Unit installation

46 ACZ 010A through 039A IOMM ACZ1-2
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 COMP SPs (3)
Manual Comp Enable
Comp 1= Enable
Comp 2= Enable
SET ALARM SETPOINTS
SET ALARM LMTS (1)
Low Evap Pressure
Hold = 59.0 psi
Unload = 58.0 psi
If two compressors are running, the LowEvPr Unld is in effect and the lag compressor will
be shut off to unload the unit. If one compressor is running, the LowEvPr Hold is in effect
and the lag compressor is prevented from starting, thereby holding the unit capacity.
SET ALARM LMTS (2)
EvapFlowProof=XXXsec
EvapFlowProof is the flow switch interlock. Closing the flow switch and therefore proving
the existence of chilled water or air flow resets this trip.
SET ALARM LMTS (3)
HighCondPr = XXXpsi
HiCondStgDn = XXXpsi
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 380 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.
SET ALARM LMTS (4)
PhaseVoltage=YES/NO
LowOATStrtTmr=XXXsec
LowAmbientLock prevents unit operation below the setting. If the unit is equipped with
the standard FanTrol pressure-activated control, the available range is 35°F to 60°F with a
default of 35°F. With the optional SpeedTrol variable speed control, the range becomes –
2°F to 60°F with default of 0°F. Input to line 3 of the next screen, SET FANS SP (1),
informs the controller which type of control is installed and which range of setting to allow.