Honeywell T7300D User Manual download pdf (Page 22)

T7200D,E, T7300D,E,F AND Q7300 SERIES 2000 PROGRAMMABLE COMMERCIAL THERMOSTATS AND SUBBASES

63-4355—422

Fig. 19. Use of external relay and transformer for

auxiliary loads greater than 1.6A.

TROUBLESHOOTING GUIDE

Refer to Table 13 for troubleshooting information.

M4944

(HOT)

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD

PROTECTION AS REQUIRED.

RELAY REQUIRED (R8222 OR SIMILAR).

Q7300 SUBBASE

LOAD

AUXILIARY

RELAY

CONTACTS

Table 13. 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 R or RH terminals.

— 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 HVAC equipment power switch on

the 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.

Temperature display is

incorrect.

Room temperature display has been

reconfigured.

Enter Installer Setup number 37 and reconfigure the

display.

Thermostat is configured for °F or °C

display.

Enter Installer Setup number 14 and reconfigure the

display.

Bad thermostat location. Relocate the thermostat.

Display shows two dashes and a degree

sign.

Installer Setup 22 is set for remote sensing and the

sensor is missing or the circuit is 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)

The setpoint temperature range stops

were configured.

Check Installer Setup number 34 and 35 and reconfigure

the setpoint stops.

Keypad is locked. When a locked key is

pressed, LOC flashes on the LCD.

•

Reset DIP switch 1 on back of thermostat to enable

keypad.

•

Enter Installer Setup number 25 or 40 and reconfigure

keypad lockout level.

Unable to configure

Installer Setup

Installer Setup is locked out. Reset the DIP switch 1 on back of thermostat to enable

keypad.

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 35 36

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Honeywell T7300D User Manual Page 22

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