Page 5
Installation − Setting Equipment
WARNING
Do not install the furnace on its front or its back. Do
not connect the return air ducts to the back of the fur-
nace. Doing so will adversely affect the operation of
the safety control devices, which could result in per-
sonal injury or death.
Select a location that allows for the required clearances
that are listed on the unit nameplate. Also consider gas
supply connections, electrical supply, vent connection,
condensate trap and drain connections, and installation
and service clearances [610 mm (24 inches) at unit
front].
The unit must be level from front to back and side
to side.
NOTE − G61MPVT−36B units with 1/2 hp blower motors are
equipped with three flexible legs and one rigid leg. The rigid
leg is equipped with a shipping bolt and a flat white plastic
washer (rather than the rubber mounting grommet used
with a flexible mounting leg).
The bolt and washer must
be removed before the furnace is placed into opera-
tion.
After the bolt and washer have been removed, the rig-
id leg will not touch the blower housing.
NOTE − G61MPVT−60D−135 units are equipped with a
shipping pad under the blower housing. Remove the ship-
ping pad prior to operation.
Allow for clearances to combustible materials as indicated
on the unit nameplate. Minimum clearances for closet or al-
cove installations are shown in figures 3, 9 and 6.
WARNING
Blower access panel must be securely in place when
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into
living space resulting in personal injury or death.
WARNING
Improper installation of the furnace can result in per-
sonal injury or death. Combustion and flue products
must never be allowed to enter the return air system
or air in the living space. Use sheet metal screws and
joint tape to seal return air system to furnace.
In platform installations with furnace return, the fur-
nace should be sealed airtight to the return air ple-
num. A door must never be used as a portion of the
return air duct system. The base must provide a
stable support and an airtight seal to the furnace. Al-
low absolutely no sagging, cracks, gaps, etc.
For no reason should return and supply air duct sys-
tems ever be connected to or from other heating de-
vices such as a fireplace or stove, etc. Fire, explo-
sion, carbon monoxide poisoning, personal injury
and/or property damage could result.
Upflow Applications
The G61MPVT gas furnace can be installed as shipped
in the upflow position. Refer to figure 3 for clearances.
Installation Clearances
Top
Bottom (Floor)
Left Side
Right Side
Top/Plenum
25 mm (1 in.)
*Front
0
Back
0
Sides
0
†
Vent
0
Floor
0
‡
*Front clearance in alcove installation must be 610 mm (24 inch-
es). Maintain a minimum of 610 mm (24 inches) for front service
access.
†
Allow proper clearances to accommodate condensate trap and
vent pipe installation.
‡
For installations on a combustible floor, do not install the furnace
directly on carpeting, tile or other combustible materials other
than wood flooring.
FIGURE 3
Return Air −− Upflow Units
NOTE − G61MPVT−135 models are not approved for
installation in upflow air discharge applications.
Return air can be brought in through the bottom or either
side of the furnace installed in an upflow application. If the
furnace is installed on a platform with bottom return, make
an airtight seal between the bottom of the furnace and the
platform to ensure that the furnace operates properly and
safely. The furnace is equipped with a removable bottom
panel to facilitate installation.
Markings are provided on both sides of the furnace cabinet
for installations that require side return air. Cut the furnace
cabinet at the maximum dimensions shown on page 2.
NOTE − When air volumes over 850 L/s (1800 cfm) are
required with 60C or 60D models in an upflow applica-
tion, the following return air options are available:
1 − Return air from single side with transition which will ac-
commodate508 x 635 x 25 mm (20 x 25 x 1 in.) air filter.
(Required to maintain proper air velocity.) See figure 4.
2 − Return air from single side.
3 − Return air from bottom.
4 − Return air from both sides.
