Thermo Pride GMD1-80N Installation And Service Manual page 29

All installations and services must be performed by qualified service personnel.
NOTICE: All controls on the unit should be checked for proper functioning prior to the
qualified service personnel leaving the job site. Specifically the following should be
checked:
With furnace in normal heating operation, check to make certain blower will start and
stop automatically under control of integrated fan control.
1. Check safety limit control as follows:
a. Shut off incoming power.
b. Block return air opening or disconnect blower motor leads.
c. Restore power to furnace.
d. Set thermostat above room temperature calling for heat.
e. When high air temperatures are reached in furnace at limit control setting with
blower out of operation, burner should shut off.
f. Shut off electrical power.
IMPORTANT: Remove blockage or reconnect blower motor and restore power.
2. Make certain thermostat will automatically start and stop furnace.
3. Block the flue pipe outlet gradually until the pressure switch functions shutting off
the main burners.
4. Block the inlet gradually until pressure switch functions shutting off the main burners.
IMPORTANT: Remove flue or air inlet blockages when done.
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