Sears N8MPL050B12B1 - Manual (Page 27)

Duct Design and Duct Installation Requirements
See Section 10.
Internal Filter in Top Return Installation
When installing 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 filterintoside clips firstand push filter back until
it is fully engaged into back clip.
NOTE: If filters are only suitable for heating application, ad­
vise homeownerthat 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.
WARNING
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
ating^_________________________________________________
WARNING
FIRE OR EXPLOSION HAZARD.
Failure to turn OFF gas at shut off before connecting
manometer could result in death, persona! 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.
2. Turn gas ON. Operate the furnace by using ajumper wire on
the R to W thermostat connection on the control.
3. Remove manifold pressure adjustment screw cover on fur­
nace gas control valve. Turn adjusting screw counterclock-
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