GeneralAire GF-1000LHM Operating instructions

Model GF-1000LHM/LHD
Installation & Owners Manual
• Installationbyanyoneotherthanaqualiedcontractorvoidsthewarranty.
• Productdesignedforresidentialinstallationonly.Commercialinstallationvoidswarranty.
• Modicationoralterationofproduct,parts,installationinstructionsorlocalsafetycodesvoidswarranty.
• Readourfullwarrantypolicyattheendofthisdocument.
Please Read And Save These Instructions
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual
3
3
3
4-5
5-6
7
7
8
8
9
9
10
10-11
Model 1000 Table of Contents
Table of Contents
Specifications
Unit Location
Additional Materials That May Be Necessary:
Installation
Installing The Control
Final Steps Of Installation
How The Humidifier Works
Maintenance
Parts Drawing
Humidifier Chassis Cut Out
Inside Your Box
Trouble Shooting
FAQ’s
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.

!

!
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]
WARNING!
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 1000 Humidier Installation Manual
Unit Location
•For installation on a vertical surface of the warm air plenum of any forced air furnace.
• WARNING: Disconnect electrical power before beginning installation.
• Do not install where temperatures fall below 32°F / 0° C or where plenum temperatures exceed 200° F / 93° C.
For maximum evaporative capacity, install this humidier on the warm air supply plenum.
Additional Materials That May Be Necessary:
1. 1/4" Diameter plastic supply tubing for cold water applications, or 1/4" copper supply tubing for hot water applications
2. Current sensing relay (Model GF-GA50)/ or single pole single throw isolation relay
3. Junction box, 115V grounding outlet, cover and wire
4. 1/2” I.D. Drain hose / 3/4" PVC drain
5. #8 Self-piercing sheet metal screws
6. Misc. wire and connectors
Specifications
•Model: GF-1000LHM/LHD Elite Flow Through Humidifiers
•Type: Fan Powered Flow Through
•GPD: 18 Based on 120° F / 49° C Plenum Temperature
•Warranty (Years): 10
•Replacement Vapor Pad®:GF-GA900 (Replace 1-2 times per season)
•Dimensions (Inches): 16 W x 16-1/2 H x 10-1/2 D
•Weight (Pounds): 15
•Home Size (Sq. Ft.): To 3,000
•Installation: Warm Air / Return Air Plenum
•Plenum Opening (Inches): 14-1/8 W X 12 H
•Pallet Qty: 24
•Cabinet Construction: UV-Stable Automotive Grade Plastic
•Humidistat (Included):GF-1000LHM -GF-MHX3 / GF-1000LHD - GF-X3
•
•

!
Voltage: 120VAC
In The Box: GF-1000LHM: GF-MHX3 / GF-1000LHD: GF-X3 (Included) Humidifier,
16” W
Humidistat, Control Bypass Damper, Solenoid Valve, Vapor Pad®, Saddle Valve, (GCV3412 Code Valve -
GF-1000LHD), Installation Instructions, Template, Parts.
16-1/2” H
10-1/2” D
Expected Humidity Performance Coverage in Square Feet Based on Construction Type
Model No. GPD Loose
(0.75 AC/H)
Average
(0.50 AC/H)
Tight
(0.30 AC/H)
Elite 1000 18 1175 Sq. Ft. 1770 Sq. Ft. 3000 Sq. Ft.
Outside Design Temperature 0° F / -18° C
Outside Design R.H. 70% R.H.
Inside Design Temperature 70° F / 21° C
Inside Design R.H. 30% R.H.
Air Changes/hour (AC/H) 0.30
Ceiling Height (Feet) 8
Furnace Plenum Temperature 120° F / 49° C
Furnace Run Time For Calculating Sq. Ft. 8 Hour /1 Day
Humidifier Performance Baseline Criteria
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual
Installation
1. Select a location on the vertical surface of warm air plenum
of a forced air handling system for mounting humidier that
allows for service and maintenance. Do not install humidier
where the blanked off ends of a cooling coil will restrict air
ow to the humidier. Cut out a square section 12-1/8” tall
by 14-1/8” wide as shown.
2. Open the cover and remove the evaporator pad assembly.
The humidier chassis is self retaining. Slide the top side
in rst, then slide the chassis down. Level the chassis and
install the eight screws (included).
3. 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 in addition to a plastic ferrule and brass nut.
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.
4. Connect 1/4" water supply tube to inlet of solenoid.
Connect drain hose to 1/2" spout on humidier cabinet using
hose clamp if necessary. Run 1/2" 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.

!
1
2
4
12-1/8”
14-1/8”
COPPER
TUBING
PLASTIC
TUBING
Plastic
Sleeve
Brass
Insert
Brass
Sleeve
Compression
Nut
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual
5. GCV3412 Code Valve Installation Instructions*
Copper Pipe:
1. CAUTION: Turn off water supply.
2. Clean pipe, ttings and valve with sandpaper or wire brush.
3. Apply a thin layer of ux to all surfaces to be soldered.
4. Assemble valve to pipe and/or ttings.
5. Cooling the valve by wrapping a wetted rag around the valve is optional.
6. WARNING: For your safety, this should be performed by a
licensed contractor only. Heat the joints with a torch. Apply solder to
each joint. Continue to apply heat sufcient to keep solder liquid.
7. After solder has lled entire joint area, remove heat and allow joint to cool. Do
not move or disturb.
8. Slide compression nut over 1/4” copper tube followed by compression sleeve.
9. Insert tube into valve fully and tighten nut.
10. Turn on water supply and check for leaks.
*Code Valve Is Included With Automatic Models Only
Installation Cont.

!

!
1/2”TEE
3/4”TEE
Installing The Control
GFX3 (Automatic Models) MHX3C (Manual Models)
24V OUTPUT FROM HUMIDIFIER (RED WIRES) OR
727-58 24 V. TRANSFORMER WITH CONSTANT POWER
OR 24 VAC POWER SUPPLY WITH CONSTANT POWER
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
OUTDOOR TEMP. SENSOR
(NOT USED IN MANUAL MODE)
AC L
AC N
HUM
SNSR
Thin Gasket
Face FIG. 1
WALL MOUNT: Use
Outer & Inner Portions
DUCT MOUNT: Use
ONLY Outer Portion
Mounting
Base
Thick Gasket
DUCT MOUNT ONLY
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual

!
Installing The Control, Cont.
WARNING: All Wiring Should Comply With Local Electrical Codes.
6A With Furnace Circuit Board
Use with mechanical humidistat only. 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. Install humidistat and
connect to yellow wires on humidier.
6B With Constant Power To Humidifier
Use with mechanical humidistat only. Mount a junction box and 115V grounded outlet. Connect the on-off
switch in series with the hot or black wire. Install a eld supplied 24V 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.
CAUTION:Do not touch red wires together. Damage to the humidifier will result.
6C With Electronic Humidistat - Pressure Sensing
On furnaces with a two speed blower, the humidier and a Model 12500 Air Pressure Switch may be wired
from a continuous 115V power source. Install the on/off switch in series with hot or black wire and Air
Pressure Switch in series with the humidistat circuit. The Air Pressure Switch will detect furnace operation
and supply power to the humidier accordingly.
6D With Electronic Humidistat - Current Sensing
On furnaces with a two speed blower, the humidifier may be wired from a continuous 115V 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.
AC L
AC N
HUM
SNSR
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
ACC
EAC
(HOT)
C
115v.
60CY.
ON-OFF
SWITCH
6A
6C
6B
HUMIDIFIER
120v. OUTLET
COMMON LEAD C
HI
LO
GA50 CURRENT
SENSING RELAY MULTI
SPEED
BLOWER
MOTOR
6D
HUMIDIFIER
L1
(HOT)
L2
115v.
60CY.
ON-OFF
SWITCH
GRD
HUMIDIFIER
120v. OUTLET
GRD
12500 AIR
PRESSURE
SWITCH
NO
C
AC L
AC N
HUM
SNSR
HUMIDIFIER CONTROL LEADS
(YELLOW WIRES)
L1
(HOT)
L2
115v.
60CY.
ON-OFF
SWITCH GRD
120v. OUTLET
HUMIDISTAT POWER LEADS
(RED WIRES 24 VAC)
HUMIDISTAT POWER LEADS
(RED WIRES 24 VAC)
(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

!
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual
•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 the water supply valve, switch the electrical power off, and turn the
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.
77

!
Final Steps Of Installation
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%
7. Replace evaporator pad assembly and humidier cover.
CAUTION: To prevent possible injury, ensure cover is fully
seated before continuing to next step.
Insert low voltage six connector wiring harness from cover
into chassis solenoid harness.
8. Turn on the water supply and plug in the power cord to
check operation of humidier. Set the 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 ow of water through distributor trough
and evaporator pad. The standard GA4231 yellow orice
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 orice GA4299 is available to provide the same ow.
Leave humidistat set at the recommended setting.

!
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual
GA4237 MOTOR
900-71 NAMEPLATE
900-9 NOZZLE
900-10 SPOUT
900-40 PAD RAIL
GA19 EVAPORATOR PAD
900-15 DISTRIBUTOR TROUGH
GA4247 FAN BLADE
GA4231 ORIFICE - YELLOW
P-190 COMPRESSION SLEEVE (PLASTIC)/P102 COPMRESSION SLEEVE (BRASS)
P-101 COMPRESSION NUT
GA4235 DISTRIBUTOR TUBE
P-189 TUBE SUPPORT
P-101 COMPRESSION NUT
P-102 COMPRESSION SLEEVE (BRASS) OR
P-190 COMPRESSION SLEEVE (PLASTIC)
GA4004 STRAINER SCREEN
GA4045 SOLENOID & HARNESS
ASSEMBLY
900-14 DRAIN PAN
1000-11 HARNESS - BOARD
GA4238 RELAY ASS'Y
1137-31 POWER SUPPLY CORD
Parts Drawing
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 the water supply and electrical power to the humidifier.
2. Remove cover, water distributor trough, used Vapor Pad®, pad rails and drain pan. Clean excessive mineral
deposits from the distributor trough, drain pan, pad rails and humidifier cabinet. A solution of 1/2 vinegar & 1/2
water will help loosen mineral deposits. Inspect drain hose, clean or replace as necessary.
3. Insert a new GF-GA900 Vapor Pad® (black notch on top). Install trough, pad rails and drain pan. Replace cover,
reconnect electrical plug. 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. Carefully pull the strainer screen from the valve body. Clean the mineral deposits from all parts. If
the orifice is clogged, it may be opened by inserting a small pin. Reinsert the filter into the valve body.
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 the water supply and electrical power to the humidifier.
GA900

Model 1000 Humidier Installation Manual
Inside Your Box
Humidifier Chassis Cut Out
Model GF-1000LHD includes:
Humidifier components: GF-GA900 Vapor pad, Solenoid Assembly
Accessories: GF-X3 Automatic Digital Humidistat, Code Valve, Saddle Valve
Model GF-1000LHM includes:
Humidifier Components: GF-GA900 Vapor Pad, Solenoid Assembly, Relay Circuit
Board Accessories: GF-MHX3 Manual Humidistat, Saddle Valve
16-3/4” 17”
16-1/2”
12-1/8”
14-1/8”
Humidier Chassis with plenum
cut out shown as dashed lines
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual
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.
FAQ’s
Troubleshooting
1. My humidifier will not operate.
Check for the following:
•Set thermostat to operate both furnace burner and blower. Operation may be necessary for system power.
•Humidity level in home may be higher than humidistat setting. Increase humidity setting on humidistat.
•Verify water supply is on.
•Check for voltage at the solenoid valve. Voltage should be 24VAC.
•Verify wiring of humidifier and humidistat.
•Contact licensed GeneralAire®contractor to verify voltage in and out of the relay board, and replace if
necessary.
2. Proper voltage present at solenoid valve (24 VAC) but no water flow.
This can be caused by any of the following:
•Verify water supply is on.
•Verify metering orifice is not obstructed. Very hard water with high mineral content may restrict the metering
orifice in as little as one heating season. Replace Yellow metering orifice GF-GA4231 if restricted.
3. The humidifier runs without furnace operation or humidifier never shuts off.
Check for the following:
•Verify humidifier and humidistat wiring. Humidifier should operate with furnace burner or blower cycle.
4. Too much humidity in home and/or condensation on windows.
•Reduce the setting on the humidistat. Refer to How The Humidier Works Section of this manual to estimate
a humidity setting for the home based on outside temperature (humidistat generally located on furnace return
plenum or on an inside wall in the living space).
To ensure your safety and the longevity of your unit, we recommend
contacting a licensed contractor to perform any repairs or maintenance.

!
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]

Model 1000 Humidier Installation Manual
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 Vapor 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 I clean my Vapor Pad®instead of replacing it?
A coating is applied to the Vapor Pad®that helps it absorb water and control water ow. 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.
Replace the Vapor Pad®annually.
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 the 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%.
FAQ's Cont.
Our Brands
®
Last Updated: 05-2021
400 Midwest Rd.
Toronto, ON M1P 3A9
Canada
Toll Free: [phone]
www.generalaireiaq.ca
[e-mail]