Starting Up & Operation; Evacuation; Charging Procedure; Refrigerant Charging Procedure - Emerson Copeland EazyCool ZX Series Manual

4 Starting up & operation
Before commissioning, ensure that all Rotalock valves and other valves on the condensing unit
are fully opened.
4.1

Evacuation

NOTE: The following procedure is based upon achieving an actual system vacuum
standard and is NOT TIME DEPENDENT!
Step-by-step:

Check suction capability of the vacuum pump with a gauge before commencing evacuation
process. The vacuum pump must be rated to achieve at least 300 microns vacuum levels.

Connect the vacuum gauge to the system. We have included a convenient point for this on
the ZX unit.

It is recommended to carry out a three-time evacuation process as detailed below:

Start the vacuum pump and then open the main valve. At this point it is assumed that the
liquid line solenoid is energized, the cabinet (evaporator) fans run and the compressor
crankcase heaters are energized. This will involve powering up the unit so it is important to
disconnect the live feed wire to the compressor contactor (so the compressor cannot run
and the crankcase heaters can be energized).
NOTE: Ensure that the vacuum pump cannot be switched off during the evacuation
process, otherwise the pump may lose its lubrication oil to the system and contaminate it.
Therefore the pump must have a vacuum breaker fitted to it.
st

1 time vacuum: Bring system down to 1500 microns and then break vacuum to 2 psig with
the same refrigerant.
nd

2 time vacuum: Same as the 1st time vacuum
rd

3 time vacuum: Leave the pump running while checking the vacuum regularly. The target
system vacuum is 500 microns.

Once the target vacuum level is reached, the quality of the vacuum within the system must
be tested. This is achieved by shutting off the main pump valve, allowing the internal system
pressure to rise and recording the time taken for the vacuum to rise by no more than 300
microns within 30 minutes, ie; to 100 microns.

This process is only complete once the vacuum quality is achieved. Then close the two
manifold valves tightly. Close the pump main valve, switch off and remove the vacuum
pump.
4.2

Charging procedure

4.2.1 Refrigerant charging procedure

IMPORTANT
The Scroll compressor design requires system charging as quickly as
possible with liquid refrigerant into the liquid line. This will avoid running the
compressor under conditions whereby insufficient suction gas is available to
cool not only the motor but also the rotating scrolls. Temperature builds up
very quickly in the scrolls if this is not done!
IMPORTANT
Do not vapour (gas) charge the ZX Scroll unit!
The suction service valve must not be fully closed at any time when the
compressor is running. To do so would cause damage to the compressor in
the same manner as explained above. This valve is provided for ease of
connection and for the fitting of service gauges without removing the unit
panel.
Step-by-step:

Ensure that there is no power supply to the ZX unit. The liquid line solenoid needs to be kept
open for the charging process and this may require a temporary power feed to it. At this
point it is all right to leave the crankcase heater off.

Connect the refrigerant cylinder to main service hose and purge line at the manifold end.
C6.1.6/1108-0509/E 19