Specification Sheet

Features:

• Includes diagnostic indicator flash codes

• 3 fan speeds

• Remote flame sense

• Humidifier and electronic air cleaner connections (optional)

Integrated Furnace

Control – 21D83M-843

Single-Stage/HSI Integrated

Furnace Control Kit

21D83M-843

Nitride Ignition

Integrated Furnace Control

Controls Gas Valve, Ignitor, Blower, Inducer,

Humidifier and Air Cleaner. Replaces Lennox models.

Kit includes:

1 – 50A66-843 Ignition Control Board

1 – Wiring harness (9-pin to 12-pin)

1 – Wiring harness (4-pin to 6-pin)

1 – Mounting panel

4 – Stand-off fasteners

1 – Circuit breaker

1 – 4" blue wire

2 – Wiring diagrams

Replace

the Original

with the Original.

21D83M-843 simplifies installation and ensures

peak system performance.

OEM Replacement

PAGE 1
Single-Stage/HSI Integrated Furnace Control Kit OEM Replacement 21D83M-843 Nitride Ignition Integrated Furnace Control Controls Gas Valve, Ignitor, Blower, Inducer, Humidifier and Air Cleaner. Replaces Lennox models. Kit includes: 1 – 50A66-843 Ignition Control Board 1 – Wiring harness (9-pin to 12-pin) 1 – Wiring harness (4-pin to 6-pin) 1 – Mounting panel 4 – Stand-off fasteners 1 – Circuit breaker 1 – 4" blue wire 2 – Wiring diagrams Replace the Original with the Original.
PAGE 2
Single-Stage HSI Integrated Furnace Control Kit OEM Replacement 21D83M-843 Nitride Ignition Integrated Furnace Control Controls Gas Valve, Ignitor, Blower, Inducer, Humidifier and Air Cleaner. Replaces Lennox models. Specifications TYPICAL SYSTEM WIRING DIAGRAM Input Voltage: 25 VAC 50 / 60 Hz Maximum Input Current @ 25 VAC: 0.45 amp HOT (LINE) 24 VAC CLASS II TRANSFORMER Valve Relay: 1.5 amp @ 25 VAC 50 / 60 Hz 0.6 pf Ignitor Relay: 2.