Viconics VT7600W Installation Manual - Manual (Page 32)

32 | PIR Ready VT76xxW Series-Installation Guide
T
ROUBLESHOOTING GUIDE
All models
Symptom Possible Cause Corrective Action
No display on the
Terminal
Equipment
Controller
Absent or incorrect
supply voltage
1. Check power supply voltage between C
& RC to be from 19-30 VAC
2. Check for tripped fuse or circuit breaker
Overloaded power
transformer
Verify that the transformer used is
powerful enough (enough VA’s) to supply
all controlled devices including the
Terminal Equipment Controller
Keyboard menu
does not access
all functions
Keyboard locked
Change configuration parameter
LOCKOUT to value “0” to access all levels
of the menu
Temperature
setpoints revert to
original value
after a certain
time period
Temporary setpoint
option selected
1. The Terminal Equipment Controller
needs to be in Permanent setpoint
mode for the new setpoint to be kept
and memory and used all the time
2. Go to the Set temperature menu.
3. The last prompt is setpoint type. Set it
to Permanent setpoint
Terminal
Equipment
Controller will not
call for heating
Wrong mode selected Select heating mode
Terminal Equipment
Controller in
Unoccupied mode
Select Occupied Hold in Schedule hold or
Override to force the Terminal Equipment
Controller 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
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
Terminal
Equipment
Controller will not
call for cooling
Wrong mode selected Select cooling mode
Terminal Equipment
Controller in
Unoccupied mode
Select Occupied Hold in Schedule hold or
Override to force the Terminal Equipment
Controller Occupied cooling setpoint
Anticycle delay active
Wait, the anticycling period will end and
the equipment will start
Cooling setpoint is
satisfied
Lower the cooling setpoint
Cooling lockout
attained
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