GeneralAire EDMK4 Elite Steam - Manual (Page 16)

Elite Steam +030222075 Rev. 3.5 – July 2012 16
3.6.1 Connect the GFX3 Humidistat for On/Off Operation:
1. Remove the humidistat from the base, squeeze the louvered base at the top and bottom. To remove the humidistat from
the wall, lift up on the humidistat and pivot top away from wall.
2. Before wall mounting, please remove the black foam gasket.
3. Before return air duct mounting, please remove the breakout piece.
4. If return air duct mounting, route wires between humidistat and base.
5. Mount the sensor outside the house. Do not mount on South side of the house or in direct sunlight. Place at least 4 feet
away from any exhaust vent. If in air intake, place 1 foot or closer to outside wall. Place at least 6” higher than possible
snow. Do not route sensor wire near high voltage wires.
6. Connect the GND-IN terminals on the humidifier to the HUM terminals on the GFX3 Humidistat. Connect the GND-24V
terminals to the ACL-ACN terminals on the GFX3 Humidistat. see Fig.3.x
3.6.2 Modulating Operation
Connect an external 0...10 Vdc modulating input between terminals IN-GND. Connect any
Safety Switches (high-limit, air flow switch, remote on/off) in series to terminals AB-AB. If
no safety switches are used, then a jumper must be installed between AB-AB. DO NOT
apply any voltage to AB-AB.
3.6.3 Connect the GFX50 humidistat for Modulating Operation
To select signal modulating see Fig 3.y Connect the power supply to the GFX50 G and G
O terminals, using the terminal GND and 24V on the Elite Steam. Note MODULATING
OPERATION requires a change in signal type. See SEC. 5.1.1 page 19.
Connect an external signal to the GFX50 using the terminal IN from the Elite Steam and
AOUT in GFX50.
See the diagram below.
GFX3 HUMIDISTAT GFX50 HUMIDISTAT AIR CONDITIONER RELAY INTERLOCK
N2
GND
N1
AB
AB
GND
IN
NO
C
NC
C
NO
GND
24V
AC
L AC
N HUM SN
SR
OUTDOOR TEMP. SENSOR
(not used in manual mode)
Elite Steam
O
N
D
IP
1
2
3
4
ADCD
DIP SWITCH SETTNGS
FOR HUMIDISTAT ONLY OPER ATION
ON
OFF
OFF
ON
3.6.4 Safety and High Limit Switches
Remove the jumper between terminals AB-AB and connect any simple high-limits, air flow switch, 12500 pressure switch, and
remote contacts in series to terminals AB-AB; otherwise, if no such dry contacts are available, the jumper must remain in place
between terminals AB-AB. DO NOT apply any voltage to AB-AB.
Thread the control wiring through the bottom of the unit, and the strain relief (see photo at top of previous page), and then up the
side of the control module to the top right wiring terminal blocks. Connect the control wiring to the control wiring terminal blocks
found at the top right side of the control module.
3.6.5 Air Conditioner Relay Interlock
Auxiliary DPDT safety relay: Use this method in the following situations:
1. To prevent the air conditioner from running when there is a call from humidity. The DPDT relay will open the “Y” circuit and close
the “G” circuit for operation while a call for humidity is present. Demand for humidity will override call for cooling.
2. In systems using a thermostat where G and Y are a single circuit. The DPDT relay will allow blower operation to occur without
back-feeding the compressor.
Do not use this method when simultaneous humidification and cooling will be desired. Use a high limit humidistat in to avoid
condensation in ductwork.
The humidistat should be set to OFF during the air conditioning season if humidification is not desired.
For variable speed or DC systems, consult furnace manufacturer .
PRESSURE
SWITCH
EXTERNAL
REGULATOR
Fig. 3.w
Fig. 3.x Fig. 3.y
Fig. 3.z