INTARCON MCV-N - Troubleshooting: Compressor Operation and Cooling Performance

38
Syptom
Cause
Solution
The unit runs but the
room temperature does
not goes down
a) Faulty room temperature probe
b) Too often defrost cycles
c) Too small unit for the room size
d) Insufficient air-flow
e) The condenser is dirty or obstructed
a) Check the pr
obe value and calibrate
through parameters, check probe connections,
or replace probe.
b) Check defrost parameters
c) Recalculate the necessary power
d) Check air flow (rate, reflow, outlets)
e) Clean it
The unit froze the
product, even in case of
positive temperature set
point
a)
Faulty room temperature probe
a)
Check wiring and parameter
Prd
(
Pb1
),
replace probe and/or adjust Ot parameter
The unit works but loses
too much temperature
before restarting
a)
Regulation differential (parameter
Hy
) too
high
a)
Decrease regulation differential (parameter
Hy) by 2 ºC.
The evaporator gets too
much frost and the drain
tray overflows
a)
Too low evaporation pressure
b) Blocked drain-pipe
c) Cold room leak-proof fault
d) The door is opened too often, or there is too
much humidity
a)
Check pressure and find out the reason
b) Check draining pipe heater (for LT models)
and replace or connect the heater to continous
supply, set higher slope. Verify the heater is
placed all long the draining-pipe for LT
models)
c) Check continuity of steam barrier and seal
the joints. Check door leak-proof
d) Increase defrosting frequence
Condenser Alarm
CSd
or
pressure alarm PAL
Too high condensation
pressure
(HP Pressure switch
activates)
a) Insufficient air flow or air reflo
w in
condenser
b) Faulty condenser fan
c) Too high room temperature
d) Too dirty and obstructed condenser
e) Excess of refrigerant load
f) Air inside refrigerant circuit
a) Check air flow (rate, reflow, outlets)
b) Repair or replace
c) Check target temperature
d) Clean condenser and air intakes
e) Check and replace refrigerant load
f) Evacuate and replace refrigerant
Pressure alarm
PAL
Too low evaporation
pressure (LP pressure
switch activates)
Ice block in evaporator
a) Insufficient airflow in evap
orator.
b) Faulty evaporator fan
c) Evaporator is always iced
d) Frozen drain pipe
e) Obstructed refrigerant filter (different inlet
and outlet temperatures)
f) lack of refrigerant (leakage)
g) Too low condensation pressure
h) Faulty solenoid valve
i) Faulty expansion valve
a) Clean air intakes
b) Repair or replace
c) Check defrost and defrost parameters.
Increase defrost frequency
d) Check drain heater and replace if necesary
(for low temperature units)
e) Change refrigerant filter
f) Repair leakage, replace refrigerant load
g) Too low ambient temperature, too high
airflow rate, check and adjust condensation
parameters (only for split units) or replace the
unit
h) Repair or replace
i) Check posible humidity inside the circuit