38 • MultiFlex I/O Board Operator’s Guide
RefrType.
Choose the refrigerant type used in
the refrigeration system in this field.
SpecialCode.
This field is used by ECT person-
nel for service purposes.
Screen 5
Cond and Comp Interlock Enable.
When this
parameter is set to YES, the PAK will cycle OFF
condenser fans when no compressors are ON
and the discharge pressure is below the Interlock
setpoint. When this parameter is set to NO, the
Interlock feature is disabled and condenser fans
will be operated separately from compressor
groups.
Comp Proof Enable.
If you are using compres-
sor proofing, set this field to YES. Compressor
proofs for the PAK are not separate inputs; they
are resistive loads applied in parallel with the
Discharge Temp sensors for each compressor
group. The PAK interprets changes in the input’s
resistance as proof contact closures or openings.
8.4.1.2.
2 - Comp SP
Screen 1
SuctPresSP.
The Suction Pressure Setpoint is
the suction pressure the PAK will attempt to
maintain during compressor pack control (disre-
garding suction setpoint floating).
OutDB.
The Outer Deadband is the range of
pressure values, equally above and below the
Suction Pressure Setpoint but wider than the
Suction Deadband (or DB), within which the
PAK will cancel a compressor group stage
change if the suction pressure is detected as
returning to within the Suction Deadband. See
tion of this feature.
DB.
The Deadband is the range of pressure val-
ues equally above and below the Suction Pres-
sure Setpoint within which the suction pressure
is considered to be acceptable. While the suction
pressure input value is within this deadband
value, no compressor groups will be activated or
deactivated.
Step ON Delay and Step OFF Delay.
The Step
ON Delay is the amount of time the PAK will
wait after the last compressor group activation
before bringing on the next compressor group or
advancing to the next fixed step.
The Step OFF Delay is the amount of time
after the last compressor group deactivation
before deactivating the next compressor group
or moving down one fixed step.
Screen 2
Suct Pressure Min SP.
The Suction Pressure
Minimum Setpoint is the lowest allowable suc-
tion pressure for the refrigeration system. If the
suction pressure falls below this setpoint, all
compressors will be turned OFF and will remain
off until the suction pressure rises above the Suc-
tion Pressure setpoint.
Prf Restart Dly and Proof RestartPH.
When a
compressor proof registers a failure, the Proof
Restart Delay is the amount of time the PAK will
wait in between attempts to reset the compressor
proof failure by activating the compressor. The
PAK will try to reset a compressor for a maxi-
mum number of times per hour, specified in the
Proof Restart PH field. After the maximum num-
ber of retries, if the compressor is still failed, the
PAK will not try any further resets until the start
of the next hour.
Cond and Comp
InterlockEn: YES
CompProofEn: YES
(4750 Ohms)
SuctPresSP: 45.0
OutDB: 8 DB: 4
StepON Dly: 30 S
OFF Dly: 20 S
Suct Pressure
Min SP: 0.0
Proof ReStarts
PH: 6 Dly: 240 S
Summary of Contents for MultiFlex PAK
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