DriSteem Vaporstream Specifikace stáhnout pdf (Strana 38)

VAPORSTREAM INSTALLATION, OPERATION, AND MAINTENANCE MANUAL

INSTALLATION

Sensor placement

Other factors affecting humidity control

Humidity control involves more than the

controller’s ability to control the system. Other

factors that play an important role in overall

system control are:

• Size of humidiﬁcation system relative to load

• Overall system dynamics associated with

moisture migration time lags

• Accuracy of humidistats and humidity

transmitters and their location

• Dry bulb temperature accuracy in space or

duct

• Velocities and airﬂow patterns in ducts and

space environments

• Electrical noise or interference

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SENSOR LOCATION IS CRITICAL

Sensor location has a signiﬁcant impact on humidiﬁer performance. See the

recommendations below.

Note: DriSteem recommends that you do not interchange room and duct

humidity devices. Room humidity devices are calibrated with zero or

little airﬂow, whereas duct humidity devices require air passing across

them.

Recommended humidity control (transmitter/humidistat) locations:

A. Ideal. Ensures the best uniform mix of dry and moist air with stable

temperature control.

B. Acceptable, but room environment can affect controllability, such as when

sensor is too close to air grilles, registers, or heat radiation from room

lighting.

C. Acceptable. Provides uniform mixture of dry and moist air. If extended time lag exists between humidity generation

and sensing, extend sampling time.

D. Acceptable (behind wall or partition) for sampling entire room if sensor is near an air exhaust return outlet. Typical

placement for sampling a critical area.

E. Not acceptable. These locations might not represent actual overall conditions in the space.

F. Not acceptable. Do not place sensors near windows, door passageways, or areas of stagnant airﬂow.

Recommended safety (airﬂow and high limit) sensor location:

G. Best sensing location for high limit humidistat or humidity sensor and airﬂow proving switch.

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DC-1084

Outside air

Relief air

Return air

Air handling

unit

8' to 12'

(2.4 m to 3.7 m)

min.

Humidiﬁer dispersion assembly

Turning vanes

Window

Doorway

Window

Point of vapor absorption

Vapor absorption has taken place

Airﬂow switch or differential pressure switch

(sail type recommended for VAV applications)

High limit humidistat or high limit transmitter (set at 90% RH maximum)

for VAV applications

Damper control

Wall or partition

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Temperature compensation option: Place a temperature compensation sensor on

the lower corner of the inside surface of double-pane window glass on north- or

northeast-facing window.

FIGURE 34-1: RECOMMENDED SENSOR LOCATIONS

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 79 80

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