29
Safety Features
The Microprocessor Control provides a full array of safety features that will terminate purge
operation when an abnormal condition develops in any one of the following areas:
Maximum Allowable Pumpout Time Exceeded
(PURGE FAULT)
Purge operation is terminated and a latching " Purge Fault" diagnostic occurs when
the pre-set maximum allowable purge pumpout time is exceeded during any 24 -hour
“sliding window” period.
Drain Operation
(DRAIN FAULT)
Purge operation will terminate and a latching "Drain Fault" diagnostic occurs when a
drain malfunction is detected.
Sensor Operation
(SENSOR ERROR)
Purge operation will terminate and a latching "Sensor Error" occurs when a sensor
has failed.
Operating Modes (“
Manual” - “Auto” & “Adaptive”
)
In the "
MANUAL
" mode, purge operation is continuous, whether chiller is on or off. The
“MANUAL" condition is recommended only for service procedures. (see MANUAL keypad switch
for further information page 31)
In the
"AUTO"
mode purge operation interlocks with a chiller-generated "cooling/run" signal which
provides a run signal to the purge unit’s microprocessor control. Operation In the "AUTO” mode is
identical to the “ADAPTIVE” mode except operation occurs only while the chiller is running
(see
AUTO keypad switch for further information on Page 32).
The "
ADAPTIVE
" mode activates the purge’s "self-learning” Duty Cycle function. In this mode the
microprocessor continually monitors and records a history of all non-condensable pumpout activity,
and automatically uses that “recorded” information to "Duty Cycle" (start and stop) future purge
operation based upon its "learned" purging needs. This minimizes both energy usage and wear on
the unit. When in the "Adaptive" mode, the purge system is enabled (enabled does not mean
purging) at all times, and is independent of the operational status of the chiller, and will purge “as
needed” whether chiller is "ON" or “OFF”. (see ADAPTIVE keypad switch for further information
page 32)
The microprocessor’s “self-learning” function utilizes a “daily” average non-condensables Pumpout
Time” (based only on the last 30 day history) to determine the number of “ON” purging cycles
required for any given day. The greater the historical average pumpout time, the greater the
number of “ON” purging cycles per day required, the less the historical average pumpout time, the
less “ON” purging cycles per day required. When the purge is first installed, or anytime after its
data base LOGs have been cleared, purge operation begins with 8 “ON” purging cycles per day
and adjusts according to the pumpout history. Each “ON” purging cycle is for a minimum of 30
minutes. The purge “learns” by the following process. During the last 15 minutes of an “ON”
purging cycle, if any non condensable pumpout activity occurs, the “ON” period is automatically
extended 15 minutes. The “ON” purging Cycle period will continue extending itself until all non-
condensable pumpout activity has ceased. If the “ON” Cycle continues extending indefinitely, there
is probably a problem with either the chiller or the purge system which requires attention.
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