Unit installation

IOMM ACZ/AGZ-3 ACZ / AGZ-BM 121
SET COMP SPs (2)
InterStgUp= XXXsec
InterStgDn= XXXsec
Clear Cycle Tmrs=no
InterStageUp is the time delay since the last stage change before a compressor can stage on.
InterStageDn is the time delay since the last stage change before a compressor can stage off
normally (not by an alarm).
Set Alarm Screens
SET ALARM LIMITS (1)
LowEvPrHold=XXXpsi
LowEvPrUnld=XXXpsi
The LowEvPrHold and LowEvPrUnld have the same default value of 59 psi. If two compressors are
running, the LowEvPrUnld is in effect and the lag compressor will be shut off to unload the unit. If
one compressor is running, the LowEvPrHold is in effect and the lag compressor is prevented from
starting, thereby holding the unit capacity.
SET ALARM LIMITS (2)
HiCondPr = XXX.Xpsi
HiPrStgDn= XXX.Xpsi
EvapFlowProof=XXXsec
HighCondPr (the unit high-discharge-pressure shutdown) is a stop alarm that shuts off the unit when
the discharge pressure reaches the setting. The default setting is 385 psi. The HiCondStDn is a limit
alarm that unloads the unit in an attempt to prevent total shutdown from the HighCondPr. The stage
down is set at 370 psi.
EvapFlowProof setting is only required when a proof of flow signal is wired to the controller. See
EvapFan discussion on page 115.
SET ALARM LIMITS (3)
PhaseVoltage = N
Ground Fault = N
SET Fan Setpoints
SET FANS SPs (1)
Number of fans=X
Fan VFD=no
SET FANS SPs (2)
Stg Up Deadband(°
°°
°F)
Stg2 Stg3 Stg4
XX.X XX.X XX.X
SET FANS SPs (3)
Stg Dn Deadband(°
°°
°F)
Stg0 Stg1 Stg2 Stg3
XX.X XX.X XX.X XX.X