Service Manual

INSTALLATION CONSIDERATIONS

Installation Positions

*MVC96 models may be installed up flow or horizontally

with left or right side down. *CVC96 models may be installed

down flow or horizontally with left or right side down. Do not

install any furnace on its back.

Horizontal Installations

1. Horizontal installations require 5.5" under the furnace

to accommodate the drain trap.

2. Horizontal furnaces must be installed with ¾” slope from

back to front to permit condensate flow towards the

front of the furnace.

When installing a *MVC96 horizontally with the left side

down, there are two options for connecting the vent pipe to

the furnace.

1. Venting may be connected to the furnace vent pipe fit-

ting on the original top (now the end) of the furnace

2. The internal vent pipe and elbow may be removed from

the furnace to permit the vent to exit the top (original

side) of the furnace. If this option is used, an RF000142

Vent-Drain coupling must be used to keep condensate

from collecting in the inducer assembly.

Refer to the following instructions and illustration.

Insert flange. Cut 2 ½” long.

R 000142F

Vent/Flue Pipe Cuts

1. Remove screws from vent flange.

2. Remove internal elbow and vent pipe.

3. Cut pipe 2 1/2” from flange.

4. Remove cabinet plug adjacent to inducer outlet and in-

stall an original cabinet vent hole.

5. Install RF000142 coupling on inducer outlet.

6. Install flanged vent section removed in step 2 & secure

with clamps.

7. Secure flange to cabinet using screws removed in step

90% Furnace Recommended Installation Positions

NOTE: Alternate "vertical" piping connections can not be

used when an upflow 90% furnace is installed with supply

air discharging to the right or when a counterflow furnace is

installed with supply discharging to the left. In this case,

use the standard flue and combustion air piping connec-

tions