29
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
The control cabinet should be mounted in a location convenient for service with
a minimum of 36" (914 mm) clearance in front of the door.
The installer is responsible for making electrical connections at the power
terminals.
CONTROL WIRING
The following wiring methods for external low-voltage control wiring should
minimize electrical noise problems:
•
Humidistat, RH transmitter, and temperature transmitter wiring must be
minimum 18-gauge (1 mm
2
) plenum rated, shielded (screened), twisted pair
wire with a bare drain wire for grounding.
•
Airfl ow proving switch wiring must be minimum 18-gauge (1 mm
2
) stranded
wire run in conduit. The airfl ow proving switch can be wired using minimum
18-gauge (1 mm
2
) plenum rated, shielded (screened), twisted pair wire with
a bare drain wire for grounding.
•
The shield (screen) wire should be connected to the shield (screen) ground
terminal/lug with a length less than 2" (51 mm). Do not ground the shield
(screen) wire on the humidistat or transmitter end.
•
Water level control device, fi ll valve, and drain valve wiring must be
minimum 18-gauge stranded wire run in a separate conduit from power
wires. DO NOT USE SHIELDED (SCREENED) CABLE FOR WATER LEVEL
CONTROL DEVICES.
•
The tank temperature sensor can be run with 18-gauge (1 mm
2
) stranded
wire if the control cabinet is located within 10' ( 3 m) of the humidifi er. For
wire lengths of 10' to 50' (3 m to 15 m), use 18-gauge (1 mm
2
) plenum
rated, shielded (screened), twisted pair wire with a bare drain wire for
grounding.
GROUNDING REQUIREMENTS
The approved earth ground must be made with solid metal-to-metal connections
and must be a good conductor of radio frequency interference (RFI) to earth
(multistranded conductors).
Ground wire should be the same AWG (mm
2
) size as the power wiring or
sized per NEC requirements (in Europe, IEC 60364 requirements).
When the control cabinet is mounted remotely from the humidifi er, a ground
wire is necessary from the machine ground lug on the humidifi er to the
machine ground lug in the control cabinet. The bonding machine ground wire
should be no less than 14-gauge AWG (mm
2
) or sized per NEC or IEC 60364
requirements.
Important:
Failure to follow these wiring
procedures can result in erratic operation or
failure.
This product has been tested at the factory for
proper operation. Product failures resulting from
faulty handling, incorrect wiring, or shorting of
wires together on external components are not
covered under your DriSteem warranty. Review
information and diagrams before proceeding.
Wiring
INSTALLATION
