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COUNTERFLOW FURNACE INSTALLATION
For installation of your humidifier on a counterfiow
furnace, see Fig. 6. Connect the humidifier to the
suppiy air pbnum using Remote Installation Kit,
Sears Stock No. 9372.
COUNTERFLOW FURNACE iNSTALLATiON
_-_ From Supply
Air Pbnum
GRAVITY FURNACE INSTALLATION
The humidifier works well on gravity furnaces because
of its self-contained blower system. Use the Remote
Installation Kit, Sears Stock No. 9872. The humidifier
must be at least 6" away from the pUenum, due to the
higher operating temperature of the furnace.
NOTE: Furnace temperatures above 250°F may
cause failure of fiberglass parts.
Fiber Plenum Ducts
NOTE: The mounting screws supplied are for standard
installation on sheet metal plenum ducts.
If you have fiber plenum ducts, install the plenum
stiffener and components with thru-bolts, nuts, and
washers (not supplied). Jfnecessary, reinforce the
humidifier mounting area on fiber ducts with sheet
metal and provide additional bracing as required to
support the weight of the humidifier and water. (This
fiber duct installation hardware is not supplied and
must be purchased from you local hardware store.)
You may also consider using the remote mount instal-
lation if you have fiber ducts. Purchase the Remote
Installation Kit separately from Sears, Stock No. 9372.
1. The Plenum Stiffener is mounted on the supply
air plenum. Mark a level line at bast 2" above the
top of the furnace on the selected surface, if
front service method (Fig. 2) is used. If the
humidifier is to be serviced from the bottom (Fig.
3), mark a level line at least 71/2" above the top of
the furnace. Hold stiffener against the plenum
with the bottom edge on a level line and bent
edge flanges towards you. Using a pencil, mark
the location of all hobs except hob "A" on
plenum (Fig. 7).
SUPPLY AiR PLENUM
(Wider Than Stiffener)
Mounting
Tabs
Reference
Holes
Min.
Clearance
2" to service from front (Fig. 2)
7'/2" to service from bottom (Fig. 3)
Fig, 7
Reference
7 HUes
/
Level
-- -- Line
Mounting Hobs
If plenum is narrower than stiffener:
The stiffener can be mounted on a plenum as narrow
as 131/2'L The stiffener sides wiii extend past the
plenum (Fig 8). Begin installation as follows:
New mounting hobs wiii have to be drilled.
Drill the new holes only as far from the edge
as necessary. Use a 1/8" drill biL
Mark outline of rectangle as shown in Fig 8.
Cut out this area of supply air plenum. If edges
are rough, file them smooth.
Proceed to step 6.
SUPPLY AiR PLENUM
(Narrower Than Stiffener)
Plenum_
Stiffener
Fig, 8