Honeywell T7200D Product Data page 24

T7200D,E, T7300D,E,F AND Q7300 SERIES 2000 PROGRAMMABLE COMMERCIAL THERMOSTATS AND SUBBASES
Symptom
Temperature settings Trying to set heating and cooling
change from original setpoints too close together.
setting. There is a deadband in automatic
changeover thermostat models.
Example: cool setpoint=72,
deadband=3, heat setpoint=68,
changing heat setpoint to 70 will
automatically change the cool
setpoint to 73.
Room temperature is Remote temperature sensing is
out of control. not working.
Heating will not come No power to the thermostat.
on.
Heating will not come Thermostat minimum off time is
on (Continued). activated and wait indicator is
displayed.
System selection is not set to
Heat.
Cooling will not come No power to the thermostat.
on.
Thermostat minimum off time is
activated and wait indicator is
displayed.
System selection is not set to
Cool.
Conventional heating equipment
System on
turns on the fan when the furnace
indicator (flame=heat,
has warmed up to a setpoint.
snowflake=cool) is
displayed, but no warm
Heating or cooling equipment is
or cool air is coming
not operating.
from the registers.
63-4355—2
Table 14. Troubleshooting Information (Continued).
Possible Cause
• Check that the heating setpoint is lower than the cooling
• Check Installer Setup number 30 to identify the deadband
Checkout all remote sensors.
• Check that X terminal is connected to the system
• Check for 24 Vac between X and R or RH terminals.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 38. Reconfigure minimum off
Set system selection to Heat.
• Check that X terminal is connected to the system
• Check for 24 Vac between X and R or RC and Y terminals.
• Wait up to five minutes for the system to respond.
• Enter Installer Setup number 33. Reconfigure minimum off-
Set system selection to Cool.
Wait one minute after seeing the on indicator and then check
the registers.
Verify operation of heating or cooling equipment in self-test.
setpoint.
between heating and cooling setpoints. Reconfigure if
desired.
transformer.
— If missing 24 Vac:
— check if the circuit breaker is tripped; if so, reset the
circuit breaker.
— check if the system fuse is blown; if so, replace the
fuse.
— check if the system switch at the equipment is in the
Off position; if so, set to On position.
— check wiring between thermostat and HVAC
equipment and replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
time (if required).
transformer
— If missing 24 Vac:
— check if the circuit breaker is tripped; if so, reset the
circuit breaker.
— check if the system fuse is blown; if so, replace the
fuse.
— check if the system switch at the equipment is in the
Off position; if so, set to the On position.
— check wiring between thermostat and HVAC
equipment and replace any broken wires and tighten
any loose connections.
— If 24 Vac is present, proceed with troubleshooting.
time (if required).
24
Action