Major System Components; Compression Function - Carrier 30KAV-ZE Series Installation, Operation And Maintenance Instructions

6 - MAJOR SYSTEM COMPONENTS

6.1 - Compression function

6.1.1 - Compressors
The units use 06Z twin-screw compressors fitted with an
asynchronous motor. 30KAVPZE units use 06Z twin-screw
compressors fitted with a synchronous motor featuring a
permanent magnet. All these units are controlled by a speed
regulator.
Motor temperature
sensor
Economiser port
Electrical
Oil pressure
power
transducer
terminals
Discharge pressure
transducer
VI control
Oil return
Oil valve
On the compressor with a synchronous motor featuring permanent
magnets (30KAVPZE), it is prohibited to attempt to remove the
motor from the compressor, due to its strong magnetic field.
6.1.2 - Refrigerant
This document concerns the 30KAV-ZE / 30KAVPZE / 30KAVIZE
which operates using R1234ze(E) only.
6.1.3 - Economiser and suction filters
To improve the reliability of the compressor, filters are fitted on the
compressor suction connection and economiser port, as standard.
42
HP pressure
switches
Discharge
Discharge
temperature
sensor
Variable VI
(Volume Index)
piston
Suction
temperature
sensor
6.1.4 - Lubricant oil
The 06Z screw compressor is approved for use with the following
lubricants:
Hatcol 4496 (Carrier specification PP47-38).
Contact ERCD to purchase oil top up
CAUTION: Too much oil in the circuit can cause the unit to
malfunction.
NOTE : Never use oils that have been exposed to air.
6.1.5 - Oil supply solenoid valve
An oil supply solenoid valve is installed on the oil return line as
standard to isolate the compressor from oil flow when the
compressor is not operating. The oil solenoid valve is field
replaceable.
6.1.6 - Oil filter
The 06Z screw compressor has an independent oil filter mounted
on the oil separator. This filter is field replaceable.
6.1.7 - Oil separator
On these units, the oil separator is a pressure vessel which is
mounted underneath the condenser coils, at the compressor
discharge. The gas discharged at the compressor outlet is directed
to the oil separator and most of the oil is separated from the gas
by a process of rapid deceleration and gravity. The gas is then
directed to a mesh filter where the remaining oil is separated by
coalescence, and flows to the bottom of the vessel. The oil-free
gas exits via the top of the vessel towards the condenser.
The oil separator is equipped with a heater cable managed by the
control system. The oil separator also has a built-in silencer.
Suction