DriSteem Vapor-Logic Guide de dépannage télécharger pdf (Page 82)

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Operation

Tank grouping to maximize efficiency

Priority 1 and priority 2 tanks can be grouped to improve efficiency.

Tanks not identified as trim or redundant tanks are factory-assigned to

priority groups 1 and 2. Priority 1 tanks come online before priority 2

tanks. Because tanks in a multi-tank system can vary by capacity, this

allows tank grouping to maximize efficiency, bringing tanks online

in the order that best matches humidification load to individual tank

capacity.

Example 1:

A large-capacity tank that meets humidification demand most days is

assigned to priority group 1.

Smaller-capacity tanks, needed only when additional capacity is

needed, are assigned to priority group 2.

Example 2:

A gas-fired tank that meets humidification demand most days is

assigned to priority group 1.

Electric tanks, needed only when additional capacity is needed, are

assigned to priority group 2

Note: Wear leveling occurs only within a priority group.

Redundant tank for mission-critical applications

A redundant tank can be assigned for mission-critical applications. The

system capacity of a multi-tank group is the combined capacity of tanks

in groups 0, 1, and 2. Placing a tank in priority group 3 ensures that it

only runs as a redundant tank. The redundant tank can be assigned

to priority group 3 and will operate only if one or more of the tanks

in groups 0, 1, and 2 are not available, and the remaining tanks in the

multi-tank group cannot meet demand for steam production.

Note: For best performance, multiple electric humidifiers in a given

priority group must all have the same heater controls. That is,

they should all be 100% SSR control, or all be sequenced SSR

control, or all be contactor control.

Tank wear leveling

The master controller monitors tank wear and assigns steam production

to tanks to equalize wear as much as possible within each priority

group.

Fault tolerance

The master controller monitors tank status of all tanks in a multi-tank

group periodically. If a tank goes offline or is not communicating (“No

comm”) for a defined time period, the controller identifies that tank as

unavailable and the system responds using other available tanks. If the

master controller stops operating, the remaining slave tanks continue to

run for a short time at the level they were last run, and then quit.

Configuration tips

t Use priority groups 1 and 2 to group tanks

for maximum energy efficiency. For example,

put gas-fired tanks in group 1 and electric

tanks in group 2.

t Multiple small-capacity tanks usually operate

more efficiently than one large-capacity tank

meeting the same load requirement.

t Use priority groups 1 and 2 to group tanks

by capacity, bringing tanks online in the

order that best matches humidification load

to individual tank capacities.

t If your multi-tank system has a redundant

tank, configure that tank as the master

controller. This will reduce system down time

while the master controller tank receives

servicing. Since the redundant tank operates

the least in a multi-tank system, it is the

tank most likely to remain online.

t Match the capacity of the redundant tank

to the largest tank in the system to ensure

the system’s ability to meet maximum

humidification load when a tank goes

offline.

See Note 1 in Table 79-1.

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DriSteem Vapor-Logic Guide de dépannage Page 82

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