Grain Systems PNEG-377 - Manual (Page 26)

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Fan and Heater
DISCONNECT AND LOCK-OUT POWER BEFORE SERVICING HEATER
1. Un-snap terminal strip tops from HF-7100 circuit board.
2. Remove HF-7100 board from Snap-track Mounting.
3. Remove HF-7034 Flame probe module (if you do not have this module you will have to install a
new flame sensor (THH-4179) in unit as well) from control box. Cut green and red wires from
sensor long enough to install onto HF-7318 board.
4. Install HF-7318 into Snap-track.
5. Snap terminal strip tops back onto new circuit board.
6. Remove Reset switch from front panel of control Box and unwire leads from terminal strip.
7. Drill out hole that reset was removed from to 1/2" diameter.
8. Install Red neon light (TFH-2021) in 1/2" hole. This is the flame-out light. Wire to terminals 11 and
5 as shown in diagram.
9. Jump terminals 17 and 18 as shown on diagram.
10. Install red and green wires onto terminals 3 and 4 as shown on diagram.
Note: terminal 3 must go to the flame sensor (not ground)
REPLACING HF-7100 BOARD WITH HF-7318