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Pumpout Time with chiller On or Off (over the
last 24 hours or daily average over the last 7
days, whichever is greater)
Pumpout Time ≤ 1 minute
1 minute < Pumpout Time ≤ 3 minutes
3 minutes < Pumpout Time ≤ 5 minutes
Pumpout Time > 5 minutes
During the purge refrigeration circuit Off cycle, the time
remaining is displayed as the Time Until Next Purge Run in
the purge report of the Tracer
If the controls determine it is necessary to run the purge
while the chiller compressor is Off, the purge will be started
and run until 60 consecutive minutes have passed without
any pump-out of non-condensables.
If the chiller compressor starts before the purge Off cycle
has elapsed, the purge starts and transfers to Adaptive
Mode Procedure – Chiller Compressor On.
Process—Chiller Compressor On," p. 94
illustration of this process.
Submodes
You can view submodes from the Purge Settings screen.
The available purge submodes are:
•
Refrigeration Circuit On. Appears if the purge
condensing unit/compressor is operating.
•
Refrigeration Circuit Idle. Appears if the purge
condensing unit/compressor is not operating.
•
Pumping Out. Appears if the purge refrigeration circuit
is On and pump-out has been initiated by the purge unit
controls.
•
Exhaust Circuit Check. Appears if a pump-out has
been initiated by an operator.
•
Pumpout Inhibited. Appears if the purge refrigeration
circuit is On but pump-out has been inhibited by a low
condenser saturation temperature.
CDHH-SVX003C-EN
Purge Off cycle
duration
3 days
2 days
1 day
6 hours
®
AdaptiView™ display.
"Adaptive Mode
includes an
•
Daily Pumpout Limit Disabled. Appears if the purge
refrigeration circuit is On but the daily pump-out limit
has been disabled.
•
Regenerating. Appears if the purge carbon system is
in its regeneration mode. Pump-out is not allowed in
this submode.
•
Alarm–Check Diagnostics. Appears if a new
diagnostic occurs.
•
Purge Diag Shutdown. Appears if the purge system
has shutdown in response to a latching diagnostic.
•
Regen Disabled. Appears if carbon regeneration is not
allowed.
Typical Purge Refrigeration Circuit Operating
Cycle
The purge condensing-unit compressor suction
temperature varies with the amount of non-condensables
collected in the purge tank. If the amount of non-
condensables collected in the purge tank limits the
available condensing surface in the tank, the condensing-
unit compressor suction temperature begins to fall.
The purge controller initiates a pump-out cycle when the
suction temperature reaches the pump-out initiate value
that is calculated within the purge control. During the pump-
out cycle, the small pump-out compressor pulls any non-
condensables from the purge tank and discharges them
through the carbon tank. As the non-condensables are
removed from the purge tank, the condensing-unit
compressor suction temperature increases. The purge
controller monitors the compressor suction temperature
and cycles or stops the pump-out, depending on the
temperature that is present.
The 1/4 hp air-cooled condensing unit of the refrigeration
system operates effectively when it is in the operating
range shown in the following figure.
Start-up and Shutdown
97
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