Carrier AQUASNAP 30RBP - 11 - MAIN COMPONENTS OF THE UNIT AND OPERATING CHARACTERISTICS; 11.1 - Compressors

11 - MAIN COMPONENTS OF THE UNIT AND OPERATING CHARACTERISTICS
11.1 - Compressors
The units use hermetic scroll compressors.
Each compressor is equipped as standard with a crankcase oil
heater, and with a head heater for certain congurations.
There is no heater fault detection.
Each compressor sub-function is equipped with:
■ Anti-vibration mountings between the unit chassis and the
chassis of the compressor sub-assembly,
■ A safety pressure switch on the discharge line of each circuit,
■ Pressure and temperature sensors at the common suction line
and a pressure sensor at the common discharge line.
■ A suction shut-o󰀨 valve (for 30RQ/RQP units)
■ Restrictors (not visible) on certain suction pipes, to ensure oil
level equalisation between all compressors,
11.2 - Lubricant
The compressors installed on the units have an oil charge,
ensuring good lubrication under all operating conditions.
The oil level check can be done:
■ On the system: the oil levels must be greater than or equal to
half of the sight glass.
■ A few minutes after the sub-function has come to a complete
stop: the oil levels must be visible in the sight glasses.
If this is not the case, there might be a leak or an oil trap in the
circuit.
If there is an oil leak, nd and repair it, then rell with refrigerant
and oil.
See the Service Guide for the oil removal and rell procedures.
IMPORTANT: Too much oil in the circuit can cause the unit
to malfunction.
NOTE:
Only use oils which have been approved for the compressors.
Never use used oil or oil which has been exposed to air.
IMPORTANT: Polyolester oils are completely incompatible
with mineral oils.
Only use the oils specied by the manufacturer.
11.3 - Air-cooled exchanger
30RB/RBP units are equipped with all-aluminium micro-channel
coils (MCHE).
30RQ/RQP units are equipped with coils with aluminium ns
crimped onto internally grooved copper tubes (RTPF).
58