Daikin ERQ Series Service Manual page 66

W-, X-, Y-, Z-Control
2.1.1 Different steps
The EKEQF control box will interpret the 0-10 V signal according to 5 steps. The correlation
between the voltage output and the system capacity is shown in the table below.
(*)
(†)
% capacity
2.1.2 System capacity
The system response to the 0-10 V output from the field-supplied controller is the same in
cooling and heating operation.
The field-supplied controller will output a 0-10 V signal based on T.
0 V is interpreted as no capacity.
10 V is interpreted as high capacity both in cooling AND heating operation.
Example:
A T of 4°C in cooling means that the field-supplied controller needs to output 10 V, so that the
cooling capacity will be 100%.
The same T of 4°C in heating operation means that the field-supplied controller needs to
output 0 V, so that the heating capacity will be 0%.
Cooling operation
Heating operation
The response of the field-supplied controller must therefore be inverted for cooling or heating
operation.
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Voltage field
Step
(*)
controller
1 0,8 V
2 2,5 V
3 5 V
4 7,5 V
5 9,2 V
Voltages shown are the center points of each step range.
The capacities mentioned in the table above are not exact. The compressor frequency can vary and will have
an impact on the system capacity.
Target
temperature
24°C
24°C
T during cooling
(†)
e
System capacity
0% (OFF)
40%
60%
80%
100%
Actual measured
temperture
28°C
28°C
ESiEN09-06 A
T during heating
c
operation operation
- -
13,5°C 31°C
11°C 36°C
8,5°C 41°C
6°C 46°C
Input VDC
(C6 - C5)
Required system
T
response
High capacity
+4°C
(10 V)
No capacity
+4°C
(0 V)
Control Box EKEQ - CBV3