Daikin ERQ Series Service Manual page 88

Operation with 0–10 V capacity control: X-control
For X-control, a field-supplied controller needs to be connected to the
EKEQF control box. The field-supplied controller will geneate a 0–
10 V signal that will be used by the EKEQF control box for the
capacity control of the system.
1 Field-supplied controller
2 Control box EKEQF
3 Level 1 ~ 5 for capacity control
The system needs a field-supplied controller with a tempeature
sensor. The temperature sensor can be used to control the following
temperatures:
Suction air temperature of the air handling unit
Room air temperature
Discharge air temperature of the air handling unit
Program the field-supplied controller so that it outputs a 0–10 V
signal based on the temperature difference between the actual
measured temperature and the target temperature.
V Controller voltage output to EKEQF
T [actual measured temperature] – [target temperature]
When T=0, the target temperature is reached.
T Maximum temperature variation as defined by installation
max
Recommended value for T
The voltage output of the field-supplied controller is a linear function
with T:
It is possible that the T value can become higher than the chosen
T value. The output of the field-supplied controller needs to be
max
10 V or 0 V depending on the T value (see graph for detail).
Below an example for cooling and heating operation is given.
Cooling operation
T is selected at 3°C.
max
The target room temperature is 24°C
Actual
measured output field
temperature T value
20°C -4°C
21°C -3°C
22.5°C -1.5°C
24°C 0°C
25.5°C 1.5°C
27°C 3°C
28°C 4°C
EKEQFCBAV3 + EKEQDCBV3
Option kit for combination of Daikin condensing units
with field supplied air handling units
4P383212-1 - 2014.08
V
C
=[2°C~5°C].
max
Voltage
controller Cooling capacity
Cooling capacity will
0 V
strongly decrease
Cooling capacity will
0 V
strongly decrease
Cooling capacity will
2.5 V
decrease
Unit will keep operating at
5 V
same capacity level
Cooling capacity will
7.5 V
increase
Cooling capacity will
10 V
strongly increase
Cooling capacity will
10 V
strongly increase
Heating operation
T is selected at 3°C.
max
The target room temperature is 24°C
Actual
measured output field
temperature T value
20°C -4°C
21°C -3°C
22.5°C -1.5°C
24°C 0°C
25.5°C 1.5°C
27°C 3°C
28°C 4°C
Operation with fixed T /T temperature control
e c
The evaporating temperature (
which the application has to operate can be set by code numbers as
listed below.
Mode No. Code No.
01
02
03
04
23(13)–1
05
06
07
08
01
02
03
23(13)–2 04
05
06
07
(*) Depending on the operating temperature condition or on selection of the air
handling unit, operation or safety activation of the outdoor unit may take priority
and actual T /T will be different from the set T
e c
Operation with 0–10 V capacity control: W-control
For W-control, a field-supplied controller needs to be connected to
the EKEQF control box. The field-supplied controller will geneate a
0–10 V signal that will be used by the EKEQF control box for the
capacity control of the system.
1 Field-supplied controller
2 Control box EKEQF
3 Level 1 ~ 5 for capacity control
The system needs a field-supplied controller with a tempeature
sensor. The temperature sensor can be used to control the following
temperatures:
Suction air temperature of the air handling unit
Room air temperature
Voltage
controller Heating capacity
Heating capacity will
0 V
strongly increase
Heating capacity will
0 V
strongly increase
Heating capacity will
2.5 V
increase
Unit will keep operating at
5 V
same capacity level
Heating capacity will
7.5 V
decrease
Heating capacity will
10 V
strongly decrease
Heating capacity will
10 V
strongly decrease
)/condensing temperature (
T T
e
(*)
Description of setting
T = 3°C
e
T = 4°C
e
T = 5°C
e
T = 6°C (factory setting)
e
T = 7°C
e
T = 8°C
e
T = 9°C
e
T = 10°C
e
T = 43°C
c
T = 44°C
c
T = 45°C
c
T = 46°C (factory setting)
c
T = 47°C
c
T = 48°C
c
T = 49°C
c
/T .
e c
Installation and operation manual
) at
c
79