M0G940E8-00 04/07/08
pag
46
COMPRESSOR PROTECTION
1.
Identify the part on the wiring diagram
2.
Loose electric contacts/terminals, leads broken
3.
electrical windings interrupted
4.
Vacuum power voltage below the limits
5.
power contactors / contacts defective
6.
start-up power voltage lower than the limits
7.
electrical absorption high / unbalanced
8.
High compressor discharge temperature >
thermostatic device needs calibrating, insufficient
refrigerant charge
FAN PROTECTION
1.
Identify the part on the wiring diagram
2.
fan mechanically jammed, bearings / drive belt (if
present)
3.
Loose electric contacts/terminals, leads broken
4.
electrical windings of fan interrupted
5.
power supply voltage below limits
6.
electrical absorption high / unbalanced
PUMP PROTECTION
1.
Identify the part on the wiring diagram
2.
pump jammed (probable for circulator pump after
lengthy seasonal shutdowns)
3.
Loose electric contacts/terminals, leads broken
4.
electrical windings of fan interrupted
5.
power supply voltage below limits
6.
electrical absorption high / unbalanced
HIGH PRESSURE
(in heating)
1.
high air temperature (see operating limits)
2.
high water temperature (see operating limits)
3.
insufficient water flow to the exchanger (high
thermal difference between input and output)
4.
not CONSTANT flow (for example, if the pumps
are turned off, certain areas of the plant are
excluded or included, other uses are isolated, etc )
5.
Water filter clean / valves open /air bubbles in the
plant
6.
dirty exchanger
7.
Manostat/transducer: loose electric
contacts/terminals, wiring cables interrupted
8.
condensation gas in the cooling circuit
9.
Too much refrigerant
10.
Check the trigger point for the manostat and
transducer
11.
Check the manostat or transducer pressure
control point (deposits of oil, dirt, pin blocked
mechanically)
LOW PRESSURE (in heating)
1.
high water temperature (see operating limits)
2.
high air temperature (see operating limits)
3.
coil dirty / clogged
4.
fans don’t work / low speed
5.
Manostat/transducer: loose electric
contacts/terminals, wiring cables interrupted
6.
Check the trigger point for the manostat and
transducer
7.
refrigerant circuit pressurized? visible refrigerant
leakage? correct charge?
8.
Blocked dehydrator filter ?
9. thermostatic
device
not operating correctly?
10.
Check the manostat or transducer pressure
control point (deposits of oil, dirt, pin blocked
mechanically)
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