14
HIGH VOLTAGE!
D
ISCONNECT
ALL
POWER
BEFORE
SERVICING
.
M
ULTIPLE
POWER
SOURCES
MAY
BE
PRESENT
. F
AILURE
TO
DO
SO
MAY
CAUSE
PROPERTY
DAMAGE
,
PERSONAL
INJURY
OR
DEATH
.
WARNING
3. Remove the remote control after servicing and test run.
Operating the remote control may disturb the normal
operation of the system.
4. Do not change T1/T2 during power up.
5. Turn power ON for the indoor and outdoor units.
Setting the Temperature Control System
Mode No. Code No.
Description of Setting
23(13)-0
03
0-10V control using W-control
Field Setting
IMPORTANT FIELD SETTING INFORMATION!
FAILURE TO CHANGE THE FIELD SETTING TO
23(13)-0-03 CAN RESULT IN PREMATURE EQUIPMENT
FAILURE.
Operation with 0 - 10V 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 generate
a 0–10 V signal that will be used by the EKEQF control box for the
capacity control of the system.
0-10V
1
2
3
1: Field supplied Control
2: Control box EKEQF
3: Level 1 - 5 for capacity control
Figure 21
The system needs a field-supplied controller with a temperature
sensor. The temperature sensor can be used to control the follow-
ing temperatures:
• Suction air temperature of the air handler unit
• Room air temperature
• Discharge air temperature of the air handler 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 following table.
Step
Voltage field
controller (*)
System
capacity (
†
)
T
e
during
cooling
operation
T
c
during
heating
operation
1
0.8 V
0% (OFF)
--
--
2
2.5 V
40%
56
˚F
(13.5°C)
88
˚F
(31°C)
3
5 V
60%
52
˚F
(11°C)
97
˚F
(36°C)
4
7.5 V
80%
47
˚F
(8.5°C)
106
˚F
(41°C)
5
9.2 V
100%
43
˚F
(6°C)
115
˚F
(46°C)
(*) 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.
IMPORTANT NOTE:
The system response to the 0-10 V output
from the field supplied control is the same in cooling and heating
operation. 10 V means 100% system capacity in cooling and
heating operation. The field supplied control will output a 0-10 V
signal based on T.
The table below shows as example. A∆T of 7.2°F / 4°C in cooling
operation means that the field supplied control need to output 10
V, so the cooling capacity will be 100%. A ∆T of 7.2°F / 4°C in
heating operation means that the field supplied control needs to
output 0 V, so the heating capacity will be 0% (OFF).
Target
temperature
Actual
measured
temperature
ΔT value
Required system
response
Cooling
operation
75˚F (24°C) 82˚F (28°C)
+7.2˚F / +4°C
High capacity
(10 V)
Heating
operation
75˚F (24°C) 82˚F (28°C)
+7.2˚F / +4°C
No capacity
(0 V)
The response of the field supply control must therefore be invert-
ed for cooling or heating operation.
Setting the indoor fan control
This setting applies to EKEQFCBAV3-US control boxes.
In fan only and cooling mode, the indoor fan is ON when the unit
is operating.
For heating operation, different settings can be made:
Mode No. Code No.
Description of setting
01
Fan ON at thermo OFF
02
Fan ON at thermo OFF
03(*)
Fan OFF at thermo OFF
22(12)-3
(*)
Factory setting
Mode No. Code No.
Description of setting
01(*)
Fan OFF at defrost and oil return
02
Fan ON at defrost and oil return
03
Fan ON at defrost and oil return
23(13)-8
(*)
Factory setting
IMPORTANT NOTE:
The combination of “Fan OFF during thermo OFF” and “Fan ON
during defrost/oil return” will result in fan ON during thermo OFF.
Operation Setting in Case of Power Failure
This setting applies to the EKEQFCBAV3-US control box.
Setting the Indoor Fan Control
