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5
E2 HUMIDISTAT
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
24V OUTPUT FROM HUMIDIFIER (RED WIRES) OR
727-58 24 V. TRANSFORMER SWITCHED WITH FURNACE
OR 24 VAC POWER SUPPLY SWITCHED WITH FURNACE.
6A
6
ON-OFF
ACC
SWITCH
EAC
115v.
(HOT)
60CY.
C
6C
ON-OFF
SWITCH
L1
(HOT)
115v.
60CY.
L2
INSTRUCTIONS FOR WIRING HUMIDIFIER
FIG. 6A WITH FURNACE CIRCUIT BOARD
On furnaces with output terminals ACC, or EAC check output
voltage to determine that terminals are 115V. Connect on-off
switch in series with the hot wire.
NOTE: ALL WIRING SHOULD COMPLY WITH LOCAL
ELECTRICAL CODES.
7
Replace evaporator pad assembly and humidifier cover. Insert low
voltage six connector wiring harness from cover into chassis solenoid
harness.
OUTDOOR TEMP. SENSOR
(NOT USED IN MANUAL MODE)
HUMIDIFIER
120v. OUTLET
12500 AIR
PRESSURE
HUMIDIFIER
SWITCH
120v. OUTLET
NO
C
FAN CONTROL
L1
(HOT)
115v.
60CY.
L2
ON-OFF
6B
SWITCH
GRD
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
SNSR
HUM
AC N
AC L
L1
6D
115v.
(HOT)
GRD
60CY.
L2
FIG. 6B WITH SINGLE SPEED BLOWER MOTOR
On furnaces with single speed blowers, mount a junction box and 115v.
grounded outlet connected in parallel with the blower circuit. Connect the
on-off switch in series with the hot or black wire.
FIG. 6C WITH TWO SPEED BLOWER MOTOR
On furnaces with a two speed blower, the humidifier and a Model 12500
Air Pressure Switch may be wired from a continuous 115 volt power
source. Install the on/off switch and Air Pressure Switch in series with the
hot or black wire. The Air Pressure Switch will detect furnace operation
and supply power to the humidifier accordingly.
FIG. 6D WITH TWO SPEED BLOWER MOTOR
8
On furnaces with a two speed blower, the humidifier may be wired from a
continuous 115 volt power source. Install the on/off switch in series with
the hot or black wire. Install the GA50 Current Sensing Relay in series
with the humidistat circuit. The Current Sensing Relay will detect furnace
operation and supply power to the humidifier accordingly.
CIRCUIT DESCRIPTION
The humidifier is connected to the 120 volt AC circuit through a control
relay. The secondary coil of an isolation transformer, a diode and resistor
supply 24 volts DC for the control circuit which also includes the humidistat
and relay coil. When the control circuit is completed by the humidistat, the
relay closes, supplying 120 volts to the fan motor and 24 volts to the
solenoid valve.
8
Turn on water supply and plug in power cord to check operation of
humidifier. Set humidistat to a demand setting. With the furnace off, the
solenoid valve should be closed and the humidifier fan not running. Start
the furnace, the solenoid valve should open and the humidifier fan run
when the blower or burner circuit is energized. Check flow of water
through distributor trough and evaporator pad. The standard GA4231
yellow orifice will supply approximately 3.5 GPH of water at a line water
pressure of 60 psi. For low water pressures (20-40 psi) a larger orifice
GA4299 is available to provide the same flow. Leave humidistat set at the
recommended setting.
1. Follow the installation instructions
supplied with the humidistat.
2. To remove the humidistat from the
base, squeeze the louvered base at
the top and bottom.
3.
Before wall mounting, please
remove the gasket.
�
4. Before return air duct mounting,
please remove the breakout piece.
SINGLE SPEED
BLOWER MOTOR
GA50 CURRENT
COMMON LEAD
SENSING RELAY
ON-OFF
SWITCH
HUMIDIFIER
120v. OUTLET
GRD
C
MULTI
SPEED
HI
BLOWER
MOTOR
LO
HUMIDIFIER
120v. OUTLET
GRD
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