Carrier AquaEdge 19XR Series Start-Up, Operation And Maintenance Instructions Manual page 38

TRIMMING REFRIGERANT CHARGE
The 19XR chiller is shipped with the correct charge for the design
duty of the chiller. Trimming the charge can best be accomplished
when the design load is available. To trim the charge, check the
temperature difference between the leaving chilled water tempera-
ture and cooler refrigerant temperature at full load design condi-
tions. If necessary, add or remove refrigerant to bring the tempera-
ture difference to design conditions or minimum differential. See
SERVICE VALVE ON
=
PUMPOUT UNIT
= MAINTAIN AT LEAST 2 FT (610mm) CLEARANCE AROUND
STORAGE TANK FOR SERVICE AND OPERATION WORK.
Fig. 40 — Typical Optional Pumpout System Piping Schematic with Storage Tank
SERVICE VALVE ON
=
PUMPOUT UNIT
Fig. 41 — Typical Free-Standing Pumpout System Piping Schematic without Storage Tank
CHILLER
CONDENSER
VESSEL
CHILLER
COOLER
VESSEL
COOLER
11
REFRIGERANT
ISOLATION
VALVE
7
LIQUID LINE
SERVICE
VALVE
PUMPOUT
COMPRESSOR
SERVICE VALVE ON
=
CHILLER (FIELD
SUPPLIED)
CHILLER
CONDENSER
VESSEL
CHILLER
COOLER
VESSEL
COOLER 11
REFRIGERANT
ISOLATION
VALVE
PUMPOUT
SERVICE VALVE ON
COMPRESSOR
=
CHILLER
the 19XR Installation Instructions manual for required chiller re-
frigerant charge or consult chiller nameplates.
If low load oil loss is experienced, operate the chiller at low load
with the guide vanes nearly closed and observe the flow through
the sight glass in the oil skimmer line. Under low load operation
one should be able to see a flow of bubbly oil and refrigerant in the
sight glass. If there is no visible flow, add refrigerant. If the sight
glass shows a flow of nearly clear fluid remove refrigerant.
1b
TEE FOR
CHARGING
PRESSURE
RELIEF SAFETY
VALVE
2 3
4 5
1b
7
PRESSURE
LIQUID LINE
RELIEF SAFETY
SERVICE
VALVE
VALVE
2 3
5
4
38
REFRIGERANT
CHARGING VALVE
REFRIGERANT
1a
CHARGING VALVE
STORAGE
TANK LIQUID
10
VALVE
OIL
SEPARATOR
PUMPOUT
CONDENSER
PUMPOUT
CONDENSER
WATER SUPPLY
AND RETURN
6
STORAGE TANK
a19-1721
VAPOR VALVE
REFRIGERANT
CHARGING
VALVE
REFRIGERANT
1a
CHARGING
VALVE
OIL
SEPARATOR
PUMPOUT
CONDENSER
PUMPOUT
CONDENSER
WATER SUPPLY
a19-1722
AND RETURN