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CGTH USE AND CARE MANUAL
16
2. Turn off all electric power to the heater if service
is to be performed.
3. Turn off the manual gas valve in the heater
supply line.
5.6 Sequence of Operation
1. When the thermostat calls for heat, the blower
motor will energize.
2. When the motor approaches nominal running
speed, the pressure switch closes and activates
the ignition module which in turn initiates the
purge.
3. The ignition module then energizes the spark
igniter.
4. When sparking begins, the gas valve is ener-
gized.
5. If a flame is detected, the gas valve remains
open. When the call for heat is satisfied, the sys-
tem control mechanism de-energizes and the
gas valve is turned off.
6. If no flame is detected, the gas valve is closed,
and a purge period begins. After the purge
period, the ignition module energizes the spark
igniter and the gas valve. If a flame is still not
established, a third and final purge/ignition
sequence is begun. After three failed attempts,
the system control mechanism will lock out for a
period of one hour or until the unit is reset.
7. Reset is accomplished by removing power from
the heater for at least five seconds.
8. With a three-try module, when the flame is
established and then lost on the first or second
trial, the gas valve will automatically turn off. A
purge and trial for ignition will then occur.
5.7 Venting
As mentioned on Page 5, Section 3.7, it is the
Installer’s Responsibility to properly vent (exhaust)
the heater outside. Please make sure your heater is
vented. If it is not vented, do not use the heater.
Immediately call your installer.
Your heater may be vented in one of three ways:
horizontal through the wall, horizontal with an elbow
through the wall or vertical through the roof. You
should know the way your heater is vented. Refer to
the following drawings to determine the type of vent-
ing you have. If you are not sure, please contact your
installer.
FIGURE 9: Horizontal Venting Through The Wall
Carbon Monoxide Hazard
Heater must be exhausted outside.
Use materials supplied.
This heater needs fresh air for safe
operation and must be installed so
there are provisions for adequate
combustion and ventilation air.
Failure to follow these instructions
can result in death or injury.
WARNING
10' (3 m) max.
2' 6" (76.2 cm) min.
Optional Vent
Extension
3" (7.6 cm)
Flue Pipe
5" (12.5 cm) Air
Supply Pipe
Side View
Heater
Slope down 1/4"
(.6 cm) per foot
towards vent
terminal
Vent
Terminal
3" (7.6 cm) pipe is
slid through
end of terminal
6" (15.2 cm)
min.
Bird
Screen