44
“MISCELLANEOUS” - Informational Displays
Pump-out Display
When the purge unit is exhausting non -condensables the display will alternate between the
current operating mode and the pumpout display.
Displayed:
Pump out Active
Example:
Duration: 00:00
(minutes & seconds)
DRAIN BACK EQUALIZATION CYCLE
Under certain conditions (such as when the purge is operating while the chiller is OFF),
pressure gradient imbalances may developed which can retard liqu id drainage from the purge
tank. The purpose of a
“DRAIN BACK EQUALIZATION CYCLE”,
is to periodically cycle the
purge condensing unit “off” so that pressures can equalize between the chiller and the purge,
and thus allow the purge tank to drain. This is a normal operating sequence.
If after two minutes liquid level switch LS1 senses that the condensed refrigerant within the
purge tank is not draining properly a Drain Back Equalization Cycle is initiated.
Maximum duration of the
DRAIN BACK EQUALIZATION CYCLE
is
10 minutes. If however, at
the end of 10 minutes liquid level Switch (LS1) has not sensed proper drainage, the purge will
shut down on
Drain Fault
.
When the purge unit is in a drain cycle the LCD display will alternate between the current
operating mode and one of the following drain displays:
Draining liquid
Liq. level HIGH
This indicates the liquid level in the purge tank is above the “Make” point of liquid level switch
LS1. Drain solenoid valve L3 should be energized. As soon as the liqui d level drops below the
“Break” point of liquid level switch LS1 a “Drain Cycle” time delay is initiated which keeps the
drain solenoid valve L3 energized for up to twenty seconds (depending on pre -set time, see
“Drain Cycle” time page 27).
Displayed:
Draining Liquid
Delay....
Содержание Redi-Purge PRG-113-C3
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