Wiring
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 GFX4 display is on.
5. Set to TEST MODE by pressing “DROP”and
“THERMOMETER” 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 humidier operation ceases.
7. The GFX4 will stay in OFF Mode unless set to
Manual or Automatic mode. See below.
Operating Modes
Press any button to light the display. Press the “DROP”
button to select the Operating Mode, O, Manual or Auto.
O Mode
The Humidier is turned o.
Manual Mode
The GFX4 will work to maintain the single
humidity selected. You can set your desired
humidity level by pressing“UP” or “DOWN”.
The humidier will turn ON or OFF according
to your manual setting. The humidier 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 humidier is operating, the“+” will
display. Humidity may have to be lowered when
weather is colder or if condensation is expected. The
settings table to the right or a similar table may be used
to compensate for cold outside temperatures.
Display a Temperature
Press the“THERMOMETER” button to move between displaying
indoor and outdoor temperature. “Tree” symbol will be displayed
when showing outdoor temperature. “House” symbol will be
displayed when showing indoor temperature. To change between
°F and °C units, press the“ °F/°C ” button.
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 specied in the
Magnuson-Moss Warranty Act.
FORM GFX4-11 Rev. B 9805-100-001
Humidier Runs Continuously
If humidier operates while HVAC system is o, check that power to humidier is
switched with HVAC operation.
Humidier Does Not Run
Check wiring to/from GFX4 control. Verify 18-30 VAC. Use “TEST MODE” .
Humidier Runs When Air Conditioning Is On
If this is undesirable, change wiring to be powered only in heating periods.
Humidity Not High Enough
Check humidier, water supply, electrical connections.
HVAC operating time too short.
Humidier undersized (Review humidity load and humidier capacity).
Humidity Too High
Wiring fault. Set GFX4 to“OFF”mode and check that operation ceases.
Outdoor sensor is being kept warm. Check that sensor is not buried in snow
on south or west side of house, warmed by sun, or is too far inside of air intake.
Trouble Shooting
“HOUSE” Flashing The indoor temperature sensor has failed.
“TREE” Flashing The outdoor temperature sensor has failed.
Humidier Turns On and O Repeatedly
Check that input voltage is between 18 and 30 VAC and not
intermittent.
Check that humidistat is NOT mounted on supply duct,
downstream of humidier, or closer to humidier than 12 inches.
Make sure that Outdoor Sensor wiring is not close to line voltage
wires.
Auto Mode
The GFX4 will automatically raise the humidity as the outdoor temperature increases. This
provides the highest possible humidity. The GFX4 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 from1(low) to 10 (high) by pressing “UP”
or “DOWN”. The Humidity Index is based on the outdoor temperature and indoor humidity.
The humidier will switch ON/OFF according to the calculated auto humidity index set point.
When the humidier 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, energy ecient windows and high R value insulation.
See chart at right.
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, energy ecient windows.
9-10 Built after 1990, poly vapor barrier, R38 insulation, foam exterior cladding,
energy ecient windows.
If condensation is seen, reduce index by 2 until condensation stops. The level bars indicate
the humidity index; one bar for two index points.
Oset Mode
To change the calibration of the GFX4, an oset 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 oset. Press both “UP” and “DOWN”buttons together
again to change the Outdoor Temperature oset.
Humidity Outdoor Temperature °F
Index -20 -10 0 10 20 30 40 50
1 0 5 10 15 20 25 30 35
2 3 8 13 18 23 28 33 38
3 6 11 16 21 26 31 36 41
4 9 14 19 24 29 34 39 44
5 12 17 22 27 32 37 42 47
6 15 20 25 30 35 40 45 50
7 18 23 28 33 38 43 48 53
8 21 26 31 36 41 46 51 56
9 24 29 34 39 44 49 54 59
10 27 32 37 42 47 52 57 62
Auto Mode Target Humidity
Outdoor Suggested
Temperature Setting
15%
20%
25%
30%
35%
40%
-29°C
-23°C
-18°C
-12°C
- 7°C
- 1°C
-20°F
-10°F
0°F
+10°F
+20°F
+30°F
SNSR 2
SNSR 1
FAN - (G)
FAN +
HUM 2
HUM 1
AC C (C)
AC L (R)
SNSR 2
SNSR 1
FAN - (G)
FAN +
HUM 2
HUM 1
AC C (C)
AC L (R)
WIRING TO FAN POWER HUMIDIFIER
CONSTANT
24 VOLTS YELLOW
YELLOW
120 VOLTS
SWITCHED
W/ FURNACE
OPERATION
WIRING TO ELITE STEAM HUMIDIFIERS
R C G
N2
GND
N1
AB
AB
GND
IN
NO
C
NC
C
NO
GND
24V
EXT
FAN ALARM
JUMPER
JUMPER
SNSR 2
SNSR 1
FAN - (G)
FAN +
HUM 2
HUM 1
AC C (C)
AC L (R)
WIRING TO 24V. HUMIDIFIER
CONSTANT
24 VOLTS
24 VOLTS
SWITCHED
W/ FURNACE
OPERATION
24 VOLT HUMIDIFIER
SOLENOID VALVE OR
DRUM MOTOR
JUMPER
HVAC EQUIPMENT STEAM HUMIDIFIER
Note:
1. Manufacturer installed jumper is required for HVAC blower control
2. Separate sensor leads from line voltage wires by at least 4 inches;
sensor wire length 200 feet max.
PUSH
5 SEC.
BLINK !
“DROP”
“UP”
“DOWN”
