I.C.E. GIDM-325 - Manual (Page 15)

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22. Make the final setting of the air shutter by checking the flue gases with an “Orsat” or other similar combustion
testing instrument. There should be no carbon monoxide and the carbon dioxide content should be within limits
prescribed by the local gas company. Make sure that the main air shutter is locked securely in place.
23. Recheck pilot to make sure that its operation has not deteriorated because of main shutter adjustment. If
necessary, readjust pressure regulator.
24. Modulation operation: see wiring diagram and modulating instruction sheets supplied with this unit for correct
set up.
25. If linkage between Butterfly valve and Burner (gravity unit only) and venter fan if power vented needs to be
adjusted from factory setting, (see below).
GIDM LINKAGE SET-UP WITH POWER VENTS
1. Install a manometer on suction at test port in pop-up door.
a) Ensure there is a negative pressure at that point on low fire through to high fire.
- .50 to - 75” W.C. low fire and -.01 to -.10 on high fire.
2. To increase exhaust move drive rod toward damper pin (decrease the distance between drive rod and center pin).
3. To increase combustion air move drive rod towards center pin (decrease the distance between drive rod and
center pin).
4. To ensure a negative pressure throughout full modulation range, you may have to speed up exhaust and or burner
damper to match gas flow to the burner.
Move drive rod closer to the drive pin on the butterfly valve, (this will reduce the movement of the burner
damper).
5. Adjust low and high fire on the stop screws on the butterfly valve.
NOTE: The motor is allowed to over run with the spring linkage set the travel on the Penn Johnson motor to ensure
it does not go to far or damage to the motor could occur.
MINIMUM EQUIPMENT TO START-UP AND SET-UP GIDM GAS BURNER
1. CO and CO
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tester.
2. Stack thermometer.
3. 0” to 10” W.C. gas pressure gauge or magnehelic 0” to 10” W.C.
4. U-tube manometer or -5” to +5” magnehelic gauge.
5. DC volt meter.