Install Instructions

WIRING

You will need to wire TrueSTEAM using the diagram that applies to your humidity control. Remember to

include the wiring and DIP settings required for power monitoring, system fan regulation, and add-on air

proving (if used).

Using the Terminals

Wiring the TrueSTEAM

Use the terminals (found inside the cover) to

wire TrueSTEAM to the humidity control and the

HVAC system.

RedLINK Wireless Terminals

A – Hot

B – Send signal

C – Receive signal

D – Common

Note: If using wireless control, set DIPs 3 and 4 to the UP position.

Low-voltage Terminals

24V – Output voltage

HUM – Low-voltage terminals for humidity control.

C, R – Inputs from HVAC system transformer.

GT, GF – GT input is from thermostat G. GF output

goes to HVAC system G.

RT – Connects to thermostat R terminal, which is

normally switched to call for fan.

EXT – When a 24-vac fan board is not used to control

blower (hydronic or cooling-only applications), this

connection with GF provides dry-contact closure for

fan calls. EXT/GF may be wired to a low-voltage relay

control center to provide line-voltage fan control.

Route wires through the raised tabs and out the notch

at the rear of the chassis.

Make sure the wires are secure and do not interfere

with the cover assembly.

Routing the Wires

24V

HUM

EXT

M29620

TrueSTEAM Humidication System 69-2285—05

M29621