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START-UP
Start up of condensing unit
- Open all the valves (compressor suction and discharge, in and out liquidreceiver),
- Place an ammeter on one phase of thecompressor
- Start up compressor by switching the on/off switch toon.
The current increases to maximum and should decrease very rapidly. If this does not happen, stop the compressor to check and find
the fault.
Following HP pressure settings, condenser fan(s) should cut or run at a low speed (see chapter 8).
Remainder
of charge
Fill up with the remainder very quickly.
An incomplete charge of fluid will cause considerable superheat and so abnormally high discharge temperatures.
OPERATING CHECKS
Shortly after start-up, the operating conditions of the equipment must be checked.
Compressor
The compressor must operate within its acceptable limits
-
(see Manufacturer'sadvice).
Check :
-
Current,
Dischargepressure,
Measure suctiontemperature,
Measure dischargetemperature,
Measure crankcase temperature acting at the oil drain plug.
The intake superheat must not exceed 20K and should not fallbelow 10K.
-
and ensure that the charge in the condensing unit is correct.
-
The crankcase temperature must not fallbelow40°/45°C
Very important:
There is no need to add oil over and above the required quantity (see chapter 3).
F
an
Check the current absorbed from the motor.
Therefore adjust the thermostaticexpansion valve
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