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CTCU UNIT HEATERS INSTALLATION OPERATION AND SERVICE MANUAL
22 of 42
11.4 Begin Commissioning
11.4.1 Before Operating the Heater
To ensure that all the controls are in safe working
order, operate the heater for the first time with the
isolating gas valve turned off.
1. Turn off the gas isolating valve
2. Using the installed external control, turn on the
burner. The automatic sequence will now begin
as described on Page 22, Figure 11.
There will be no ignition of the burner and lockout
will occur, which proves the controls are operating
correctly.
Figure 11: Automatic Burner Control Box Sequence
NOTE: If the heater operates for more than 24 hours continuously, the ignition module will automatically
recycle the burner to ensure that all safety functions are still in working condition.
P
P
Fan Neon
Burner Neon
Neon
Ignition
Gas
Valve
Flame
Sensing
Pressure
Switch
Fan
Thermostat
KEY TO
SYMBOLS
T0 T1 T2 T3 T4 T5 T6 T7
10 sec
Tp
40 sec max.
Interruption of main
Tp
10 sec
Ts
10 sec
flame sensing
11 sec typical
T8
Lockout Alarm
Signal (optional)
Burner Lockout
signal received after
3 ignition trial
failures