INSTALLATION INSTRUCTIONS
Gas Furnace: (F/G)9MVE
34
440 01 4400 03
Specifications subject to change without notice.
Figure 39
Isolation Relay for Humidifiers with Internal Power Supply
24 V
Coil
To Humidifier Leads
To Com/24V Screw Terminal
on Thermostat Strip
To HUM 24 VAC Terminal
On Furnace Control Board
To Humidifier Leads
A11157
Figure 40
Example of Variable Speed Furnace Control for ECM Blower Motor
24
ï
V THERMOSTAT
PL2
ï
HOT SURFACE
IGNITER & INDUCER
MOTOR CONNECTOR
115
ï
VAC (L2) NEUTRAL
CONNECTIONS
115
ï
VAC (L1) LINE
VOLTAGE CONNECTIONS
EAC
ï
1 TERMINAL
(115
ï
VAC 1.0 AMP MAX.)
PL1
ï
LOW VOLTAGE MAIN
HARNESS CONNECTOR
TERMINALS
HARNESS CONNECTOR
TRANSFORMER 24
ï
VAC
CONNECTIONS
3
ï
AMP FUSE
STATUS AND COMM
LED LIGHTS
SW1 SETUP
SWITCHES AND
AND ECM BLOWER
DELAY
MODEL PLUG
CONNECTOR
AIR CONDITIONING
(A/C) AIRFLOW
SETUP SWITCHES
COMMUNICATION
CONNECTOR
CONTINUOUS FAN
BLOWER OFF
ï
F) AIRFLOW
SETUP SWITCHES
OUTDOOR
(C
IR TEMP
CONNECTOR
HUMIDIFIER
TERMINAL (24
A
VAC
0.5 AMP MAX.
FLASH
UPGRADE
CONNECTOR
(FACTORY
ONLY)
SW4 SETUP
ï
SOFTWARE
VERSION
PART NUMBER AND
DATE CODE WWYY
SWITCHES
L11F081