publication

Wiring adapters included

for old style block and new

style in-line harnesses

50M56U-751 Replaces:

Carrier

White-Rodgers

325878-751

50M56-751

HK42FZ004

HK42FZ007

HK42FZ008

HK42FZ009

ICM

HK42FZ011

ICM282A

HK42FZ013

HK42FZ016

HK42FZ034

CARRIER

INTEGRATED HSI MODULE

DIRECT

REPLACEMENT

50M56U-751

CROSS REFERENCE

Model

Number

Pre-Purge

Time

Heat Delay-

To-Fan-On

Heat Delay-

To-Fan-Off

Cool Delay-

To-Fan-On

Cool Delay-

To-Fan-Off

Post

Purge

50M56U-751

30 sec

25 / 60

90 / 120

5 / 90

25 sec

50M56U-751 CARRIER SINGLE STAGE INTEGRATED

HSI FURNACE CONTROL KIT

Replaces White-Rodgers 50M56-751 and Virtually All Carrier Single

Stage HSI Controls with 120V Ignitors. Controls Gas Valve, Ignitor,

Blower, Inducer, Humidifier (Both 120V & 24V), and Air Cleaner

FEATURES

• System Diagnostic LED with fault recall.

• Fused to protect low voltage system transformers.

• Low-speed continuous fan option.

• Self-test installation routine.

SPECIFICATIONS

Operating Temperature . . . . . . . . . -40 to 176°F (-40 to 80°C)

Humidity Range . . . . . . . . . . . . 5% to 93% RH (non-condensing)

Mounting . . . . . . . . . . . . . . . Surface mount multipoise

Electrical Ratings @ 77°F (25°C)

Input Voltage . . . . . . . . . . . . . 25 VAC 50 / 60 Hz

Maximum Input Current @ 25 VAC . . . . . 0.45 amp

Relay Load Ratings

Valve Relay . . . . . . . . . . . . . . 1.5 amp @ 25 VAC 50 / 60 Hz 0.6 pf

Ignitor Relay . . . . . . . . . . . . . 6.0 amp @ 120 VAC 50 / 60 Hz

(resistive)

Inducer Relay . . . . . . . . . . . . . 2.2 FLA-3.5 LRA @ 120 VAC

Circulator Relay . . . . . . . . . . . . 14.5 FLA-25.0 LRA @ 120 VAC

Flame Current Requirements

Minimum current to insure flame detection . . 1 uA DC*

Maximum current for non-detection . . . . . 0.10 uA DC*

Maximum allowable leakage resistance . . . 100 M ohms

*Measured with DC microammeter in the flame probe lead

Timing Spec (@ 60 Hz) maximum

Flame establishing time . . . . . . . . . 0.8 sec

Flame failure response time . . . . . . . 2.0 seconds

NOTE

: At 50 Hz, all timing specifications should be increased by 20%.

New

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