
37
24 V
Coil
To Humidifier Leads
To Com/24V Screw Terminal
on Thermostat Strip
To HUM Terminal On
Furnace Control Board
To Humidifier Leads
A11157
Fig. 36 -- Field--supplied Isolation Relay for Humidifiers with Internal Power Supply
W/W1
W2
COM
Y/Y2
R
G
A11401
Fig. 37 -- Typical Two--Stage Field Wiring Diagram
TEST / TWIN
HUM
PL
T
SEC-2
SEC-1
COM
24VAC
PL1
W2 Y
DHUM G COM W/W1 Y/Y2 R
24V
FUSE 3-AMP
EAC-2
EAC-1
L1
BL-1
PR-1
L2
COM
HI HT
COOL
LO HT
SPARE 2
24V MTR
TA
P
S
BLOWER SPEED
TERMINALS
115-VAC (L2)
NEUTRAL
CONNECTIONS
LED OPERATION
& DIAGNOSTIC LIGHT
3-AMP FUSE
24-V THERMOSTAT
TERMINALS
SET UP SWITCHES
LOW HEAT ONLY
AND BLOWER
OFF-DELAY
TWINNING AND/OR
COMPONENT TEST
TERMINAL
ACRDJ - AIR CONDITIONING
RELAY DISABLE JUMPER
HUMIDIFIER TERMINAL
(24 VAC 0.5 AMPS MAX)
TRANSFORMER
24 VAC CONNECTIONS
PL1-LOW VO LTAGE
MAIN HARNESS CONNEC TOR
PL2 - HOT SURFACE
IGNITER/INDUCE R
MOTOR CONNECTION
115 VAC
BLOWER POWER (BL1)
CONNECTION
115 VAC LINE (L1)
INPUT
LHT
OFF
DLY
ON
OFF
1 2 3
IDR
HSIR
IDM
IHI/L
OR
PL2
1
HSI HI LO
1
EAC TERMINAL
115 VAC 1.0 AMP MAX
115 VAC
TRANSFORMER
PRIMARY
SPARE 1
A11150
Fig. 38 -- Example of Two--Stage Furnace Control
PG95X
AT