DriSteem Vapor-Logic Guide d'installation télécharger pdf (Page 10)

SENSING DEVICE PLACEMENT AND WIRING

Window framing

OM-337

Figure 10-1: Cold snap transmitter placement

Thermostat control wires

Surface mounting

thermostat temperature

control box to wall

Typical sensor

umbilical cord routing

Temperature sensor tip, secured to inside surface of window

glass using clear RTV silicone adhesive around tip

Double pane window glass

PROPER WIRING PROCEDURES

Electrical "noise" is generated by electrical equipment,

such as switching loads, electric motors, solenoid coils,

welding machinery, fluorescent light circuits, etc. These

stray electrical currents can produce undesirable effects in

the electronic control circuits that eventually can affect

controllability. The electrical "noise" or interference

generated from these sources (and the effects on control-

lers) is very difficult to define, but most common symp-

toms are erratic operation or intermittent problems.

Most noise problems can be prevented by using wiring

practices and techniques which do not allow coupling or

inducing of electrical interference into control circuits.

These simple wiring practices associated with

DRI-STEEM humidifier equipment should minimize

interaction of noise and controls:

• Humidifier and control cabinets must be

connected to a code approved earth ground.

• When routing electrical wiring inside the control

cabinet, separate line voltage wiring from low

voltage control circuit wiring.

• Use separate electrical conduits for line and

low voltage wiring from the humidifier to

humidity sensors, airflow switches, etc.

• Do not mix chassis or safety grounds with

current carrying commons. No safety grounds

should ever be used as a conductor or neutral

to return circuit current.

• The preferred method of external electrical

connections to humidistats, room/duct

humidity and temperature transmitters, and

control signal input connections from building

control systems is minimum #18 gauge plenum

rated wire cable of twisted pair type, BELDEN

#88760, including cable shielding and drain wire

for grounding.

• All grounding of shielded cable connections

should be returned to the control cabinet

and tied to the earth ground point. Do not

ground shield at the device end.

NOTE: Do not use shielded cable for probe wiring.

Individual #18 gauge stranded is recommended.

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DriSteem Vapor-Logic Guide d'installation Page 10

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