33
SKOPE TME/SKT ActiveCore
Replacement Procedures
Service Manual
Procedure 24: To diagnose a problem
1. Do NOT initially fit system gauges.
2. Is the refrigeration system simply overloaded? Interview fridge owner to determine if there has been
any high heat loads. Visually check entire cabinet body, and seals for any air leakage. Check
product temperatures are in fact warm.
3. Perform a quick probe reading’. The control probe reading is shown on the controller faceplate
during normal operation. Press and hold the Energy Save (up) and Set (mute) buttons to display
the evaporator probe reading.
• ‘P_1’ = Control probe
• ‘P_2’ = Evaporator coil probe. Should = -1~-5°C
4. Isolate the fridge from the power supply and remove the refrigeration unit (see page 34).
5. Refer to the quick touch guide below, and go to frost test on the next page if necessary.
Quick Touch Guide
Possible faults with compressor and fans all operating and condenser is clean.
Temperature Compressor Discharge
pipe
Suction pipe Condenser Evaporator
Frozen
Perform Frost
Test
n.a.
Perform Frost
Test
n.a.
OK / Defrost
problem
Cold
Perform Frost
Test
n.a. OK
Perform Frost
Test
OK
Cool
Perform Frost
Test
Compressor
fault?
OK
Perform Frost
Test
Perform Frost
Test
Warm
OK OK
Perform Frost
Test
Hot
OK with high
load
OK
Perform Frost
Test
OK with high
load
n.a.
Extremely Hot
Compressor
fault?
OK with high
load
n.a.
Bad
ventilation
n.a.
Procedure 25: Frost Test
1. Disconnect evaporator fan motor and remove the control probe from the evaporator box. Run the
refrigeration unit for 8 minutes. Check the test results guide below.
Frost Test Results Guide
Possible faults with evaporator fan off, control probe out and 8 minute run time.
Temperature Compressor Suction pipe Evaporator
Frozen
Overcharge* OK OK
Cold and sweaty
Overcharge* OK SOG / Blockage*
Cool
OK OK SOG / Blockage*
Warm
OK SOG / Blockage* SOG / Blockage*
* Fit line piercing valves. SOG = Short of Gas
2. If Quick Touch and Frost Test prove OK, then investigate external influences. If possible allow fridge
to continue to operate and recover temperature.
3. If it is then necessary to fit Line tap valves and fit gauges ensure no refrigerant ventilation to
atmosphere and that all refrigerant is reclaimed and correctly disposed.
4. At completion of Service Repair braze closed process tubes. Ensure process tubes are left at least
100 mm in length. Line tap valves must be removed.
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