General Aire 4400A Fan Assist Evaporative Humidifier Instruction Manual

: June 1, 2024
: General Aire

Model 4400A

Installation Manual

Fan-Assist Evaporative Humidifier

Automatic

Please Read And Save These Instructions

USA Model Canadian Model
4400A (GFI #5961) GF-4400A

Patent Pending

Supply Plenum Installation Location: The model 4400A fan-assist evaporative humidifier must be installed on the supply plenum (ONLY) of a forced air handling system. Select a location for the humidifier that allows for service and maintenance.

Return
Supply
Vertical Installation
Drain Line

CAUTION!
This symbol and the word “CAUTION” indicates:
IMPORTANT INSTRUCTIONS!

WARNING!
This symbol and the word “WARNING” indicates:
IMPORTANT INSTRUCTIONS!

Failure to heed CAUTION! or WARNING! can result in serious injury or death.

Inside The Box

GA35 Vapor Pad® (GFI #7902)
Solenoid Valve Assembly
GFX4 Digital Automatic Humidistat (GFI #7170)
Installation Hardware
Push-to-Connect Valve for 1/2 copper or PEX
1/4″ Diameter plastic supply tubing for cold water applications
Electrical wire and wire nuts
(6) #8 x 1/2” Long self-piercing sheet metal screws

CAUTION! 24V Transformer is Factory Installed. Do NOT Connect Any Power Supply Source to the External Yellow & Red Wires.

WARNING: DISCONNECT ELECTRICAL POWER BEFORE BEGINNING INSTALLATION.

Off

IMPORTANT: To ensure your safety and the longevity of your unit, we recommend:

Contacting a licensed contractor to perform maintenance or repairs.
Changing your Vapor Pad® at the start of each heating season.

WARNING: Do not install where ambient temperatures fall below 32°F / 0°C or where plenum temperatures exceed 200°F / 93°C. For maximum evaporative capacity, install this humidifier on the warm air supply plenum.

Form No. 4400-18 REV B

INSTALLATION – SUPPLY (ONLY)

1 Prepare Duct

Cut a rectangular hole using the manufacturer-supplied mounting template.

For serviceability, please allow an obstruction-free zone of at least 4″ (101.6mm) on the right side and bottom of the humidifier.

2 Affix Chassis

Install the humidifier chassis, making sure the drain spout is pointing downward, as shown.
Level the chassis and install using the six mounting screws included.

3 Install the Push-to-Connect Valve

1. Select desired valve location.

2. Remove 0.6in (15mm) of pipe to account for valve width (Fig. A).
Make sure both pipe ends are square, deburred and clean.

Fig. A

3. Mark both pipes at the insertion depth, 0.95″ (24mm) (Fig. B).

Fig. B

4. Firmly insert both pipes into fitting until at full depth.
Verify each pipe is fully inserted. The depth mark will be within 0.005″ (0.13mm) of the release collar (Fig. C).

Fig. C

4 Configure Water Supply Tubing

Utilizing copper tubing requires a brass compression nut and brass sleeve.
Utilizing plastic tubing requires a plastic sleeve on the outside with a brass compression nut.

HOT WATER – COPPER TUBING 1/4″

COLD WATER – PLASTIC TUBING 1/4″

Brass Sleeve P-102
Plastic Sleeve P-190
Compression Nut P-101

5 Connect Water Supply

Connect 1/4″ water supply tube to brass inlet of solenoid.
Turn on water supply and check for leaks.

CAUTION: Do not use plastic tubing in contact with any hot plenum surface or duct.

Solenoid Assy 4400-05
1/4″ Water Supply Tube
Compression Nut P-101
Compression Sleeve P-190

6 Connect Drain Hose

Connect the 1/2″ ID drain hose to the spout on the humidifier cabinet using the provided flat spring clip.
Run the drain hose to a suitable drain such as floor drain, laundry sink or to a condensate pump (sold separately). Be sure the hose has continuous slope and is not kinked at any point.
1/2″ Spout
Flat Spring Clip
1/2″ Drain Hose

CONNECTING THE GFX4 TO THE 4400A

7 Wiring the GFX4 Without Relay or Air Proving Switch

Option 1: Interlocked with call for heat and with use of field-supplied jumper between AC-C and HUM1

General Aire 4400A Fan Assist Evaporative Humidifier -
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GeneralAire® GFX4 Humidistat
Thermostat
Furnace
3-wire Cable
Field Supplied
JUMPER
2-wire Cable
Field Supplied
Wire Splices
Blue Wires
GeneralAire® GF-4400A Fan-Assist Humidifier
Yellow Wires
Cap each wire separately.
Do not touch together.
Red Wires
115v Power Supply Cord

Option 2: Blower activation on humidity call and with use of field- supplied jumper between AC-L and HUM1

General Aire 4400A Fan Assist Evaporative Humidifier -
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GeneralAire® GFX4 Humidistat
Thermostat
Furnace
3-wire Cable
Field Supplied
JUMPER
2-wire Cable
Field Supplied
Wire Splices
Blue Wires
GeneralAire® GF-4400A Fan-Assist Humidifier
Yellow Wires
Cap each wire separately.
Do not touch together.
Red Wires
115v Power Supply Cord

CONNECTING THE GFX4 TO THE 4400A & TESTING THE UNIT

7 Utilizing Traditional Wiring to Connect the GFX4

Option 3: Interlocked with call for heat and with use of field-supplied 24V isolation relay

General Aire 4400A Fan Assist Evaporative Humidifier -
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GeneralAire® GFX4 Humidistat
2-wire Cable
Field Supplied
Isolation Relay, 24vac coil
Field Supplied
Furnace
Thermostat
4-wire Cable
Field Supplied
Yellow Wires
GeneralAire® GF-4400A Fan-Assist Humidifier
Red Wires
Wire Splices
115v Power Supply Cord

Option 4: Interlocked with blower and with use of field-supplied GA50 sensing relay or 12502 air pressure switch

General Aire 4400A Fan Assist Evaporative Humidifier -
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GeneralAire® GFX4 Humidistat
GA50 Current Sensing Relay
Field Supplied
MULTI SPEED BLOWER MOTOR
COMMON LEAD
12502 Air Proving Switch
Field Supplied
4-wire Cable
Field Supplied
Yellow Wires
GeneralAire® GF-4400A Fan-Assist Humidifier
Red Wires
Wire Splices
115v Power Supply Cord

8 Test the Operation of the Unit

Turn on the water supply.
Turn the humidistat RH% to 75%.
Turn the furnace on; heat cycle. Make sure the furnace blower motor is on.
Once the solenoid valve is energized the valve should open.
Check flow of water through distributor trough and Vapor Pad® (3.5 GPH of water at a line water pressure of 60PSI).
Check fan operation (ON).
Reduce RH% to desired setting after test completion.