Using The Terminals; Routing The Wires - Honeywell Steam Humidifier Professional Installation Manual

Wiring the Steam Humidifier
You will need to wire steam humidifier 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

M29620

Routing the Wires

34
A
B
C
D
2 4 V
2 4 V
H U M
H U M
C
G T
R
R T
G F
E X T
2
MCR29621
Use the terminals (found inside the cover) to
wire steam humidifier 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.
1
Make sure the wires are secure and do not interfere
with the cover assembly.
Steam Humidifier System 69-2285—09