DriSteem HUMIDI-TECH DI Guide d'installation télécharger pdf (Page 32)

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Installation and Operation Manual

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Variable air volume (VAV) option

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

of your program code configuration string (for example:

EV11400285A7

VOX). See Pages 32-33 for more information about

the program code configuration string.

When the VAV control option is requested, DRI-STEEM provides a

duct mounted humidity transmitter (4 to 20 mA output, 0 to 100%

RH range). Install using shielded cable (see Figure 28-1).

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. Vapor-logic

starts lowering the

humidifier output when the duct relative humidity is within 6% of

the duct high limit set point.

When this occurs, the message “VAV output limit” appears in the

keypad/display. If necessary, the reduction of the humidifier output

continues until maximum high limit set point is reached, shutting

off the humidifier completely.

When the high relative humidity starts to decrease in the duct,

Vapor-logic

slowly starts to increase the production of steam vapor.

When the duct relative humidity decreases to greater than 6% below

the duct high limit set point, the control transmitter is restored as

the primary controller, and the “VAV output limit” text no longer

appears in the keypad/display, returning the control system to

normal operation.

Figure 28-1:

VAV transmitter wiring

OM-2027d

Place shunt across

“I˝ pins of J15/18

when connecting

a 4-20 mA VAV

transmitter. See

Page 13 for more

information about

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J15/18

0 – 15 VDC

0 – 20 mA

0 – 150 ohm

RIV

OM-4030

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