8 TEMPERATURE CONTROL FUNCTIONS
Once Ech 200 has been configured, loads may be controlled on the basis of temperature and pressure conditions detected
by probes and temperature control functions which may be defined using the appropriate parameters.
There are 4 possible operating modes:
• cooling
• heating
• stand-by
• off
Cooling: this is the “summer” operating mode; the machine is configured for cooling.
Heating: this is the “winter” operating mode; the machine is configured for heating
Stand-by: the machine does not govern any temperature control function; it continues to signal alarms
Off: the machine is turned off.
The operating mode is determined by settings entered on the keyboard and by the following
Parameters:
• Operating mode parameter (Pa H27)
• Heat pump parameter (Pa H28)
• Configuration parameter AI1 (Pa H05) ( refer to Analogue inputs: configuration table)
• Configuration parameter AI2 (Pa H06) (refer to Analogue inputs: configuration table)
Operating mode selection parameter (Pa H27)
• 0= Selection from keyboard
• 1= Selection from digital input (refer to digital inputs)
• 2= Selection from analogue input (probe AI4)
Heat pump parameter (Pa H10)
• 0 = Heat pump not present
• 1= Heat pump present
Heating mode is permitted only if:
• heat pump is present (Pa H28= 1) or
• relay NO4 is configured as boiler output (Pa H24= 2).
Combinations of these parameters will generate the following rules:
Operating mode Mode selection
parameter
Pa H27
Configuration
parameter AI1
Pa H05
Configuration
parameter AI2
Pa H06
Mode selection from keyboard 0 Other than 2 Other than 2
Mode selection from digital input. 1 Other than 2 Other than 2
If input AI1 is on, operating mode is heating; if
not, stand-by
Any 2 Other than 2
If input AI2 is on, operating mode is cooling; if
not, stand-by
Any Other than 2 2
If input AI1 is on, operating mode is heating; if
AI2 is on, operating mode is cooling; if AI1 and
AI2 are both on, there is a configuration error; if
neither is on, operating mode is stand-by
Any 2 2
8.1 Selection of operating mode from analogue input
The controller permits selection of operating mode on the basis of the temperature detected and supplied by input AI4
(refer to analogue inputs).
This is permitted if both of the following conditions apply:
• probe AI4 is configured as an outdoor temperature probe (Pa H08= 3)
• mode selection parameter Pa H27= 2
• In this case mode is selected automatically, on the basis of the following regulation algorithm parameters:
• Heating mode set point Pa H29
• Mode selection differential Pa H30.
An example of operation is shown in the diagram below:
Operating modes
Cooling
Heating
Stand-by
Device of
Operating modes:
configuration
table
Diagram
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