DriSteem HUMIDI-TECH DI Installation Guide download pdf (Page 5)

DRI-STEEM Vapor-logic

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Accurate, responsive microprocessor control

Vapor-logic

provides comprehensive control for DRI-STEEM

humidifiers. With extensive capabilities and easy-to-use keypad, the

Vapor-logic

efficiently controls all humidifier functions.

Navigating the keypad to adjust or review humidifier functions is an

intuitive process of walking through easily read screen menus.

You will find no other controller in the humidifier market able

to provide such functionality, ease of use, and accurate relative

humidity (RH) control.

Control options

t On-off control: Vapor-logic

uses a humidistat to enable

single-staged or multiple-staged electric outputs.

Expected accuracies: ± 5% to 7% RH

t Time proportioned (TP) control: Vapor-logic

directly reads

space RH and uses a proportional, integral, derivative (PID) loop

to vary the duty cycle of humidifier outputs to the solid state relay

(SSR) power controllers or contactors.

Expected accuracies:

– Contactor action: ± 2% to 4% RH

– SSR action: ± 1% to 3% RH

t Modulated control: Vapor-logic

directly reads space RH and

uses a PID loop to control modulating steam or hot water valves

(on STS or LTS) or GTS burners by providing a linear analog

signal to the combustion air blowers.

Expected accuracies: ± 2% to 5% RH

t Control signal by others: Vapor-logic

accepts an analog control

signal from another controller that directly determines the output

of the humidifier.

Expected accuracies: Determined by external control system

t LonTalk® interoperability: Allows communication with a

LonTalk building automation system using Standard Network

Variable Types (SNVTs or “snivits”).

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DriSteem HUMIDI-TECH DI Installation Guide Page 5