GeneralAire GFX4 Installation And Operating Instructions

INSTALLATION AND
OPERATING INSTRUCTIONS
About the GFX4 Digital Humidistat
In Automatic Mode the GFX4 will adjust the humidity in your home based on the outdoor
temperature, lowering the humidity in cold weather to reduce condensation. The GFX4 can
operate in Manual 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 GFX4 has the capability for HVAC blower control. The LCD Display is backlit and
easy to read. Operation and Installation are simple. The GFX4 can be mounted on an interior
wall or on the return duct of the HVAC System.
!
WARNING!

This Humidistat must be installed by a Quali ed Technician. 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. Over humidi cation 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 VAC 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.
Speci cations
Voltage 20-30 VAC, 60Hz.
Switching Load 1 amp max. 30 volt
Outdoor Sensor max. 200 ft. (61m.)
Auto Mode
Control Range 10%-60% RH.
Outdoor Temp. -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
±2°F (±1°C)
Accuracy Indoor Temp.
±2°F (±1°C)
Accuracy Outdoor Temp.
Resolution, Temp. or RH 1° or 1%.
Setting - 1%RH
Relay Close
Setting +1%RH
Relay Open
Technical Support
Canadian General Filters, Ltd.
General Filters, Inc.
400 Midwest Road
43800 Grand River
Toronto, ON M1P3A9 Canada
Novi, MI 48375
www.CGFProducts.com
www.GeneralFilters.com
Tel 416-757-3691
Tel 248-476-5100
With Furnace
Blower Motor
Control
GFX4 Locations
YES!
YES!
Wall Installation
1" Hole.
Wall base has vents.
If wires are run inside wall,
cut rectangular opening.
Secure the base with the
two plastic anchors and
screws.
®
®
YES!
YES!
Inlet of Air Intake
from humidistat.
Duct Installation
Outdoor Sensor Location
YES ! NO!
North Wall South Wall
East Wall West Wall
Over Snow Line Below Snow
Deep in Intake
Less than 200' More than 200'
from humidistat.
1" Hole.
Duct base: no vents.
If wires are run inside duct,
cut rectangular opening.
Secure the base with the
two sheet metal screws.