Units equipped with intermittent pilot-based operation are
fitted with a Honeywell gas valve. The gas valve has a built-in
pressure regulator and a hot surface intermittent pilot ignition
control for safe operation. The valve has a step open feature
(standard) for natural gas operation. For propane, a full open
feature is standard. Explanation of the gas valve is shown in the
illustration.
Step #1 - CHECKING PRESSURE
A. Turn gas connection OFF. Open gas inlet pressure
connection cap and unscrew the tap. Connect pressure
gauge at pressure tap. Read pressure.
B. If pressure measured is higher or lower than that specified
in the Pressure Table located in this manual, do not proceed
with initial operation.
C. Remove pressure gauge, screw in the tap and close with
protective cap.
Step #2 - ADJUST PILOT BURNER
The pilot burner assembly installed in your unit is tested prior
to shipment and does not require any adjustment. If adjustment is
desired, follow these instructions.
This step must be performed by a
qualified person only.
A. Turn main power switch ON, and switch the ignition
control switch on the gas valve to ON position.
B. Set temperature and timer and press the START/STOP key.
Follow oven operational instructions.
C. The pilot flame should be lit and blue in color with no or
very little yellow peaks.
Step #3 - MANIFOLD PRESSURE ADJUSTMENT
The gas valve has a built-in pressure regulator and regulates the
manifold pressure according to specification presented in the
Pressure Table in this manual. The valve requires no adjustment.
However, if adjustment is desired, follow the instructions below.
This must be performed by a qualified person only.
A. Turn power and gas supply OFF.
B. Remove protective cap from outlet gas/manifold gas tap.
Unscrew, connect pressure gauge.
C. Turn main power switch ON, and switch the ignition
control switch on the gas valve to ON position.
D. Select program, set temperature and timer, and press the
START/STOP key. Follow oven operational instructions.
E. The gas valve will open and the main burner flame should
be established.
F.
Measure manifold pressure. If it requires adjustment, open
the cap on the pressure regulator and adjust the screw for
increased or decreased gas pressure.
D
O NOT SET THE REGULATOR TO ANY OTHER SETTING
OTHER THAN TO THE DATA SPECIFIED IN THE
PRESSURE CHART
IN THIS MANUAL.
G. Turn the gas valve OFF or to PILOT position.
H. Close pressure regulator and manifold/outlet gas tap with
protective caps.
NOTE: If you do not understand this procedure, do not perform
any changes. Call the factory for assistance.
Step #4 - IGNITION & BURNER CHECK
For all practical reasons this will be the only check necessary
during initial operation by the installer. After the installation is
complete the oven needs to be test fired to ensure that the system is
operating properly. Follow the operating instructions posted on
the front of the unit.
The flame pattern both under hot and cold conditions should be
stable on all burner ports and there should be no lifting or blowing
after 15 seconds of operation.
See the illustration in this manual for
the proper flame pattern.
There is no air shutter adjustment on these
burners and if the flame pattern does not match that shown,
contact the factory for further directions.
Make sure that the pilot burner is lighting quickly from the
electric ignitor. Then make sure that the main burner is lighting
quickly (within 4 seconds), smoothly (no harsh noise), and without
any problems. While the oven is COLD, cycle the oven ON and
OFF five times to make sure everything is working properly.
Allow the unit to heat up for 5 minutes and repeat the process.
Check the flame pattern on the burners. The flames should be
blue in color with little or no yellow in the flame. On propane gas
some yellow tipping is normal, but there should be no indication
that soot will form on the combustion chamber walls, pilot or main
burner from the yellow tipping.
Step #5 - VERIFY SEQUENCE OF OPERATION
When the Gas Combitherm is fitted with an intermittent pilot
and a Honeywell gas valve, the system is ready for automatic pilot
ignition and main burner ignition. The ignition control system will
routinely undergo three ignition trials (for pilot burner ignition)
before identifying an ignition failure to timeout. The normal
sequence of operation is illustrated on the following page of this
manual.
When starting unit after initial installation, the gas lines must be
free of air. It may take up to 30 minutes to do this. If, after this
time there is no pilot, call for factory assistance.
Operation and Care Manual #6011 • 6
1.15 - INTERMITTENT PILOT - HONEYWELL
I n s t a l l a t i o n • S e c t i o n 1
