Return Air Connections - Payne C Series Installation, Start-Up, Operating, Service And Maintenance Instructions

UPFLOW
90˚
120˚
MIN
OUTER DOOR
ASSEMBLY
8" MIN FOR DOOR
REMOVAL
(2) HEX NUTS, (2) WASHERS & (2) LOCK WASHERS
REQ. PER ROD

Return Air Connections

FIRE HAZARD
Failure to follow this warning could cause a fire, personal
injury, or death.
Never connect return-air ducts to the back of the furnace.
Follow instructions below.
Downflow Furnaces
The return-air duct must be connected to return-air opening
(bottom inlet) as shown in Fig. 19. DO NOT cut into casing sides
(left or right). Side opening is permitted for only upflow and most
D OWNFLOW
PREFERRED
PREFERRED
120˚
MIN
PERMITTED
Fig. 14—Duct Flanges
→ Fig. 15—Horizontal Unit Suspension
14
HORIZONTAL
90˚
PREFERRED
PREFERRED
120˚
MIN
PERMITTED
1 " THREADED ROD
/
4
4 REQ.
SECURE ANGLE
IRON TO BOTTOM
OF FURNACE WITH
3 #8 x
TYPICAL FOR 2 SUPPORTS
1" SQUARE, 1 1 " x 1 1 " x 1 " ANGLE IRON
/ / /
4 4 8
OR UNI-STRUT MAY BE USED
horizontal furnaces. Bypass humidifier connections should be
made at ductwork or coil casing sides exterior to furnace.
Upflow and Horizontal Furnaces
The return-air duct must be connected to bottom, sides (left or
right), or a combination of bottom and side(s) of main furnace
casing as shown in Fig. 18 and 20. Bypass humidifier may be
attached to unused side return air side of the furnace casing. (See
Fig. 18 and 20.)
Not all horizontal furnaces are approved for side return air
connections. (See Fig. 20.)
PREFERRED
PREFERRED
PERMITTED
" SCREWS
3
/
4
A02329
A05027