Operate Drive; Set Purge Valves; Check Water Supply; Check Air Supply (Pneumatic Machines) - Carrier 17DA Start-Up, Operation And Maintenance Instructions Manual

4. If realignment is required, follow instructions supplied by
coupling manufacturer. Carrier Standard Service Tech-
niques, Form SM-15, Rev A, also details realignment
techniques.
It is good practice to operate the drive
Operate Drive —
uncoupled from the compressor first and then couple it to the
compressor. Refer to the drive manufacturer's instructions for
drive protection devices and settings. Check turbine overspeed
and confirm correct motor direction of rotation at this time. Re-
assemble coupling after operating the drive successfully.
NOTE: If there is a gear between the motor and compressor,
then it reverses rotation. Make sure that the gear output shaft is
turning in the correct direction.
Open all the purge service valves.
Set Purge Valves —
Check Water Supply —
condensing water and oil cooler water supplies are available
and that pumps will run before operating compressor.
Check Air Supply (Pneumatic Machines) —
Make sure that control air is 35 psig (241 kPa).

START-UP

Pre-Operation Settings —
before starting compressor for first time.
Refer to drive manufacturer's start-
Drive Operation —
up instructions. Complete drive starting requirements before
operating compressor.

Initial Refrigerant Charge

CAUTION
When liquid refrigerant R-134a is injected into a low vac-
uum of 29.48 in. (749 mm) mercury, it will immediately
flash to a gas at a temperature lower than –100 F (–73 C). It
is for this reason that water must be circulating before
charging liquid refrigerant. Non-circulating water would
quickly freeze and damage the machine. If an auxiliary
refrigerant storage tank (receiver) is furnished, then liquid
refrigerant may be charged directly into this evacuated
receiver without damage.
Large machines run with liquid refrigerant in the cooler so
refrigerant is charged into the cooler or low-pressure side of the
machine. For general instructions on how to handle refrigerant
refer to Carrier Standard Service Techniques, Form SM-1. Use
the Charging by Weight method, cross checking with the ma-
chine's refrigerant sight glass provided on the back of the cool-
er shell, and the suction pressure gage.
Charge refrigerant as follows:
1. Start cooler and condenser water circulating pumps.
2. Charge the first refrigerant in the vapor state, continuing
until the machine pressure exceeds 35 psig (241 kPa).
The refrigerant temperature corresponding to this pres-
sure is high enough to prevent water freezing damage and
will also satisfy the refrigerant low-pressure cutout safety
switch setting (31.5 psig [217 kPa]).
3. Turn the refrigerant bottles or drums over and begin
charging the refrigerant in the liquid phase. Continue
charging liquid refrigerant until about 2/3 of the estimated
full load charge is in the machine.
Be certain that chilled water,
Complete these settings

Initial Compressor Operation

Do not apply power to any system or instrument that is
exposed to dehydration vacuum. Insulation breakdown
and serious damage can result.
1. Energize the control panel.
2. Place the guide vanes in MANUAL operation.
3. Manually energize the oil cooler solenoid and verify flow
through the oil cooler. Return the solenoid to automatic
control.
4. Observe whether the compressor shaft moves forward
(toward the suction) off the shutdown seal. Manually en-
ergize a compressor oil pump. Observe the shaft and veri-
fy that the seal movement indication changes on the PLC.
5. Turn off the oil pump and observe the shaft move back to-
ward the driver. The PLC should indicate that the shut-
down seal is closed. If the PLC does not indicate the shaft
position to be on the shutdown seal, terminate the startup.
Correct the shaft feedback before attempting a start to
prevent damage to the shaft and seal.
6. Place Compressor Oil Pumps into AUTOMATIC mode.
7. Place Capacity Control in MANUAL mode.
8. Open all valves to seal oil separator pot. Energize the sep-
aration pot heater if manually controlled. If the heater is
PLC controlled verify its operation after the compressor
starts.
9. Ensure that there is water in the cooling tower and that it
is operational.
No brine or water over 100 F (37 C) can be allowed to flow
through the cooler. Damage to unit will result.
10. Open chilled and condenser water valves and start the
water pumps. If these are automatically controlled, verify
that they have opened and started.
11. Start the compressor and let it run for approximately
5 minutes. While it is running, observe bearing tempera-
tures, vibration levels, and oil pressure. Listen for unusual
sounds.
12. Stop the compressor. During coast down again verify that
the compressor is rotating in the correct direction which is
counterclockwise if it is seen from the drive.
13. Observe the shaft movement to verify that the shutdown
seal has closed. If the shutdown seal is manually con-
trolled, open the bleed valve on the inboard side of the
bearing chamber (inboard is the heat exchanger side.)
Adjust Refrigerant Charge —
ant charge, perform the following procedure.
1. Adjust control station to operate at MANUAL. Ensure
that the guide vanes are closed as indicated on the main
guide vane indicator.
2. The condenser liquid level control consists of a level
transmitter, the liquid line valve and a control program in
the PLC. As an initial set point, place the level setting
even with the condensed liquid thermowell. The well is
located on the same end of the vessel as the level trans-
mitter. It can be on either side of the vessel. After the ma-
chine has reached stable operation, the level should be set
such that the condensed liquid temperature is 1 to 3° F
(0.5 to 1.6° C) below saturated condensing temperature.
6
CAUTION
CAUTION
To adjust the refriger-