Schreiber Chillers 15MEDAC email - Manual (Page 15)

INITIAL POWER UP:
This function and the proceeding function should be performed by an experienced or
certified HVAC technician.
NOTE: For the visual inspection of the controller feature procedure, it may be more
convenient to use the remote terminal. It can be removed from the way bracket and
unplugged, and plugged into the chiller with another short length of grounded
conductor 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 enabled 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.
Look at the coup0ling between the motor and pump. The rotation is CLOCKWISE if
looking at the front of the 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.