MG & SG Series Boilers – Installation and Service Manual
14
b. Intermittent pilot
This boiler does not have a continuous pilot flame. It is equipped with an ignition device which
automatically lights the pilot. Do not try to light the pilot by hand.
In the event of failure of any component, either the system will not operate or it will go into safety lockout.
1) Make sure the Gas Valve and all electrical power to the boiler are "OFF".
2) Set room thermostat to the lowest setting.
3) Connect a manometer at pressure tapping on downstream section of gas valve.
4) Wait five minutes to clear out any gas. If you smell gas, STOP! Follow the safety instructions
provided in Section 1.1 under WHAT TO DO IF YOU SMELL GAS. Remember that propane does
not vent upward naturally.
5) Check the ignition control module as follows:
a) Set thermostat above room temperature to call for heat and turn power on for the boiler.
b) Watch for spark at pilot burner on units equipped with spark ignition. All models will
automatically lockout if no pilot flame is detected within 15 seconds. Automatic retry will
occur in 5 minutes.
6) Turn Gas Valve to ON. Pilot burner should ignite, followed by main burners. Check main and
pilot burners and adjust pilot, if necessary, as described in Section 3.3.
7) Assure that all other gas appliances are turned off, including their pilot flames.
8) Check manifold pressure reading on the manometer and make necessary adjustments. Check
burner input to match rating plate input.
9) Return thermostat and controls to normal operation settings.
c. Hot Surface Ignition
This boiler does not have a continuous pilot flame. It is equipped with an ignition device which
automatically lights the pilot. Do not try to light the pilot by hand.
1) Make sure the Gas Valve and all electrical power to the boiler are "OFF".
2) Set room thermostat to the lowest setting.
3) Connect a manometer at pressure tapping on downstream section of gas valve.
4) Wait five minutes to clear out any gas. If you smell gas, STOP! Follow the safety instructions
provided in Section 1.1 under WHAT TO DO IF YOU SMELL GAS. Remember that propane
does not vent upward naturally.
5) Set room thermostat to call for heat.
6) Turn on the gas valve.
7) Turn on all electrical power to the boiler. The hot surface element should glow bright orange and
ignite the pilot, followed by the main burners. Check main and pilot burners and adjust pilot, if
necessary, as described in Section 3.3.
8) Assure that all other gas appliances are turned off, including their pilot flames.
9) Check manifold pressure reading on the manometer and make necessary adjustments. Check
burner input to match rating plate input.
10) Return thermostat and controls to normal operation settings.
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