Viconics VT7607 BACnet Integration Guide (First Release 100 Manual de usuario descargar pdf (Pagina 22)

Symptom Possible Cause Corrective Action

Wrong mode selected Select cooling mode

Thermostat in Unoccupied

mode

Select Occupied Hold in Schedule hold or Override to

force the thermostat 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

Thermostat will not call

for cooling

Wiring error 1. Start the Fan by forcing the Fan ON mode

2. Put a jumper across terminals RC & Y1. The

cooling should come ON. If it does not, verify wiring

Wrong mode selected The thermostat will not

turn on the fan

Wiring error

1. Start the Fan by forcing the Fan ON mode

2. Put a jumper across terminals RC & G. The fan

should come ON. If it does not, verify wiring

Digital display shows

missing digits or erratic

segments

Defective display Replace thermostat

RH sensor is out of range Verify the remote RH sensor or the internal RH

sensor

System Mode in Cool or Off Change the system mode parameter to heat

System Mode in Auto but a

cooling demand at the

thermostat

Wait: when a heating demand will occur at the

thermostat, humidification will resume

Thermostat will not call

for humidification

High limit sensor is controlling

the humidifier output by

forcing it to 0%

Wait: when the supply humidity will drop below the

high limit setpoint, humidification will resume.

RH sensor is out of range Verify the remote RH sensor or the internal RH

sensor

System Mode in Heat or Off Change the system mode parameter to cool

System Mode in Auto but a

heating demand at the

thermostat

Wait: when a cooling demand will occur at the

thermostat, dehumidification will resume

Thermostat will not call

for dehumidification

Outside air temperature is

below the Dhu OALK

parameter

Change the Dhu OALK parameter to a value that will

enable the dehumidification, if desired.

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