18-EB40D1-1A-EN
27
burner ports for deposit buildup and corrosion.
Wipe and brush the inside of the burner and the
burner ports and then clean with a dry cloth. If the
deposit buildup or corrosion is excessive, replace
the burners.
FFlluuee HHoooodd aanndd CCoommbbuussttiioonn BBlloowweerr CClleeaanniinngg
NNoottee:: Never use combustible cleaning fluids on any
part of the furnace.
Before each heating season, the flue should be
inspected for signs of flaking rust and soot deposits.
DDiirrttyy fflluueess sshhoouulldd bbee cclleeaanneedd bbyy qquuaalliiffiieedd sseerrvviiccee
ppeerrssoonnnneell OONNLLYY using the following procedure:
1. Turn the comfort control to OOFFFF. Turn the main
power disconnect OOFFFF. Turn the manual gas valve
OOFFFF.
2. Remove the flue hood and the CONTROL/HEAT
access panel.
3. Remove the combustion blower assembly from the
flue box. Remove the flue box and the flue
restrictors.
4. Remove all wires from the gas valve while carefully
noting their locations.
5. Disconnect the gas supply line from the valve.
6. Remove the manifold retaining screws and pull the
burner-manifold assembly from the heat
exchanger.
7. Remove the inlet turbulators being careful not to
break or damage them.
8. Wipe the flue box and flue baffles clean with a
clean, dry cloth.
9. Replace all gaskets with new ones.
10. Replace all damaged or broken turbulators with
new ones.
11. Reassemble the unit by reversing Steps 2 through 7
above. Take care that all gaskets seat properly.
12. Check all wires for correct installation by referring
to the unit’s electrical wiring diagram in the
SERVICE FACTS.
13. Leak test all gas line connections with a soap and
water solution or the equivalent.
14. Re-install the CONTROL/HEAT access panels and
the flue hood.
15. Visually inspect the unit to ensure that the airflow
opening for combustion is not obstructed.
16. Follow “Unit Startup,” p. 24 to place the unit back
in service.
IInnddoooorr FFaann MMoottoorr ((IIDDMM)) SSppeeeedd TTaapp SSeettttiinngg
The 208/230 units are factory set to medium speed.
208/230 Volt Motor Tap Settings ()
High speed setting: On the IGN board:
1. Connect the "RD" wire to the "PARK" terminal.
2. Connect the (IDM) PR wire to the "BLOWER LOAD"
terminal.
Low speed setting: On the IGN board:
1. Connect the "RD" wire to the "BLOWER LOAD"
terminal.
2. Connect the (IDM) PR wire to the "PARK" terminal.
UUnniitt SSttaarrttuupp
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