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XT SERIES INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Humidifi er wiring
CONNECTION INSTRUCTIONS
Before connecting power, refer to the wiring diagram or the data plate on the
outside of the cabinet for wire sizing amperage.
For control signal wiring from a humidistat, transmitter, or signal by others, see
the wiring diagrams shipped inside the humidifi er.
See “Step 1 – Field wiring” in the Vapor-logic Installation and Operation
Manual for detailed instructions on the following:
• Control input wiring:
See the “Control input” section.
• Duct airfl ow proving switch and duct high limit humidistat wiring
(recommended optional devices):
See the following sections:
“Airfl ow proving switch” and
“Duct high limit switch or transmitter”
• Remote signal wiring:
See the following sections:
“Programmable triac” and
“Programmable relay (dry contact)”
EARTH GROUNDING REQUIREMENTS
A code-approved safety earth grounding system is required. The ground
connection must be made with solid metal-to-metal connections. Ground wire
should be the same size as power wiring.
UNITS WITH STEAM BLOWER
Steam blowers (SDUs) receive power for operation from the XT series
humidifi er. Install 2 fuses in the XT unit to provide power to the steam blower.
Fuses are shipped with the steam blower. Replacements available from
DriSteem.
WARNING
Excessive moisture hazard
DriSteem strongly recommends
installing a duct airfl ow proving switch
and a duct high limit humidistat. These
devices prevent a humidifi er from
making steam when there is low airfl ow
in the duct or when the RH level in the
duct is too high. Failure to install these
devices can result in excessive moisture
in the duct, which can cause bacteria
and mold growth or dripping through
the duct.
Proper wiring prevents electrical noise.
Electrical noise can produce undesirable effects
on electronic control circuits, which affects
controllability. Electrical noise is generated
by electrical equipment, such as: inductive
loads, electric motors, solenoid coils, welding
machinery, or fl uorescent light circuits. The
electrical noise or interference generated from
these sources (and the effect on controllers)
is diffi cult to defi ne, but the most common
symptoms are erratic control or intermittent
operational problems.
Important:
• For maximum EMC effectiveness, wire all
humidity, high limit, and airflow controls
using multicolored shielded/screened
plenum-rated cable with a drain wire for
the shield/screen. Connect the drain wire
to the shield/screen ground terminal with
wire less than 2" (50 mm) in length.
• Do not ground shield at the device end.
INSTALLATION
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