Economizer function

File: Economizer.doc

Last edition: 2003-03-04

Author: Mikael Krantz

History: 96-02-13/MK First released version.

96-10-03/MK Updated to Menta 1.20

97-08-28/MK Updated to Menta 3.0

98-12-29/MK New file name

2003-03-04/MK Updated to Menta 4.0

Description

Economizer function is activated during cooling mode if the "Exhaust air temperature" goes below the "Outdoor temperature" with more than "Economizer limit". The economizer function is deactivated then the "Outdoor temperature" goes below the "Return air temperature". Economizer function is blocked if the "Return air temperature" sensor is not connected. It is not possible to set a lower value on "Economizer limit" than 1 °C.

Inputs

(Real) Outdoor temperature, °C.

(Real) Exhaust air temperature, °C.

(Binary) Fan operation flag

(Binary) Heating case flag

Outputs

(Binary) Economizer flag

Parameters

(Real) EconomizerLimit 2 °C

Public signals

(Real) EconomizerLimit

(Binary) EconomizerFlag

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