13
Figure 13-1: Probe wiring
Installation:
Wiring techniques
Proper wiring procedures (cont.).
Installation
Proper wiring prevents electrical noise (cont.)
Do not use chassis or safety grounds as current-
carrying commons. No safety grounds should ever
be used as a conductor or neutral to return circuit
current.
When wiring external electrical connections to
humidistats, room/duct humidity and temperature
transmitters, or control signal input connections
from a building control system, use 1 mm
2
(minimum) plenum-rated twisted-pair wire, Belden
No. 88760, with cable shielding and drain wire for
grounding.
Return all shielded cable connections to the
control cabinet for grounding. Do not ground
shield at the device end.
IMPORTANT
: Locate the control cabinet so
that wire lengths are 15 m or less to the humidifier.
Use 1 mm
2
stranded wire run in conduit (see
Figure 13-1) for probe and low-water cut off
wiring.
IMPORTANT
: Do not use shielded cable
for probe wiring.
Brown (full) top probe rod Level A
Orange (refill) middle probe rod Level B
Violet (low water) bottom probe rod Level C
or DI model low-water cutoff switch
Probe wiring to be
1 mm
2
stranded wire
run in conduit
independent of line
voltage wiring.
Do not use shielded
cable for probe
wiring.
OM-VL3-11
VL3-IOM-0301-METRIC.pdf 17
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