Honeywell Steam Humidifier Professional Installation Manual page 65

B: Advanced Steam Humidifier Wiring
OPTION 12: VisionPRO IAQ controlling 2 Steam Humidifiers
FURNACE
1 THE YTH9421C1002 KIT INCLUDES THE TH9421C1004 VISION-PRO IAQ THERMOSTAT AND
THE THM5421C1008 EQUIPMENT INTERFACE MODULE. THE TH8320R1003 KIT INCLUDES
THE TH942C1004 VISION-PRO IAQ THERMOSTAT, THM5421C1008 EQUIPMENT INTERFACE
MODULE, AND C7089U1006 OUTDOOR SENSOR.
A DOUBLE-POLE RELAY SUCH AS THE R8228D1018 IS REQUIRED.
2
AN AIR-FLOW SWITCH IS RECOMMENDED. IF AN AIR FLOW SWITCH IS NOT USED THERE
3
DOES NOT NEED TO BE A WIRE ATTACHED TO C ON THE STEAM HUMIDIFIER AND THE #4
DIP SWITCH NEEDS TO BE SET TO "ON".
GT IS NOT REQUIRED FOR THIS APPLICATION. SINCE THE VISIONPRO IAQ THERMOSTAT
4
DOES NOT HAVE A Y/G INTERCONNECT, PARALLEL WIRING CAN BE DONE (AS SHOWN).
HM609 OR HM612 STEAM HUMIDIFIER CAN BE USED.
5
CONFIGURE THE THERMOSTAT TO HUMIDIFY INDEPENDENT OF FAN (INSTALLER SETUP
6
374 SET TO 3).
Steam Humidifier System 69-2285—09
1 6
TH9421C1004
AFS
3
2
4
STEAM HUMIDIFIER 1
COMMUNICATION LED
COMMUNICATION
TERMINALS
24 VAC
THM5421C1008
1
On
4
Off
STEAM HUMIDIFIER 2
5
1
2 3 4 5
6
AFS Monitor Recommended
M32914A
M33057
63