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TF-SERIES INSTALLATION, OPERATION AND SERVICE MANUAL
50
SECTION 12: OPERATION AND MAINTENANCE
The heater is equipped with a dual direct spark
ignition system.
12.1 Sequence of Operation
1. Turn the thermostat up, the blower motor will
energize.
2. When the motor approaches nominal running
RPM, the pressure switches will close and acti-
vate the ignition module.
3. After a 45 second purge period, the ignition
module then opens the gas valve and energizes
both spark igniters. The light will be illuminated
at any time the gas valve is energized.
4. When both flames are established, the sparking
sequence ceases.
5. If both flames are not established during the
ignition sequence, the ignition module closes
the gas valve and purge begins. The module will
try two additional times for ignition with purge
between trials. If ignition is not established dur-
ing either of these trials, the module will lock out.
6. After lock ou
t has occurred, the ignition module
must be re-set by turning down the thermostat
(disconnecting power) for five seconds, and rais-
ing it again to the desired temperature.
7. When the thermostat is satisfied, all power to
the heater is shut off.
12.2 To Shut Off Heater
Set thermostat to lowest setting.
Tu rn OFF electric power to heater.
Tu rn OFF manual gas valve in the heater supply line.
12.3 To Start Heater
Tu rn gas valve and electric power OFF and wait five
minutes for unburned gases to vent from heater.
Tu rn ON main gas valve.
Tu rn ON electric power.
Set thermostat to desired temperature. Bu rner
should light automatically.
12.4 Pre-Season Maintenance and Annual
Inspection
To ensure your safety and years of trouble-free
operation of the heating system, ser
vice and annual
inspections must be done by a contractor qualified in
the installation and service of gas-fired heating
equipment.
Tu rn off gas and electric supplies before performing
service or maintenance. Allow heater to cool before
servicing.
Before every heating season, a contractor qualified in
the installation and service of gas-fired heating
equipment must perform a thorough safety
inspection of the heater.
For best performance, the gas, electrical, thermostat
connections, tubing, venting, suspensions and
overall heater condition should be thoroughly
inspected.
NOTE: Gas flow and burner ignition are among the
first things that should be inspected. Please see
Page 51, Section 12.5 for suggested items to
inspect.
Cut/Pinch Hazard
Wear protective gear
during installation,
operation and service.
Edges are sharp.
WARNING
Failure to follow these instructions can result in death, electric shock, injury or property damage.
Burn Hazard
Allow heater to cool
before service.
Tubing may still be hot
after operation.
Explosion Hazard
Turn off gas supply to
heater before service.
DANGER
Electrical Shock Hazard
Disconnect electric
before service.
Heater must be
connected to a properly
grounded electrical
source.