Honeywell S9240F2051, Installation Instructions Manual

S9240F2051 MODULATING INTEGRATED FURNACE CONTROL

3

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WARNING

Fire or Explosion Hazard.

Can cause severe injury, death or property 

damage.

1. The integrated furnace control can malfunction if it 

gets wet, leading to accumulation of explosive gas.

— Never install where water can flood, drip or 

condense on the IFC.

— Never try to use an integrated furnace control 

that has been wet—replace it.

2. Liquefied petroleum (LP) gas is heavier than air 

and will not naturally vent upward.

— Do not operate electric switches, lights, or 

appliances until you are sure the appliance area 

is free of gas.

WARNING

Electrical Shock Hazard.

Can cause severe injury, death or property 

damage.

Disconnect power supply before beginning wiring or 

making wiring connections to prevent electrical shock 

or equipment damage.

CAUTION

Equipment Damage Hazard.

Water can cause equipment damage or 

malfunction.

If the integrated furnace control must be mounted near 

water or moisture, provide suitable waterproof 

enclosure.

Location

The integrated furnace control is mounted on a panel within 

the circulator compartment of the furnace. The location must 

provide:

— Access to the field wiring terminals.

— Operating ambient temperatures between -40°F and 175°F 

(-40°C and 79°C).

— Relative humidity below 95% non condensing.

— Protection from water, steam or corrosive chemicals that 

are used to clean the appliance.

— Protection from dripping water, such as from an overfilled 

humidifier or from condensation.

— Protection from dust or grease accumulation.

Mounting

The integrated furnace control is designed to snap into the 

appliance mounting panel.

1.

While holding the controller board with the thermostat 

terminals (E7) at the bottom, insert the two left-side 

hooks on the board into the holes in the mounting panel. 

See Fig. 1 on page 5.

2.

Press the board into the mounting panel’s right-side 

holes until it snaps into place.

Wiring

if available, check the wiring diagrams furnished by the 

appliance manufacturer for circuits differing from the general 

hookup shown. Carefully follow any special instructions 

affecting the general procedures outlined below.

All wiring must comply with local codes and ordinances.

See Table 1, Table 2, Table 3, and Fig. 1 beginning on page 3 

for typical connections, but refer to furnace manufacturer 

instructions, if available.

See Fig. 2 on page 6 for a typical wiring diagram.

Table 1. Wiring Connections - Class 2 - Low Voltage.

Terminal Type

Connection/Label

Board label

(see Fig. 1)

Connects S9240F to:

12-position screw terminal block

(#5 screw)

W1

E7

Thermostat 1st stage heat input

W2

Thermostat 2nd stage heat input

G

Thermostat continuous fan input

Y2

Thermostat 2nd stage cool input

Y1

Thermostat 1st stage cool input

C

24 Volt ground (connected to transformer and 

chassis ground)

R

24  Volt  hot

DH

Not used

H (optional)

If used: 24V humidifier output

L (optional)

If used: Lennox System Operating Monitor 

(LSOM) output; LSOM provides diagnostics for 

outdoor heat pump or A/C unit.

O (optional)

If used: Thermostat signal to heat pump 

reversing valve input

DS (optional)

If used: Thermostat Dehumidification