Honeywell TrueSTEAM HM612A1000/U Installation Manual page 33

IMPORTANT NOTE: The images below are not complete wiring diagrams. It only depicts power monitoring and
is not meant to be a stand alone diagram. Please refer to the "Wiring the steam humidifier" section in the following
pages for complete wiring diagrams.
Steam
Humidifer
HUM
HUM
1 2 3 4 5 6
On
Off
Humidity Control
HUM
HUM
Steam Humidifier System 69-2285—11
Thermostat with
Humidity Control
HVAC System
1
2 3
R
C
Steam Humidifier
HVAC System
R
C
1 2 3 4 5 6
On
Off
WIRING BASICS: CONFIGURATION 1
When using a thermostat with integrated
humidity control (such as VisionPRO IAQ
or Prestige):
• The thermostat is powered by the system
transformer. In this configuration, the
thermostat must have power or steam
humidifier will not be able to
produce steam.
• Because the thermostat knows when the
system transformer has power, set DIP 4
to UP, so that it is not looking for an R input
from the system R.
• If Thermostat is NOT POWERED by the
M29615A
system transformer, it is required to monitor
the R input. Leave DIP 4 DOWN. (factory
setting)
WIRING BASICS: CONFIGURATION 2
When using a humidistat separate from the
thermostat (such as H6062 or TrueIAQ):
• Steam humidifier generally supplies power
to the humidistat. In this configuration,
steam humidifier must monitor HVAC
system power to determine if humidity is
allowed.
• Leave DIP 4 in the DOWN position (factory
setting), and wire the HVAC system R and
M29616B
C to the steam humidifier R and C. Steam
humidifier will verify power is present
before allowing steam production.
31