Specifications

63
Charge Refrigerant into Chiller
The standard 23XRV chiller is shipped with the refrigerant
already charged in the vessels. However, the 23XRV chiller
may be ordered with a nitrogen holding charge of 15 psig
(103 kPa). In this case, evacuate the nitrogen from the entire
chiller, and charge the chiller from refrigerant cylinders.
Chillers shipped with a factory charge should arrive with all
isolation valves in the open position. Figures 2 and 8 show the
location of the isolation valves listed in the Initial Start-Up
Checklist.
CHILLER EQUALIZATION WITHOUT A PUMPOUT
UNIT
To equalize the pressure differential on a refrigerant isolated
23XRV chiller, use the TERMINATE LOCKOUT function of
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. Slowly open the motor cooling isolation valve. The chill-
er cooler and condenser pressures will gradually equalize.
This process takes approximately 15 minutes.
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 and 8 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 con-
nected 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. 33. Open valve 4 on the pumpout unit
and open valves 1a and 1b on the chiller cooler and
condenser, Fig. 30-33. Slowly open valve 2 on the
pumpout unit to equalize the pressure. This process
takes approximately 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 pages 5, 6, 11 and 75 for isolation 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 Table 13.
CAUTION
The 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. Failure to block springs in both up and down
directions could result in severe personal injury and equip-
ment damage.
CAUTION
Always operate the condenser and chilled liquid pumps
during charging operations to prevent freeze-ups. Damage
may result to equipment if the condenser and chilled water
pumps are not operated during pumpdown or charging.
WARNING
When equalizing refrigerant pressure on the 23XRV chiller
after service work or during the initial chiller start-up, do
not use the discharge isolation valve to equalize because
the force that could be exerted by the valve handle could
cause personal injury. Either the motor cooling isolation
valve or the charging hose (connected between the
pumpout valves on top of the cooler and condenser) should
be used as the equalization valve.
IMPORTANT: Turn on the chilled liquid and con-
denser liquid pumps to prevent freezing.
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.
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.