DriSteem Vapor-Logic Guía de instalación descargar pdf (Pagina 5)

Figure 5-1: Recommended Placement of Humidistat Control or Humidity and Temperature Transmitters

Temperature compensation transmitter

located on lower corner of the inside

surface of double pane window glass

North or North-

East Facing

Window

Air Handling Unit

Humidifier

AHU

Return Air

Relief Air

Outside Air

Point of Vapor Absorption

Vapor Absorption Has Taken

Place

Air Flow Switch (sail type recom-

mended for VAV application)

High Limit Humidistat or High Limit Transmitter (set at

90% RH max.) Placement for VAV Applications

metres)

Line

Voltage

24 Volt

Liquid Level Detectors

Electrical Supply

Key Pad

UL-listed IP 52

VAPORSTREAM

VLC Humidifier

Duct

ULTRA-

SORB

Recommended Sensor

Locations

A) Best

B) Alternative Location

C) Not Recommended

D) Best Duct High Limit Humidistat

PLACEMENT OF SENSING DEVICES

Sensing Device Placement

The location of the humidity sensing devices is very

important to achieve accurate humidity control. A

drawing of a typical small air handling system is shown

below (figure 5-1). For the best control, place the

humidity sensing device in the center of room, or just

inside of the return air duct (location “A”). This will

provide the least amount of variation caused by air flow

patterns and room temperature. Placement of the duct

humidity sensing device within outlet of air handler

(location “D”) is ideal for duct high limit control, but the

actual placement must be downstream from dispersion

tubes a sufficient distance to ensure steam absorption

has taken place. Accurate control of temperatures in

room and ducts is also very important to improve

control of relative humidity.

Control Precautions

Unsatisfactory results from humidifying control may

involve more than just the controller’s capability to

control the system. Other factors that play an important

role in overall system control are:

• Size of the humidification system relative to

load.

• Overall system dynamics associated with

moisture migration time lags.

• Accuracy of humidistats and humidity transmit-

ters and their location.

• Dry bulb temperature accuracy in space or

duct.

• Velocities and air flow patterns in ducts and

space environments.

• Electrical noise or interference.

OM-828

Volt

Liquid Level

Detectors

1 2 3 4 5 6 7 8 9 10 ... 51 52

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DriSteem Vapor-Logic Guía de instalación Pagina 5

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