MG3P Installation Manual

21
Vent Couplings
MG3 series furnaces require couplings to be installed over the
combustion air finish flange and where the vent pipe exits the
furnace cabinet. See Figure 31.
NOTE: These couplings are not supplied in the MG3S extra
parts bag.
• Each coupling must be secured to the finish flange or vent
pipe with a hose clamp (if using neoprene couplings).
• Upflow furnaces require the 3” neoprene coupling clamps to
be installed above the coil box.
Upflow Furnaces: Combustion air and exhaust vent piping
must have removable connections between the furnace flanges
and vent pipes when installed vertically in front of the coil box.
NOTE: Both vent pipes must be long enough to clear the height
of the coil box when installed. This allows for future servicing or
maintenance of the coil.
Position the 2” x 3” neoprene coupling between the top of the
2” vent pipe and the 3” vent pipe. Secure both ends of the
couplings with hose clamps, ensuring that the connection is
tight and leak free.
Downflow Furnaces: Since there is no coil box above the
furnace, both 3” vent pipes can be run vertically for the entire
length of the pipes from the 2” x 3” coupling to the outdoors.
Secure both ends of the couplings, ensuring that the connection
is tight and leak free.
Filter Retainer Brackets
1. Bend the rear, right and left side furnace flanges upward 90°
with a pair of wide duct pliers. See Figure 32 (page 22).
2. Install three filter retainer brackets on the furnace flanges.
NOTE: Press down firmly to ensure brackets are tightly
installed on the furnace flanges.
3. Position a furnace filter on top of the filter brackets.
VentilAire™ Bracket
Ventilation must be provided for homes built to HUD Manufactured
Homes Safety and Construction Standards. This ventilation can
be supplied by a VentilAire™ kit. Please refer to the technical
sales literature for part numbers. Alternate means for providing
ventilation air must meet the requirements of all applicable local
and federal codes.
Upflow Furnaces: the means for providing the required
ventilation must be incorporated into the upflow furnace base
or the return air ductwork to the furnace.
2” PVC TEE
2” x 1/2” PVC
Reducer
1/2” x 1/2”
Hose Barb
1/2” x 3/4”
Hose Barb
2” PVC Pipe from
Inline Drain Assembly
(Not Included)
1/2” Tu bing Formed
into a Loop (Field Supplied)
1/2” Tu bing
(Field Supplied
)
2” PVC ELBOW
(Field Supplied)
PVC Tr ap
2” PVC Te e
2” x 1/2” PVC
Reducer
1/2” x 1/2”
Hose Barb
1/2” x 3/4”
Hose Barb
2” PVC Pipe from
Inline Drain Assembly
(Not Included)
1/2” Tu bing Formed
into a Loop (Field Supplied)
1/2” Tu bing
(Field Supplied
)
PVC Tr ap
Installation of PVC Components (Typical Orientation)
Installation of PVC Components (Alternate Orientation)
Figure 30. PVC Components
Figure 31. Vent Couplings
Coil Box
UPFLOW FURNACE
DOWNFLOW FURNACE
3” PVC Pipes
2” x 3”
Neoprene
Couplings
3” PVC
Pipes
3” Neoprene
Couplings
3” PVC Pipes
2” x 3”
Neoprene
Couplings
2. Install the reducer or PVC trap (if supplied) on the bottom
end of the PVC Tee. Permanently bond them together using
appropriate primer and cement.
3. Install the 1/2” x 1/2” hose barb on the 2” PVC reducer. NOTE:
Do not over tighten! Use an adequate amount of Teflon tape
on the threads. Do not use liquid sealants.
4. Verify all connections and joints for tight fit and proper alignment
with other vent pipes.
Alternate Orientation
1. Install the 2” PVC Tee horizontally on the 2” vent pipe that
is extending out the side of the cabinet. Permanently bond
them together using appropriate primer and cement. Refer
to the alternate orientation shown in Figure 30.
2. Install the 2” PVC Elbow on the end of the 2” PVC Tee.
Permanently bond them together using appropriate primer
and cement.
3. Install the reducer or PVC trap (if supplied) on the bottom
end of the PVC Tee. Permanently bond them together using
appropriate primer and cement.
4. Install the 1/2” x 1/2” hose barb on the 2” PVC reducer.
NOTE: Do not over tighten! Use an adequate amount of Teflon
tape on the threads. Do not use liquid sealants.
5. Verify all connections and joints for tight fit and proper alignment
with other vent pipes.