Electrical Connections

115V.60Hz.

Gr_nd

Thermostat

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Low Voltage

Terminal Board

NOTE: 115 VAC/6OHz/single-phase

Operating voltage range*: 127 VAC max, 104 VAC min.

* Permissible limits of voltage at which unit will operate satisfactorily

Furnace Control

The furnace control is preset at the factory with ON delay of 30 sec- onds in the heating mode. The blower OFF timing is preset at 140 seconds. If desired, the fan OFF delay can be reset to obtain the

longest delay times while still maintaining comfort levels. See "Furnace Wiring Diagram".

Furnace Control Fuse

The 24V circuit contains a 5-amp, automotive-type fuse located on furnace control. (See Figure 20) Any electrical shorts of 24V wiring during installation, service, or maintenance may cause fuse to blow. If fuse replacement is required, use only a fuse of identical size (5 amp.).

ControlConnections

Jumper24v c4> /.___ __ DiagnosticLight

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10.Ductwork and Filter (Upflow/Horizontal)

CARBON MONOXIDE POISONING HAZARD.

Failure to properly seal duct could result in death or personal injury.

Do NOT draw return air from inside a closet or utility

room where furnace is located. Return air duct

MUST be sealed to furnace casing.

Duct Connections

This furnace may be installed in only a bottom or side return-air

duct application. Return air duct connections through the back of the furnace is NOT permitted.

Upflow ONLY: Side return-air duct connections can be made by cutting out the embossed area shown in Figure 21. A plugged hole is provided at each furnace side duct location to help start cut- ting the opening. Side duct connections are NOT permitted in hori- zontal flow applications.

Upflow and Horizontal Flow: Bottom return-air duct connec- tions can be made by removing the knockout panel in the furnace base. Do NOT remove knock-out except for a bottom return-air duct connection.

Cutting Side Return Air Opening

Plugged ,,Starting

0 /_/'I'I / Hole

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Duct Design

Design and install air distribution system to comply with Air Condi- tioning Contractors of America manuals or other approved meth- ods that conform to local codes and good trade practices.

When the furnace is located in an area near or adjacent to the living area, the system should be carefully designed with returns to mini-

mize noise transmission through the return air grille. Any blower moving a high volume of air will produce audible noise, which could

be objectionable when the furnace is located very close to a living

_]

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Sears 8MPL100F20B1, N8MPN075F16B1 Ductwork and Filter Upflow/Horizontal, Furnace Control Fuse, Duct Design

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