Safety Controls; Heating System Start-Up - Trane Precedent YHJ072A Installation, Operation And Maintenance Manual

ignite the indoor fan starts and circulates warm air through
the conditioned space.
When the air temperature rises to the thermostat setting
the thermostat deenergizes the heating electrical circuit,
which in turn extinguishes the burners. The indoor fan
continues to circulate warm air until most of the heat is
removed from the unit's combustion chamber.

Safety Controls

• The unit is equipped with an automatic reset safety limit
control to prevent overheating. When the control
opens, it shuts down the heating electrical circuit until
the unit cools down sufficiently. Inadequate airflow (i.e.,
caused by dirty filters or defective fan motor) may
cause the unit to cycle on and off as the limit trips and
automatically resets. If you suspect the unit is cycling
on its limit control, immediately contact a service
person for instructions
• If flames from the burner are not properly drawn into
the heat exchanger, a flame rollout protection control
will open causing the furnace to shut off. The cause
must be investigated by a qualified service person.
• If installed, the condensate overflow switch will shut
down the unit before a drain pan overflow occurs.

Heating System Start-Up

Because your unit has an automatic ignition system, it is
easy to start the heating cycle at the beginning of the
heating season. In order for the unit to operate properly
and safely, the furnace needs air for both combustion and
ventilation. Check to make sure that all air openings are
unobstructed and there is adequate clearance around the
unit to provide good air flow.
WARNING
Hazardous Voltage w/Capacitors!
Failure to disconnect power and discharge capacitors
before servicing could result in death or serious
injury.
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. For variable frequency drives
or other energy storing components provided by
Trane or others, refer to the appropriate
manufacturer's literature for allowable waiting periods
for discharge of capacitors. Verify with a CAT III or IV
voltmeter rated per NFPA 70E that all capacitors have
discharged.
1. Set the thermostat's heating adjustment lever at its
lowest setting.
2. Move the selector switch to the Off position.
3. Turn off all electric power to the unit.
RT-SVX075A-EN
Gas Heat Operation and Maintenance
WARNING
Risk of Burn!
Failure to follow instructions could result in serious
injury.
NEVER attempt to manually light the burner.
4. This unit is equipped with an ignition device which
automatically lights the burners.
5. Remove the access panel that contains the following
label:
Figure 66. Label
6. Change the ON/OFF switch to the OFF position.
Note: Some valves require the knob to be pushed in
slightly before turning.
WARNING
Hazard of Explosion or Fire!
Failure to follow instructions could result in death or
serious injury and equipment or property damage.
Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
IF YOU SMELL GAS, follow instructions below:
• Do not try to light any appliance.
• Do not touch any electrical switch.
• Do not use any phone in your building.
• Open windows and doors.
• Alert others and evacuate building immediately.
• From a phone outside of the building,
immediately call your gas supplier. Follow the
gas supplier's instructions. If you cannot reach
your gas supplier, call the fire department.
7. Wait (five) minutes to clear out any gas. If you then
smell gas, STOP and proceed with the instructions as
per above Warning. If you do not smell gas, go to the
next step.
8. Change the ON/OFF switch to the ON position.
9. Replace panel removed in
10. Turn on all electric power to unit.
11. Set thermostat to desired temperature and move the
selector switch to the ON position. The unit will now
operate automatically.
12. If the unit will not operate, follow the instructions in
"Turning Off Gas to Unit," p. 64
technician or gas supplier.
Step 5.
and call your service
63