Using The Correct Control Diagram - Honeywell TrueSTEAM Guide D'installation

Using the Correct Control Diagram

CAUTION: Voltage Hazard.
Before wiring to HVAC terminals, disconnect HVAC equipment power. Make sure TrueSTEAM
is not plugged in.
Follow the diagram for control options 1 through 5 to wire the TrueSTEAM. Refer to the installation manual
provided with the control for additional instructions if needed.
1
Thermostat
TrueSTEAM
H8908
HUM
HUM
Thermostat
TrueIAQ TrueSTEAM
2
R 24V
C 24V
HUM
HUM
20
R
C
W
Y
G
GT
R
C
GF G
1 2 3 4 5 6
On
Off
HVAC System
R
1
C
W
Y
G
GT
R
C
GF G
1 2 3 4 5 6
On
Off
HVAC System
OPTION 1: Dry-contact Mechanical
Humidistat Wiring
Make sure that the thermostat used
1
isolates Y from G. All Honeywell Prestige,
VisionPRO IAQ, VisionPRO, and Focus Pro
thermostats do this.
M29622
OPTION 2: TrueIAQ Wiring
Make sure that the thermostat used
1
isolates Y from G. All Honeywell Prestige,
VisionPRO IAQ, VisionPRO, and Focus Pro
thermostats do this.
For the TrueIAQ Installer Setup, set ISU
2
#25 to 3.
M29623
TrueSTEAM Humidification System 69-2285EF—01