Honeywell THX9000 Prestige HD Installation Manual page 7

System-specific wiring guides
Humidification systems
Steam humidifier (or any humidifier with
its own transformer)
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]
[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.
[3, 4]
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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]
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
7
See [notes] below.
See [notes] below.
[8, 9]