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CTCU UNIT HEATER INSTALLATION OPERATION AND SERVICE MANUAL
16
Figure 9: Automatic Burner Control Box Sequence
Figure 10: Gas Valve for Heater Models 7 - 32
Burner sequence for Honeywell S4565C
Flame Signal
Start Gas Valve
Ignition Spark
Supply 230 V
CLOSE
DOWNRUN
START
ts = 10 seconds
Signals Output By Control
Required Incoming Signals
Flue Fan
Pressure Switch
P
C
NO
NC
30 Sec. Purge*
*Purge time begins at pressure switch change over.
If at any stage the flame fails, the control will go into "lockout". The red light inside the RESET
switch will illuminate and the control will need to be manually reset before any further start
attempt can be made.
Regulator
(Under Cover)
Inlet Pressure
Gas Inlet
Ignition Control
(Plugs into Gas Valve)
12 Cable Connector
Outlet Pressure
Screw
Ignition
Output
Flame
Probe
Connection
End View