Counterflow Furnace Installation

SUPPLY AiR PLENUM (Wider Than Stiffener)

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

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

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).

If plenum is narrower than stiffener:

The stiffener can be mounted on a plenum as narrow as 131/2'LThe 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

303.9380612 specifications

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