DF Series installation manual
19
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8.
HEATER SHUTDOWN
•
EXTENDED SHUTDOWN
When the heater is shutdown for an extended period of time, it is recommended that
the gas and electric power supply be shut off.
Before turning on the heater after an extended shutdown, make sure the air is purged
from the gas pipes and that the gas pressure is adequate. An inspection is
recommended to make sure that everything is in order. Redo start-up.
•
HEATER EMERGENCY SHUTDOWN
When the heater must be shut down for an emergency, the main power disconnect
should be turned OFF and gas supply be shut off by closing the manual gas supply valve
located on the gas supply line to the heater.
•
TURNING ON THE HEATER AFTER A FLAME FAILURE ALARM
After a flame failure alarm, the following checks must be performed:
a.
Verify the alarm code on the flame supervision relay and consult the
troubleshooting section of this manual;
b.
Set the main power switch to OFF;
c.
Ensure that all gas supply manual valves are open;
d.
Check the blower belts; replace or adjust them if necessary;
e.
Check flame safeguard relay and fire rod condition;
f.
Check condition of filters and replace them if necessary;
g.
Ensure that nothing obstructs the air inlet and/or outlet of the heater;
h.
Ensure that nothing prevents proper operation of inlet and/or outlet air
dampers;
i.
Turn ON main disconnect;
j.
Press the reset button of the flame safeguard relay;
k.
Ensure that the air inlet and outlet dampers are operating properly;
l.
Ensure that the blower motor is operating and fan is turning;
m.
Ensure that the pilot ignites properly;
n.
Observe main flame lighting sequence.
If the heater still does not start, call the manufacturer or an authorized service
company for assistance.
