Specifications

Table 6 — Control Test Menu Functions
TESTS TO BE
PERFORMED
DEVICES TESTED
1. CCM Thermistors Entering Chilled Water
Leaving Chilled Water
Entering Condenser Water
Leaving Condenser Water
Remote Reset Sensor
Comp Discharge Temp
Comp Thrust Bearing Temp
Oil Sump Temp
Comp Motor Winding Temp
Spare Temperature 1
Space Temperature 2
2. CCM Pressure
Transducers
Evaporator Pressure
Condenser Pressure
Oil Pump Delta P
Spare Pressure Delta P
Condenser Water Delta P
Transducer Voltage Ref
3. Pumps Oil Pump — Confirm pressure
Chilled Water — Confirm Delta P
Condenser Water — Confirm
Delta P
4. Discrete Outputs Oil Heater Relay
Hot Gas Bypass Relay
Tower Fan Relay Low
Tower Fan Relay High
Alarm Relay
Shunt Trip Relay
5. Guide Vane Actuator Open/Close
6. Pumpdown/Lockout When using pumpdown/lockout,
observe freeze up precautions when
removing charge:
Instructs operator which valves to
close and when.
Starts chilled water and condenser
water pumps and confirms flows.
Monitors
Evaporator pressure
Condenser pressure
Evaporator temperature during
pumpout procedures
Turns pumps off after pumpdown.
Locks out compressor.
7. Terminate Lockout Starts pumps and monitors flows.
Instructs operator which valves to
open and when.
Monitors
Evaporator pressure
Condenser pressure
Evaporator temperature during
charging process
Terminates compressor lockout.
8. Guide Valve Calibration Calibrates guide vane input on CCM
Charge Refrigerant into Chiller
The transfer, addition, or removal of refrigerant in spring
isolated chillers may place severe stress on external pip-
ing if springs have not been blocked in both up and down
directions.
Always operate the condenser and chilled water pumps
during charging operations to prevent freeze-ups.
The standard 19XRT chiller is shipped with the refriger-
ant already charged in the vessels. However, the 19XRT may
be ordered with a nitrogen holding charge of 15 psig
(103 kPa). Evacuate the nitrogen from the entire chiller, and
charge the chiller from refrigerant cylinders.
CHILLER EQUALIZATION WITHOUT A PUMPOUT
UNIT
When equalizing refrigerant pressure on the 19XR chiller
after service work or during the initial chiller start-up,
do not use the discharge isolation valve to equalize.
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 equal-
ization valve.
To equalize the pressure differential on a refrigerant iso-
lated 19XRT 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 19XRT chiller without a pumpout unit.
1. Access terminate lockout function on the CONTROL TEST
screen.
IMPORTANT: Turn on the chilled water and con-
denser water pumps to prevent freezing.
2.
3. Slowly open the refrigerant cooling isolation valve. The
chiller cooler and condenser pressures will gradually equal-
ize. This process takes approximately 15 minutes.
4. Once the pressures have equalized, the cooler isolation
valve, the condenser isolation valve, and the hot gas iso-
lation valve may now be opened. Refer to Fig. 26 and 27,
for the location of the valves.
Whenever turning the discharge isolation valve, be
sure to reattach the valve locking device. This pre-
vents the valve from opening or closing during serv-
ice work or during chiller operation.
CHILLER EQUALIZATION WITH PUMPOUT UNIT —
The following steps describe how to equalize refrigerant pres-
sure on an isolated 19XRT chiller using the pumpout unit.
1. Access the terminate lockout function on the CONTROL
TEST screen.
IMPORTANT: Turn on the chilled water and con-
denser water pumps to prevent possible freezing.
2.
3. Open valve 4 on the pumpout unit and open valves 1a
and 1b on the chiller cooler and condenser, Fig. 26 and
27. 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 discharge isola-
tion valve, cooler isolation valve, optional hot gas bypass
isolation valve, and the refrigerant isolation valve can be
opened. Close valves 1a and 1b, and all pumpout unit
valves.
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