5 Once the compressor stops, close
the discharge service valve on the
compressor (this valve is optional
on RTAD).
6 The remaining refrigerant needs to
be recovered from the suction line
service valve. Attach the inlet of a
recovery system to the port of the
charging valve. Attach the outlet of
the recovery system to the
manifold gauge set that is already
attached to the access port on the
liquid line service valve. The
condenser will be used as a
storage vessel.
7 Complete all necessary repairs.
8 Evacuate out of the suction line
service charging valve.
9 Break the vaccum by adding
refrigerant in the suction line
through the service valve.
10 Open all valves, start the unit and
verify the refrigerant charge by
measuring the subcooling.
Isolating the refrigerant
charge in the low pressure
side for High Side Repairs
If the refrigerant charge needs to be
isolated in the low side of the unit,
perform the following procedures:
1 Press the STOP key and send the
unit to a stopping mode.
2 Close the discharge service valve
(optional on RTAD).
3 Before closing the liquid line
service valve, attach a manifold
gauge set to the liquid line
backseat port.
4 Close the liquid line service valve.
5 Attach the inlet of a liquid transfer
pump to the manifold gauge set
and the outlet of the service valve
mounted on the suction line.
This will transfer the liquid
refrigerant. As the low pressure side
cannot contain all the charge, the
remaining refrigerant will be
transferred to a separate vessel.
6 Remove all of the vapor from the
high side of the system.
7 Complete all necessary repairs.
8 Evacuate the high side through the
access port on the liquid line
service valve.
9 Open all the valves and run the
unit. Verify the refrigerant charge
by measuring the subcooling.
Isolating the refrigerant
charge in the high pressure
side for Low Side Repairs.
To perform this operation the unit
must be equipped with the optional
discharge service valve
If the refrigerant charge needs to be
isolated in the high side of the unit,
perform the following procedures:
1 Press the STOP key and send the
unit to a stopping mode.
2 Place a manifold gauge set on the
backseat port of the liquid line
servive valve before actually
closing the valve.
3 Close the liquid line service valve.
4 While the unit is in the STOP
mode, enable Service Pumpdown
for the specific compressor.
Service Pumpdown is found under
the Service Tests menu of the
UCM-CLD.
Note
:
Service Pumpdown can only
be enabled for one compressor at a
time. Only one pumpdown per
compressor can be performed, until
the unit has been reset.
With Service Pumpdown enabled,
the Restart inhibit will be ignored,
the EXV will be prepositioned and
the selected compressor will start
and run for one minute.
78 RTAD-SVX01F-E4
Maintenance Procedures
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