Check Pumpout System Controls And Optional Pumpout Compressor; High Altitude Locations; Charge Refrigerant Into Machine - Carrier 17 Start Up & Operation Manual

Table 7 — Control Test Menu Functions
TESTS TO BE
PERFORMED
1. Automated Tests* Operates the second through seventh
tests
2. PSIO Thermistors Entering chilled water
Leaving chilled water
Entering condenser water
Leaving condenser water
Discharge temperature
Bearing temperature
Motor winding temperature
Oil sump temperature
3. Options Thermistors Common chilled water supply sensor
Common chilled water return sensor
Remote reset sensor
Temperature sensor — Spare 1
4. Transducers Evaporator pressure
Condenser pressure
Oil pressure differential†
Oil pump pressure**
5. Guide Vane Actuator Open
Close
6. Pumps All pumps or individual pumps may be
activated:
Oil pump — Confirm pressure
Chilled water pump — Confirm flow
Condenser water pump — Confirm flow
Auxiliary oil pump — confirm
pressure†
7. Discrete Outputs All outputs or individual outputs may
be energized:
Hot gas bypass relay
Oil heater relay
Motor cooling relay**
Tower fan relay
Alarm relay
Shunt trip relay
8. Pumpdown/Lockout When using pumpdown/lockout,
observe freeze up precautions when
removing charge:
Instructs operator as to which valves
to close and when
Starts chilled water and condenser wa-
ter pumps and confirms flows
Monitors — Evaporator pressure
Turns pumps off after pumpdown
Locks out compressor
9. Terminate Lockout Starts pumps and monitors flows
Instructs operator as to which values
to open and when
Monitors — Evaporator pressure
Terminates compressor lockout
*During any of the tests that are not automated, an out-of-range read-
ing will have an asterisk (*) next to the reading and a message will
be displayed.
†On open-drive machines, differential pressure is the only oil pres-
sure displayed.
**Displayed only on hermetic machines.
DEVICES TESTED
Spare 2
Spare 3
Spare 4
Spare 5
Spare 6
Spare 7
Spare 8
Spare 9
Condenser pressure
Evaporator temperature
during pumpout
procedures
Condenser pressure
Evaporator temperature
during charging process
Check Pumpout System Controls and Optional
Pumpout Compressor —
switch, a 3-amp fuse, the compressor overloads, an internal
thermostat, a compressor contactor, and a refrigerant high
pressure cutout. The high pressure cutout is factory set to
open at 161 psig (1110 kPa) and reset at 130 psig (896 kPa).
Check that the water-cooled condenser has been connected.
Loosen the compressor holddown bolts to allow free spring
travel. Open the compressor suction and discharge service
valves. Check that oil is visible in the compressor sight glass.
Add oil if necessary.
See Pumpout and Refrigerant Transfer Procedures
(page 64) and Pumpout System Maintenance sections
(page 82) for details on transfer of refrigerant, oil specifi-
cations, etc.
High Altitude Locations —
sure transducers will be necessary as the machine was ini-
tially calibrated at sea level. Please see the calibration pro-
cedure in the Troubleshooting Guide section.

Charge Refrigerant into Machine

The transfer, addition, or removal of refrigerant in spring
isolated machines may place severe stress on external
piping if springs have not been blocked in both up and
down directions.
The 17/19EX machine may have the refrigerant already
charged in the utility vessels. If machine is not shipped fully
charged, refrigerant is shipped separately to conform with
transportation regulations. The 17/19EX may be ordered with
a nitrogen holding charge of 15 psig (103 kPa). Evacuate the
entire machine, and charge machine from refrigerant
cylinders.
The full refrigerant charge on the 17/19EX will vary with
machine components and design conditions, indicated on the
job data specifications. An approximate charge may be found
in 17/19EX Physical Data section, page 97. The full ma-
chine charge is printed on the machine identification label.
Always operate the condenser and chilled water pumps
during charging operations to prevent freeze-ups. Use the
Controls Test Terminate Lockout to monitor conditions and
start the pumps.
If the machine has been shipped with a holding charge,
the refrigerant will be added through the refrigerant charg-
ing valve (Fig. 8) or to the pumpout charging connection.
First evacuate the nitrogen holding charge from the vessels.
Charge the refrigerant as a gas until the system pressure ex-
ceeds 35 psig (141 kPa). After the machine is beyond this
pressure the refrigerant should be charged as a liquid until
all of the recommended refrigerant charge has been added.
TRIMMING REFRIGERANT CHARGE — The 17/19EX
is shipped with the correct charge for the design duty of the
machine. Trimming the charge can be best accomplished when
design load is available. To trim, check the temperature dif-
ference between leaving chilled water temperature and cooler
refrigerant temperature at full load design conditions. If nec-
essary, add or remove refrigerant to bring the temperature
difference to design conditions or a minimum differential.
57
Controls include an on/off
Recalibration of the pres-