Schreiber Chillers 15MEDAC email - Manual (Page 16)

FANS:
The fans should be spinning CLOCKWISE when looking down on the fan. Air should be
drawn from the bottom of the chiller and discharged out through the top.
SYSTEM START:
Be sure there are no alarm faults present.
Sometimes it is necessary to fill the piping system. Therefore, pump can be enabled
manually. At the same time, it is recommended that the operation of each pump is
verified.
NOTE: When two pumps are enabled, disable any one pump will leave other operation.
In a normal operation, pumps 1 &2 are in the “ON” position and they are left to run
automatically.
The pressure relief valve is pre-set at 45 psig.
When the pressure on the water line is increased above 45 psig, this valve will open
and allow some water to bypass the external heat exchange. The adjustment of this
valve is not required when it does not meet the specification. If adjustment is required,
always set the pressure 5psi above the specified pressure. This is recommended to
overcome the pressure drop within the chiller.
REFRIGERATION SYSTEM START-UP:
At the On/Off screen, the pumps can now be turned on. All the pumps to run for one
minute prior to turning on the compressor. This is also necessary to ensure the “flow
error” alarm is not present.
NOTE: To get the most accurate start-up situation, there should be an actual load on
the chiller. If there is no load on the chiller, the discharge temperature set point should
be raised so that the refrigeration system will not get the water too cold.
See the control system for instructions to change the set point.
System 1:
Verify that pump 1 is on. Compressor 1 and compressor 2 should be off. Check the
units (C or F, psi or bar). Change the units to whatever system is required. They should
be changed before permanent settings are made, because they only change the display
of sensor values, not setpoint values. For example, if the reservoir is at 68 F, and the
setpoint is 50 F, changing the units to C will change the reservoir temperature display
to 20 C, but the setpoint will be 50 C, not 10 C.
Check the setpoints by pressing the SET button. They should match the default
settings listed in the MAINTENANCE section.