80
the CONTROL TEST on the SERVICE menu. This helps to
turn on pumps and advises the operator on proper procedures.
The following steps describe how to equalize refrigerant
pressure in an isolated 23XRV chiller without a pumpout unit.
1. Access TERMINATE LOCKOUT function on the CON-
TROL TEST screen.
2.
3. Equalizing:
a. Preferred method: Connect a charging hose
between the two valves on top of the cooler and
condenser. Open one valve fully and open the other
valve slowly. This process should take approxi-
mately 15 minutes.
b. Alternate method: Use this method if no charging
hose available. Slowly open the motor cooling isola-
tion valve. The chiller cooler and condenser pressures
will gradually equalize. This process takes approxi-
mately 15 minutes.
Note that for option (b), since the condenser con-
tains liquid refrigerant, the valve opening must be
limited to prevent liquid refrigerant from entering
the cooler which could cause potential freeze-up.
4. Once the pressures have equalized, the following isola-
tion valves should be opened:
• discharge isolation valve
• cooler inlet valve
• HGBP isolation valve (optional)
• vaporizer condenser gas valve
• filter/drier isolation valve (2 places)
• VFD cooling isolation valves (2 places)
• oil filter isolation valve
• oil pump isolation valve
• oil pressure regulator valve
Refer to Fig. 2-4 and 10-13 for isolation valve locations.
CHILLER EQUALIZATION WITH PUMPOUT UNIT —
The following steps describe how to equalize refrigerant pres-
sure on an isolated 23XRV chiller using the pumpout unit.
NOTE: The top valve tee on a unit-mounted pumpout is
connected to the condenser and the bottom valve tee is
connected to the cooler. This is different from unit-mounted
installations on other Carrier chillers.
1. Access the TERMINATE LOCKOUT function on the
CONTROL TEST screen.
2.
3. Refer to Fig. 40-43. Open valve 4 on the pumpout unit
and open valves 1a and 1b on the chiller cooler and
condenser. Slowly open valve 2 on the pumpout unit to
equalize the pressure. This process takes approxi-
mately 15 minutes.
4. Once the pressures have equalized, the following iso-
lation valves should be opened:
• discharge isolation valve
• cooler inlet valve
• hot gas bypass valve
• vaporizer condenser gas valve
• oil pump valve
• oil filter valve
• oil pressure regulator valve
• filter/drier valve (2 places)
• VFD cooling inlet valve
• VFD cooling drain valve
Refer to Fig. 2-7 and Oil Heater section on page 91 for iso-
lation valve locations.
The full refrigerant charge on the 23XRV chiller will vary
with chiller components and design conditions, as indicated on
the job data specifications. An approximate charge may be de-
termined by adding the condenser charge to the cooler charge
as listed in Tables 16 and 17.
CAUTION
Whenever turning the discharge isolation valve, be sure that
the spring-loaded lever lock fully engages within one of the
latch plate detents. This will prevent the valve from opening
or closing during service work or during chiller operation.
IMPORTANT: Turn on the chilled liquid and con-
denser liquid pumps to prevent freezing.
WARNING
Whenever turning the discharge isolation valve, be sure
that the spring-loaded lever lock fully engages within one
of the latch plate detents. This will prevent the valve from
opening or closing during service work or during chiller
operation. Opening of the valve during service would result
in the release of the refrigerant charge which could result in
severe personal injury or death.
CAUTION
Always operate the condenser and chilled liquid pumps
whenever charging, transferring, or removing refrigerant
from the chiller to prevent damage to the heat exchanger
tubes.
IMPORTANT: Turn on the chilled liquid and
condenser liquid pumps to prevent possible freezing.
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