Sears 8MPL050B12B1, 8MPL075B12B1, 8MPL075F16B1, 8MPL100F20B1, 8MPL100J20B1, 8MPL125J20B1, 8MPN050B12B1, 8MPN075B12B1, 8MPN075F16B1, 8MPN100F14B1, 8MPN100F20B1, 8MPN100J20B1, 8MPN125J20B1, 8MPN150J20B1, N8MPL050B12B1, N8MPL075B12B1, N8MPL075F16B1, N8MPL100F20B1, N8MPL100J22B1, N8MPL125J20B1, N8MPL125J22B1, N8MPN050B12B1, N8MPN075B12B1, N8MPN075F16B1, N8MPN100F14B1, N8MPN100F20B1, N8MPN100J22B1, N8MPN125J20B1, N8MPN125J22B1 o

Duct Design and Duct Installation Requirements

See Section 10.

Internal Filter in Top Return Installation

When instal ling top-mounted filter inside the furnace, install the fil-

ter clips on the edge of the top duct opening with the wider end of

the clips toward the blower as shown in Figure 32. Clips may be

obtained from your distributor or fabricated from sheet metal

(Figure 33). Insert filterintosideclips firstand push filter backuntil

it is fully engaged into back clip.

Top Mounted Internal Filter

Clip

side-to-side

26 Ga. Galvanized Steel

NOTE: If filters are only suitable for heating application, ad-

vise homeowner that filter size may need to be increased if air

conditioning is added.

Addition Of Air Conditioning

See Section 10.

12. Checks and Adjustments

Startup

NOTE: Refer to startup procedures in the Users Information

Manual.

ELECTRICAL SHOCK, FIRE, OR EXPLOSION

HAZARD.

Failure to follow safety warnings exactly could

result in death, personal injury and/or property

damage.

If any sparks, odors or unusual noises occur,

immediately shut OFF gas and power to furnace.

Check for wiring errors or obstruction to blower.

GasSupply Pressure

Gas supply pressure should be within minimum and maximum val-

ues listed on rating plate. Pressures are usually set by gas suppli-

ers.

(See LP Gas Conversion Kitinstruction manual for furnaces con-

verted to LP gas.)

FIRE OR EXPLOSION HAZARD.

Failure to turn OFF gas atshut off before connecting

manometer could result in death, personal injury

and/or property damage.

Turn OFF gas at shut off before connecting

manometer.

1. With gas OFF, connect manometer tomanifold pressure tap

on outlet of gas control valve. See Figure 34. Use a manome-

ter with a 0" to 12" water column range.

Typical Gas Control Valve Honeywell

RegulatorAdjustment

UnderCa

Inlet

Pressure

Tap1/8NPT

HONEYWELL

©o Outlet

Pressure

Tap

1/8NPT

OUTLET

25-24-98a

Manifold Gas Pressure Adjustment 2. Turn gas ON. Operate the furnace by using a jumper wire on

the Rto W thermostat connection on the control.

NOTE: Make adjustment to manifold pressure with burners oper- 3. Remove manifold pressure adjustment screw cover on fur-

atin .nace as control valve. Turn ad_screw counterclock-

44101 261302