Honeywell THX9000 own, HUM1, HUM2, DHM1, DHM2, HUM1, HUM2, DHM1, DHM2, notes, notes, Steam humidifier, A/C with low-speedfan [7], Whole house dehumidifier [6]

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System-specific wiring guides

Humidification systems

Steam humidifier (or any humidifier with its own transformer) [3, 4]

Rc Power [1]

R[R+Rc joined by jumper] [2] HUM1 Humidifier relay [5] HUM2 Humidifier relay [5]

Dehumidification systems

Whole house dehumidifier [6]

Rc Power [1]

R[R+Rc joined by jumper] [2] DHM1Dehumidifier relay [5] DHM2Dehumidifier relay [5]

See [notes] below.

Bypass, flow-through humidifier (or any humidifier that uses the system transformer) [3]

Rc Power [1]

R[R+Rc joined by jumper] [2] HUM1 Field jumper R to HUM 1 [5] HUM2 Humidifier relay [5]

See [notes] below.

A/C with low-speed fan [7]

Rc Power [1]

R[R+Rc joined by jumper] [2] DHM1Field jumper Rc to DHM 1 [8] DHM2Dehumidifier relay [8, 9]

[1]	Power supply. Provide disconnect means and overload protection as required.
[2]	Remove jumper (R to Rc) for systems with two transformers. Common connection
	must come from cooling transformer.
[3]	If using a humidifier that is wired directly to the thermostat, set humidification control
	to Wired in Installer Setup.
[4]	If using a wireless adapter (THM4000R) with a TrueSTEAM humidifier, set humidification
	control to Wireless in Installer Setup. Connect nothing to thermostat HUM terminals.
[5]	Terminals are normally open dry contacts.
[6]	In Installer Setup, set	dehumidification setting to Whole House Dehumidifier.
[7]	In Installer Setup, set	dehumidification setting to Dehumidify with Air Conditioner.
[8]	Terminals are normally closed dry contacts.
[9]	Equipment must include dehumidification terminal for low-speed fan.

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