Daikin DRG0361DL00001S, Инструкция по эксплуатации

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55
SERVICING
S-17B Ground Test
If fuse, circuit breaker, ground fault protective device, etc.,
has tripped, this is a strong indication that an electrical
problem exists and must be found and corrected. The
circuit protective device rating must be checked, and its
maximum rating should coincide with that marked on the
equipment nameplate.
With the terminal protective cover in place, it is acceptable
to replace the fuse or reset the circuit breaker ONE TIME
ONLY to see if it was just a nuisance opening. If it opens
again, DO NOT continue to reset.
WARNING
Disconnect ALL power before servicing.
Disconnect all power to unit, making sure that all power
legs are open.
1. DO NOT remove protective terminal cover.
Disconnect the three leads going to the compressor
terminals at the nearest point to the compressor.
2. Identify the leads and using a Megger, Hi-Potential
Ground Tester, or other suitable instrument which
puts out a voltage between 300 and 1500 volts, check
for a ground separately between each of the three
leads and ground (such as an unpainted tube on
the compressor). Do not use a low voltage output
instrument such as a volt-ohmmeter.
HI-POT
Compressor Ground Test
3. If a ground is indicated, then carefully remove the
compressor terminal protective cover and inspect for
loose leads or insulation breaks in the lead wires.
4. If no visual problems indicated, carefully remove the
leads at the compressor terminals.
WARNING
Damage can occur to the glass embedded terminals if
the leads are not properly removed. This can result in
terminal and hot oil discharging.
Carefully retest for ground, directly between compressor
terminals and ground.
5. If ground is indicated, replace the compressor.
S-18 Testing crankcase heater (Optional Item)
NOTE: Not all compressors use crankcase heaters.
The crankcase heater must be energized a minimum of
twenty-four (24) hours before the compressor is operated.
Crankcase heaters are used to prevent migration or
accumulation of refrigerant in the compressor crankcase
during the off cycles and prevents liquid slugging or oil
pumping on start up. On some models, the crankcase
heater is controlled by a crankcase heater thermostat that
is wired in series with the crankcase heater.
A crankcase heater will not prevent compressor damage
due to a floodback or over charge condition.
WARNING
Disconnect ALL power before servicing.
1. Disconnect the heater lead in wires.
2. Using an ohmmeter, check heater continuity - should
test continuous. If not, replace.
S-18A Checking Crankcase Heater Thermostat
NOTE: Not all models with crankcase heaters will have a
crankcase heater thermostat.
1. Install a thermocouple type temperature test lead on
the discharge line adjacent to the crankcase heater
thermostat.
2. Check the temperature at which the control closes its
contacts by lowering the temperature of the control.
The crankcase heater thermostat should close at 67°F
± 5°F.