Pumpout And Refrigerant Transfer Procedures; Preparation - Carrier AquaEdge 19DV Series Start-Up, Operation And Maintenance Instructions Manual

PUMPOUT AND REFRIGERANT
TRANSFER PROCEDURES

Preparation

For refrigerant side service work the refrigerant can be isolated
in a storage tank. The following procedures and Fig. 38 and 39
describe how to transfer refrigerant from vessel to vessel and
perform chiller evacuation.
CAUTION
If equipped, the power to the pumpout compressor oil heat-
er must be on whenever any valve connecting the pumpout
compressor to the chiller or storage tank is open. Leaving
the heater off will result in oil dilution by refrigerant and
can lead to compressor failure. Similarly a recovery unit
suited for low pressure refrigerant should be used.
CAUTION
Always run the chiller evaporator and condenser water
pumps and always charge or transfer refrigerant as a gas
when the chiller pressure is less than –15 in. Hg (–51 kPa).
Below this pressure, liquid refrigerant flashes into gas, re-
sulting in extremely low temperatures in the evaporator/
condenser tubes and possibly causing tube freeze-up.
SERVICE VALVE ON
=
PUMPOUT UNIT
= MAINTAIN AT LEAST 2 FT (610mm) CLEARANCE AROUND
STORAGE TANK FOR SERVICE AND OPERATION WORK.
Fig. 38 — Typical Optional Pumpout System Piping Schematic with Storage Tank
CHILLER
CONDENSER
VESSEL
CHILLER
COOLER
VESSEL
11
7
LIQUID LINE
SERVICE
VALVE
PUMPOUT
COMPRESSOR
SERVICE VALVE ON
=
CHILLER (FIELD
SUPPLIED)
During transfer of refrigerant into and out of the optional
storage tank, carefully monitor the storage tank level gage.
Do not fill the tank more than 90% of capacity to allow for
refrigerant expansion. Overfilling may result in damage to
the tank or the release of refrigerant which will result in
personal injury or death.
Do not mix refrigerants from chillers that use different
compressor oils and ensure that tanks previously used with
a different refrigerant have been cleaned in order to avoid
refrigerant contamination. Compressor and heat exchanger
damage can result.
Transfer, addition, or removal of refrigerant in spring-isolated
chillers may place severe stress on external piping if springs
have not been blocked in both up and down directions.
1b REFRIGERANT
CHARGING VALVE
PRESSURE
RELIEF SAFETY
VALVE
2
3
4 5
39
WARNING
CAUTION
CAUTION
REFRIGERANT
1a
CHARGING VALVE
STORAGE
TANK LIQUID
10
VALVE
OIL
SEPARATOR
PUMPOUT
CONDENSER
PUMPOUT
CONDENSER
WATER SUPPLY
AND RETURN
6
STORAGE TANK
VAPOR VALVE