McQuay TSC User Manual

42 OM Centrif Micro ΙΙ-5
Problem Alarms
The following alarms do not cause compressor shutdown but limit operation of the chiller in some way as
described in the Action Taken column. A limit alarm will trigger the red alarm screen but not the digital
output for the optional remote alarm.
Table 21, Problem Alarm Description
Description Display Occurs When: Action Taken Reset
Low Evaporator Pressure
– Inhibit Loading
Lo Evap Press-
NoLoad
Pressure < Low Evap
Pressure–Inhibit setpoint
Inhibit loading
Evap Press rises
above (SP + 3psi)
Low Evaporator Pressure
– Unload
Low Evap
Press-Unload
Pressure < Low Evap
Pressure–Unload setpoint
Unload
Evap Press rises
above (SP + 3psi)
Evaporator Freeze
Protect
Evap Pres Lo-
Freeze
Evap Sat Refr Temp <
Evaporator Freeze SP
Start
evaporator
pump
Temp > (Evaporator
Freeze SP + 2°F)
Condenser Freeze
Protect
Cond Pres Lo-
Freeze
Cond Sat Refr Temp <
Condenser Freeze SP
Start condenser
pump
Temp > (Condenser
Freeze SP + 2°F)
High Discharge
Temperature
High Discharge
T-Load
Temperature > High Discharge
Temperature-Load SP AND
Suction superheat < 15°F
Load
Temp < (High Dsch
Temp Load SP – 3°F)
OR Superheat > 18°F
Warning Alarms
A warning is annunciated whenever an abnormal condition exists which does not affect chiller operation
and does not trigger the remote alarm.
Table 22, Warning Alarm Description
WARNING DISPLAY CONDITION
Liquid Line Refrigerant
Temperature Sensor Fall Warning
Liq Line T Sen Warn Sensor is shorted or open
Entering Evaporator Water
Temperature Sensor Fall Warning
Ent Evap T Sen Warn Sensor is shorted or open
Leaving Condenser Water
Temperature Sensor Fail Warning
Lvg Cond T Sen Sensor is shorted or open
Entering Condenser Water
Temperature Sensor Fail Warning
Ent Cond T Sen Sensor is shorted or open
Figure 26, Keyboard
The keyboard is for
entering the password
when attempting to
enter or change a
setpoint. This screen
is accessed from the
SERVICE screen by
pressing the
PASSWORD button.
It is automatically
accessed when making
a change to a setpoint
on any SET screen.

McQuay TSC Specifications

General

Brand	McQuay
Model	TSC
Category	Controller
Language	English