Carrier 59MN7A Troubleshooting Guide download pdf (Page 39)

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APPENDIX A

BOARD LAYOUT AND WIRING SCHEMATICS

Fig. 1 – Modulating Furnace Control



24-V THERMOSTAT

TERMINALS

PL2 – HOT SURFACE

IGNITER & INDUCER

MOTOR CONNECTOR

115-VAC (L2)

CONNECTIONS

115-VAC (L1) LINE

VOLTAGE CONNECTIONS

EAC-1 TERMINAL

(

1.0 AMP MAX.

)

PL1 – LOW VOLTAGE MAIN

HARNESS CONNECTOR

PL3 – ECM BLOWER

HARNESS

CONNECTOR

TRANSFORMER 24-VAC

CONNECTIONS

3-AMP FUSE

STATUS AND COMM

LED LIGHTS

SW1 SETUP

SWITCHES AND

BLOWER OFF-

DELAY

MODEL PLUG

CONNECTOR

AIR CONDITIONING

(A/C) AIRFLOW

SETUP SWITCHES

COMMUNICATION

CONNECTOR

CONTINUOUS FAN

(CF) AIRFLOW

SETUP SWITCHES

OUTDOOR

AIR TEMP

CONNECTOR

HUMIDIFIER

TERMINAL (24-VAC

0.5 AMP MAX.

ACRDJ – AIR

CONDITIONING

RELAY DISABLE

JUMPE

R

FLASH

UPGRADE

CONNECTOR

(FACTORY

ONLY)

SW4 SETUP

SWITCHES

SOFTWARE

VERSION

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