DriSteem Vapor-logic3 Instrucciones de operaciones descargar pdf (Pagina 23)

Installation

Wiring VAV sensing device.

Variable air volume (VAV) option

This option is identified as a “V” in the third-from-last

place of your program code nomenclature (for

example: EV11400285A7VOX).

When the VAV control option is requested we provide

a duct mounted humidity transmitter (4-20 mA output

over 0-100% RH range). Install using shielded cable

(see Figure 21-1 below).

The modulating high limit transmitter signal operates

in conjunction with the room or duct controlling

transmitter signal through the VAPOR-LOGIC

control system to prevent over humidification in the

duct work. VAPOR-LOGIC

will start lowering the

humidifier output when the duct relative humidity is

within six percent of the duct high limit set point.

Figure 21-1: Shielded cable

NOTE: Ground shield at control panel end only.

Do not ground shield at device end.

When this occurs, the keypad/display will show the

message “VAV output limit.” If necessary, the

reduction of the humidifier output will continue until

maximum high limit set point has been reached,

shutting off the humidifier completely.

When the high relative humidity starts to decrease in

the duct, VAPOR-LOGIC

will slowly start to

increase the production of steam vapor. When the

duct relative humidity decreases to a point greater

than six percent below the duct high limit set point,

the control transmitter will be restored as the primary

controller and the keypad/display will no longer

show the “VAV output limit” text, returning the

control system to normal operation.

Installation:

Wiring VAV sensing device

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DriSteem Vapor-logic3 Instrucciones de operaciones Pagina 23