TrueSTEAM Humidification System
9 69-2285EFS—03
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system fan regulation is a configuration that allows TrueSTEAM to monitor the HVAC sys-
tem’sfanoperation,andensurethatthefanisonif humidityisneeded.Airflowisneededtodis-
tributehumidityintothelivingspace,andpreventcondensation fromformingintheduct.
Therearetwowayssystemfanoperationcanbe configured,dependingonwhathumiditycon-
trol is used.
1. using a thermostat with integrated humidity
control, such as Visionpro Iaq or prestige.
• Athermostatcontrolsthefanandhumidifier,so
the control will not allow steam production without
turning the system fan on.
• WirethermostatGtotheHVACsystemGasnormal.
Wire TrueSTEAM HUM terminals to the system HUM
terminals.
Ideal for contractors Who
- Want integrated control of the humidifier and HVAC system in the living space.
- Want the system fan to turn on immediately upon a call for humidity.
2. using a humidistat separate from the thermostat,
such as h8908 or trueIaq.
• Externalhumiditycontrolsdonotmonitororcontrolthe
systemfan,soitiscriticalthatTrueSTEAMensuresthe
fan has power before allowing humidity.
• BreakthethermostatGtoHVACsystemGconnection.
Wire thermostat G to TrueSTEAM GT. Wire TrueSTEAM
GF to HVAC system G.
Thermostat G calls will pass through TrueSTEAM
unhindered.Ifthissignalisnotpresent,andhumidity is
needed,TrueSTEAMwillrelaypowerfromitsRTterminal
to GF and out to HVAC system G to ensure the fan has power for humidity calls
Ideal for contractors Who
- Use a humidity control separate from the thermostat.
- Wish to avoid excessive air circulation in the home. TrueSTEAM fan calls will not be sent
out of GF until the water temperature reaches 170°F (just before boiling).
note: This feature can be used with VisionPRO IAQ as well. See page 13.
M28686
G
HUM
HUM
HUM, G
SIGNAL
1
2
31
2
3
M28687
R
RT
GF G
G
GT
IF THERMOSTAT G SIGNAL IS NOT PRESENT, THEN THE
TrueSTEAM GF TERMINAL WILL ENERGIZE THE HVAC G
TERMINAL TO TURN ON FAN.
R
HUM
HUM
1
1
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note: This image is not a complete wiring diagram.
It only depicts fan regulation.
note: This image is not a complete wiring diagram.
It only depicts fan regulation.