Kolpak Walk-ins PCL149MOP User manual

Brand: Kolpak Walk-ins

Model: PCL149MOP

Type: User manual

This manual is also suitable for

PCL249LOP

Electrical Problems

Yes

Yes Yes

Replace with correct

circuit breaker

Replace with correct

fuse(s)

Yes

Fuse(s) blow or circuit

breaker trips

Does the unit use circuit

breakers or fuses?

Are the fuses dual element

time delay?

Is the circuit breaker

HACR rated?

Is it the

correct amp rating for

the application?

Is it the

correct amp rating for

the application?

Yes

Is the amp draw

excessive at start up?

Is the

fan motor or

compressor drawing

excessive current?

Fuse blowing due to short.

Check fan motor, if OK

then see comp diagnostics

Check for siezed fan motor

or bad run capacitor

See compressor

diagnostics

Fuse(s)

Circuit breakers

Fan motor

Compressor

Compressor Will Not Run

Is proper voltage

applied at load side of unit

disconnect switch?

Is compressor contactor

pulled in?

Are the fuses blown

or breaker tripped in

the disconnect?

Is there power at

line side of unit

disconnect switch?

Is compressor

overload tripped?

Check for voltage at

contactor coil.

Allow time for compressor

to cool o.

Check starting

components.

Is high or low pressure

control open?

Check wiring and

repair as necessary.

Check for tripped

breaker in main panel.

Ohm out the

compressor windings.

YES

Replace breaker or

Refer to electrician.

YES

Good

Bad

Check wiring and

repair as necessary.

Replace

compressor.

Bad

Replace the starting

components.

YES

Replace

contactor.

YES

Determine cause

and reset.

Install manifold gauge set onto

suction and high side service valves.

Note: The procedures described below require the skills of a competent, EPA certied refrigeration technician.

Also required are a manifold gauge set, digital thermometer with thermocouple type probe,

pressure-temperature chart and various hand tools (wrenches, service valve rachet, etc.)

Refrigeration

Record suction line temperature,

4" from compressor.

Record discharge line temperature,

4 to 6" from compressor.

Compare super heat

and sub cooling.

Record liquid line temperature

before lter drier.

Is super heat within factory

specs of 10 – 12° F for freezers or

6 – 8° F for coolers?

Is liquid sub cooling

within factory specs

of 10 – 15° F?

Check and verify

refrigerant charge.

Not a refrigeration

system problem.

Is the evaporator ice covered?

See refrigerant

charging

procedure.

Charge OK?

See TXV

diagnostics.

See

“Walk-in Cooler or Freezer is Too Cold”

YES

NOT

YES

Find and repair leak

and recharge system.

TXV is hunting and

will not hold setting.

Note: To check expansion valves for proper operation, immerse the sensing bulb in a

pan of warm water. DO NOT spray sensing bulb with refrigerant of any kind.

Thermostatic Expansion Valve (TXV) Diagnostics

Is the TXV sensing bulb

mounted securely to the suction

line before the “P” trap?

The TXV is correct

for the application?

Remount sensing

valve properly.

Replace TXV

and drier.

YES

Is the valve

stuck closed?

Is the valve

stuck open?

YES

Check system for

proper operation.

Walk-In Cooler or

Freezer Too Warm

Yes

Reset to proper cut out,

dierential, and check operation

Check Wiring

Check coil for

open windings

Replace coil

See compressor will

not run chart on page 3

Replace solenoid

valve body

Replace control

Check through

3 cycles

Complete

Are temperature

control settings proper

for the application?

Did it work properly?

Is there

proper line voltage

at the solenoid

valve coil?

Is the

relay on the

temperature control closed

at set point plus

dierential?

Is the

liquid line solenoid

valve coil

energized?

Is the solenoid

valve open?

Are the windings open?

Walk in cooler or

freezer too cold

Yes

Check temperature

control for proper cut out

and dierential settings

Is it set properly?

Reset to proper cut out

and dierential, check

through 3 cycles

See refrigeration

system page

Is the

temperature control

opening at cut out and closing

at cut out plus

dierential?

Did the relay

contacts open?

Is the

liquid line solenoid coil

still powered?

Is the solenoid valve open?

Did it work properly?

Replace temperature control

Complete

Check for proper wiring

Replace temperature control

Replace solenoid

valve body

Ice has formed on the

evaporator during the

freeze cycle causing

blocked air ow

Are all evaporator

fan motors working?

Put system into defrost by

manually advancing the timer.

Did the system go

into defrost?

YES

Check defrost terminator

and fan delay switch.

Is there continuity between

black and red wire?

Is proper voltage applied

to the fan motor(s)?

Check defrost terminator for

continuity between black

and blue wires.

Check defrost timer

motor and contacts;

are they good?

Check for power at

defrost heaters.

Ohm out defrost heaters.

Do they ohm check OK?

Replace defrost heaters.

Note: If all procedures on this page check good, see TXV diagnostics.

Walk-In Freezer Evaporator Iced Up

YES

Replace timer.

YES

Replace fan motor(s).

Replace defrost

terminator.

Check for burnt or loose

wiring and repair as required.

Yes

No No

Possibly low charge, verify

and recharge as necessary.

Yes

YesYes

Valve not bypassing

in low ambients,

replace headmaster

valve and drier

Valve stuck in bypass

Find and repair leak, replace drier,

evacuate and recharge.

Check system for

proper operation

Not a refrigeration

system problem

Evaporator

freezes up at night

or during low ambient

conditions.

Evaporator Freeze Up at Night

or During Low Ambient Conditions

Is the suction

pressure low?

Is the liquid line cold?

Is the liquid line hot?

Is charge OK?

Does the system lose cooling or

freeze up at night or in low

ambient temperatures?

Note: Head pressure controls work by reference to a preset dome pressure charge

on the valve. They do NOT work based on temperature.

Troubleshooting Head Pressure Control Valve (HPCV)

Is the suction

pressure low?

Is the liquid

line cold?

Is the liquid

line hot?

Valve not bypassing in

low ambient conditions.

Valve stuck

in bypass.

If the system is experiencing freeze ups at night or in low ambient conditions,

it may be caused by a head pressure control not bypassing properly.

Replace headmaster

valve and drier.

In high ambient conditions, low ambient conditions may be simulated by spraying condenser coils with a ne mist

of cold water. The headmaster can then be tested as if it were in a cold environment.

Note: Take care not to spray water directly on fan motor or on exposed electrical connections.

YES

Check system for

proper operation.

YES

Not a refrigeration

system problem.

Is the discharge

pressure low?

Is the discharge

pressure high?

YES

Verify refrigerant

charge is correct

Freezer Drain Pan Icing Up

Check drain for

blockage.

Is the drain line trapped

outside of the freezer?

Check for proper voltage

at drain line heater.

Check drain line heater

for proper resistance.

Warning: Exercise caution when using test instruments

around exposed metal surfaces.

Note: Use only CO

or Nitrogen to clear plugged drains. DO NOT use any

chemical type of drain cleaners such as Drano, Liquid Plumber, etc.

YES

Clear drain as necessary.

See note below.

YES

Repair as necessary.

Bad

Find and repair cause of

improper voltage reading.

Good

Bad

Replace drain

line heater.

Is the drain pan heater properly

positioned and secured to the

drain pan?

YES

Reposition and secure.

Walk-In Freezer Door

Sweating or Icing Up

Check door gasket and sweep

for rips, tears, misalignment

and proper installation.

Check door frame heater for

proper amp draw with

clamp-on ammeter.

GoodBad

Replace gasket or sweep

and repair as necessary.

Bad

Check for proper voltage

applied to heater.

Good Bad

Check door frame heater

for proper resistance.

Find and correct cause

of voltage problem.

Replace door

frame heater.

Bad

Good

Check for door

closing properly.

Good

Bad

Check door for proper

mounting and bad hinges.

Warning: Exercise caution when using test instruments

around exposed metal surfaces.

Kolpak Walk-ins PCL149MOP User manual

Brand: Kolpak Walk-ins

Model: PCL149MOP

Type: User manual

This manual is also suitable for

PCL249LOP

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Kolpak Walk-ins PCL149MOP User manual

This manual is also suitable for

Kolpak Walk-ins PCL149MOP User manual

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