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Checking System Charge
Units are shipped with full operating charge. If recharging is
necessary:
1.
Insert thermometer bulb in insulating rubber sleeve on liquid
line near filter drier. Use a digital thermometer for all
temperature measurements. DO NOT use a mercury or
dial-type thermometer.
2.
Connect pressure gage to discharge line near compressor.
3.
After unit conditions have stabilized, read head pressure on
discharge line gauge.
NOTE: Operate unit a minimum of 15 minutes before
checking
charge.
Pressure-Temperature chart for R-410A, find equivalent
saturated condensing temperature.
4.
Read liquid line temperature on thermometer; then subtract
from saturated condensing temperature. The difference
equals subcooling temperature.
BLINK CODE
One Blink
Two Blinks
Three Blinks
Four Blinks
Five Blinks
Six Blinks
Seven Blinks
From
standard
field-supplied
Table 11 — Fault Codes
SINGLE COMPRESSOR
SIZES 025-071, 180, AND 210
High Pressure
Low Pressure
Source Side Freeze
Not Used on PSW
Brown Out
Load Side Freeze
Not Used on These Sizes
Refrigerant Charging
To prevent personal injury, wear safety glasses and gloves
when handling refrigerant. Do not overcharge system — this
can cause compressor flooding.
NOTE: Do not vent or depressurize unit refrigerant to atmosphere.
Remove and recover refrigerant following accepted practices.
TROUBLESHOOTING
When troubleshooting problems arise with a WSHP, refer to
Table 11 for fault codes. See Table 12 for troubleshooting solu-
tions. The UPM on each unit includes an alarm indicator with
blink codes to indicate UPM fault.
DUAL COMPRESSOR
Freeze (Load or Source)
Not Used on These Sizes
38
WARNING
SIZES 122, 240-420
High Pressure 1
Low Pressure 1
High Pressure 2
Low Pressure 2
Brown Out
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