Advantage BC-N4 Series, Инструкция по эксплуатации

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BC-N4 Glycol Chiller
Page: 35
ADVANTAGE ENGINEERING, INC.
525 East Stop 18 Road Greenwood, Indiana 46142
317-887-0729 Fax: 317-881-1277
Service Department Fax: 317-885-8683
Email: service@AdvantageEngineering.com
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 “fixed” low pressure switch. The adjustable or
fixed 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.
The low pressure switch is set to cut-out at 32°F and cut-in at 36°F - 39°F*. If a
low pressure condition exists for more than five seconds the compressor will stop
and a “L-P” fault will appear in the display window.
After the refrigerant pressure rises above the cut-in pressure, a three minute time
delay will occur before the compressor restarts. This will protect the evaporator
and compressor from damage should a problem occur in the refrigeration system
or if the chiller is operated under circumstances which could cause damage to
the refrigeration system.
A. Low or no water flow through the evaporator. Adjust the flow per section 3.2.C
B. Air-cooled units:
Head pressure too low. Check that entering air temperature is above 60°F. If
below 60°F, find out reason why.
C. Low refrigerant charge. Check for adequate refrigerant charge (bubbles or misty
sight glass indicates low charge). If charge is low, have system checked for leaks and
recharged by a refrigeration serviceman.
D. Improperly set low pressure switch. Have a refrigeration serviceman reset control or
replace if defective.
E. Restriction in the liquid line.
1. Clogged filter drier. Check for pressure or temperature drop and have drier core
replaced by a refrigeration serviceman.
* See Temperature-Pressure
chart in Section 8.2 for
refrigerant pressure.
Adjustable Low
Pressure Switch
Fixed Low
Pressure Switch