Carrier AquaEdge 23XRV Start-Up, Operation And Maintenance Instructions Manual page 39

1. 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 approximately 15 minutes.
b. Alternate method: Use this method if no charging hose
available. Slowly open the motor cooling isolation valve.
The chiller cooler and condenser pressures will gradually
equalize. This process takes approximately 15 minutes.
Note that for option (b), since the condenser contains liquid
refrigerant, the valve opening must be limited to prevent liq-
uid refrigerant from entering the cooler which could cause
potential freeze-up.
2. Once the pressures have equalized, the following isolation
valves should be opened:
• discharge isolation valve
• cooler inlet valve
• HGBP isolation valve
• 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 9-12 for isolation valve locations.
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.
CHILLER EQUALIZATION WITH PUMPOUT UNIT
The following steps describe how to equalize refrigerant pressure
on an isolated 23XRV chiller using the pumpout unit.
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.
IMPORTANT: Turn on the chilled liquid and condenser liquid
pumps to prevent possible freezing.
1. Refer to Fig. 27-30. 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 pres-
sure. This process takes approximately 15 minutes.
2. Once the pressures have equalized, the following isolation
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 54 for isolation
valve locations.
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. Open-
ing of the valve during service would result in the release of
the refrigerant charge which could result in severe personal
injury or death.
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 determined by
adding the condenser charge to the cooler charge as listed in Ta-
bles 10 and 11.
Always operate the condenser and chilled liquid pumps when-
ever charging, transferring, or removing refrigerant from the
chiller to prevent damage to the heat exchanger tubes.
39
WARNING
CAUTION