Install Instructions
WIRING
Follow the diagram for control options 1 through 14 to wire the TrueSTEAM. Refer to the installation manual
provided with the control for additional instructions if needed.
OPTION 1: Dry-contact Mechanical
Humidistat Wiring
1
Make sure that the thermostat used
isolates Y from G. All Honeywell Prestige,
VisionPRO IAQ, VisionPRO, and Focus Pro
thermostats do this.
HVAC
RECOMMENDED
AIR FLOW SWITCH (AFS)
HumidiPRO
THERMOSTAT
C
R
U
U
S
S
GYWRRc
GYWR C
24V
24V
HUM
HUM
C
GT
R
RT
GF
EXT
M34831
Tr ueSTEAM
Setting
Light
Auto
Next Auto
System
%
Inside
%
HUMIDITY BOOST
OUTDOOR
SENSOR
(OPTIONAL)
1
Using the Correct Control Diagram
CAUTION: Voltage Hazard.
Before wiring to HVAC terminals, disconnect HVAC equipment power. Make sure TrueSTEAM
is not plugged in.
6
543
2
On
Off
1
AFS Monitor Recommended
M32913
NOTE: Advanced Wiring diagrams are shown in Appendix B
beginning on page 56.
TrueSTEAM Humidication System 69-2285—05
35