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PRE-INSTALLATION INSPECTION
Inspect the shipping container and furnace for any evidence
of shipping damage.
If furnace damage is found, notify freight carrier and file
claim.
NOTE:
Some models are equipped with a shipping strap on
the blower motor shaft which supports the blower motor dur-
ing shipping. This strap must be removed before the furnace
is operated for the first time. It can be removed by removing
the two fastening screws.
CODE COMPLIANCE
The furnaces described in these instructions are design certi-
fied to be in compliance with the latest edition of American
National Standard Z21.47. In Canada, these furnaces are
design certified by the Canadian Gas Association to be in
compliance with the latest edition of CSA 2.3.
These furnaces are forced air type and may be utilized for
indoor installation in manufactured buildings (modular only),
or buildings constructed on site. These furnaces are not certi-
fied for installation in mobile homes, trailers or recreational
vehicles.
The installer must conform to all state, local and provincial
building codes when installing these appliances. In the
absence of state, local or provincial codes, these furnaces
and related equipment must be installed in accordance with
the latest issue of the following:
NATIONAL FUEL GAS CODE - ANSI Z223.1
NATIONAL ELECTRICAL CODE, ANSI/NFPA 70.
Applicable codes take precedence over any recommendation
made in these instructions.
In Canada, the installer must conform to the CAN/CGA-B149
Installation Codes, the Canadian Electrical Code, Part I, CSA
C22.1, local plumbing or waste water codes, and other appli-
cable local codes.
INSTALLATION POSITION
(50-125 MBH Models)
This furnace may be installed in an upflow, downflow or hori-
zontal position. Depending on the configuration shipped from
the factory, it may be necessary to convert the furnace from
downflow to upflow or from upflow to downflow configuration.
Use conversion instructions starting on Page 5 and Page 6.
INSTALLATION POSITION
(150 MBH Models)
This furnace may be installed in an upflow or horizontal poi-
sion. No conversion is necessary.
4
CONVERSION INFORMATION
(50-125 MBH Models)
This furnace may be shipped in either the upflow or the
downflow configuration. To convert from upflow to downflow
or vice-versa it is necessary only to exchange the top and
bottom casing caps and to rotate the vent blower 180
degrees. Use the step by step instructions on Page 5 and
Page 6.
TO CONVERT FROM DOWNFLOW TO
UPFLOW CONFIGURATION
(50-125 MBH Models)
1.
Lay the furnace on its back.
2.
Remove the front door.
3.
Remove the seven sheet metal screws that are used to
fasten the top cap to the casing. Remove the top cap
and save the screws.
4.
Remove the four sheet metal screws that are used to
fasten the bottom cap to the casing. Remove the bottom
cap and save the screws.
5.
Unplug the vent blower wires.
6.
Disconnect the pressure hose from the vent blower.
7.
Remove the four machine screws that fasten the vent
blower to the vent pan and save the screws. Leave the
gasket in place on the pan.
8.
Remove the two extra machine screws in the vent pan
front and save the screws.
9.
Rotate the vent blower and transition 180° so that its out-
let points to the outlet air end of the furnaces as shown in
Figure 2.
10. Line up the vent blower mounting holes with the holes in
the vent pan and screw it into place. Use the same
machine screws that held the vent blower in place previ-
ously.
11. Install the two extra machine screws in the two open
holes in the front of the vent pan See Figure 2.
12. Plug in the vent motor wires.
13. Plug the pressure hose into the vent blower.
14. Remove the rectangular knockout in the center of the top
cap. See Figure 5.
15. Install the top cap at the same end of the furnace as the
vent blower, using the sheet metal screws saved earlier.
See Figure 2.
16. Install the bottom cap on the bottom of the furnace using
the sheet metal screws saved earlier. See Figure 2.
17. The conversion is now complete. The furnace may now
be installed in the upflow position or in the horizontal
position on either side.
035-15241-003 Rev. A (201)
Unitary Products Group
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