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Ready to Pumpout
In running status, the purge refrigerant system is running
and the pumpout is disabled. The purge outputs shall have
the following status:
Purge refrigerant compressor relay on
Purge pumpout relay on
Tank valve relay off
Alarm relay off
During running status, the purge refrigerant compressor
suction temperature is monitored. When this temperature
falls below the calculated temperature to initiate pump out,
the pumpout status is entered. When this temperature then
rises above the calculated pumpout termination
temperature, the pumpout status is terminated. If the
service pumpout switch is in the on position, the service
pumpout status is entered. The pumpout compressor relay
needs to be activated for a minimum of 30 seconds before
the purge will allow transitioning to the Pumpout or Service
Pumpout status.
Pumping Out of Condenser
Pumpout is initiated by opening the tank valve. When the
purge refrigerant compressor suction temperature drops
below the calculated pumpout initiate temperature, the
outputs shall have the following status:
Purge refrigerant compressor relay on
Purge pumpout compressor relay on
Tank valve relay on
Alarm relay off
The system remains in this mode until the purge refrigerant
compressor suction temperature rises above the calculated
pumpout termination temperature, indicating a sufficient
amount of air has been removed. At this point the system
returns to the “Ready to Pumpout”.
Pumping out absorber
Pumpout is initiated opening the solenoid valve located on
the absorber belly. The outputs will have the following
status.
Purge refrigerant compressor relay on
Purge pumpout compressore relay off
Tank valve relay off
Absorber valve relay on
Alarm relay off
The system will remain in this mode until the druationtime
expires.
Service Pumpout
The service pumpout status is intended to aid the
serviceman in accomplishing certain mechanical repairs.
Service Pumpout mode initiates the pumpout sequence
regardless of the chiller running state OR the refrigerant
suction temperature. The outputs should have the
following states:
Diagnostic Alarm
This status is active whenever the purge has an active
latching diagnostic. Pumpout is inhibited unless the purge
is in the Service Pumpout mode.
The outputs should have the following states unless in
Service Pumpout mode:
Purge refrigerant compressor relay off
Purge pumpout compressor relay off
Exhaust valve relay off
Tank valve relay off
Alarm relay on
Standby
In idle status, the purge is on, the purge refrigerant system
is not running, and the pumpout is disabled. The purge
outputs shall have the following status:
Purge refrigerant compressor relay off
Purge vacuum pumprelay on
Tank valve relay off
Alarm relay off
If the service pumpout switch is in the on position, the
service pumpout state is entered.
Timers
Pumpout Rate Timer
The purpose of the pumpout rate timer is to have a current
indication of the pumpout activity for the previous 24
hours. The pumpout rate timer will be the summation the
last 24 hours. The pumpout rate timer has 0.1-minute
resolution with a range of 0 to 250 minutes.
The primary purposes of the pumpout rate timer are to
provide real time display of current pumpout activity and to
provide diagnostic capability. The accumulated time is
compared against the maximum pumpout rate setpoint to
determine if a diagnostic should be generated. If a
diagnostic is generated, clearing the diagnostic will reset
this timer to zero.
Total Pumpout Time
The timer increments when the Tank Valve is opened.
Purge Run Time
The Run Time when the compressor (Copland) unit is
commanded on.
Service Log
The service log tracks two items of data:
1. Total purge pumpout time since last reset.
2. Elapsed calendar days since last reset.
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