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VAPOR-LOGIC
®
VERSION 6 INSTALLATION AND OPERATION MANUAL
Multiple-tank operation
MULTI-TANK MODE DEFINED
In multi-tank mode, one Vapor-logic 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 8 slave tanks. The master controller receives the demand
signal and controls slave tank steam production based on
• priority group,
• wear leveling,
• fault status.
The master controller also gives permission to slave humidifier tanks to perform functions, such as draining and flushing.
The master controller must be
• field-wired to all required control input signals,
• connected to all slave tanks via the DriSteem fieldbus,
• powered during system operation.
MULTI-TANK CONTROL INTERFACE
Most systems have one Vapor-logic touchscreen per multi-tank group. This touchscreen ships with the tank that has the
master control board. The touchscreen (or the Web interface; see note below) can be connected to any humidifier in the
multi-tank group. Maximum cable length from the touchscreen 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 78.
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
• Priority groups identify start-up order:
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.
• Trim tank responds first:
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.
OPERATION
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