Bryant 619ENF, 619ENQ, 619ENF018, 619ENF024, 619ENF030 Installation, Start-up And Service Instructions Manual

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Page 1

installation, start-up and

619ENF

service instructions

FAN COIL UNITS

CONTENTS

Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . . . . . . . 1

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-13

I. Step 1 — Complete Pre-Installation Checks . . . . . . 1

II. Step 2 — Mount Unit . . . . . . . . . . . . . . . . . . . . . . . . . 5

III. Step 3 — Complete Refrigerant Piping

Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

IV. Step 4 — Make Electrical Connections . . . . . . . . . . 8

START-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

TROUBLESHOOTING. . . . . . . . . . . . . . . . . . . . . . . . . . . .14,15

SAFETY CONSIDERATIONS

Installing and servicing air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install or service air-conditioning equipment.

Untrained personnel can perform basic maintenance, such as cleaning and replacing filters. All other operations should be performed by trained service personnel. When working on air conditioning equipment, observe safety precautions in literature, tags, and labels attached to unit.

Follow all safety codes. Wear safety glasses and work gloves. Use quenching cloth for brazing operations. Have fire extinguisher available. Read these instructions thoroughly. Consult local building codes and the National Electrical Code (NEC) for special installation requirements.

619ENQ

Sizes 018-036

Cancels: New II 619E-18-4

4/1/06

GENERAL

CAUTION: This system uses R-410A, which has

higher pressures than R-22 and other refrigerants. No other refrigerant may be used in this system. All equipment must be designed to handle R-410A refrigerant. If unsure about equipment, consult the equipment manufacturer.

These instructions cover the installation, start-up and service of cooling only and heat pump duct-free systems.

INSTALLATION

I. STEP 1 — COMPLETE PRE-INSTALLATION CHECKS

A. Unpack Units (See Fig. 1)

Move the unit to final location. Remove unit from carton, being careful not to damage service valves and grilles. See Table 1A for installation materials included in shipment and see Table 1B for field supplied materials needed to complete the installation.

B. Inspect Shipment

File a claim with the shipping company if shipment is damaged or incomplete. Check the unit nameplate to ensure unit matches the job requirements.

C. Consider System Requirements

Consult local building codes and NEC for special installation requirements. Use only designated indoor units with outdoor units. See Tables 2 and 3.

WAR NING : Before installing or servicing system,

always turn off main power to system. There may be more than one disconnect switch. Turn off accessory heater power if applicable. Electrical shock can cause serious personal injury.

Fig. 1 — 619ENF,ENQ Units

Page 2

Table 1A — Installation Materials — Included In Shipment

DESCRIPTION QTY USAGE

Wall Hanging Bracket 1 For indoor unit installation.

Screws, 4xL10 2 For affixing unit and hanging bracket.

Screws, 5xL25 5/14*

Wireless Remote Control Mounting Bracket

*619ENF01824, 619ENQ018,024: 5

619ENF,ENQ030,036: 14

Table 1B — Installation Materials — Field-Supplied

NAME SPECIFICATIONS

Connection Pipe (nominal capacity)

Wall Sleeve — Wall Cap — Finishing Tape PVC Film Fastening Tape — Pipe Insulation — Drain Hose Sealer Putty — Power Supply Cable AWG 14 or higher Electrical Connecting Cable Between

Indoor and Outdoor Unit

LEGEND

AWG — American Wire Gage NEC — National Electrical Code

Liquid line: Mixed Phase line:

/8 in. (619ENF01824 and 619ENQ018,024) 3/4 in. (619ENF,ENQ030,036)

Cable Type: AWG 14 synthetic rubber insulation with Neoprene coating, according to NEC codes.

/8 in. (619ENF,ENQ018-036)

/8 in. (619ENF01824 and 619ENQ018,024), 3/4 in. (619ENF,ENQ030,036)

For wall hanging bracket installation. For wireless remote control mounting bracket installation.

1 For wireless remote control installation.

Table 2 — Matching Indoor Units to Outdoor Units See Fig. 2 for unit dimensions. Allow sufficient space for air-

OUTDOOR UNIT

538ENF018 Cooling Only 619ENF01824 538ENF024 Cooling Only 619ENF01824 538ENF030 Cooling Only 619ENF030

538ENF036 Cooling Only 619ENF036 538QNF018 Heat Pump 619ENQ018 538QNF024 Heat Pump 619ENQ024 538QNF030 Heat Pump 619ENQ030 538QNF036 Heat Pump 619ENQ036

COOLING ONLY OR

HEAT PUMP

INDOOR UNIT

flow clearance, wiring, refrigerant piping, and servicing units. See Fig. 3.

Avoid mounting the unit in areas that are:

• exposed to direct sunlight

• too close to heat sources

• too close to humid conditions

• located in an area with oily ambient conditions.

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Table 3 — Indoor Unit Physical Data

SYSTEM SIZE 018 024 030 036 NOMINAL CAPACITY (Btuh) 18,000 24,000 30,000 36,000 OPERATING WEIGHT (lb) 31 31 51 51 MOISTURE REMOVAL RATE

(Pints/hr) (619ENF/ENQ) REFRIGERANT

Type R-410A Control Device (Cooling) Accurator Piston at Outdoor Unit Control Device (Heating) Accurator Piston at Outdoor Unit System Charge Required (lb)* 6.0 6.3 7.4 10.5

INDOOR FAN

Rpm/Cfm (High) 1335/645 1335/645 1030/730 1200/900

Rpm/Cfm (Med) 1120/525 1120/525 930/630 1050/750 Rpm/Cfm (Low) 1000/460 1000/460 830/530 900/600 Motor Watts 64 64 74 74

Blowers Quantity...Size 1...4.0 x 33.7 1...4.0 x 33.7 2...4.2 x 23.5 2...4.2 x 23.5 INDOOR COIL

Face Area (sq ft) 3.0 3.0 4.9 4.9

No. Rows 2222

FPI (619ENF/ENQ) 16/16 16/20 18/18 18/18 Circuits 5599

FILTERS

Quantity...Size (in.) 2...12.5 x 16.1 2...12.5 x 16.1 3...17.3 x 16.1 3...17.3 x 16.1 AIR SWEEP

Horizontal Manual Manual Automatic Automatic Vertical Automatic Automatic Automatic Automatic

OPERATING LIMITS

Heating (Min/Max) —/81 F db

Cooling (Min/Max) 59 F wb, 70 F db/74 F wb, 90 F db CONTROLS Integrated Microprocessor

Remote Controller Options Wireless, CRC

Diagnostics Ye s

Defrost Method Demand Defrost

Timer Mode Ye s

Warm Start Feature Ye s

Test Mode Ye s Freeze Protection Ye s Dehumidification Mode Ye s Fan Mode Yes Auto Changeover Ye s Auto Restart Ye s Control Voltage 24v System Voltage 208/230

REFRIGERANT LINES

Connection Type Flare

Mixed Phase Line (in.) OD

Vapor Line (in.) OD

Max Length (ft) 200

Max Lift (Fan coil above) (ft) 60

Max Drop (Fan coil below) (ft) 60 CONDENSATE DRAIN

Size (in.)

LEGEND

CRC — Carrier Room Controller db — dry bulb FPI — Fins Per Inch wb — wet bulb

*Factory charge is based on 25 ft of interconnecting line.

5.4/5.2 7.9/7.9 8.8/9.2 13.0/12.8

/8 OD, 7/16 ID

/8 OD, 7/16 ID3/4 OD, 5/9 ID3/4 OD, 5/9 ID

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619ENF,ENQ

Fig. 2 — Unit Dimensions

619ENF01824

619ENQ018,024

DIMENSIONS

(in.)

619ENF,ENQ

030, 036

DIMENSIONS

(in.) A 42.5 57.5 B 11.6 13.4 C 7.9 9.5

4 in.

min.

4 in.

min.

80 in.

min.

8 in.

min.

619ENF,ENQ UNITS

Fig. 3 — Unit Clearances

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II. STEP 2 — MOUNT UNIT

Before mounting the 619ENF,ENQ unit on the wall with a wall hanging bracket, consider how the unit will be connected to the refrigerant piping. The indoor unit can be connected in four ways. Refer to Fig. 4 for connection options. When the piping is connected to points 1, 2 or 4, remove the knockout either at the side or at the bottom of the unit.

The indoor units are mounted on the wall with a wall hanging bracket. Position the wall hanging bracket so that it is flush with the wall. See Fig. 5 for service clearances. See Fig. 6 for wall bracket dimensions.

Complete the following when installing the wall hanging bracket:

1. Before installing the wall hanging bracket to the wall remove it from the indoor unit by pushing at the indicated pressure points at the bottom of the unit.

2. Install the wall hanging bracket in a location that is strong enough to withstand the weight of the unit.

3. Install the wall hanging bracket so that it is level. Use a plumb line if necessary.

NOTE: Be sure that the wall hanging bracket is level. If the wall hanging bracket is not level water will leak from the indoor unit.

4. Fasten the wall hanging bracket to the wall with 4 or more screw anchors through the holes near the outer edge of the bracket.

5. Install the wall hanging bracket flush to the wall, and ensure the bracket does not move.

6. If the unit is removed from the wall hanging bracket after installing it on to the wall, remove it by pushing up on the indicated marks at the bottom of the unit body.

III. STEP 3 — COMPLETE REFRIGERANT PIPING CONNECTIONS

When running the piping for indoor units the piping can be connected as rear piping or side or bottom piping. Refer to Fig. 4.

A. Rear Piping

Route the piping behind the indoor unit so that the piping is concealed by the unit. For rear piping installation drill a

/2 in. diameter hole in the wall at point A or B in Fig. 6. Drill

2 the hole at a slope so that the outside end is lower (

/2 in.) than the inside end to ensure optimal drainage. Refer

/4 in. to

to Fig. 7. Pass the pipe through the hole.

Fig. 4 — Indoor Unit Piping Configurations

5 in. min.

12 in.

min.

Plumb line

Remove Screw

Fig. 5 — Installing the Wall Bracket

2.1"

35.4"

2.8"

619ENF01824, 619ENQ018,024

619ENF, ENQ030,036

14.9"

2.8"

13.8

18 in.

min.

3.5"

7.7"

2.1"

5.1

5.1"

Fig. 6 — Wall Bracket Dimensions

B. Side or Bottom Piping

Remove the knockout in the unit and pass the piping through the wall. The pipe should slope downward and away from the unit to ensure optimal drainage.

C. Routing the Drain Hose and Refrigerant Piping

The drain hose and drain cap are assembled as shown in Fig. 8 in the factory. To do right-side (1), right-bottom (2) or right-back (3) piping in Fig. 4 draw the drain hose to rightside piping direction. (It is not always necessary to exchange the location of drain hose and drain cap.)

1. Tie together the refrigerant piping, the drain hose, and the electrical connection wire.

2. Route the refrigerant piping in the required direction, and bend carefully avoiding pipe deformation.

3. Bind the drain hose and the electrical connection wire together with fastening tape.

4. The drain hose should be at the bottom. See Fig. 9 and 10.

5. For left-hand piping, fit the pipes and the wiring into the recess at the back of the unit.

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Drill at Slope

Outdoor side

1/4 to 1/2 in. lower

Indoor side

Fig. 7 — Placement of Connection Piping

Drain Hose

Fig. 8 — Location of Drain Hose and Cap

Drain Cap

Fig. 10 — Location of Piping, Hose and Wiring

3. Fix the bottom part of the unit to the wall hanging bracket by pushing it carefully until the two bracket hooks fit into the marked places at the base of the unit until it snaps into place. Refer to Fig. 11.

NOTE:

• Do not crush or kink the indoor piping. Avoid sharp bends with a bend radius of less than 4 inches.

• Do not over bend the same part of the pipe frequently.

• Do not remove the flare nut from the indoor unit pipe until the piping is connected.

E. Outdoor Units

Outdoor units may be connected to indoor units using fieldsupplied tubing of refrigerant grade and condition. See Table 3 for correct line sizes. Do not use less than 10 ft of interconnecting tubing.

Fig. 9 — Location of Piping

D. Installing the Indoor Unit Body to the Wall Hanging Bracket

1. Pass the pipes through the wall sleeve and then hook the indoor unit body on top of the wall hanging bracket.

2. For left-hand piping, hang the unit on top of the wall hanging bracket and incline the unit using a tool such as a screwdriver set between the middle area of the body and bottom right of the wall hanging bracket. Connecting the pipe can be done more easily if the unit is inclined.

CAUTION: DO NOT BURY MORE THAN 36 IN.

OF REFRIGERANT PIPE IN THE GROUND. If any section of pipe is buried, there must be a 6-in. vertical rise to the valve connections on the outdoor unit. If more than the recommended length is buried, refrigerant may migrate to cooler, buried section during extended periods of system shutdown. This causes refrigerant slugging and could possibly damage the compressor at start-up.

If either refrigerant tubing or indoor coil is exposed to the atmosphere, the system must be evacuated following good refrigeration practices.

Run refrigerant tubes as directly as possible, avoiding unnecessary turns and bends. Suspend refrigerant tubes so they do not damage insulation on vapor tube and do not transmit vibration to structure. Also, when passing refrigerant tubes through a wall, seal the opening so that vibration is not transmitted to structure. Leave some slack in refrigerant tubes between structure and outdoor unit to absorb vibration.

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Wall Hanging Bracket

Hook

Hole

UNIT SIZE

619ENF01824 13.4 10.6

619ENF030 12.2 12.2

619ENF036 12.2 12.2

619ENQ018 13.4 10.6

619ENQ024 13.4 10.6

619ENQ030 12.2 12.2

619ENQ036 12.2 12.2

DIMENSION

Open the mixed phase valve for 3 seconds, then quickly shut it to check for possible leaks.

Replace caps and check for leaks using a leak detector specific for R-410A refrigerant.

After the leak test, fully open the three-way valves.

Table 4 — Tightening Torque

VALVE SIZE FLARE NUT (in.-lb)

/8 in. 372

/8 in. 487

/4 in. 885

Retainer Clip

Fig. 11 — Wall Hanging Details

F. Make Piping Sweat Connections

Remove plastic caps from liquid and suction service valves. Use refrigerant grade tubing.

Position tube end downward and cut the tube to the requested length. Remove the burrs with a reamer. See Fig. 12.

NOTE: Oil in the compressor is extremely susceptible to moisture absorption. Keep ends of tubing sealed during installation.

Remove flare nuts from the unit connections and place them on the tube end. Flare the tube with the flaring tool. The flare end must not have any burrs or imperfections. The length of the flared walls must be uniform. See Fig. 13.

Lubricate the tube end and thread of the flare fitting with antifreeze oil. Tighten the fitting several turns, then tighten it fully with two wrenches by applying the tightening torque indicated in Table 4 and Fig. 14.

Fig. 12 — Removing Burrs

CAUTION: Insufficient tightening torque will

cause gas leaks. Overtightening the fittings will damage the tube flaring and cause gas leaks. Equipment damage and personal injury may result.

G. Air Purging And Leak Test

Only use a vacuum pump to purge air from the piping. Refer to Fig. 15.

IMPORTANT: Do not use the system compressor as a vacuum pump.

IMPORTANT: Do not use the unit refrigerant gas to purge the connecting pipes.

Remove the caps from the valves. Create a vacuum with a vacuum pump connected to the service connection of the suction shut-off valves completely shut until a 50 Pa vacuum has been reached.

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Fig. 13 — Flared Walls are Equal

Adjustable wrench or torque wrench Outdoor end Indoor end

Fig. 14 — Tightening Connections

Page 8

Three-way valve (mixed-phase)

Needle valve

Valve cap

Valve needle

Allen (hex. head) wrench

Two-way valve (liquid)

Flare nut

Liquid line (small diameter)

Mixed-phase line (large diameter)

Indoor unit

Outdoor unit

Vacuum pump

Fig. 15 — Air Purging

IV. STEP 4 — MAKE ELECTRICAL CONNECTIONS A. Power Wiring (Fig. 16-19)

Unit is factory wired for voltage shown on nameplate. Pro-

WAR NING : Unit cabinet must have an uninter-

rupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC, and local electrical codes. Failure to follow this warning could result in the installer being liable for the personal injury of others.

vide adequate, fused disconnect switch within sight from unit, readily accessible, but out of reach of children. Provision for locking the switch open (off) is advisable to prevent power from being turned on while unit is being serviced. Disconnect switch, fuses, and field wiring must comply with the NEC and local code requirements. Use copper wire only between the disconnect switch and unit. Use minimum 60 C wire for the field power connection.

Open the fan coil control box panel and connect the indoor and outdoor units. Connect the wires through the terminals

CAUTION: Unit failure as a result of operation on

improper line voltage or excessive phase imbalance

as shown on the unit label diagram and in Fig. 16-19 and Table 5. Unit must be grounded.

constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Bryant warranty.

WAR NING : Before performing service or mainte-

nance, be sure main power switch is turned OFF and indoor blower and outdoor fan have stopped. Failure to do so may result in electrical shock or injury from rotating fan blades.

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Fig. 16 — 619ENF01824 Matched with 538ENF Typical Wiring Schematic

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Fig. 17 — 619ENQ018,024 Matched with 538QNF Typical Wiring Schematic

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Fig. 18 — 619ENF030,036 Matched with 538ENF Typical Wiring Schematic

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Fig. 19 — 619ENQ030,036 Matched with 538QNF Typical Wiring Schematic

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Table 5 — 619ENF,ENQ Fan Coil Electrical Data

UNIT SIZE V-PH-Hz

619ENF01824 208/230-1-60 187 253 0.38 64 0.48 15 14

619ENF030 208/230-1-60 187 253 0.38 74 0.48 15 14 619ENF036 208/230-1-60 187 253 0.44 74 0.55 15 14 619ENQ018 208/230-1-60 187 253 0.38 64 0.48 15 14 619ENQ024 208/230-1-60 187 253 0.38 64 0.48 15 14 619ENQ030 208/230-1-60 187 253 0.38 74 0.48 15 14 619ENQ036 208/230-1-60 187 253 0.44 74 0.55 15 14

LEGEND

FLA — Full Load Amps MCA — Minimum Circuit Amps per NEC Section 430-24 MOCP — Maximum Overcurrent Protection NEC — National Electrical Code RLA — Rated Load Amps (Compressor)

*Permissible limits of the voltage range at which unit will operate

satisfactorily.

START-UP

I. PRELIMINARY CHECKS

1. Check that all internal wiring connections are tight and that all barriers, covers, and panels are in place.

2. Field electrical power source must agree with unit nameplate rating.

3. All service valves must be open.

4. Crankcase heater must be tight on compressor crankcase (if equipped).

II. LEAK TEST

Field piping and fan coil must be leak tested by pressure method. Use R-410A at approximately 25 psig backed up with an inert gas to a total pressure not to exceed 245 psig.

NOTE: Leak detectors should be designed to detect HFC (hydrofluorocarbon) refrigerant.

III. EVACUATE AND DEHYDRATE

Field piping and fan coil must be evacuated and dehydrated following good refrigeration practices.

IV. START UNIT WITH OPERATING TEST

Turn power on to the unit. Insert batteries in remote control. Press the and the buttons on the remote control for 5 seconds. The remote control will be cleared and the time segment will display the Src1=service test mode.

Press the button to transmit the service test signal to the unit. After the test has completed press the button to leave the test menu.

NOTE: When 30 seconds have elapsed and no buttons have been pressed, the remote control will automatically exit the test menu and resume its normal operation.

VOLTAGE RANGE* FAN POWER

Min Max FLA

Motor Power

(Watts)

NOTES:

1. In compliance with NEC requirements for multimotor and combination load equipment (refer to NEC Articles 430 and 440), the overcurrent protective device for the unit shall be fuse or equipped with a breaker.

2. Motor RLA values are established in accordance with UL (Underwriters Laboratories) Standard 465.

MCA MOCP

V. CONFIGURING TWO INDOOR UNIT REMOTE CONTROLS

If two indoor units are being installed in the same room, working independently, two remote controls need to be configured for proper operation.

A. Unit Configuration

Turn the unit off by pressing the . Press and hold the

and buttons of the remote control for more than 5 seconds. The display will be cleared and the time segments will display the first configuration item (rAdr=remote address) and the temperature segments will display the default value of this configuration item (Ab=control of both indoor units). Press and to change the default value to the new value of (a) or (b). Press the button to transmit the new configuration to the unit. Press the button to leave the configuration menu.

B. Remote Control Configuration

Turn the unit off by pressing the button. Press and hold the and buttons for more than 5 seconds. The display will be cleared and the time segments will display the first configuration item (CH=remote address) and the temperature segments will display the default value of this configuration item (Ab=control of both indoor units). Press and to change the default value to the new value of (a) or (b). Press the button to transmit the new configuration to the unit. Press the button to leave the configuration menu.

NOTE: When 30 seconds have elapsed and no buttons have been pressed, the remote control will automatically exit the test menu and resume its normal operation.

MIN WIRE

SIZE

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Page 14

SERVICE

WAR NING : Before performing recommended

maintenance, be sure unit main power switch is turned off. Failure to do so may result in electrical shock or injury form rotating fan blade.

I. PUMPDOWN PROCEDURE

The system may be pumped down in order to make repairs on the low side without losing complete refrigerant charge.

1. Attach pressure gage to suction service valve gage port.

2. Frontseat the mixed phase line valve.

CAUTION: The unit coils hold only the factory-des-

ignated amount of refrigerant. Additional refrigerant may cause units to relieve pressure through the compressor internal pressure relief valve (indicated by a sudden rise of suction pressure) before suction pressure reaches 20 psig. If this occurs, shut off unit immediately then frontseat the suction valve and remove and recover excess refrigerant following accepted practices. Equipment damage may result.

NOTE: Do not install a suction-line filter drier in the mixed phase line.

III. REFRIGERANT CHARGING

WARNING: To prevent personal injury, wear

safety glasses and gloves when handling refrigerant. Do not overcharge system — this can cause compressor flooding.

NOTE: Do not vent or depressurize unit refrigerant to atmosphere. Remove and recover refrigerant following accepted practices.

TROUBLESHOOTING

See Tables 6 and 7 for troubleshooting information.

I. FAULT CODE

Once a failure occurs with the indoor unit in operation, the green LED on the indoor unit flashes at intervals of 0.5 seconds. The fault code is deduced from the number of times the green LED flashes, blocking unit operation. Between one flash cycle and the next one, a pause of 3 seconds elapses.

Table 6 — Green LED (Indoor Unit Fault)

3. Start unit and run until suction pressure reaches 5 psig.

4. Shut unit off and frontseat suction valve.

5. Depressurize low side of unit and recover refrigerant following accepted practices.

II. FILTER DRIER

Whenever the filter drier is exposed to the atmosphere it must be replaced. Only use factory specified liquid-line filter driers with rated working pressure of at least 600 psig or more.

CODE DESCRIPTION

3 Room Air Sensor Fault 4 Indoor Unit Coil Sensor Fault

14 Outdoor Unit Air Sensor Fault

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Table 7 — Troubleshooting

PROBLEM POSSIBLE CAUSE SOLUTION

Compressor and Fan of the Outdoor Unit Will Not Start

Compressor Will Not Start, But Outdoor Fan is Operating

Compressor Stops Due to Overtemperature

Compressor Runs Continuously Unit selected is too small for application

Frequent Ice-Build-Up on Outdoor Coil

Discharge Pressure Too High Outdoor coil dirty or obstructed Clean or remove obstructions.

Discharge Pressure Too Low Indoor temperature setting too high or too low Check temperature setting.

Suction Pressure Too High Indoor temperature setting too high or too low Check temperature setting.

Suction Pressure Too Low Indoor temperature setting too high or too low Check temperature setting.

Outdoor Fan Cycling Due to Over-Temperature Protection

Unit not energized Check the main power connection. Main switch is set to OFF Check and put it to ON position. Main switch fuses are blown Replace fuses. Compressor cycling protection is on Wait for 3 minutes. Main power voltage is too low Check and set to the correct voltage. Electrical connections are too loose or are wrong Check and tighten or correct connections. Electrical connections of compressor are loose

or wrong Compressor burnt out; seized or protection

device on Wrong refrigerant charge in unit (excessive or

low) or air or other noncondensable gasses in the circuit

Main voltage is too high or too low Check voltage setting and adjust if necessary. Condenser coil obstructed Remove obstruction. Outdoor fan off Check cause and resume operation or repair. Wrong indoor unit thermistors Replace thermistors. Refrigerant circuit clogged Check and remove obstructions. Reversing valve faulty on heat pump models Replace reversing valve. Expansion device clogged or covered with ice Drain refrigerant, evacuate and recharge.

requirements Indoor temperature setting too low or too high Check temperature setting. Outdoor unit fan faulty Replace outdoor fan. Air or other noncondensable gasses in the

circuit

Obstructions at air intake or dirty indoor unit filters

Outdoor fan is stopped Check cause and repair.

Condenser fan faulty Replace condenser fan. Indoor temperature setting too low or too high Check temperature setting. Air or other noncondensable gasses in the

circuit

Outdoor coil dirty or obstructed Clean or remove obstructions. Indoor unit air filter dirty Clean filter.

Reversing valve faulty or internal leak Replace reversing valve.

Evaporator coil covered with ice Air circulation on the evaporator not sufficient; check

Expansion device or suction line clogged Check and repair. Outdoor fan does not stop during defrost

periods Electrical connection loose Check connections. Fan motor burn out Replace. Fan bearing seized Check and repair. Expansion device clogged or covered with ice Drain refrigerant, evacuate and replace.

Check and tighten or repair compressor.

Check for the cause and replace compressor if necessary.

Drain refrigerant, evacuate and recharge.

CAUTION: Do not vent refrigerant to the atmosphere; use refrigerant recovery equipment.

Contact a qualified service technician for a system evaluation.

Drain refrigerant, evacuate and recharge.

CAUTION: Do not vent refrigerant to the atmosphere; use refrigerant recovery equipment.

Remove obstruction and/or clean filter.

Drain refrigerant, evacuate and recharge.

CAUTION: Do not vent refrigerant to the atmosphere; use refrigerant recovery equipment.

and repair.

Check electrical parts.

CAUTION: Do not vent refrigerant to the atmosphere; use refrigerant recovery equipment.

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