DEFROST SENSOR
DRIER
Heating
REVERSING VALVE
R
ES
NEDNOC
R
O
T
A
ROPAV
E
REVERSING VALVE
R
ES
N
ED
N
O
C
RO
T
A
R
OPA
V
E
SERVICE VALVE
SERVICE PORT
SERVICE VALVE
SERVICE PORT
DISTRIBUTOR
DISTRIBUTOR
SWITCH
SWITCH
CHECK VALVE
CHECK VALVE

5
4.UNIT INSPECTION
This product has been inspected at the factory and released to the transportation agency without
known damage. Inspect exterior of carton for evidence of rough handling in shipment. Unpack
carefully. If damage is found, report immediately to the transportation agency.
5.EQUIPMENT PROTECTION FROM ENVIRONMENT
The metal parts of the unit may be subject to rust or corrosion in adverse environmental conditions.
This oxidation could shorten the unit life. Salt spray or mist in seacoast areas, sulphur or chlorine
from lawn watering systems and various chemical contaminants from industries such as paper mills
and petroleum refineries are especially corrosive.
If the unit is to be installed in an area where contaminants are likely to be a problem, special attention
should be given to the equipment location and exposure.
Avoid having lawn sprinkler heads spray directly on the unit cabinet.
In coastal areas, locate the unit on the side of the building away from the waterfront.
Shielding provided by fence or shrubs may give some protection.
Regular maintenance will reduce the buildup of contaminants and help to protect the unit's finish.
! WARNING - Disconnect all electrical power to the unit before servicing. Disconnect power to
both the indoor and outdoor units.
NOTE: There may be more than one electrical disconnect switch. Failure to shut off power can
cause electrical shock resulting in personal injury or death.
Frequent washing of the cabinet, fan blade and coil with fresh water.
Regular cleaning and waxing of the cabinet with good automobile polish.
A good liquid cleaner may be used several times a year to remove matter that will not wash
off with water.
The best protection is frequent cleaning, maintenance and minimal exposure to contaminants.
6.INSTALLATION
6.1.GENERAL
These units are designed for outdoor installations. They can be mounted on a slab or rooftop. It
is important to consult your local code authorities at the time the first installation is made.
Check following points before attempting any installation:
Structural strength of supporting members.
Clearances and provision for servicing.
Power supply and wiring.
Location for minimum noise, where operating sounds will not disturb owner or neighbors.
Location where there is no risk of combustible gas leakage.
Location where external water drainage cannot collect around the unit.
Location where roof runoff water does not pour directly on the unit. Provide gutter or other
shielding at roof level. Don't locate unit in an area where excessive snow drifting may occur
or accumulate.

Provide a level concrete slab. To prevent transmission of noise or vibration, slab should not be connected
to building structure. Some sort of sound-absorbing material should be placed between the condenser
and the slab. A good material to use is rubber and cork pad.
For rooftop application, make sure the building construction can support the weight and that proper
consideration is given to the weather-tight integrity of the roof. The condensing unit contains moving
parts and can vibrate. Therefore, sound is also a consideration in rooftop applications.
6
! WARNING - Install the unit securely in a place that can bear the weight of the unit. When installed
in an insufficiently strong place, the unit could fall causing injury.
6.2.UNIT CLEARANCES
The minimum clearances for the unit are illustrated in Figure 3. Condenser air enters from three sides.
Air discharges upward from the top of the unit. Refrigerant tube and electrical connections are made
from the service access area. The most common application will find the unit best located about 10"
from back wall with connection side facing the wall. This application minimizes exposed tubing and
wiring, minimizing the space for youngsters to run around the unit with subsequent damage to the
tubing or wiring.
In more confined application spaces, such as corners provide a minimum of 10" clearance on all air
inlet sides. For service access to the compressor and control box, allow 18" minimum clearance. Ensure
top is unobstructed. If units are to be located under an overhang, there should be a minimum of 36"
clearance and provision made to deflect the warm discharge air out from the overhang.
In order to have an unrestricted air flow, owners should be advised to avoid lawn mower discharge
toward the unit depositing debris on the fin coil surface reducing the unit efficiency.
6.3.REFRIGERANT PIPING
The refrigerant piping is very important as it affects the proper operation and efficiency of the air
conditioning system. Note the following guidelines:
10" Min.
Service Access
18" Min.
Figure 3
10" Min.
10"
10"
Service Access
18" Min.

OUTDOOR UNIT
LIQUID LINE
PITCH SUCTION LINE TOWARD OUTDOOR
UNIT 1/2" FOR EVERY10' OF LINE
INDOOR UNIT ABOVE OR
LEVEL TO OUTDOOR UNIT
INDOOR UNIT
OUTDOOR UNIT
ADDITIONAL SUCTION LINE
OIL TRAP FOR EACH 20 FOOT
RISE OF PIPE
INDOOR UNIT
LIQUID LINE
SUCTION LINE OIL
TRAP WHEN INDOOR
UNIT IS 4 FEET OR
MORE BELOW
OUTDOOR UNIT
INDOOR UNIT BELOW OUTDOOR UNIT
70'
MAX.
Figure 4
7
Only refrigeration-grade copper piping (dehydrated and sealed) should be used. Take extreme care to keep
the refrigerant tubing clean and dry prior to and during installation. If in doubt, blow out the tubing
with dry nitrogen to remove any chips or debris before connection. Always keep tubing sealed until it is
in place and the connections are to be made.
Refrigerant piping should be as short as possible, with a minimum of elbows or bends, to avoid capacity
loss and increased operating costs.
Refrigerant lines must be adequately supported. If metal strapping is used to secure the tubing, do not allow
the strapping to directly contact the tubing. Use a closed cell insulation to separate the strapping from the
tubing.
Do not kink or twist the tubing.
Refrigerant piping should not be installed in a cement slab, as this limits access to the refrigerant should a
leak be suspected.
To ensure good oil return to the compressor, it is important to pitch the horizontal suction line toward
the compressor, approximately 1/2" for every 10' of line.
Line Insulation
Suction line requires insulation in order to prevent condensation from forming on the piping and to
prevent heat gain caused by surrounding air. Generally 3/8" wall thickness of Armflex or equivalent
is satisfactory. In severe application (hot, high humidity areas) greater thickness may be required.Apply
the line insulation by sliding it on the sealed tuing before cutting and making connections.
Liquid line does not necessarily need insulation, however, if they are exposed to high ambient temperatures
(i.e. kitchen, boiler rooms, hot attics & rooftop surface), then, they should be insulated. Make sure to
use the proper size tubing for the liquid line to prevent liquid refrigerant flashing to a vapor within
the liquid line.
Do not allow the vapor line and liquid line to touch together. This would cause an undesirable heat
transfer resulting in capacity loss and increased power consumption.
INVERTED LOOP
LIQUID LINE
OUTDOOR UNIT
SUCTION LINE
INDOOR UNIT 50'
MAX.
6' B-1
B-2
A

8
Refrigerant Line Sizing
Check the following table (Table 3) for correct suction and liquid line sizes for any combination of
the unit size and the maximum refrigerant line length.
Table 3:Refrigerant Line Sizing
The factory charge is sufficient for 15 feet of standard liquid line. For longer or shorter liquid line
lengths, adjust the charge as follows:
1/4" Line +/- 0.3 oz. Per foot
5/16" Line +/- 0.4 oz. Per foot
3/8" Line +/- 0.6 oz. Per foot
1/2" Line +/- 1.2 oz. Per foot.
Vertical Separation between Indoor and Outdoor Units
Maximum allowable vertical separations between indoor and outdoor units are illustrated in Figure
4-B-1 and Figure 4-B-2. It's 70' when the indoor unit is below the outdoor unit (Figure 4-B-1), and 50'
when the indoor unit is above the outdoor unit (Figure 4-B-2).
To ensure good oil return to the compressor when the indoor unit is below the outdoor unit, suction
line oil trap should be used as illustrated in Figure 4-B-1.
Tubing Connections
! CAUTION - Use extreme caution in removing the caps from the suction and liquid line fittings, as
there is pressure present. A fitting is on the liquid line to remove pressure.
! CAUTION - Heat Pumps are charged with refrigerant. Heat Pump liquid and suction valves are
closed to contain the charge within the unit. Do not force the valve stem against the retaining ring. If
the valve stem is backed out past the retaining ring, system pressure could force the valve stem out
of the valve body and possibly cause personal injury.
! CAUTION - The piston is in the accessory bag. Don't forget to take it out and put into the indoor
liquid pipe orifice.
Instructions on the field tubing connections and valve opening procedure are as follow:
Suction Liquid Suction Liquid Suction Liquid
1.5 3/4 3/8 3/4 3/8 3/4 3/8 13
2.0 3/4 3/8 3/4 3/8 3/4 3/8 13
2.5 7/8 3/8 7/8 3/8 7/8 3/8 13
3.0 7/8 3/8 7/8 3/8 7/8 3/8 13
3.5 7/8 3/8 7/8 3/8 1 1/8 3/8 13
4.0 7/8 3/8 1 1/8 3/8 1 1/8 1/2 13
5.0 7/8 3/8 1 1/8 1/2 1 1/8 1/2 13
Unit Size
(Ton)
Refrigerant Line Length (Ft)
Up to 25 26-50 51-75 Seer

1.Tubing should be cut square. Make sure it is round and free of burrs at the connecting ends.
Clean the tubing to prevent contamination from entering the system.
2.Make sure that both refrigerant stop valves at the outdoor unit are closed.
3.Push the tubing into the fitting until it stops. This prevents flux from getting into the system.
4.Remove the cap and Schrader valve core from the service port to protect the valve seals.
5.Wrap a wet rag around the valve stub before brazing.
6.Braze the joints of interconnecting tubing. Flow dry nitrogen into the shutoff valve port
and through the tubing while brazing.
7.After brazing quench with a wet rag to cool the joint. Reinstall the Schrader core in the valve,
if removed for brazing.
8.Pressurize the lines to 150 psi maximum with dry nitrogen. Check for leaks at all joints with
liquid detergent. If a leak is found, repair it after removing the nitrogen. Repeat the process
and re-ckeck.
9.Do not purge the lines with refrigerant. Evacuate the lines and indoor coil.
Refrigerant Metering Devices
Replace the existing indoor unit fixed orifice with the orifice supplied with the outdoor unit.
See table 4 for the fixed orifice size for each unit.
Table 4
9
outdoor model indoor model orifice size
HR18D2VAEHB2400VD2M20055
HR24D2VAEHB2400VD2M20059
HR30D2VAE HB3600VD2M20-T TXV(36K)
HR36D2VAE HB3600VD2M20-T TXV(36K)
HR42D1VAEHB4800VD3M22078
HR48D1VAEHB4800VD3M22085
HR60D1VAE HB6000VD1M22-T TXV(60K)
Fixed orifice size

10
Evacuation
All new installations must be evacuated to a deep vacuum in order that all noncondensible gases
and moisture are removed prior to charging the system. Air in a system causes high condensing
pressure, which increases power consumption and reduces performance. The presence of moisture
in a system can render it inoperable in a very short time. Proper evacuation assures a dry, uncontaminated
system. Here is the recommended evacuation procedure:
1.Connect vacuum pump to both liquid and suction valve service ports.
2.Evacuate the interconnecting tubing and indoor coil to 500 microns or less for a minimum
of 30 minutes. Close the valve to the vacuum pump and wait 15 minutes. Vacuum should
not rise above 800 microns. If unable to obtain 500 microns, or vacuum rises above 800
microns over 15 minutes period, discontinue evacuation, pressurize and check for leaks.
Repair any leaks found and repeat the step 2.
3.Close valve to the vacuum pump and stop pump.
4.When sure of a tight, well evacuated system, charge with refrigerant.
Charging the System
(For systems with capillary tube or fixed orifice metering device)
Before checking the system charge, make sure that the outdoor unit and indoor coil must be an
approved match per the unit specification. The indoor conditions should be within 2 F of the desired
comfort conditions.
! WARNING - Do not vent refrigerant to the atmosphere! It is a violation of federal law to do
so. If the refrigerant needs to be removed from a system to correct the charge inside, always use a
recovery or recycling device.
! WARNING - To prevent personal injury, wear safety glasses and gloves when handling
refrigerant.
1. Check subcooling and superheat.Systems with TXV application should have a subcooling of
9±2°F and superheat of 9 to 11°F.
a.If subcooling and superheat are low,adjust TXV to 9 to 11°F superheat,then check subcooling.
NOTE:To adjust superheat,turn the valve stem clockwise to increase and counter clockwise to
decrease.
b.If subcooling is low and superheat is high,add charge to raise subcooling to 9±2°F then check
superheat.
c.If subcooling and superheat are high,adjust TXV valve to 9 to 11°F superheat,then check
subcooling.
d.If subcooling is high and superheat is low,adjust TXV valve to 9 to 11°F superheat and remove
charge to lower the subcooling to 9±2°F.
NOTE:Do not adjust the charge based on suction pressure unless there is a gross undercharge.
2. Disconnect manifold set,installation is complete.
Subcooling formula=Sat.Liquid Temp.-Liquid line Temp.
Sub-cooling charging for units with TXV

5
11

Copper Wire Size -AWG
(1% Voltage Drop)
Supply Circuit Supply Wire Length - Ft
Ampacity 50 100 150 200
15 14 10 8 6
20 12 8 6 4
25 10 8 6 4
30 10 6 4 4
35 8 6 4 3
40 8 6 4 2
45 6 4 3 2
50 6 4 3 1
12
The condensing unit rating plate and the tables of "Physical and Electrical Specifications / Outdoor
Units" (Table 1) provide pertinent data necessary for the selection of proper size electrical service
and over-current protection devices.
Table 6 provides data on the minimum copper wire size as a function of supply wire length and circuit
ampacity.
Table 6: Minimum Wire Size Based on N.E.C. for 60 C Type Copper Conductors Below 100
Ampacity.
The owner should be made familiar with the location of the over-current protection, the proper size
for this application and the proper procedure for disconnecting power service to the unit.
The condensing unit control wiring requires a 24 Volt minimum, 25 VA service from the indoor
transformer as shown on the wiring diagram.
7.SYSTEM STARTUP
1.Turn thermostat to "OFF", turn on power supply at disconnect switch.
2.Turn temperature setting as high as it will go.
3.Turn fan switch to "ON". Indoor blower should run. Be sure it is running in the right direction.
4.Turn fan switch to "AUTO". Turn system switch to "COOL" and turn temperature setting below
room temperature. Unit should run in cooling mode.
5.The compressor, indoor blower, and outdoor fan should now be running. Make sure cool air is
supplied by the unit.
6.Turn the fan switch to the "Auto" position. The blower should stop 90 seconds later.
7.Turn system switch to "Heat" and fan switch to "Auto" .
8.Slowly raise the heating temperature setting. The compressor, indoor blower and outdoor fan should
now be running.
9.If unit operates properly on the heating cycle, raise the heating temperature setting high enough.
10.For thermostats with emergency heat switch return to startup.

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8.OPERATION
Most single phase units are operated without start relay or start capacitor. Such systems should
be off for a minimum of 5 minutes before restarting to allow equalization of pressures. The
thermostat should not be moved to cycle unit without waiting 5 minutes. To do so may cause
the compressor to stop on an automatic open overload device or blow a fuse. Poor electrical
service can cause nuisance tripping in overloads or blow fuses.
The compressor has an internal overload protector. Under some conditions, it can take up to 2
hours for this overload to reset. Make sure overload has had time to reset before condemning
the compressor.
9.MISCELLANEOUS
9.1. Replacement Parts
Contact your local distributor for a complete parts list.
9.2. Troubleshooting Guide
Refer to the troubleshooting guide (Table 7) included in this manual.(P14)
9.3. Wiring Diagram
Refer to the appropriate wiring diagram included in this manual.(P15)
Table 7:Troubleshooting Guide
! WARNING - Disconnect all electrical power to the unit before servicing. Disconnect power to
both the indoor and outdoor units. NOTE: There may be more than one electrical disconnect switch.
Failure to shut off power can cause electrical shock resulting in personal injury or death.
11.If checking the unit on the heating cycle in the wintertime, when the outdoor coil is cold enough
to actuate the defrost control, observe at least one defrost cycle to make sure the unit defrosts properly.
12.Check the refrigerant charge (see Instructions under "Charging the System").
13.Replace service port caps. Service port cores are for system access only and will leak if not tightly
capped.
14.Check unit for tubing and sheet metal rattles.
15.Instruct the owner on operation and maintenance.
Leave this "Installation and Operating Manual" and the "Use and Care Manual" with owner.

14
Run or start capacitor defective Replace
Loose connection Check and tighten all connections.
Condenser fan runs, Compressor stuck, grounded or open Wait for 2 hours for overload to reset.
compressor doesn't motor winding, open internal overload Replace compressor if still open.
Low voltage condition At compressor terminals, voltage must be within 10% of rating
plate volts when unit is running.
Low voltage condition Add start kit components
Incorrect voltage At compressor terminals, voltage must be within 10% of rating
Compressor plate volts when unit is running.
short-cycling Defective overload protector Replace - check for correct voltage
Refrigerant undercharge Add refrigerant
Register sweat Low evaporator airflow Increase blower speed or reduce restriction - replace air filter
Restriction in liquid line, Replace defective components
High head - Low metering device or filter drier
vapor pressures Flowrator piston size too small Change to correct size piston
Incorrect capillary tubes Change coil assembly
Blocked outdoor coil Clear away leaves and other debris
High head - High Refrigerant overcharge Correct system charge
or normal vapor Condenser fan not running Repair or replace
pressures Air, non-condensibles or Recover refrigerant, evacuate &
moisture in system recharge, add filter drier
Low head - High Flowrator piston size too large Change to correct size piston
vapor pressures Defective compressor valves Replace compressor
Incorrect capillary tubes Replace coil assembly
Low vapor - cool Low evaporator airflow Increase blower speed or reduce restriction - replace air filter
compressor - iced Operating below 65 F outdoors Add low ambient kit
evaporator coil Moisture in the system Recover refrigerant, evacuate & recharge, add filter drier
High vapor Excessive load Recheck load calculation
pressure Defective compressor Replace
Fluctuating head Air or non-condensibles in system Recover refrigerant, evacuate & recharge.
and vapor pressures
Pulsing noise at Air or non-condensibles in system Recover refrigerant, evacuate & recharge
metering device
or liquid line
Power off or loose electrical connection Make sure main switch is ON. Check and tighten all connections.
Incorrect thermostat setting Set thermostat correctly
No cooling/heating Defective contactor Check for 24V at contactor coil.
Open circuit breaker of blown fuses Reset or replace
Defective transformer Check wiring - Replace it.
Interconnecting low voltage wiring damage Replace thermostat wiring
Dirty filters Clean & replace
Indoor air blockage Check supply registers and return grills for blockage.
Blocked outdoor coil Clear away leaves and other debris
Improperly sized unit Recalculate load
Insufficient Cooling Improper airflow Check - should be 400CFM/Ton
/Heating Incorrect refrigerant charge Charge correctly per instruction.
Air, non-condensibles or moisture in system Recover refrigerant, evacuate & recharge, add filter drier
Incorrect voltage At compressor terminals, voltage must be within
10% of rating plate volts when unit is running.
Water on floor or in
furnace Blocked condensate drain and "P" trap Remove blockage
Symptom Possible Cause Remedy
Defective four way valve Check the valve coil or replace it
Table 7 Trouble-shooting guide

HR18-36D2VAE HR42-60D1VAE
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