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CS300 BOILER INSTALLATION AND OPERATION INSTRUCTIONS
14. The burners should light with proper boiler operation.
15. A boiler designed for use with natural gas should
have a manifold gas pressure of 3.5" WC on High Fire
and 0.8" WC on Low Fire for 2 stage units. On an LP
boiler, the manifold pressure should be 10" WC on
highfire, 2 stage firing not avaialble on LP models. To
adjust the manifold gas pressure see the GAS
PRESSURE ADJUST-MENT instructions in the BOILER
CHECKING & ADJUSTMENT section.
16. Test the ignition safety shutoff device. Close the
manual pilot valve. Within three minutes the pilotstat
should close de-energizing the main gas valve(s).
Repeat steps 9 through 14. Disconnect the thermo-
couple from the pilotstat, the main burners should go
out. Extinguish the pilot and reconnect the thermo-
couple. There should be NO gas flow to the main
burners with the pilot out! If gas flow is detected,
immediately turn the main manual shut-off valve off and
have the problem corrected.
Intermittent Pilot Ignition Systems
1. STOP! Read the safety information above. If, at any
time, the boiler will not operate properly, follow the
instructions "TO TURN OFF GAS TO BOILER" and call
your service technician or gas supplier.
2. Set the operating control to off or its lowest setting.
3. Turn off all electric power to the boiler.
4. Close the manual main and pilot gas shut-off valves.
5. Wait five (5) minutes** to clear out any gas. Then
smell for gas, including near the floor. If you smell gas,
STOP! Follow "B" in the safety information above (to the
left) on the label. If you don't smell gas, go to the next
step.
6. Remove the front grill(s).
7. Connect a manometer having a minimum capacity
of 20" WC to the outlet pressure port of the gas valve.
Make sure that the gas supply piping has been purged
of air and that all gas joints up to the gas valve have
been thoroughly checked for leaks.
8. Open the petcock pilot valve.
9. Turn on all electric power to the boiler.
10. Set the operating control to the desired setting.
11. The pilot(s) should automatically light. Do not try to
light the pilot(s) by hand!
12. With the pilot(s) lit, open the main gas shut-off valve.
13. The burners should light with proper boiler operation.
14. A boiler designed for use with natural gas should
have a manifold gas pressure of approximately 3.5" WC
on high fire and 0.8" WC on low fire. For an LP boiler,
the manifold pressure should be 10" WC. To adjust the
manifold gas pressure see the GAS PRESSURE
ADJUSTMENT instructions in the BOILER CHECKING
AND ADJUSTMENT section.
15. With the burners in operation, close the manual
shutoff valve in the gas supply line. As soon as the main
burner flames go out, open the manual shutoff valve. A
normal ignition sequence should take place. If the
burners fail to light the system will make two more
ignition attempts. If the burners have not lit after the last
ignition try, the gas valve will close and the system will
go into lock out. DO NOT attempt to reset the system
until the ignition system has been inspected and the
problem resolved.
With the burners in operation, interrupt the power to the
control circuit by lowering the operating control. The main
burners should go out. Reset the operating control, a
normal ignition sequence should follow.
To test the ignition safety shutoff device, close the
manual shutoff valve in the gas supply line. Within 6
seconds of main burner flame extinction, the main gas
valve solenoid should close with an audible noise.
A sparking noise should be heard while the ignition
module tries to light the pilot. After 1 minute the module
should lockout and the try for ignition end. Open the
manual shutoff valve in the gas supply line and reset the
ignition control system. A normal ignition sequence
should take place.
To Turn Off Gas To Boiler
1. Set the operating control to its lowest setting.
2. Turn off all electric power to the appliance if service
is to be performed.
3. Close the manual main and pilot gas shut-off valves.
Page 35
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