Instruction manual

Maximum Series Portable Chiller : Air & Water-Cooled : M1 Series Instrument
Page: 39
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: [phone]
Service Department Fax: [phone]
Email: [e-mail]
2. Fan motor not operating. Have electrician check fuses and
wiring, motor starter and overloads, and motor. Repair or
replace motor if defective.
B. Water-cooled units:
1. Water regulator valve. Adjust condenser water regulator
valve to maintain 100°F to 105°F refrigerant condensing
temperature*. If valve is defective, have valve repaired or
replaced by a refrigeration serviceman.
2. The water regulator valve is normally factory set for proper
operation.Wheneldadjustmentsarerequired,turnthe
adjusting nut on the top of the valve counter clockwise to
raise the refrigerant pressure and clockwise to lower the
pressure. Adjustments should be made only when the chiller
is running at full load.
3. Insufcient condenser water ow. Check condenser
water pumping system.
4. Condenser water temperature too high. Check cooling
tower for proper operation if used and the city water
temperature if city water is used.
5. Condenser water tubes scaled. Clean with brushes and
chemicals approved by the Advantage Service Department.
C. Improperly set high pressure control. Have refrigeration
serviceman reset or replace the control if defective.
4.4 SHUTS OFF ON LOW PRESSURE CONTROL
Note: Units may be equipped with either an adjustable
ornon-adjustable“xed”lowpressureswitch.
Theadjustableorxedlowpressureswitchwill
automatically resets when the pressure rises
above the cut-in pressure. If this does not occur
contacttheManufacturer’sservicedepartmentfor
instructions.
If the unit low pressure limit is activated three (3)
consecutive times during start-up the unit will lock
out and will not be allowed to start. When the
chiller control locks out due to low pressure after
three (3) attempts, there is a problem that must be
resolved before the unit should be restarted. To
re-start, the unit must be powered down and back
on. This should only be attempted after the cause of
the low pressure condition has been found and the
issue has been resolved. Repeatedly re-starting the unit will cause
damage to the unit often including freezing and rupture of the chiller
evaporator.
* See Temperature-Pressure
chart in Section 8.2 for
refrigerant pressure.
Adjustable Low
Pressure Switch
Fixed Low
Pressure Switch