GeneralAire GFX3 - Manual

Thank you for
choosing the GeneralAire
GFX3 Humidistat!
About the GFX3 Digital Humidistat
In Automatic Mode the GFX3 will adjust the humidity in your home based on the outdoor tempera-
ture, lowering the humidity in cold weather to reduce condensation. The GFX3 can operate in
Manual Mode to control humidity to a specific 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. The GFX3 can be mounted
on an interior wall or on the return duct of the HVAC System.
Precautions
This Humidistat must be installed by a Qualified Technician. Always turn off power to the HVAC system prior to Installing or Servicing the Humidifier or Humidistat. Improper
operation can result in over or under humidification. Over humidification can result in condensation, structural damage or mold. Condensation within a building’s structure can
cause a loss of structural strength. Condensation can also enable mold and mildew growth resulting in personal injury and damage to building structure and contents. Older
and poorly insulated structures cannot withstand the same humidity levels as newer well insulated buildings. Read these instructions carefully. This humidistat requires a 24
volt, AC power supply. Improper voltage can cause malfunction or damage to the control. The technical specifications for this product and the contents of the user manual are
subject to change without notice.
Duct
Installation
Wall
Installation
Outdoor Sensor Location
YES !
North Wall
East Wall
Over Snow Line
Inlet of Air Intake
Less than 200’ from
humidistat.
NO!
South Wall
West Wall
Below Snow
Deep in Intake
More than 200’
from humidistat.
YES!
YES!
YES!
YES!
GFX3 Locations
1” Hole.
1” Hole.
Duct base: no vents.
If wires are run inside duct,
cut rectangular opening.
Secure the base with the
two sheet metal screws.
Wall base has vents.
If wires are run inside wall,
cut rectangular opening.
Secure the base with the
two plastic anchors and
screws.
INSTALLATION AND
OPERATING INSTRUCTIONS
Specifications
Voltage
Switching Load
Outdoor Sensor
Auto Mode
Control Range
Outdoor Temp.
18-30 VAC, 60Hz.
1 amp max. 30 volt
max. 200 ft. 61m.
10%-60% RH.
-10°F, -23°C min.
Manual Mode
Control Range
Accuracy -RH (77°F, 25°C)
Accuracy Drift Per Year
Accuracy Indoor Temp.
Accuracy Outdoor Temp
10%-75% RH
10%-90% ±3%RH
±0.5%RH
±2°F, ±1°C
±2°F, ±1°C
Resolution, Temp or RH
Relay Close
Relay Open
1° or 1%.
Setting - 1%RH
Setting +1%RH