McQuay TGZ 040A User Manual

66 TGZ 040A through TGZ 190A OMM TGZ-1
The last action to take place is the shutoff of all compressors running when the
LowEvPrStop setting is reached (default is 58 psi). Reducing these time intervals will
increase detrimental compressor cycling. It is recommended that these settings not be
changed.
SET ALARM LMTS (2)
High Cond Pressure
Unload= XX.X°
°°
°F
Stop=XXXsec
Unload is a limit alarm that unloads the unit at 370 psi in an attempt to prevent total
shutdown from the HighCondPr at 380 psi. The stage down is set at 370 psi. It is
recommended that these settings not be changed.
Stop (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.
LowEvPrDelay is a time delay on the low pressure trip that reduces nuisance low-pressure
trips. The default setting is 30 seconds.
SET ALARM LMTS (3)
GroundFault = N
PhaseVoltage = N
Low OATStartTMR=XXsec
GroundFault and PhaseVoltage entries are Y (Yes) or N (No) depending on whether the
options are on the unit.
CondFreeze is an alarm that reduces the chance of freezing the water in the condenser
(when compressors are not running). An alarm is registered and the condenser pump is
energized at the same time. The alarm setpoint is 34F saturated condenser temperature
and it resets at +2F above the setpoint.
SET ALARM LMTS (4)
Evap Freeze = XX.X°
°°
°F
EvapFlowProff=XXXsec
Recirc Timeout=XXmin
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 therefore proving
the existence of chilled water flow resets this trip. It is recommended that these settings not
be changed.
LowAmbientLock applies to units with air-cooled condensers and prevents unit operation
below the setting. The available range is -2F to 60F with a default of 35F.
WaterCooled=ON
SET ALARM LIMITS (5)
Cond Freeze= XX.X °F
CondFlowProof= XX sec

McQuay TGZ 040A Specifications

General

Brand	McQuay
Model	TGZ 040A
Category	Water Heater
Language	English