DUALAIR® HEATING AND COOLING UNITS INSTALLATION OPERATION AND SERVICE MANUAL
Figure 12: Automatic Burner Control Box Sequence
Supply 230 V |
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Flue Fan |
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Pressure Switch P | NO |
C | NC |
Ignition Spark
Start Gas Valve
Flame Signal
Burner sequence for Honeywell S4563 or S4565C |
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| RUN | DOWN | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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30 Sec. Purge*
ts**
Required Incoming Signals | Signals Output By Control | ||||||||||||||||||||||||||||||||||||||||||||||||
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*Purge time begins at pressure switch change over.
**ts=Safety time (S4563C=3 seconds [alternate 5 seconds]; S4565C=5 seconds)
If at any stage the flame fails, the control will go to "lockout". The red light will illuminate and the control must be manually reset before further start attempt.
Figure 13: Modureg Gas Valve
Moving Shaft
Max Pressure Adjustment
Min Pressure Adjustment
Plug for
Main Gas Valve
6.3mm AMP 
Terminals for 
Modulation 
Inlet Pressure
Gas Inlet
Modureg Modulating Regulator
Plug for
Main Gas Valve
Honeywell Gas Valve
Outlet Pressure
Gas Outlet
22
