Shutdown Alarms - valent VPR Series Controls Instruction Operation & Maintenance

Space Humidity Sensor
SPACE HUMIDITY, Space Humidity Sensor
If a space humidity sensor is installed, this alarm
is displayed if the value being read from the
sensor is less than 5%.
Space Temp Sensor
SPACE TEMP, Space Temperature Sensor
If a space temperature sensor is installed, this
alarm is displayed if the value being read from it
is greater than 300°F or less than 0°F over a 2
minute time period.
WSHP Ambient Lockout
WSHP AMBIENT LOCKOUT, WSHP Ambient Lockout
If the unit is a water source heat pump, this alarm indicates
that the ambient temperature was below -5°F when the unit
attempted to start, thus locking out the compressors. The
compressors will remain locked out unless the ambient
temperature rises above 0°F after one hour.
WSHP Ref Low PSI
WSHP REF LOW PSI, WSHP Low Refrigerant Pressure
If the unit is a water-source heat pump, then this alarm
indicates that the suction temperature of the refrigeration
system is below the WSHP Suction Temp Low Limit Safety
(25°F default). The digital scroll compressor will be limited
in its output until the suction pressure increases again.

Shutdown Alarms

Shutdown alarms are critical alarms that shut
down the system and must be reset manually
after the condition has been corrected. Refer to
the following section on Resetting Shutdown
Alarms.
Damper End Switch
DAMPER SWITCH, Outdoor Air Damper End Switch
If there is a call from the controller for the unit to
open the dampers and the Damper End Switch
is not made within 1 minute, the unit will go into
shutdown mode and display this alarm.
Duct High Static
DUCT STATIC, Duct Static Pressure
If the duct static pressure is greater than the
user-adjustable value (0-5 InWc; default of 2.5
InWc), the unit will go into shutdown mode and
display this alarm.
Valent Controls IOM
Freezestat
FREEZESTAT, Freezestat
If the Freezestat of either the hot water coil or
the chilled water coil trips (open connection on
U7 of the DDC3), the unit will go into shutdown
mode, open one or both water valves to full flow,
and display this alarm.
HPC_LPC_A Alarm
HPC_LPC_A,
High Pressure/Low Pressure Cutout Circuit A
If the unit senses an open contact on either the
high pressure or low pressure switch on
compressor circuit A, this alarm is displayed.
This is a shutdown alarm if the point Shutdown
Unit During High/Low Pressure Trip is set to
Yes.
HPC_LPC_B
HPC_LPC_B,
High Pressure/Low Pressure Cutout Circuit B
If the unit senses an open contact on either the
high pressure or low pressure switch on
compressor circuit B, this alarm is displayed.
This is a shutdown alarm if the point Shutdown
Unit During High/Low Pressure Trip is set to
Yes.
Shutdown Input
SHUTDOWN INPUT, Shutdown Input
If the Shutdown Input (Universal Input 16; U16)
is opened (connection to 0V broken) the unit will
go into shutdown mode and display this alarm.
Space High Static
SPACE STATIC, Space Static Pressure
If the space static pressure is greater than the
user adjustable value (0-0.5 InWc; default of 0.2
InWc) for 15 seconds, the unit will go into
shutdown mode and display this alarm.
Supply Fan Fail
SUPPLY FAN, Supply Fan
If the supply fan output from the controller does
not match the supply fan status (actual supply
fan output) within a 1 minute time period, the
unit will go into shutdown mode and display this
alarm.
Supply Temp High Limit
HIGH SUP TEMP, Supply Temp High
If the supply temperature is greater than 120°F
for 3 minutes, the unit will go into shutdown
mode and display this alarm.
55 IOM-C1-0616
Part Number 474626