22
APP-001f
SEPT 2016
SECTION 5 SERVICE, TROUBLESHOOTING, & PARTS
PURGER PUMP OUT PROCEDURE
1) Close the purge gas gauge valve to the water bubbler.
2) Close the low-pressure pumped-liquid line shut-off valve.
3) Close the foul gas line shut-off valve.
4) Close the water bubbler fill line valve.
The purger will pump down in several hours. To accelerate
the process, attach ammonia hoses to the oil drain
valves and pump out into a suction line. After all liquid is
removed, close the low-pressure liquid return line shut-off
valve and the suction line stop/check valve to isolate the
purger. With electricity on, the pressure in the purger, as
indicated by both the high side pressure gauge and the
low side pressure gauge, should remain at zero. After
the purger is completely pumped-out, turn off electricity
to the purger. This process should be completed only by
knowledgeable refrigeration technicians.
SERVICE AND MAINTENANCE
Under normal operating conditions the purger may collect
refrigerant oil. The purger should be drained every 6
months (more frequent if oil accumulation is significant) to
remove the refrigerant oil. Failure to remove the collected
refrigerant oil will inhibit the water concentration mode
of the purger.
The following components must be checked when the
refrigerant oil is manually drained:
1. Low liquid level sensor (SPSN-1)
2. Liquid level make-up sensor (SPSN-1)
3. HPT717 water concentration sensor
Confirm proper operation of the sensors after draining
the oil. For detailed instructions refer to Hansen Product
Bulletins P105b for SPSN-1 and PT100c for HPT717.
REPLACEMENT OF THE PLC BACKUP
BATTERY
The replacement battery is DURACELL DL2032 or RAYOVAC
CR2032.
A 3.0V lithium coin cell battery is used to provide backup
power for air purge minutes, air purge cycles, water
release minutes and water release cycles. The battery and
battery low indicator are located in the lower right corner
of the plc, see Figure 8. On certain models, the battery is
located underneath a control module. The battery should
be replaced every 5 years or when the LOW BATTERY
LED is illuminated.
To replace the battery, the power to the APPT must be
ON. Lift the battery tab and press the battery out with
your finger or a non-metallic tool. When installing a new
battery, the battery polarity “+” must be to the top side.
Lift the battery tab and slide the battery into place. Verify
the LOW BATTERY LED is not illuminated.
DL2032
3V
LO
W
BATTER
Y
CP
U
PW
R
DS
7
DS
6
DS
5
RAM BACKUP
BATTERY
PLC
LOW BATTERY LED
BATTERY TAB
BATTERY REPLACEMENT
Figure 8
