Thermo Pride OPA Installation And Service Manual page 41

All installations and services must be performed by qualified service personnel.
c. Make certain the thermostat will automatically start and stop the
appliance.
NOTICE: Heat exchanger oil will burn off on initial firing creating an
unpleasant odor. To prevent this odor from occurring more than once, it
is suggested the heating section be allowed to run for 30 minutes, or
until odor has dissipated.
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