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Recommended Maintenance
Table 27. R-1233zd refrigerant moisture content as
determined by moisture indicator
75°F
Refrigerant moisture
(23.9°C)
level
Dry
Below 20
Caution
20–50
Wet
Above 50
Note: Refrigerant moisture content given in parts per million (ppm).
Maintaining the Moisture-Indicating Sight
Glass
In normal operating conditions, the moisture-indicating
sight glass should not require maintenance beyond
keeping the sight glass clean. However, the sight glass
should be replaced after any major repair to the unit has
taken place, or if it is on a unit in which severe moisture
contamination is known to have occurred.
Be aware that it is normal for the sight glass to indicate the
presence of moisture for a period of least 72 hours after it is
installed and after it has been exposed to atmosphere.
Allow a minimum of 72 hours after sight glass installation or
filter-drier service before using the sight glass to determine
the system moisture content.
Removing Air After Servicing the Chiller
Air that leaks into a chiller during servicing needs to be
removed so that the chiller can operate normally. The
110
100°F
125°F
(37.8°C)
(51.7°C)
Below 30
Below 35
30–80
35–100
Above 80
Above 100
purge pump-out system, which performs this function, may
operate for a long time to remove the air before cycling off
for the first time. This is due to the large amount of non-
condensables and the relatively small amount of refrigerant
being drawn into the purge tank.
Important: Do NOT bypass or remove the pump-out
restrictor of the EarthWise™ purge system.
Doing so could reduce the efficiency of the
purge system. The purge system has a faster
air exhaust rate than previous purge systems,
which makes bypassing or removing the
restrictor unnecessary.
The Daily Pumpout Limit determines how long the purge
pump-out compressor can operate continuously without
generating a Purge Daily Pumpout Exceeded diagnostic,
which will shut off the purge system. You can disable the
Daily Pumpout Limit to allow the purge to pump out for an
extended period of time.
After the level of non-condensables present in the chiller
falls to a point in which an increasing amount of refrigerant
enters the purge tank, the pump-out compressor begins to
cycle on and off. As the refrigerant in the system becomes
less contaminated with non-condensables, purge pump-out
is activated less frequently.
Note: If large amounts of non-condensables are present in
the chiller, the air removal rate can be enhanced by
operating the chiller at part-load conditions.
CDHH-SVX003C-EN
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