DriSteem Vapor-Logic Troubleshooting Guide download pdf (Page 81)

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Multi-tank mode defined

In multi-tank mode, one Vapor-logic4 controller can control multiple

humidifier tanks, and tanks in a multi-tank system can vary by energy

source and capacity.

A multi-tank system has one master controller controlling up to 16

slave tanks. The master controller receives the demand signal and

controls slave tank steam production based on

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The master controller also gives permission to slave humidifier tanks

to perform functions, such as draining and flushing.

The master controller must be

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Multi-tank control interface

Most systems have one Vapor-logic4 keypad per multi-tank group.

This keypad ships with the tank that has the master control board. The

keypad (or the Web interface; see note below) can be connected to any

humidifier in the multi-tank group. Maximum cable length from the

keypad to any control board in the multi-tank group is 500' (152 m).

Note: Multi-tank groups can also be operated using the Web interface.

See “Multi-tank operation with Web interface” on Page 81.

Operation

Start-up order and trim tanks

All humidifier tanks in a multi-tank group are factory-assigned to a

priority group. There are four priority groups: 0, 1, 2, and 3.

Priority groups identify tank function as follows:

0 = Trim tanks 2 = Priority 2 tanks (peak)

1 = Priority 1 tanks (load) 3 = Redundant tank

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Tanks in priority group 0 are brought online first, followed by tanks

in priority group 1, then 2. Priority group 3 designates an optional

redundant tank, which comes online only if a tank in the system is

unavailable and the remaining tanks cannot meet capacity.

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A trim tank is assigned to priority group 0 and is brought online

first — always before tanks in priority groups 1, 2, or 3. The trim tank

modulates continuously, responding to system demand changes.

Multi-tank groups requiring a rapid response to changes in system

demand typically have an electric element humidifier with SSR

control as the trim tank.

Staging multiple XT humidifiers

XT humidifiers do not operate in multi-tank

mode; however, up to four XT humidifiers can

be staged to operate in sequence.

See “Staging multiple XT humidifiers” on

Page 37.

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DriSteem Vapor-Logic Troubleshooting Guide Page 81

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