DriSteem Vapor-Logic Troubleshooting Guide download pdf (Page 62)

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When a duct high limit option is ordered, DRI-STEEM provides

either a duct high limit switch or a duct high limit humidity

transmitter (4 to 20 mA output, 0 to 100% RH range) for duct

mounting.

Duct high limit switch option

The duct high limit switch prevents duct saturation by turning

off the humidifier when reaching the device set point. When this

occurs, a “Duct HL trip” message appears in the Messages Log and

autoclears when duct RH drops below the duct high limit set point.

Modulating high limit transmitter option

The modulating high limit transmitter operates in conjunction

with the room/duct controlling transmitter or demand signal

through the Vapor-logic4 control system to prevent excess

humidification in the duct. Vapor-logic4 starts lowering the

humidifier output when the duct relative humidity is within a user-

defined percentage (default is 5%) of the duct high limit set point.

This value is called the duct high limit span and is defined during

Setup.

When duct relative humidity enters this range, a “Duct HL span”

message appears in the Messages Log and the Message label lights

on 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. If this occurs, a “Duct HL

trip” message appears in the Messages Log.

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

Vapor-logic4 slowly starts to increase steam production. When

the duct relative humidity decreases to greater than the defined

percentage below the duct high limit set point, the control

transmitter or signal by others demand signal is restored as

the primary controller, returning the control system to normal

operation, and the messages in the Messages Log automatically

clear.

Temperature compensation control option

Note: This option is not applicable for XT humidifiers.

When selected as an option, DRI-STEEM provides a temperature

compensation transmitter. The temperature compensation

transmitter continually monitors interior window glass

temperature and transmits this temperature to Vapor-logic4.

Vapor-logic4 assumes a 70 °F (21 °C) room temperature and uses

the glass temperature and the RH in the space being controlled to

calculate the dew point (°F or °C) for the space.

Operation

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DriSteem Vapor-Logic Troubleshooting Guide Page 62

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