GeneralAire GF-1137L Operating instructions

Model GF-1137L
Installation & Owners Manual
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Model 1137 Humidier Installation Manual
Page #
3
3
3
3
4
4
5
5-6
7
7
8
8
9
10
11
Subject
Specications
Unit Location
Additional Materials That May Be Necessary
Installation
Installation Cont.
Saddle Valve / Solenoid Valve Installation
Installation Cont.
Installing / Wiring The Control
Installation Cont.
How the Humidier Works
Maintenance
Parts Drawing
Trouble Shooting
FAQ’s
Warranty Registration
1137 Table of Contents
WARNING!
This symbol indicates: IMPORTANT INSTRUCTIONS!
Failure to heed them can result in serious injury or death.
CAUTION!
This symbol indicates: IMPORTANT INSTRUCTIONS!
Failure to heed them can result in serious injury or material property damage.

!

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IMPORTANT INSTALLATION INSTRUCTIONS
GF-1137L model fan-power humidifier has a built-in transformer.
A 24V SPST (Single-Pole Single-Throw) relay is field supplied by contractor
and required for model 1137L installation.
•DO NOT connect yellow wires to furnace board.
•DO NOT use red wires in installation.
•ONLY connect yellow wires as follows:
-Load side of 24V relay (C) to (C) on GF-MHX3 Humidistat.
-Load side of 24V relay (NO) wired with yellow wire on humidifier. Then
connect, the other yellow wire on humidifier to (NO) on Humidistat to
complete the circuit.
- Coil side of relay wired to C/W for heat call at Control board of furnace

Model 1137 Humidier Installation Manual
Unit Location
• WARNING: Disconnect electrical power before beginning installation.
•Do not install where temperatures fall below 32° F or where plenum temperatures exceed 200° F. When wiring
into a multi-speed blower circuit see Step 7D.
•INSTALLATION: For maximum evaporative capacity, install this humidier on the warm air supply plenum.
When wiring into a two-speed blower circuit see Step 6C & 6D.
Additional Materials That May Be Necessary
1. 1/4" diameter plastic supply tubing or 1/4" copper supply tubing for hot water applications
2. Air pressure switch Model GF-12500 suggested
3. Current sensing relay Model GF-GA50 suggested
4. Junction box, 115 V. grounding outlet, cover and wire
5. 5/8" Drain tubing GF-1099-16 suggested
Specifications
•Model: GF-1137LLegacy Flow Through Humidifier
•Type: Fan Powered Flow Through
•GPD: 18 Based on 120° F Plenum Temperature
•Warranty: 5 Years
•Replacement Vapor Pad®:GF-990-13
(Replace 1-2 times per season)
•Dimensions: 14” H x 16” W x 11” D
•Weight: 19 Lbs.
•Home Size: To 3,000 Sq. Ft.
•Installation: Warm Air Plenum
•Plenum Opening: 15” W X 9-3/4” H
•Bypass Duct: 6”
•Pallet Qty: 21
•Cabinet Construction: UV-Stable Automotive Grade
Plastic
•Humidistat: Models: GF-MHX3 (Included)
•Voltage: 120V
•In Box: Humidier, humidistat, Installation Instructions, Vapor Pad®, Parts Kit, Water
Tube Kit, Humidistat Wire, Drain Pan, Power Supply Cord, Water Distribution Trough.
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16” W
14” H
11” D
Top Of Template
TEMPLATE FOR INSTALLING
POWER HUMIDIFIER
4. TIGHTEN SCREWS ANDADJUST HUMIDIFIER UNT ILLEVEL.
5. REMARK FOUR REMAINING HOLES IF NECESSARY.
6. REMOVE HUMIDIFIER, DRILL REMAINING HOLES AND CUT OUTCENTER SECTION O F
TEMPLATE.
WHEN INSTALLING ON BASEMENTTYPE FURNACE, EXTEN DTHIS LINE
FOR LOCATING HOLE ONADJACENT PLENUM
IF FURNACE JACKET EXTENDS MORET HAN 3" OUTWARD FROM THE PLENUM SURFACE
ALLOW 4" CLEARANCE BELOW THIS LINE FOR EASYA CCESS TODRAIN HOSE CONNECTION.
CUT ON THIS LINE
TEMPLATENO. 1137
ALLOW 2 1/2 INCHES CLEARANCE
ABOVE THIS SURFACE FOR SERVICING
FOLLOW INSTRUCTIONS PACKED WITH HUMIDIFIER
1. REMOVE PROTECTIVE PAPER FROM BACK OF TEMPLATEAND 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 INSTALLDRAIN PAN, EVAPORATOR
PADAND DISTRIBUTORTROUGH.
1. Select location on vertical surface of warm air plenum for
mounting humidier. Stick mounting template in place
making sure the template is level.
CAUTION: Do not install humidier where the blanked off
ends of a cooling coil will restrict air ow to the humidier.
Installation
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Model 1137 Humidier Installation Manual
Installation Cont.
2. Cut out center section. Install one cabinet retaining clip in
each of the two top holes to assist holding cabinet while
installing six cabinet screws. Install drain pan, evaporator
pad and distributor trough using thumb nuts provided.
3. Mount the self tapping saddle valve on either a cold or 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.
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Saddle Valve / Solenoid Valve Installation
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 & 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.
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.
Cabinet Screws Thumb Nuts
Drain Pan
Distributor
Trough &
Cover
CAUTION: Turn off water supply.
CAUTION: Do not use plastic tubing on hot water or in
contact with any hot plenum surface or duct. Installation
of this saddle valve must meet or exceed local codes and
ordinances.
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COPPER
TUBING
PLASTIC
TUBING
Plastic
Sleeve
Brass
Insert
Brass
Sleeve
Compression
Nut
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Model 1137 Humidier Installation Manual
Installation Cont.
4. Assemble distributor tube so that it is directed into the
center opening of the distributor trough cover.
5. Connect 1/4" water supply tube to brass lter at inlet of
solenoid.
CAUTION: Do not use plastic tubing in contact with any
hot plenum surface or duct. If using plastic tubing, use
tube support provided.
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Installing / Wiring The Control
Distributor Tube
(Metal)
Water
Supply
Tube
Distributor
Trough Cover
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!WARNING: ALL WIRING SHOULD COMPLY WITH LOCAL ELECTRICAL CODES.
Thin Gasket
Face FIG. 1
WALL MOUNT: Use
Outer & Inner Portions
DUCT MOUNT: Use
ONLY Outer Portion
Mounting
Base
Thick Gasket
DUCT MOUNT ONLY
1. Locate the humidistat at least 24" upstream of the
humidier or bypass on the return air duct. Avoid areas
of direct radiation like secondary heat exchangers in the
fan compartment.
2. Place template using level. Cut sensor hole as shown on
template. Drill four 3/32” holes (not shown).
3. Remove the housing from the base by prying with a
small screwdriver at the notch in the side of the housing.
4. Gaskets: Place the outer portion ONLY of the thin foam
gasket on the humidistat base and mount the base
with four screws. Place the thick gasket inside the wall
mount base to seal off air entering through the vents.
Low voltage wire may enter the humidistat under the
foam seal.
5. Connect wires to screw terminals on the control
assembly as shown in wiring diagram. Replace housing.
6.
GF-MHX3: DUCT Mounting (Return Air Duct)
CAUTION:Do not install the humidistat on the warm air duct.
6. GF-MHX3: WALL Mounting Instructions
1. Choose a location for the humidistat about ve feet
above the oor on an inside wall with average room
temperature and humidity conditions.
2. Drill a small hole in the wall and run low voltage wiring
to the location chosen. Pull about 6” of wire through the
hole. Plug the opening to prevent drafts from affecting
the humidistat operation. Remove the housing from the
base by prying with a small screwdriver at the notch in
the side of the housing.
3. Gaskets: Place the entire outer and inner portions of the
gasket on the base as shown. Do NOT install the thick
gasket inside the base.
4. Mount the base horizontally over the wires using level.
Attach directly to the wall, using four screws provided.
5. Connect wires to screw terminals on the control assembly
as shown in wiring diagram. Replace housing.

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Model 1137 Humidier Installation Manual
FIG. 6B WITH WITH CONSTANT POWER TO HUMIDIFIER
Use with mechanical humidistat only. Mount a junction
box and 115 volt grounded outlet. Connect the on-off
switch in series with the hot or black wire. Install a eld
supplied 24 volt relay and attach to HUM and C on the
furnace control board. Install humidistat and connect one
side to one yellow wire on humidier. Connect the other
side of the humidistat to one end of switch side of the
relay. Connect the other switch side of the relay to the
remaining yellow wire on humidier.
CAUTION: Red humidifier leads are not used
for this wiring method. Do not touch red wires
together. Damage to the humidifier will result.
6.
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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

!WARNING: ALL WIRING SHOULD COMPLY WITH LOCAL ELECTRICAL CODES.
FIG. 6A WITH FURNACE CIRCUIT BOARD
On furnaces with output terminals ACC, or EAC
check output voltage to determine that termi-
nals are 115V. Connect on-off switch in series
with the hot wire.
FIG. 6C AIR PRESSURE SWITCH 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 humidier accordingly.
CIRCUIT DESCRIPTION
The humidier 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.
FIG. 6D CURRENT SENSING RELAY WITH TWO-SPEED
BLOWER MOTOR
On furnaces with a two speed blower, the humidier
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 GF-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.
Installing / Wiring Your Control Cont.
6B
(HOT)
C
115v.
60CY.
ON-OFF
SWITCH HUMIDIFIER
120v. OUTLET
GRD
L1
YELLOW WIRES
FROM HUMIDIFIER
FURNACE
CONTROL BOARD
60CY.
24V.
C
HUM
FIELD SUPPLIED
RELAY 24V COIL, N.O.
HUMIDISTAT
C
NO
NC
6B
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Model 1137 Humidier Installation Manual
7. Connect drain hose to 5/8" spout on humidier
cabinet using hose clamp provided. Run 5/8"
hose to suitable drain such as oor drain, sewer
or laundry sink. Be sure hose has continuous
slope and is not kinked at any point.
8 Turn on water supply and plug in power cord to check operation of humidier. Set humidistat to a
demand setting. With the furnace off, the solenoid valve should be closed and the humidier fan not
running. Start the furnace, the solenoid valve should open and the humidier fan run when the blower
or burner circuit is energized. Check flow of water through distributor trough and evaporator pad. The
standard GF-9903776 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 GF-9903775 is available to provide the same
flow. Leave humidistat set at the recommended setting.
Installation Cont.
•The operating principle of the humidier is based on the most efcient 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 humidier is controlled by the electric solenoid valve. The solenoid valve and
humidier 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.
•Water ows through a strainer, is metered through an orice 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 humidier 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
humidiers; they are left on the evaporator pad where a high
percentage is carried off with the waste water.
•When the humidier is installed and operating, no adjustments are
necessary other than setting the control knob on the humidistat to the desired level of humidication.
•To turn the humidier off, close water supply valve, switch electrical power off and turn humidistat off.
• CAUTION: 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.
How the Humidifier Works
At Outside
Temperature
Recommended
Setting
-20°F -29°C 15%
-10°F -23°C 20%
0°F -18°F 25%
+10°F -12°C 30%
+20°F -7°C 35%
+30°F -1°C 40%

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Model 1137 Humidier Installation Manual
Maintenance
Your Humidier is engineered to give helpful and trouble-free humidication. For maximum efciency 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, used Vapor Pad®and drain pan. The Vapor Pad®may be removed
from either the top or bottom of the humidifier. Clean excessive mineral deposits from the distributor trough, drain
pan and humidifier cabinet. A solution of 1/2 vinegar & 1/2 water will help loosen mineral deposits.
3. Insert a new GF-990-13 Vapor Pad® (black notch on top). Install trough and drain pan. Replace the distributor tube
to proper position over the distributor trough. Replace Vapor Pad®yearly for peak performance.
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 from the solenoid valve. Carefully pull the strainer screen
GF-990-17 from the orifice fitting. 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. Close air damper.
Parts Drawing
SOLENOIDVALVE
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
1137-3 DRAIN PAN
P-163 HOSE CLAMP
1099-16 DRAINTUBE
P-103 COMPRESSION NUT
P-104 COMPRESSION SLEEVE
P-111 CONNECTOR
1137-38 CABINET ASSEMBLY
990-37-76 ORIFICE & STRAINER
ASSEMBLY
990-16-76 ORIFICE FITTING
990-17 STRAINER SCREEN
990-18 STRAINER BODY
1137-2 FAN SHROUD
1137-9 FAN BLADE
1137-20FAN GUARD
1137-24 DISTRIBUTOR TUBE
1099-9 THUMB NUT
1137-35 TROUGH COVER
1137-4 DISTRIBUTOR TROUGH
990-13 EVAPORATOR PAD
1137-31 POWER SUPPLY CORD

Model 1137 Humidier Installation Manual
Troubleshooting
1. My humidifier continues to run.
Check for the following:
•The valve might be stuck in the "open" position.
•Check for wiring errors.
•Is the unit sized properly for your home? If it is rated for a smaller-sized home than the home in which it is
installed, it will work "overtime" to reach the humidification levels desired.
•Check the Vapor Pad®. If it is clogged, the pad will reduce the humidifier efficiency. Replace if necessary.
2. My solenoid valve is making a "chatter" noise.
This can be caused by any of the following:
•The power to the valve is less than 18V AC.
•The solenoid is causing a "water hammer condition" thru the water pipes (valve closes quickly and shuts off
water flow, which in turn creates pressure behind the valve that has no avenue of relief). You may want to install
a water hammering device with your plumbing, or contact your local plumber to determine the best solution.
•The humidistat is located too close to the humidifier or the by-pass pipe. Your humidistat should be a min. of
1.5' away or greater.
•The humidistat could have a buildup of dust, causing a faulty reading.
•The solenoid valve might be dirty. Remove, inspect and clean if necessary.
•Water supply pressure going to the valve may be too low.
•The hold down nut on top of the solenoid, as it may be loose.
3. The humidifier is not raising the humidity levels in my home.
Check for the following:
•Ensure you have changed / replaced your Vapor Pad®at the proper intervals (once per year) to ensure the
greatest production of moisture.
•Check the setting of your humidistat to ensure it is set higher than current humidity levels in your home (when in
doubt, turn it all the way to the right at maximum production). If you don't know what your current humidity
level is, use an instrument called a thermohygrometer (Model GF-610 suggested) to measure both heat and
humidity levels in your home.
•Check to see that your humidifier model is designed to produce the amount of moisture (GPD) you need.
•Have you recently installed hardwood floors? Have you recently remodeled and added on to your home? These
can both increase your home's demand for humidity. Options include connecting your humidifier to the hot
water supply (which can increase output by as much as 30%), or installing a new humidifier model that can
generate more humidity.
•The unit is not recommended for heat pumps or plenum temperatures < 120° F.
4. My humidifier will not turn on.
The following might be occurring:
•Check to see your humidifier is plugged in, that the breaker is engaged, and that power to other items from the
same source is working.
•Check the on/off switch to be sure it is in the O (Open / Summer) position.
•Ensure a fuse has not blown.
•Check that connectors are properly inserted in the terminal block.
•Make sure the furnace is operating in the heat mode.
To ensure your safety and the longevity of your unit, we recommend
contacting a licensed contractor to perform any repairs or maintenance.

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Model 1137 Humidier Installation Manual
FAQ’s
1. How does a humidifier help with my allergies?
Dry air can lead to a host of problems for allergy and asthma sufferers. Dry climates, winter air, and articial
heat all contribute to the discomfort by drying out your skin, throat and delicate sinus passages and airways
(which can contribute to sinusitis). Winter is an especially bad time for dry air as home heating systems,
especially forced-air systems, reduce the amount of moisture in the air while humidity levels outdoors typically
dip as well.
2. What range of humidity is ideal?
Research shows that 40-60% relative humidity is ideal. Outside this range, your risk of being adversely affected
increases.
3. How often should I change my Vapor Pad®?
We recommend replacing your Vapor Pad®at least once per year. Minerals build up on the vapor pad over
time, which in turn:
•Reduces the pad's ability to absorb water.
•Prevents the warm air from owing through the pad (Warm air moving though the water-soaked pad
causes the water in the pad to evaporate. It is this process that delivers moisture throughout your home
via the home's duct system).
4. Can't I simply clean my Vapor Pad®instead of replacing it?
At the factory we put a coating on the Vapor Pad®that helps it absorb water and control water ow. This
coating is very efcient, however, it is also fragile. The coating is similar in composition to the minerals
that accumulate on the pad. If you subject the Vapor Pad®to cleaning, you usually remove much of the
coating and the pad becomes ineffective. This reduces the output of the humidier and increases water
consumption.
Instead we recommend the Vapor Pad®be replaced each year.
5. Why would I want to install a humidifier?
For many reasons:
1. Since the air in your home is always trying to reach its saturation point, it will absorb water wherever
it can; from the bodies of you and your children, your pets, your furniture and even your house plants.
As a result your skin, throat and nasal passages dry out, leaving you more susceptible to physical
discomfort, colds, u and even infection. Allergy and asthma sufferers can be especially affected by air
that's too dry.
2. Dry air causes dry, itchy skin.
3. Dry air cracks expensive woodwork, oors, musical instruments, artwork and furnishings.
4. Annoying static electricity (caused by dry air) can damage computers, VCR’s and other electronic
equipment, requiring expensive repair.
5. Dry air can cause harm to expensive musical instruments like pianos and violins.
6. Dry air causes gaps in window & door frames, letting cold outdoor air in; causing you to turn up the heat
and increasing your heating bills! Controlled humidity from a GeneralAire®Humidier allows you the
luxury of dialing the thermostat back & reducing annual heating bills. For example, 68° at 40% relative
humidity feels just as warm as 74° at 20% humidity. Setting your thermostat back by as little as three
degrees can reduce annual heating bills by as much as 5%.
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