Viconics VT7607 BACnet Integration Guide (First Release 100 Manuel d'utilisateur télécharger pdf (Page 21)

Troubleshooting guide

Symptom Possible Cause Corrective Action

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

No display on the

thermostat

Overloaded power

transformer

Verify that the transformer used is powerful enough

(enough VA’s) to supply all controlled devices

including the thermostat

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 thermostat 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

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

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

Thermostat will not call

for heating

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

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Viconics VT7607 BACnet Integration Guide (First Release 100 Manuel d'utilisateur Page 21

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