Viconics VT76 7 Series Installation Manual page 13

Room Controller
will not call for
heating
Room Controller
will not call for
cooling
The Room
Controller will not
turn on the fan
Digital display
shows missing
digits or erratic
segments
13 | 028-0229-05
Wrong mode selected
Room Controller in
Unoccupied mode
Anti-cycle delay active
Heating setpoint is
satisfied
Heating lockout
attained
Wiring error
Wrong mode selected
Room Controller in
Unoccupied mode
Anti-cycle delay active
Cooling setpoint is
satisfied
Cooling lockout
attained
Wiring error
Wrong mode selected
Wiring error
Defective display
Select heating mode
Select Occupied Hold in Schedule hold
or Override to force the Room Controller
Occupied heating setpoint
Wait, the anti-cycling period will end and
the equipment will start
Raise the Heating setpoint
1. Mode is locked out based on outside
air temperature
2. Change configuration parameter H
Lock to value 120 °F ( 49 °C ) to by-
pass lockout
1. Start the Fan by forcing the Fan ON
2. Put a jumper across terminals RH &
W1. The heating should come ON. If it
does not, verify wiring and check if a
jumper is required between RC & RH
Select cooling mode
Select Occupied Hold in Schedule hold
or Override to force the Room Controller
Occupied cooling setpoint
Wait, the anti-cycling period will end and
the equipment will start
Lower the cooling setpoint
1. Mode is locked out based on outside
air temperature
2. Change configuration parameter C
Lock to value -40 °F ( -40 °C ) to by-
pass lockout
1. Start the Fan by forcing the Fan ON
2. Put a jumper across terminals RC &
Y1. The cooling should come ON. If it
does not, verify wiring
1. Start the Fan by forcing the Fan ON
2. Put a jumper across terminals RC &
G. The fan should come ON. If it does
not, verify wiring
Replace Room Controller
mode
mode
mode
November 2015