Honeywell T7350 Manual Do Utilizador

Página de 40
T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
23
63-2605—5
TROUBLESHOOTING GUIDE (TABLE 19)
Table 19. Troubleshooting Information.
Symptom
Possible Cause
Action
Display will not come on. Thermostat is not being powered.
Check that X terminal is connected to the system 
transformer.
Check for 24 Vac between X and RH or RC terminals.
If missing 24 Vac:
• Check if circuit breaker is tripped; if so, reset circuit 
breaker.
• Check if system fuse is blown; if so, replace fuse.
• Check if the HVAC equipment power switch is in the Off 
position; if so, set to the On position.
• Check wiring between thermostat and HVAC 
equipment. Replace broken wires and tighten loose 
connections.
If 24 Vac is present, proceed with troubleshooting.
Temperature display is 
incorrect.
Room temperature display has been 
recalibrated.
Use PDA configuration software to recalibrate as desired.
Thermostat is configured for °F or °C 
display.
Press both Run Schedule and Copy, then reconfigure the 
display.
Bad thermostat location.
Relocate the thermostat.
Display shows three dashes and a degree 
sign (all systems shut down).
T7350 is set for remote sensing and sensor is missing or 
circuit is either open or shorted.
Temperature settings will 
not change.
(Example: Cannot set 
heating higher or cooling 
lower.)
Upper or lower temperature limits were 
reached.
Check the temperature setpoints:
• Heating limits are 40° to 90° F (7° to 31° C)
• Cooling limits are 45° to 99° F (9° to 37° C)
Occupied setpoint temperature range 
stops were configured.
Using a PDA, check setpoint stops. If necessary, 
reconfigure the stop(s).
Keypad is locked. When a locked key is 
pressed, LOCKED appears momentarily 
on the LCD.
• Use PDA (Set, Display) to unlock keypad.
• Press both Run Schedule and Copy, then change 
keypad lock level.
Room temperature is out 
of control.
Remote temperature sensing is not 
working.
Check all remote sensors.
Heat will not come on.
No power to the thermostat.
Check that X terminal is connected to the system 
transformer.
Check for 24 Vac between X and RH terminals.
If missing 24 Vac:
• Check if circuit breaker is tripped; if so, reset circuit 
breaker.
• Check if system fuse is blown; if so, replace fuse.
• Check if the HVAC equipment power switch is in the Off 
position; if so, set to the On position.
• Check wiring between thermostat and HVAC 
equipment. Replace broken wires and tighten loose 
connections.
If 24 Vac is present, proceed with troubleshooting.
Thermostat minimum off time is activated. • Wait up to five minutes for the system to respond.
• Use PDA to configure heating response.
System selection is set to Off or Cool.
Set system selection to Heat or Auto.
DAT high limit has been reached, or 
OAT lockout is engaged.
• If the setpoints are correct, do nothing.
• Use PDA (Heating Config) to adjust or disable DAT 
high limit and/or OAT lockout.
• Check HVAC equipment to ensure proper operation.