Fresh Indoor Air Quality
INSTALLER: PLEASE FILL OUT AND MAIL GUARANT EE C AR D AFTER INSTALLATION
IS COMPLETE. LEAVE INSTALLAT IO N IN ST RUCTIONS WITH HOME OWNER
PRECAUTION: The installer should be an experienced service technician. Disconnect electrical power before
beginning installation. Do not install where temperatures fall below 32 degrees F or where plenum temperatures
exceed 200 degrees F. For maximum evaporative capacity, install this humidifier on the warm air supply plenum.
When wiring into a multi-speed blower circuit see Step 6C & 6D.
ADDITIONAL MATERIALS THAT MAY BE NECESSARY:
1
ALLOW 2 1/2 INCHES CLEARANCE
ABOVE THIS SURFACE FOR SERVICING
Top Of Template
TEMPLATE FOR INSTALLING
POWER HUMIDIFIER
FOLLOW INSTRUCTIONS PACKED WITH HUMIDIFIER
1. REMOVE PROTECTIVE PAPER FROM BACK OF TEMPLATE AND STICK IN LEVEL POSITION.
2. CENTER PUNCH AND DRILL THE FOUR SIDE MOUNTING HOLES WITH A 1/8 " DIA. DRILL.
3. HANG HUMIDIFIER FROM FOUR SIDE SCREWS AND INSTALL DRAIN PAN, EVAPORATOR
PAD AND DISTRIBUTOR TROUGH.
WHEN INSTALLING ON BASEMENT TYPE FURNACE, EXTEND THIS LINE
FOR LOCATING HOLE ON ADJACENT PLENUM
4. TIGHTEN SCREWS AND ADJUST HUMIDIFIER UNTIL LEVEL.
5. REMARK FOUR REMAINING HOLES IF NECESSARY.
6. REMOVE HUMIDIFIER, DRILL REMAINING HOLES AND CUT OUT CENTER SECTION OF
TEMPLATE.
CUT ON THIS LINE
IF FURNACE JACKET EXTENDS MORE THAN 3" OUTWARD FROM THE PLENUM SURFACE
ALLOW 4" CLEARANCE BELOW THIS LINE FOR EASY ACCESS TO DRAIN HOSE CONNECTION.
TEMPLATE NO. 1137
1. 1/4" diameter plastic supply tubing or 1/4" copper supply tubing for hot water applications
2. air pressure switch (G.F. Model #12500 suggested)
3. current sensing relay (G.F. Model #GA50 suggested)
4. junction box, 115 V. grounding outlet, cover and wire
2
1137 SERIES
FLOW THROUGH
POWER HUMIDIFIER
FOR INSTALLATION ON A VERTICAL
SURFACE OF THE WARM AIR PLENUM
OF ANY FORCED AIR FURNACE
Select location on vertical surface of warm air plenum for mounting
humidifier. Stick mounting template in place making sure the template is
level. Do not install humidifier where the blanked off ends of a cooling coil
will restrict air flow to the humidifier.
COPPER
TUBING
3
PLASTIC
TUBING
Mount the self tapping saddle valve on either a cold or a hot water pipe.
A side or top mount is best to avoid clogging from pipe sediment.
Connect 1/4” O.D. tubing to the saddle valve. Copper tubing requires a
brass compression nut and brass sleeve. Plastic tubing requires a brass
insert inside the tubing, a plastic sleeve on the outside with a brass
compression nut.
NOTE: DO NOT USE PLASTIC TUBING ON HOT W ATER OR IN
CON TAC T WIT H ANY H OT PLENU M SURFAC E OR DUCT.
INSTALLATION OF THIS SADDLE VALVE MUST MEET OR EXCEED
LOCAL CODES AND ORDINANCES.
4
Assemble distributor tube so that it is directed into the center opening of the
distributor trough cover. Connect 1/4" water supply tube to brass filter at
inlet of solenoid.
WITH ANY HOT PLENUM SURFACE OR DUCT. IF USING
PLASTIC TUBING, USE TUBE SUPPORT PROVIDED.
DO NOT USE PLASTIC TUBING IN CONTACT
Cut out center section. Install one cabinet retaining clip in each of
two top holes to assist holding cabinet while installing six cabinet
screws. Install drain pan, evaporator pad and distributor trough using
thumb nuts provided.
SADDLE VALVE INSTALLATION INSTRUCTIONS
Copper Pipe
1. Retract piercing pin into valve body by turning handle
counterclockwise.
2. Screw valve body into upper bracket and tighten.
3. Place rubber gasket over piercing pin.
4. Assemble saddle valve over copper pipe using enclosed screws,
nuts and lower bracket.
5. Tighten screws evenly and firmly. Brackets should be parallel.
6. Complete compression connection to saddle valve outlet.
7. Turn handle clockwise to pierce tubing and close saddle valve.
8. Turn handle counterclockwise to open saddle valve, leave open for
several seconds to flush dirt from pipe and tubing.
Steel, Brass or Hard Plastic Pipe
1. Shut off water supply and drain pipe.
2. Turn handle clockwise to expose piercing pin and close saddle
valve.
3. Place rubber gasket over piercing pin.
4. Drill 1/8" hole in pipe using a hand crank drill to avoid shock hazard.
5. Assemble saddle valve over steel, brass or hard plastic pipe using
enclosed screws, nuts and lower bracket.
6. Tighten screws evenly and firmly. Brackets should be parallel.
7. Complete compression connection to saddle valve outlet.
8. Turn handle counterclockwise to open saddle valve, leave open for
several seconds to flush dirt from pipe and tubing.
Threaded Pipe Fittings
1. Turn handle clockwise to expose piercing pin and close saddle
valve.
2. Seal valve body threads using pipe tape or sealant.
3. Install valve into 1/8" NPT fitting.
4. Complete compression connection to saddle valve outlet.
5. Turn handle counterclockwise to open saddle valve, leave open for
several seconds to flush dirt from pipe and tubing.
P-103 COMPRESSION NUT
P-104 COMPRESSION SLEEVE
P-111 CONNECTOR
1137-38 CABINET ASSEMBLY
PARTS LIST FOR HUMIDIFIER
1137-2 FAN SHROUD
1137-9 FAN BLADE
1137-20 FAN GUARD
1137-24 DISTRIBUTOR TUBE
1099-9 THUMB NUT
1137-35 TROUGH COVER
1137-4 DISTRIBUTOR TROUGH
990-13 EVAPORATOR PAD
SOLENOID VALVE
ASS'Y 990-53
1137-7 WIRING BRACKET
40-7 TINNERMAN NUT
1137-8 MOTOR
1137-50 COOLING FAN
GA4238 RELAY ASS'Y (FORMERLY 1137-26)
1137-39 FRONT COVER
ASS'Y
990-37-76 ORIFICE & STRAINER
ASSEMBLY
990-16-76 ORIFICE FITTING
990-17 STRAINER SCREEN
990-18 STRAINER BODY
1137-31 POWER SUPPLY CORD
1137-3 DRAIN PAN
P-163 HOSE CLAMP
1099-16 DRAIN TUBE
FORM NO. 1137-47 REV. H (FILE 12625)
Litho in U.S.A.
5
6
M SERIES HUMIDISTAT
OR OTHER MANUAL HUMIDISTAT
HUMIDIFIER CONTROL LEADS (YELLOW WIRES)
CONNECT TO HUMIDISTAT.
24V OUTPUT FROM HUMIDIFIER (RED WIRES)
NOT USED, SEPARATE OR CAP INDIVIDUALLY
115v.
60CY.
115v.
60CY.
6A
6C
ACC
EAC
(HOT)
C
L1
(HOT)
L2
ON-OFF
SWITCH
ON-OFF
SWITCH
12500 AIR
PRESSURE
SWITCH
NO
C
HUMIDIFIER
120v. OUTLET
HUMIDIFIER
120v. OUTLET
GRD
GRD
115v.
60CY.
SNSR
HUM
AC N
AC L
L1
(HOT)
L2
6B
6D
AC N
AC L
FAN CONTROL
ON-OFF
SWITCH
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
L1
115v.
(HOT)
60CY.
L2
E SERIES HUMIDISTAT
(not included)
SNSR
HUM
OUTDOOR TEMP. SENSOR
(NOT USED IN MANUAL MODE)
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
24V OUTPUT FROM HUMIDIFIER (RED WIRES) OR
727-58 24 V. TRANSFORMER SWITCHED WITH FURNACE OR
OR 24 VAC POWER SUPPLY SWITCHED WITH FURNACE.
SINGLE SPEED
BLOWER MOTOR
HUMIDIFIER
120v. OUTLET
ON-OFF
SWITCH
GA50 CURRENT
SENSING RELAY
COMMON LEAD
GRD
C
HI
LO
120v. OUTLET
GRD
MULTI
SPEED
BLOWER
MOTOR
HUMIDIFIER
INSTRUCTIONS FOR WIRING HUMIDIFIER
CHEC K WITH LOCAL AUTH ORITIES 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.
7
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.
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
8
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
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.
LIMITED WARRANTY
This humidifier, if properly registered by the return of the warranty registration card to the manufacturer, is warranted to the consumer against defects in
materials and workmanship for a period of five years from the date of installation. Evaporator pads, water strainers or metering orifices are not covered
by this limited warranty or any other warranties. Any other defective parts will be repaired without charge except for removal, reinstallation and
transportation costs. To obtain repair service under this limited warranty, the consumer must send the defective part or the complete humidifier to the
manufacturer.
THERE ARE NO EXPRESS WARRANTIES COVERING THIS HUMIDIFIER OTHER THAN AS SET FORTH ABOVE, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY EXCLUDED. THE MANUFACTURER ASSUMES NO
LIABILITY IN CONNECTION WITH THE INSTALLATION OR USE OF THIS PRODUCT, EXCEPT AS STATED IN THIS LIMITED WARRANTY. THE
MANUFACTURER WILL IN NO EVENT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES.
This limited warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Some states do not allow either
limitations on implied warranties, or exclusions from incidental or consequential damages, so the above exclusion and limitation may not apply to you.
Any questions pertaining to this limited warranty should be addressed to the manufacturer. (U.S.A.: The manufacturer has elected not to make available
the informal dispute settlement mechanism which is specified in the Magnuson-Moss Warranty Act.)
GENERAL FILTERS, INC.
NOVI, MICHIGAN 48375-1115
WWW.GENERALAIRE.COM
CANADIAN GENERAL FILTERS, LTD.
SCARBOROUGH, ONTARIO M1R3B7
WWW.CGFPRODUCTS.COM
CARE AND MAINTENANCE
Your Humidifier is engineered to give helpful and trouble-free humidification. For maximum efficiency the following cleaning procedures should be carried
out at the end of each heating season:
1. Turn off water supply and electrical power to humidifier.
2. Remove water distributor tube, distributor trough, evaporator pad and drain pan. The evaporator pad may be
removed from either the top or bottom of the humidifier. Clean excessive mineral deposits from the distributor trough,
cover, drain pan and humidifier cabinet. A solution of 1/2 vinegar & 1/2 water will help loosen mineral deposits.
3. If the evaporator pad has excessive mineral deposits, replace with a new “990-13” evaporator pad. Install trough
and drain pan. Replace cover and the distributor tube to proper position over the distributor trough.
4. In heavy mineral areas or if the solenoid valve fails to function disconnect the 1/4” water supply line from the
solenoid valve. Remove the brass strainer body (P.N. 990-18) from the solenoid valve. Carefully pull the strainer
screen (P.N. 990-17) from the orifice fitting (P.N. 990-16). Clean the mineral deposits from all parts. If the orifice is
clogged, it may be opened by inserting a small needle. Reinsert the filter into the orifice fitting and screw the brass
strainer body into the solenoid valve.
5. Reconnect the 1/4” water line to the solenoid valve if necessary. Turn on the water supply and check all points for
leakage. The operation of the unit may be checked by starting the furnace. The humidifier operates only when the
furnace blower is running or the burner circuit is energized. The humidifier is now ready for operation.
6. During the summer, turn off water supply and electrical power to humidifier.
AT
OUTSIDE
TEMPERATURE
RECOMMENDED
SETTING
-20°F -29°C 15%
-10°F -23°C 20%
0°F -18°C 25%
+10°F -29°C
+20°F - 7°C
30%
35%
+30°F - 1°C 40%
HOW THE HUMIDIFIER WORKS
The operating principle of the humidifier is based on the most efficient
and economical means of evaporating water to the air. The heat
necessary for evaporating water is produced by the furnace.
The water supply to the humidifier is controlled by the electric solenoid
valve. The solenoid valve and humidifier fan are controlled by a
humidistat connected through an isolation relay. The humidistat is
designed for wall mounting in the living area or surface mounting on the
return air duct. ELECTRICAL RATING: 24 VAC/ 60 Hz.
DO NOT SET RELATIVE HUMIDITY TOO HIGH DURING COLD
WEATHER. EXCESSIVE HUMIDITY MAY CAUSE CONDENSATION
ON WINDOWS OR IN WALLS. REFER TO RECOMMENDED
SETTINGS AS DESCRIBED IN THE HUMIDISTAT OWNERS
MANUAL.
Water flows through a strainer, is metered through an orifice to provide
the proper amount of water, and is supplied to the evaporator pad by
the distributor trough. Air from the warm air plenum is pulled through
the wetted evaporator pad by the humidifier fan and returned to the
warm air plenum to be circulated through the living area. Moisture is
evaporated to the air passing through the evaporator pad.
Minerals are not blown into the air stream as occurs in atomizing
humidifiers; they are left on the evaporator pad where a high
percentage is carried off with the waste water.
When the humidifier is installed and operating, no adjustments are
necessary other than setting the control knob on the humidistat to the
desired level of humidification.
To turn the humidifier off, close water supply valve, switch electrical
power off and turn humidistat off.
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