Schreiber Chillers 15medWC - Manual (Page 19)

Initial Power Up
NOTE: For the checkout procedure, it may be more convenient to use the remote terminal. It can
be removed from the wall bracket and unplugged, and plugged into the chiller with another short
length of telephone cable. All procedures are described using the terminal shortcut keys, but can
be accessed through the menu on the built in display of the controller. See the controller
operation section for more detail.
• If all above procedures are performed and acceptable, turn on the main chiller
disconnect
• Check for and correct any alarms.
• Go to the MANUAL CONTRL screen. The password is 177. (See Maintenance section
of this manual for more detail on manual control
• Go to DIGITAL OUTPUTS
• Scroll through the screens to check rotation and operation for each pump and
compressor. There are no safeties enable for manual operation, so each device should
only be “bumped” long enough to verify rotation.
Rotation Check:
NOTE: It is to be assumed that all of the devices are wired with the same rotation. Therefore, if a
device is running in reverse, all devices will be running in reverse. In this case the proper method
of reversing rotation is to swap two leads of the INCOMING power supply. Make sure the power
feeding the chiller is off before this is done.
It is recommended that rotation of all devices is checked before reversing any leads
• Cryo Compressor Pump (bronze PD pump)
Look at the coupling between the motor and pump. The rotation is CLOCKWISE if looking at
the front of the pump.
• GCHE/GAHE Pump (SS centrifugal pump)
Look at the exposed shaft facing the outside of the chiller. There is a rotation arrow stamped on
the pump casing and adhered to the motor. It should be rotating COUNTER-CLOCKWISE (if
looking at the motor end).
Compressors:
If the compressor is rotating correctly, the suction pressure will drop and the discharge pressure
will rise. If the rotation is not correct, the compressor will not pump and the gauges will not
change.
The compressor is also extremely noisy when running backwards. In general, an experienced
technician will not have to look at the gauges