DriSteem Vapor-logic3 Instrucciones de operaciones descargar pdf (Pagina 18)

Sensing devices and humidity control.

Installation

Important to properly place sensing devices

Humidity sensing devices must be properly placed to

achieve accurate humidity control. A typical small air

handling system is shown in the drawings on Pages

17 and 18 (Figures 17-1 and 18-1). For the best

control, place the humidity sensing device in the

center of a room, or just inside the return air duct

(location “A”). These locations will provide the least

amount of variation caused by air flow patterns and

room temperature. Placement of the duct humidity

sensing device within the outlet of the 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 rooms and ducts is also very

important to improve control of relative humidity.

Other factors that affect humidity control

Unsatisfactory humidity 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

transmitters 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

Installation:

Sensing devices and humidity control

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DriSteem Vapor-logic3 Instrucciones de operaciones Pagina 18