Troubleshooting Guide - Honeywell T7200D Product Data

T7200D,E, T7300D,E,F AND Q7300 SERIES 2000 PROGRAMMABLE COMMERCIAL THERMOSTATS AND SUBBASES
Fig. 18. Use of external relay and transformer for auxiliary loads greater than 1.6A.

TROUBLESHOOTING GUIDE

Refer to Table 14 for troubleshooting information.
Symptom
Display will not come Thermostat is not being powered. • Check that X terminal is connected to the system
on.
Temperature display is Room temperature display has
incorrect. been reconfigured.
Thermostat is configured for °F or
°C display.
Bad thermostat location.
Display shows two dashes and a
degree sign.
Upper or lower temperature limits
Temperature settings
were reached.
will not change.
(Example: Cannot
set heating higher or
The setpoint temperature range
cooling lower.)
stops were configured.
Keypad is locked. When a locked
key is pressed, LOC flashes on
the LCD.
Unable to configure Installer Setup is locked out.
Installer Setup
L1
(HOT)
Q7300 SUBBASE
A1
A2
A3
AUXILIARY
RELAY
CONTACTS
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 RELAY REQUIRED (R8222 OR SIMILAR).
Table 14. Troubleshooting Information.
Possible Cause
• Check for 24 Vac between X and R or RH terminals.
Enter Installer Setup number 37 and reconfigure the display.
Enter Installer Setup number 14 and reconfigure the display.
Relocate the thermostat.
Installer Setup 22 is set for remote sensing and the sensor is
missing or the circuit is open or shorted.
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)
Check Installer Setup number 34 and 35 and reconfigure the
setpoint stops.
• Reset DIP switch 1 on back of thermostat to enable keypad.
• Enter Installer Setup number 25 or 40 and reconfigure
Reset the DIP switch 1 on back of thermostat to enable
keypad.
L2
1
TO
LOAD
2
M4944
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 power switch on the HVAC 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.
keypad lockout level.
23
Action
(continued)
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