Daikin UATYA-B, Руководство по эксплуатации

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Service manual Daikin R32 Rooftops UATYA-B
ESIE21-02 – 2021.03
3.14 Limitation of damper operation
The damper opening setpoint may be limited by operation of the refrigerant circuit or by conditions relating to air comfort in
the room.
If damper opening is greater than normally required for air change (e.g. during a washing cycle with thermoregulation
enabled or upon request of the air quality probes), conditions may be experienced that are critical for refrigerant circuit
operation.
3.14.1 Limitation based on condensing pressure in heating mode
When a refrigerant circuit in the unit is operating in cooling mode, the condensing pressure may limit the damper control
signal.
The parameters concerned are shown in the table.
The values of the parameters are representative. In specific cases, different values can be set.
Parameter Value UM Description
DA12 30 % External air - FC / FH - Min opening
DA13 100 % External air - FC / FH - Max opening
DA28 35.80 bar
External air - Opening limitation - Summer oper. - Max cond. press. threshold for
activation
DA29 2.00 bar External air - Opening limitation - Summer oper. - Max cond. press. diff. for activation
DA36 0 % External air - Opening limitation - Min opening for cond. press.
DA37 60 % External air - Opening limitation - Max opening for cond. press.
DA40 2.00 bar External air - Opening limitation - Deactivation diff. for cond. press.
A graphical representation is shown below.
DA28
DA37
DA13
DA12
%
Pcond (bar)
DA36
DA29 DA40
Fig. 31 Damper command in free cooling mode
In addition to the parameters listed in the table, the abbreviations in the graph are:
- Pcond = condensing pressure;
- As% = opening signal percentage for external/exhaust air.
3 Software functions