Honeywell TrueSTEAM Professional Installation Manual page 11

system fan regulation
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.
is a configuration that allows TrueSTEAM to monitor the HVAC sys-
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.
9
TrueSTEAM Humidification System
WIrInG–GettInG started
1
2
3
HUM
HUM
1 IF THERMOSTAT G SIGNAL IS NOT PRESENT, THEN THE
TrueSTEAM GF TERMINAL WILL ENERGIZE THE HVAC G
TERMINAL TO TURN ON FAN.
HUM, G
SIGNAL
1
G
2
3
HUM
HUM
M28686
G
1
GT
R R
RT
GF G
M28687
69-2285EFS—03