DriSteem Vapor-Logic Anleitung zur Fehlerbehebung PDF herunterladen (Seite 64)

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Aquastat set point feature

Note: This feature is not applicable for XT humidifiers.

The aquastat set point is the minimum tank temperature the

Vapor-logic4 controller maintains when there is no call for

humidity or when safety circuits are not satisfied (e.g., high limit or

airflow proving switch). The aquastat set point is adjusted through

the water management section of the Setup menu. This feature

shortens the tank preheat time, providing a rapid response to a call

for humidity.

For example, if the aquastat is set at 180 °F (82 °C) when a call for

humidity occurs, the tank only needs to warm up 32 °F (18 °C) to

reach the boiling point. However, if the aquastat is at its minimum

default setting of 40 °F (4 °C) and the tank is in an average-

temperature occupied room, when a call for humidity occurs, the

tank needs to warm up from room temperature to the boiling point

before producing steam. When an aquastat call is heating the tank,

the word “Heating” appears on the Home screen. Aquastat heating

will occur with high-limit and airflow alarm conditions.

Freeze protection

Freeze protection is similar to aquastat operation with some

exceptions. The freeze protect set point is fixed at 40 °F (4 °C). Its

purpose is to prevent the tank from freezing in cold environments.

Unlike aquastat, if a condition exists that prevents the heaters,

burners, and valves from firing (such as an alarm, an external

interlock switch is open, or the humidifier is in Standby mode),

instead of remaining idle, the controller switches to manual drain

run mode and the tank drains to prevent freezing. Change mode to

Auto to resume operation.

When the tank is heating to prevent freezing, the word “Heating”

appears on the Home screen. When the tank is draining or has

drained to prevent freezing, the “Freeze drain” message appears

in the Messages Log and the Message softkey label becomes

highlighted.

Fan-based dispersion operation

If your humidifier is equipped with a Space Distribution Unit

(SDU) or an Area-type fan, it is enabled after the Vapor-logic4

controller receives a call for humidity and the tank water is

approaching boiling temperature.

When the humidifier no longer receives a call for humidity, it stops

heating and the SDU or Area-type fan continues to run for the

time delay period (as defined in the fan-based dispersion section

Setup menu).

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Operation

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