
11 | PIR Ready VT76x7 Series-Installation Guide
Sequence of auto-scroll status display:
Outdoor air temperature
Outdoor air temperature display is only enabled when outdoor air temperature sensor
is connected.
A maximum range status display of 50 °C ( 122 °F ) indicates a shorted sensor.
Associated functions, such as mode lockouts and economizer function are
automatically disabled.
A minimum range status -40 °C ( -40 °F ) is not displayed and indicates a opened
sensor or a sensor not connected. Associated functions, such as mode lockouts are
automatically disabled.
Alarms
If alarms are detected, they will automatically be displayed at the end of the status
display scroll.
During an alarm message display, the back lit screen will light up at the same time as
the message and shut off during the rest of the status display.
Two alarms maximum can appear at any given time.
The priority for the alarms is as follows:
Indicates that the heating is energized by the low limit frost protection room
temperature setpoint 5.6 °C ( 42 °F )
Indicates that the clock needs to be reset. There has been a power failure
which has lasted longer than 6 hours
Indicates that there is a service alarm as per one of the configurable digital
input ( DI1 or DI2 )
Indicates that the filters are dirty as per one of the configurable digital input (
DI1 or DI2 )
Indicates that the heating and cooling action are locked out due to a defective
fan operation
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