Honeywell T7350 Installation Instructions

T7350 COMMERCIAL PROGRAMMABLE THERMOSTAT
9 62-0195—04
WIRING DIAGRAMS (FIG. 7 - 14)
Fig. 7. Typical hookup of T7350A in two-stage heat and one-stage cool conventional system
with two transformers.
Cooling 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 cooling response.
System selection is set to Off or
Heat.
Set system selection to Cool or Auto.
System indicator
(flame: heat,
snowflake: cool)
is displayed, but
no warm or cool
air is coming from
the registers.
The call for heat or cool is not yet
given.
Check if any stage indicators (dots next to the system indicator)
are displayed. With no display of stage indicators, no call for
cool/heat is yet given.
For T7350M models only: Check the information screens. A
MODHEAT or MODCOOL percentage of zero indicates a signal
of 4 mA from the given terminal.
Conventional heating equipment
turns the fan on only after the
furnace has warmed to a setpoint.
Wait one minute after seeing the on indicator and then check the
registers.
Heating or cooling equipment is
not operating.
Verify operation of heating or cooling equipment in self-test.
Table 4. Troubleshooting Information. (Continued)
Symptom Possible Cause Action
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
WHEN INSTALLED ON A SYSTEM WITH TWO TRANSFORMERS, REMOVE THE FACTORY-INSTALLED JUMPER.
1
M19764A
2
2
RCX
SUBBASE
W1 GY1AUXRH
1
L1
(HOT)
L2
1
L1
(HOT)
L2
COMPRESSOR
CONTACTOR 1
HEATING
TRANSFORMER
COOLING
TRANSFORMER
FAN
RELAY
HEAT
RELAY 2
HEAT
RELAY 1

Honeywell T7350 Specifications

General

Brand	Honeywell
Model	T7350
Category	Thermostat
Language	English