GeneralAire 1137 SERIES Legacy - Manual (Page 3)

Connect drain hose to 5/8" spout on humidifier cabinet using hose
clamp provided. Run 5/8" hose to suitable drain such as floor drain,
sewer or laundry sink. Be sure hose has continuous slope and is not
kinked at any point.
7
24V OUTPUT FROM HUMIDIFIER (RED WIRES) OR
727-58 24 V. TRANSFORMER SWITCHED WITH FURNACE OR
OR 24 VAC POWER SUPPLY SWITCHED WITH FURNACE.
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
OUTDOOR TEMP. SENSOR
(NOT USED IN MANUAL MODE)
A
C
L
A
C
N
H
U
M
SN
SR
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
990-16-76 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 990-16-75 is available to provide the same flow. Leave humidistat
set at the recommended setting.
8
INSTRUCTIONS FOR WIRING HUMIDIFIER
CHECK WITH LOCAL AUTHORITIES FOR
COMPLIANCE.
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.
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
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.
5
E SERIES HUMIDISTAT
(not included)
8
AC L
AC N
HUM
SNSR
L1
(HOT)
L2
115v.
60CY.
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
FAN CONTROL
ON-OFF
SWITCH
SINGLE SPEED
BLOWER MOTOR
ACC
EAC
(HOT)
C
115v.
60CY.
ON-OFF
SWITCH
6A
6C
6B
GRD
HUMIDIFIER
120v. OUTLET
HUMIDIFIER
COMMON LEAD
120v. OUTLET
C
HI
LO
GA50 CURRENT
SENSING RELAY MULTI
SPEED
BLOWER
MOTOR
6D
12500 AIR
PRESSURE
SWITCH
NO
C
L1
(HOT)
L2
115v.
60CY.
ON-OFF
SWITCH
GRD
HUMIDIFIER
120v. OUTLET
L1
(HOT)
L2
115v.
60CY.
ON-OFF
SWITCH
GRD
HUMIDIFIER
120v. OUTLET
GRD
6
24V OUTPUT FROM HUMIDIFIER (RED WIRES)
NOT USED, SEPARATE OR CAP INDIVIDUALLY
HUMIDIFIER CONTROL LEADS (YELLOW WIRES)
CONNECT TO HUMIDISTAT.
M SERIES HUMIDISTAT
OR OTHER MANUAL HUMIDISTAT