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16

Problem

Cause

Solution

Unit not cooling. (Temperature

Failed Evaporator Blower.

Check Blower wire connections.

difference between return and

Check blower capacitor.

supply air is less than 10°F).

Replace Evaporator Blower.

Compressor and Condenser Blower
are running. Evaporator Blower does
not run.

Unit not cooling. (Temperature

Low Refrigerant charge.

Check discharge and suction pressure for

difference between return and

Refrigerant leak.

supply air is less than 10°F).

Failed Condenser Blower.

Check Blower wire connections.

Compressor and Evaporator Blower 

Check Blower Capacitor.

are running. Condenser Blower does

Replace Condenser Blower.

not run.

Failed Speed Controller.

Replace Pressure Switch or Relay.

Unit not cooling. (Temperature

Condenser or Evaporator

Clean Coil.

difference between return and

Coil clogged.

supply air is less than 10°F).

Evaporator Blower, Condenser

Loss of Refrigerant.

Locate and repair leak.

Blower and Compressor are running.

Ice on Evaporator Coil.

Clean Evaporator Coil.
Check discharge and suction pressure for 
Refrigerant leak.
Check for any obstruction of Evaporator airflow.
Check and seal all openings.

Excessive condensate 

Eliminate the frequency of door openings.

draining and loss of A/C 
sensible cooling performance.

Unit overcooling.

Failed Thermostat.

Check Thermostat wire connections

.

Evaporator Blower, Condenser

Replace Thermostat.

Blower and Compressor are running.

Failed Relay.

Replace Relay.

Compressor cycling more than

Short circuiting of air

Provide baffle in the enclosure separating A/C

10 cycles per hour.

between A/C discharge 

Outlet and inlet.

and inlet openings.

Excess vibration.

Defective motor in Blower.

Replace motor.

Defective wheel in Blower.

Replace wheel.

Bad Compressor.

Replace Compressor.

Summary of Contents for KAC4P3777R

Page 1: ...ONDITIONER IT IS IMPORTANT THAT INSTALLATION INSTRUCTIONS DOCUMENT NUMBER 900 090 00 SHIPPED WITH THE UNIT BE READ AND UNDERSTOOD THOROUGHLY KOOLTRONIC INC 30 Pennington Hopewell Road Pennington NJ 08...

Page 2: ...Introduction Kooltronic Air Conditioners are designed to provide a cool dehumidified environment for your electronic components There are models to fit virtually all sizes and shapes of electronics en...

Page 3: ...ate in a horizontal position only This placement must be done a minimum of 5 minutes prior to operating in order to allow the compressor oil to drain to the compressor sump area CAUTION 3 Before opera...

Page 4: ...LABORATORIES INC TYPES 3R 12 INTERFACE TO THE ELECTRICAL ENCLOSURE ONLY NEMA EEMAC UL50 BY UNDERWRITERS LABORATORIES INC TYPE 1 SPECIAL PURPOSE AIR CONDITIONER EQUIPMENT COMPARTMENT ONLY Air Conditio...

Page 5: ...hrough the evaporator coil is transferred by the compressed refrigerant to the condenser coil Ambient air is then passed through the condenser coil where it absorbs the heat and is then discharged to...

Page 6: ...he unit receptacle labeled Thermostat Power 5 Turn the electrical power on 6 Verify that the evaporator blower is running The remote control includes a compressor time delay After operating three 3 mi...

Page 7: ...two upper studs Run the unit power cord through the enclosure cutout 5 Secure the unit to the enclosure using the remaining 4 supplied 1 4 bolts and nuts the two saved 1 4 nuts and the supplied 7 was...

Page 8: ...4 3 LOCK WASHER 3 1 2 3 NOTE CUSTOMER TO INSTALL GASKET AS SHOWN START AND END GASKET MATERIAL HERE USE ONE CONTINUOUS PIECE OF GASKET AROUND PERIMETER OF UNIT BEND GASKET AROUND THE CORNERS DO NOT S...

Page 9: ...2 11 50 292 1 1 4 20 MOUNTING STUD TYP 2 PLACES POWER CORD 1 4 20 CAGE NUTS TYP 4 PLACES 7 50 190 5 13 00 330 2 8 24 209 3 9 41 239 0 Drawings and Dimensions KAC4P3777R Dimensions inches mm are for re...

Page 10: ...aporator Impeller Capacitor 0452 06 Condenser Coil 0666 66 Evaporator Coil 0667 64 Heater 0718 22 Filter 8001F Heating Thermostat 0750 132 Cooling Thermostat 0750 131 Standard Features Low Temperature...

Page 11: ...11 Wiring Schematic WD 1327 KAC4P3777R WD 1327...

Page 12: ...12 Wiring Schematic WDNCRMAN KAC4P3777R WDNCRMAN...

Page 13: ...EVAPORATOR BLOWER BK GN CAP HEATER COOLING T STAT THERMAL CUTOUT HEATER T STAT LIMITER SWITCH PRESSURE SWITCH CONDENSER IMPELLER RELAY NC NO CONDENSER IMPELLER R C S O L CAP COMPRESSOR WD 1328 Rev A K...

Page 14: ...y A Filter and condenser coil service If an optional filter is installed on externally mounted air conditioners filter should not be used for internal mounted air conditioner the rear panel must be re...

Page 15: ...running Low Line Voltage Check Nameplate Voltage against supply Voltage Compressor and Condenser Blower do not run Return temperature is Failed Compressor Check Compressor wire connections above set p...

Page 16: ...l difference between return and Coil clogged supply air is less than 10 F Evaporator Blower Condenser Loss of Refrigerant Locate and repair leak Blower and Compressor are running Ice on Evaporator Coi...

Page 17: ...was received by customer Number of parts to be returned Product description model and serial number Reason for return Action requested Contact name telephone FAX numbers and e mail address Pack unit i...

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