GeneralAire GFX3 User manual

Please Read And Save These Instructions
• 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.
Breathe Healthier
About the GFX3 Digital Humidistat
In Automatic Mode the GFX3 will adjust the humidity in your home based on the outdoor temperature, lowering the humidity
in cold weather to reduce condensation. The GFX3 can operate in Manual or Automatic Mode to control humidity to a
specic relative humidity. In most homes, Automatic operation is preferred to reduce condensation on windows and within
the structure. Manual mode is necessary where the outdoor temperature sensor cannot be installed. Manual mode may be
desirable where valuable artwork, instruments or woodwork demand constant humidity. The LCD Display is backlit and easy
to read. Operation and Installation are simple.
WARNING!
Always TURN OFF POWER TO THE HVAC SYSTEM prior to installing or servicing the humidier or humidistat. Improper
operation can result in over or under humidication. This humidistat requires a 24 volt, AC power supply. Improper voltage
can cause malfunction or damage to the control. Do not run outdoor sensor wires on or near line voltage wires. The
technical specications for this product and the contents of the user manual are subject to change without notice.

!
Canadian General Filters, Ltd.
400 Midwest Rd.
Toronto, ON M1P3A9 Canada
Toll Free: [phone]
www.cgfproducts.com
General Filters, Inc.
43800 Grand River Avenue
Novi, Michigan 48375
Toll Free: [phone]
www.generalaire.com
GFX3 Humidistat
(GFI #7050)
Installation Manual
GENERAL FILTERS
INCORPORATED

2
Model GFX3 Humidistat Installation Manual
GFX3 Locations
Outdoor Sensor Location
YES!
• North Wall
• East Wall
• Over Snow Wall
• Inlet of Air Intake
• Less Than 200 Feet From
Humidistat
NO!
• South Wall
• West Wall
• Below Snow
• Deep in Intake
• More than 200 Feet From
Humidistat
Wiring
Wiring The
Outdoor
Sensor
Wiring To
Fan Power
Humidier
Wiring To
Elite Steam
Humidiers
Wiring To
24V
Humidier
Specifications
• Voltage: 20-30VAC, 60 Hz
• Switching Load: 1 AMP Max. 30 Volt
• Outdoor Sensor: Max 200 Feet / 61 Meters
Resolution, Temp or RH 1° or 1%.
• Relay Close: Setting - 1%RH
• Relay Open: Setting +1%RH
Automatic Mode
• Control Range: 10% - 60% RH
• Outdoor Temperature: -10°F / - 23°C Min.
Manual Mode
• Control Range: 10% - 75% RH
• Accuracy -RH: (77°F / 25°C - 20% - 80% ± 4% RH)
• Accuracy Drift Per Year: ±0.5%RH
• Accuracy Indoor Temp.: ± 2°F, ±1°C
• Accuracy Outdoor Temperature: ±2°F, ±1°C
YES!
YES!
YES!
YES!
YES!
1" Hole
If wires are run inside wall,
drill hole for wire.
Wall base has vents.
Secure the base with the two
plastic anchors and screws.
1" Hole
Duct base: no vents.
If wires are run inside duct,
drill hole for wire.
Secure the base with the
two sheet metal screws.
Duct
Installation
Wall
Installation
SPLICES: NO MORE
THAN ONE PER LEAD.
200 FEET MAX.
NOTE: Separate sensor leads from
line voltage wires by at least 4 inches.
FIELD
SUPPLIED
SNSR 1 SNSR 2 HUM1 HUM2 AC N AC L
SNSR 1 SNSR 2 HUM1 HUM2 AC N AC L
CONSTANT
24 VOLTS
YELLOW
YELLOW
120 VOLTS
SWITCHED
W/ FURNACE
OPERATION
SNSR 1 SNSR 2 HUM1 HUM2 AC N AC L
CONSTANT
24 VOLTS
24 VOLTS
SWITCHED
W/ FURNACE
OPERATION
24 VOLT HUMIDIFIER
SOLENOID VALVE O
SNSR 1 SNSR 2 HUM1 HUM2 AC N AC L
N2
GND
N1
AB
AB
GND
IN
NO
C
NC
C
NO
GND
24V
EXT FAN ALARM
Max Operating Temperature: 99°F

3
www.generallters.com
Model GFX3 Humidistat Installation Manual
Testing The System
1. Re-assemble system and check all connections.
2. Restore power to the HVAC system.
3. Start HVAC system by raising thermostat setting.
4. Check to see that GFX3 display is on.
5. Set to TEST MODE by pressing “DROP” and “THERMO” together for 5 seconds.
The relay will close and the “+” will ash for 2 minutes or press a key to set to OFF MODE.
6. Set to OFF mode to verify humidier operation ceases.
7. The GFX3 will stay in OFF Mode unless set to Manual or Automatic mode. See “Operation”.
Operating Modes
1. Operating Modes.
2. Press any button to light the display. Press the “DROP”
button to select the Operating Mode, Off, Manual, or Auto.
OFF Mode
The Humidier is turned off.
MANUAL Mode
The GFX3 will work to maintain the single humidity selected. You can set your desired humidity
level by pressing “UP” or “DOWN”. The humidier will turn ON or OFF according to your manual
setting. The humidier will operate when the measured relative humidity falls more than 1% below
the set point until the measured relative humidity is 1% above the set point. When the humidier
is operating, the “+” will display. Humidity may need to be lowered when weather is colder or if
condensation is suspected (see table at right). The GFX3 has a maximum operating temperature of
99°F.
PUSH
5 SEC.
BLINK
!
At Outside
Temperature
Suggested
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%
AUTO Mode
The GFX3 will automatically raise the humidity as the outdoor temperature increases. This provides the highest possible humidity. The
GFX3 will automatically lower the humidity as temperatures drop. This minimizes the risk of condensation on cold surfaces like windows.
The Auto Humidity Index Set Point may be changed from 0 (low) to 10 (high) by pressing “UP” or “DOWN”. The Humidity Index is based
on the outdoor temperature and indoor humidity. The humidier will switch ON/OFF according to the calculated auto Humidity Index set
point. When the humidier is operating, the “+” will display. Lower Index settings are for older homes with less insulation and poor vapor
barriers. Higher Index settings are for newer homes with complete vapor barriers, triple pane windows and high R value insulation.
1-2 Older than 1950, no vapor barrier, little insulation.
3-4 Built 1950-1965, no vapor barrier, R6 insulation.
5-6 Built 1965-1975, craft vapor barrier, R11 insulation.
7-8 Built 1980-1990, craft vapor barrier, R19, double pane windows.
9-10 Built after 1990, poly vapor barrier, R38 insulation, foam exterior cladding, triple pane windows.
If condensation is seen or suspected, reduce index by 2 until condensation stops. The level bars indicate the humidity index; one bar for
two index points.
AUTO Mode Target Humidity
Humidity
Index
Outdoor Temperature F°
-20 -10 0 10 20 30 40 50
10 5 10 15 20 25 30 35
23 8 13 18 23 28 33 38
36 11 16 21 26 31 36 41
49 14 19 24 29 34 39 44
512 17 22 27 32 37 42 47
615 20 25 30 35 40 45 50
718 23 28 33 38 43 48 53
821 26 31 36 41 46 51 56
924 29 34 39 44 49 54 59
10 27 32 37 42 47 52 57 62
“DROP”
“UP”
“DOWN”
"DROP"
"UP"
"DOWN"
"BLINK"
PUSH
5 SEC.
USA: www.GeneralFilters.com Canada: www.CGFProducts.com

4
Model GFX3 Humidistat Installation Manual
OFFSET Mode
To change the calibration of the GFX3, an offset may be entered to the humidity, Indoor Temperature or Outdoor
Temperature displays. Press both “UP” and “DOWN” buttons together to enter OFFSET mode. The word “OFFSET”
and “RH” will display. Press “UP” or “DOWN” to change the humidity calibration. Press both “UP” and “DOWN”
buttons together again to change the indoor temperature offset. Press both “UP” and “DOWN” buttons together again
to change the outdoor temperature offset.
Display a Temperature
Press the “THERMOMETER” button to move between displaying indoor and outdoor temperature. “TREE” will be
displayed when showing outdoor temperature. “HOUSE” will be displayed when showing indoor temperature. To
change between °F and °C units, press the “ °F/°C ” button.
Operating Modes, Cont.
Limited Warranty
This humidistat is warranted to the consumer against defects in materials and workmanship for a period of one year from the date
of installation. 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 to the manufacturer.
There are no express warranties covering this humidistat other than set forth above. The implied warranties of merchantability and
tness for a particular purpose are limited in duration to one year. 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.
Any questions pertaining to this limited warranty should be addressed to the manufacturer. USA: The manufacturer has elected not
to make available the informal dispute settlement mechanism which is specied in the Magnuson-Moss Warranty Act.
Troubleshooting
1. “HOUSE” Flashing: The indoor temperature sensor has failed.
2. “TREE” Flashing: The outdoor temperature sensor has failed.
3. Humidifier Turns On and Off Repeatedly:
• Check that input voltage is between 18 and 30 volts, AC and not intermittent.
• Check that humidistat is NOT mounted:
1. On supply duct.
2. Downstream of humidier.
3. Closer to humidier than 12 inches.
• Make sure that outdoor sensor wiring is not close to line voltage wires.
4. Humidifier Runs Continuously:
• If humidier operates while HVAC system is off, check that power to humidier is switched with HVAC operation.
• If humidier operates every time HVAC System runs, compare humidity to set point. If the humidity is lower than
the set point, the humidistat will call for operation.
5. Humidifier Does Not Run:
• Check wiring to/from GFX control. Verify 18-30 volts. Use “TEST MODE” .
6. Humidifier Runs When Air Conditioning Is On:
• Change wiring to be powered only in heating periods.
7. Humidity Not High Enough:
• Fault with Humidier. Check humidier, water supply, electrical connections.
• HVAC operating time too short. Check humidier trouble shooting.
• Humidier undersized. Review humidity load and humidier capacity.
8. Humidity Too High:
• Wiring fault. Set GFX3 to “OFF” mode and check that operation ceases. Outdoor sensor is being kept warm. Check that
sensor is not buried in snow, on south side of house being warmed by sun or is too far inside of air intake.
USA: www.GeneralFilters.com Canada: www.CGFProducts.com
FORM NO. GFX3 REV B
(8-2018; JPF; InDesign)