28
STS INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
Wiring
INSTALLATION
Brown or black, top probe rod (full water condition)
Orange or white, middle probe rod (refi ll water condition)
Violet or red, bottom probe rod: Low water condition,
tap/softened water
TOP
MID
LOW
WIRING DIAGRAM LOCATIONS
•
Ladder style wiring diagrams (located inside control cabinet door)
show power, control, and humidifi er-to-control-cabinet interconnection
requirements.
•
External connections diagrams (located inside control cabinet door) show
connection points to the microprocessor-based controller and wire terminals
for the following external safety and control devices: airfl ow proving
switches, high limits, transmitters, or humidistats.
All wiring must be in accordance with all governing codes and with STS wiring
diagrams.
ELECTRICAL INSTALLATION
Wiring and branch circuit protection is provided by the installer per the
National Electrical Code (NEC) or in Europe, IEC 60364. For power supply
and machine ground connections, size the wire using the 75 °C wiring table,
per the NEC (or IEC 60364). Then use copper conductors rated for a 105 °C
environment. The wiring from the control cabinet to the humidifi er must be
rated for 105 °C.
All STS humidifi ers have a 120V, single phase electrical supply for North
America or 230V, single phase electrical supply for Europe. Verify current
characteristics and capacity requirements against those listed on the name
plate.
WIRING REQUIREMENTS
The length of wire from the control cabinet to the humidifi er must not exceed
50' (15 m). Run control wiring in dedicated, earthed, metal conduit or cable
trays or trunking that is separated from the building’s power wiring.
Notes:
• See Outdoor Enclosure electrical
specifi cations in Table 13-2.
• Damage caused by chloride corrosion is not
covered by your DriSteem warranty.
CAUTION
Damage from debris
When drilling penetrations in the
control cabinet, protect all internal
components from debris, and vacuum
out the control cabinet when fi nished.
Failure to comply with this directive
can damage sensitive electronic
com po nents, cause erratic operation
or failure, and void your DriSteem
warranty.
WARNING
Electric shock hazard
Only qualifi ed electrical personnel
should perform fi eld wiring installation
procedures. Improper wiring or contact
with energized circuits can cause
property damage, severe personal
injury, or death as a result of electric
shock and/or fi re.
Do not open control cabinet until
electrical power is disconnected.
FIGURE 28-1: WATER LEVEL CONTROL WIRING FOR VAPOR-LOGIC