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

j_

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

Clip

See Section 10.

side-to-side

 

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.

Gas Supply 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 Kit instruction manual for furnaces con- verted to LP gas.)

Manifold Gas Pressure Adjustment

NOTE: Make adjustment to manifold pressure with burners oper-

atin .

441 01 261302

FIRE OR EXPLOSION HAZARD.

Failure to turn OFF gas at shut 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 to manifold 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

 

 

Under Ca

HONEYWELL

Outlet

 

 

Pressure

 

 

©o

/

 

Tap

 

1/8NPT

 

OUTLET

Inlet

 

Pressure

 

Tap 1/8NPT

 

 

25-24-98a

2.Turn gas ON. Operate the furnace by using a jumper wire on the R to W thermostat connection on the control.

3.Remove manifold pressure adjustment screw cover on fur-

nace

as control valve. Turn ad_screw

counterclock-

Page 27
Image 27
Sears 8MPN100J20B1, N8MPN075F16B1, N8MPL100F20B1 Checks and Adjustments, Startup, Manifold Gas Pressure Adjustment

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