Viconics VT7600 Installation Guide (First Release 1000 Series) - Manual (Page 23)

23
Troubleshooting guide
Heatpump models
Wrong mode selected Select emergency heat mode
Thermostat in Unoccupied
mode Select Occupied Hold in Schedule hold or Override to
force the thermostat Occupied heating setpoint
Anticycle delay active Wait, the anticycling period will end and the
equipment will start
Heating setpoint is satisfied Raise the Heating setpoint
High Balance point attained 1. Mode is locked out based on outside air
temperature
2. Change configuration parameter High BP to value
90 °F ( 32 °C ) to by-pass lockout
Heating lockout attained 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
Auxiliary heat does not
operate
Wiring error 1. Start the Fan by forcing the Fan ON mode
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
Heat pump does not
operate in heating
mode Wrong mode selected Select heating mode
Thermostat in Unoccupied
mode Select Occupied Hold in Schedule hold or Override to
force the thermostat Occupied heating setpoint
Anticycle delay active Wait, the anticycling period will end and the
equipment will start
Heating setpoint is satisfied Raise the Heating setpoint
Low Balance point attained 1. Mode is locked out based on outside air
temperature
2. Change configuration parameter Low BP to value -
12 °F ( -24 °C ) to by-pass lockout
Heating lockout attained 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
Wiring error 1. Start the Fan by forcing the Fan ON mode
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
Wrong reversing valve
configuration 1. Wrong selection of parameter Re Valve
2. Select O will energize the valve in cooling
operation. Valve is normally heat.
3. Select B will energize the valve in heating
operation. Valve is normally cool.