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All installations and services must be performed by qualified service personnel.
A. VENTING:
NOTE: On the OH5-85DXE*** it is possible to rotate the flue elbow (which is factory installed for vertical
discharge) 90° counterclockwise from the vertical position to adapt to various venting systems.
c CAUTION MUST BE TAKEN NOT TO EXCEED 90° ROTATION (OF THE FLUE
ELBOW) COUNTERCLOCKWISE OR RIGHT FROM THE VERTICAL POSITION.
ROTATION OF FRONT FLUE ELBOW
When an installation requires that the flue exit out the left hand side casing on a front flue unit, remove screw
securing the 90 deg. elbow and rotate it 90° counterclockwise. Then, by following the dimensions listed below,
locate the center point for the exit of the flue. Once the center has been located, use a scribe to mark the hole size.
Cut hole and extend flue through side casing.
A trim collar may be ordered from Thermo Products to hide the gap around the flue pipe. This trim collar, however,
is not required for operation. Trim collar/gasket part numbers(s) 14121 / 330073.
TABLE 1: Suggested size and position of flue pipe opening on left hand side of casing.
UNIT
DIA. HOLE
OH5-85DXE
6-1/2"
*
FRONT FLUE MODELS ONLY
"X" DIMENSION IS MEASURED FROM SEPARATOR PANEL.
"Y" DIMENSION IS MEASURED FROM THE BLOWER PAN ON "H" MODELS AND FROM THE BASE
ON "L" AND "C" MODELS.
NOTE: ROTATION OF FLUE PIPE IS ONLY ALLOWED FOR LEFT HAND SIDE VENTING
APPLICATIONS.
The OH5-85DXE*** may be vented through a standard correctly sized chimney.
B. DRAFT REGULATORS:
A draft regulator is supplied with the furnace and should be installed according to the regulator manufacturers
recommendations. With the burner operating, use a draft gauge to adjust the regulator to the proper setting. (refer to
the instructions enclosed with draft regulator to adjust to the proper setting). When the burner air supply and draft
are properly adjusted, the overfire draft should be a negative (-).01" to (-).02" WC
overfire air tap (See Fig. 8). This tap is provided in the upper burner mounting plate. To measure the flue draft,
punch a small hole in the vent connector pipe as close to the furnace as possible and always before the draft
regulator.
"X" DIM.
"Y" DIM.
4-3/4"
Fig 1: Recommended location for drilling hole to connect
vent pipe to the furnace through the left hand side casing.
FLUE DIA.
33-1/16"
6"
2
TRIM COLLAR/
GASKET PART #
14131/330005
1
, as measured at the 5/16"
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