Smith Cast Iron Boilers GB300 User Manual

Page 42

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GB300 BOILER INSTALLATION AND OPERATION INSTRUCTIONS

Page 42

LIGHTING INSTRUCTIONS

A. If this appliance is equipped with a continuous pilot
it must be lit by hand. Follow the lighting instructions
exactly when lighting the pilot. If this appliance is
equipped with an intermittent pilot, the ignition control
will automatically light the pilot. Follow the operating
instructions and do not try to light the pilot or burner
by hand.

BEFORE LIGHTING smell all around the appliance

area for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.

C. Do not use this appliance if any part has been under
water. Immediately call a qualified service technician to
inspect the appliance and to replace any part of the
control system and any gas control which has been
under water.

CAUTION: To prevent being burned, stand clear of
the boiler during ignition and don't touch any hot
metal parts.

Continuous Pilot 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.

Set the operating control to off or its lowest setting.

Turn off all electric power to the boiler.

Close the manual main and pilot gas shut-off valves.

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.

Remove the front grill(s).

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 manifold have been
thoroughly checked for leaks.

Locate the pilot(s).

Open the petcock pilot valve.

10. Push and hold down the red button on the pilotstat.
Light the pilot with a match and wait approximately one
(1) minute before releasing the button. The button should
pop back and the pilot(s) remain lit. For two pilot systems
repeat this procedure for the other pilot. If a pilot will not
stay lit after several tries, adjust pilot reg to higher
pressure. Tur n reg clockwise to increase and
countercloskwise to decrease pressure. If pilot still fails
to light, close the manual pilot valve and call your service
technician or gas supplier.

11. With the pilot(s) lit, turn on all electric power to the
appliance.

12. Open the manual main gas shut-off valve.

13. Set the operating control so there's a call for heat.

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.