Honeywell Steam Humidifier Professional Installation Manual page 66

B: Advanced Steam Humidifier Wiring
OPTION 13: Prestige IAQ controlling 2 Steam Humidifiers
64
THM5421R1005
IAQ
DEVICE
SENSOR TYPE
2
1 3 4 5
ON
OFF
AFS MONITOR RECOMMENDED
A DOUBLE-POLE RELAY SUCH AS THE R8228D1018 IS REQUIRED.
1
AN AIR-FLOW SWITCH IS RECOMMENDED. IF AN AIR FLOW SWITCH IS
2
NOT USED THERE DOES NOT NEED TO BE A WIRE ATTACHED TO C ON
THE STEAM HUMIDIFIER AND THE #4 DIPSWITCH NEEDS TO BE SET TO
"ON".
GT IS NOT REQUIRED FOR THIS APPLICATION. SINCE THE PRESTIGE IAQ
3
THERMOSTAT DOES NOT HAVE A Y/G INTERCONNECT, PARALLEL WIRING
CAN BE DONE (AS SHOWN).
HM609 OR HM612 STEAM HUMIDIFIERS CAN BE USED.
4
THE U1, U2, OR U3 CONTACTS CAN BE CONFIGURED TO CONTROL A
5
HUMIDIFIER. IN THIS DIAGRAM THE 1 TERMINALS ARE USED.
CONFIGURE THE THERMOSTAT TO HUMIDIFY INDEPENDENT OF FAN
6
(INSTALLER SETUP 374 SET TO 3).
THX9421R5005
5
6
5
3
6
STEAM
HUMIDIFIER 1
FURNACE
AFS
1
2
3
4 STEAM
HUMIDIFIER 2
M33058B
Steam Humidifier System 69-2285—09