Daikin ERQ Series, Service Manual

Page: 89 / 153

Installation and operation manual
80
EKEQ EKEQDCBV3
Option kit for combination of Daikin condensing units
with field supplied air handling units
4P383212-1 - 2014.08
Discharge air temperature of the air handling unit
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.
The response of the field-supplied controller usttherefore be
inverted for cooling or heating operation.
Setting the indoor fan control
In fan only and cooling mode, the indoor fan is ON when the unit is
operating.
For heating operation, different settings can be made:
Operation setting in case of power failure
O
PERATION AND DISPLAY SIGNALS
Step
Voltage field
controller
(*)
(*) Voltages shown are the center points of each step range.
System
capacity
(†)
(†) The capacities mentioned in the table above are not exact. The compressor
frequency can vary and will have an impact on the system capacity.
T
e
during
cooling
operation
T
c
during
heating
operation
1 0.8 V 0% (OFF) — —
2 2.5 V 40% 13.5°C 31°C
3 5 V 60% 11°C 36°C
4 7.5 V 80% 8.5°C 41°C
5 9.2 V 100% 6°C 46°C
The system response to the 0–10 V output from the field-
supplied controller is the same in cooling and heating
operation. 10 V means 100% system capacity in cooling
and heating operation. The field-supplied controller wil
output a 0–10 V signal based on T (see "Operation with
0–10 V capacity control: X-control" on page 79 for the
definition of T).
In the table below an example is given. A T of 4°C in
cooling operation means that the field-supplied controller
needs to output 10 V, so that the cooling capacity will be
100%. A 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% (OFF).
Target
temp.
Actual
measured
temp. T
Required
system
response
Cooling
operation
24°C 28°C +4°C
High capacity
(10 V)
Heating
operation
24°C 28°C +4°C
No capacity
(0 V)
NOTE
This setting applies to both EKEQDCB and
EKEQFCBA control boxes.
Mode No. Code No. Description of setting
22(12)–3
01 Fan ON at thermo OFF
02 Fan ON at thermo OFF
03
(*)
(*) Factory setting
Fan OFF at thermo OFF
Mode No. Code No. Description of setting
23(13)–8
01
(*)
(*) Factory setting
Fan OFF at defrost and oil return
02 Fan ON at defrost and oil return
03 Fan ON at defrost and oil return
NOTE
The combination of "Fan OFF during thermo OFF" and
"Fan ON during defrost/oil return" will result in fan ON
during thermo OFF.
NOTE
This setting applies to both EKEQDCB and
EKEQFCBA control boxes.
Measures must be taken to ensure that after power failure,
T1/T2 is according to the setting of your preference.
Neglecting this caution will result in improper operation.
Mode No. Code No. Description of setting
22(12)–5
01
T1/T2 must be open at power
restore.
(*)
(*) After power failure, T1/T2 must be changed to open (no cooling/heating
requested).
02
(†)
(†) Field setting
After power failure, the status of
T1/T2 must remain identical to the
initial T1/T2 status prior to the power
failure.
For EKEQFA only
Output
C1/C2 error
signal
Error: open
Abnormal operation on
condenser or control system
Power failure
No error: Open
Normal operation
T1/T2 is open: no error
detection anymore
C3/C4
operation
signal
Closed Compressor not operating
Open Compressor operating
C7/C8 fan
output
Open Fan off
Closed Fan on
C9/C10 defrost
output
Open No defrost operation
Closed Defrost operation
Input
C5/C6:
capacity step
0–10 V
Only necessary for field
setting 23(13)–0 = 01 or 03
0–10 V capacity control
(*)
(*) Refer to paragraph "Operation with 0–10 V capacity control: X-control" on
page 79 and "Operation with 0–10 V capacity control: W-control" on page 79.
T1/T2
(†)
(†) See field setting 22(12)–5.
Open
No cooling/heating
requested
Closed Cooling/heating requested
For EKEQD only
Output
C1/C2 fan
output
Open Fan off
Closed Fan on
Input
T1/T2
(*)
(*) See field setting 22(12)–5.
Open
No cooling/heating
requested
Closed Cooling/heating requested
The fan of the air handling unit must operate before
cooling operation is required to the outdoor unit.
When the operation signal is activated, the air
handling unit and fan must operate. Failure to this will
cause a safety to operate or freezing up of the air
handling unit.