IOMM AGZB1 AGZ 010B through 034B 59
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.
The last action to take place is the shutoff of all compressors running when the
LowEvPrStop setting is reached (default is 58 psi).
SET ALARM LMTS (2)
Evap Freeze= XX.X°
°°
°F
EvapFlowProof=XXXsec
Evap Freeze (the unit freeze protection shutdown) is actually a stop alarm and shuts off the
unit when the LWT reaches 36°F. It is cleared by going to the CLEAR ALARM menu in
the ACTIVE ALARM hierarchy.
EvapFlowProof is the flow switch interlock. Closing the flow switch and therefor proving
the existence of chilled water flow resets this trip.
SET ALARM LMTS (3)
High Cond Pressure
Unload = XXXpsi
Stop = 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
Stop is a shutdown alarm that stops the unit when the discharge pressure reaches the
setpoint.
SET ALARM LMTS (4)
PhaseVoltage=YES/NO
LowOATLockTmr=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.
SET FANS STAGES
SET FANS SPs (1)
Fan Stages= X
Speedtrol = NO
The Fans line tells the controller the number of fans on the unit. The UP ARROW toggles
between 1, 2, and 3. 1 is not used; 2 should be used for Models AGZ 010, 013, and 017;
and 3 should be used for AGZ 020, 025, 029, and 034.
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