Grain Systems PNEG-588-04 - Manual (Page 30)

7. Service
30 PNEG-588-04 Deluxe Downwind Heater Installation and Operation
10. LP MODELS ONLY - After heater has been operating for some time and temperatures have
stabilized, check temperature of the gas line between outlet side of vaporizer and the gas regulator.
If gas line becomes “frosted” with an accumulation of ice build-up, adjust vaporizer slightly closer to
the flame. If line reaches a high temperature where it is hot to the touch, adjust vaporizer further away
from the flame.
NOTE: If gas temperature exceeds approximately 220°F, the vapor high-limit thermostat will
open the electrical circuit to the liquid gas solenoid valve and shut off fuel flow to stop the
heater. This condition can be verified by temporarily connecting a jumper wire across the
connections of the high-limit and observing that the burner re-lights. If high-limit vapor
thermostat causes the burner to stop operating, it may also cause the burner to go into a
safety lock out condition. Refer to heater operating instructions for restarting procedure.
11. Vaporizers should be inspected and serviced prior to each season of operation, including
the following:
a. Carefully inspect the surfaces of the vaporizer coil and the inlet and vapor outlet pipes for
evidence of severe corrosion or abrasion of metal which could cause subsequent leakage of
liquid propane, gross overheating and fire hazard.
b. Insecure mounting of either the vaporizer or burner, due to loosened bolts, can cause interference
between burner vanes and vaporizer pipes, with the natural vibration of the unit causing erosion
of the pipe metal at the point of maintained contact.
c. If there has been significant abrasion of the steel vaporizer pipe, it must be replaced.
12. When satisfied that heater is operating properly, make sure to reset the control device to the proper
setting and restore the fan and heater for normal type operation.
IMPORTANT: Use care when troubleshooting this product. Limit exposure to potential hazards by
following all recommended safety practices.