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7
System-specific wiring guides
Humidification systems
Bypass, flow-through humidifier (or
any humidifier that uses the system
transformer) [3]
Rc Power [1]
R [R+Rc joined by jumper] [2]
HUM1Field jumper R to HUM 1 [5]
HUM2Humidifier 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.
Steam humidifier (or any humidifier with
its own transformer) [3, 4]
Rc Power [1]
R [R+Rc joined by jumper] [2]
HUM1Humidifier relay [5]
HUM2Humidifier relay [5]
See [notes] below.
Dehumidification systems
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]
Whole house dehumidifier [6]
Rc Power [1]
R [R+Rc joined by jumper] [2]
DHM1Dehumidifier relay [5]
DHM2Dehumidifier relay [5]
See [notes] below.
