Installation, Operation and Maintenance Manual
Marvel Plus
15
Subject to change without notice.
120.5-IM (1018)
Set Points (continued)
Off Set Point:
As the Return Air Temperature falls below the
cool down Setpt minus the band when morning cool down
mode is enabled, the cool down mode compressors are
deenergized�
Alarm Set Points
The following alarm set point screens are used to monitor
fault points� The high and low settings are used to monitor
and generate a fault when the temperature or pressure rises
above the high or falls below the low settings� During
the fault, the system will continue to operate�
INFORMATION
Please note that the refrigerant pressure transducer is only
used to monitor head pressure� Each refrigerant circuit has
its own high pressure switch that will lock out its particular
compressor if the discharge pressure rises above the
discharge pressure switches fixed trip point.
Alarm delay is the time delay allowed before the system will
show up as a fault� This is used as a means of allowing the
system to recover before a fault is initiated�
U01
Return Temperature
High Alarm >
090.0°F
Low Alarm >
090.0°F
Alarm Delay >
120sec
U01
Static Pressure
High Alarm >
3.20iwc
Low Alarm >
0.00iwc
Alarm Delay >
060sec
U01
Supply Temp
High Alarm >
150.0°F
Low Alarm >
038.0°F
Alarm Delay >
030sec
U01
Refrigerant Press
High Alarm >
600psi
Low Alarm >
08psi
Alarm Delay >
005sec
Run Hours
The following screens show the actual run hours of each
component as tracked by the controller� If any of the screens
listed here do not appear, the system does not have that
particular option�
U01
Run Hours (hrs)
Blower >
01045
Compr 1 >
00121
Compr 2 >
00096
U01
Run Hours (hrs)
Heater 1 >
00247
Heater 2 >
00247
Heater 3 >
00247