DK-RC-MBS-1
User’s Manual r3.3
EN
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This information is subject to change without notice
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Phone
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10/23
o
After a couple of values have been
entered in the “AC unit external
temperature
’s
reference
” (register 22/23) and “AC unit temperature set
point” (register 4/5
),
DK-RC-MBS-1 is going to estimate the temperature chosen implied (e.g. if a
“temperature setpoint (register
4/
5)” of
22ºC
, and an
“external temperature
reference (register 22/
23)” of
20ºC
are entered, DK-RC-MBS-1 will assume that
the user is demanding a
+2ºC
increase in temperature).
o
By knowing at any time the ambient temperature currently used by the indoor
unit to control its own operation (register 5/6), DK-RC-MBS-1 can calculate the
required temperature setpoint needed to apply the decrease/increase on the real
temperature and reach the temperature chosen by the user (following the
example above, if DK-RC-MBS-
1 reads an “ambient temperature” (register
5/6)
of
24ºC
in the indoor unit, it will apply a final setpoint of
24ºC + 2ºC = 26ºC
).
o
At this moment, each time that DK-RC-MBS-1 detects a change on the ambient
temperature reported by the indoor unit (register 5/6), it will also change the
required setpoint, in order to keep the temperature required by the user at any
time. If we follow the last example, if DK-RC-MBS-1 receives a new
temperature´s value coming from the indoor unit of
25ºC
, DK-RC-MBS-1 will
automatically adjust the temperature setpoint required of the AC indoor unit to
25ºC + 2ºC = 27ºC
).
o
In general, DK-RC-MBS-1 is constantly applying the
“
Virtual Temperature
”
formula:
S
AC
=
S
u
– ( T
u
– T
AC
)
Where:
S
AC
- setpoint value currently applied to the indoor unit
S
u
- setpoint value written at Modbus side (register 4/5)
T
u
- external temperature reference written at Modbus side (register 22/23)
T
AC
- ambient temperature that the indoor unit is using as the reference of its
own control loop (register 5/6)
When DK-RC-MBS-1 detects a change in any of the values of
{
S
u
,
T
u
,
T
AC
}, it will send the new setpoint (
S
AC
) to the indoor unit.
o
After the startup, the
value for “external temperature’s
reference” (reg
ister
22/23) has a value -32768 (0x8000). This value means that no external
temperature reference is being provided through DK-RC-MBS-1. In this scenario,
the setpoint value shown in register 4/5 is always the same as the current
setpoint value of the indoor unit. The AC indoor unit will use its own return path
temperature sensor as reference for its control loop.
o
When the
mechanism of “
Virtual Temperature
” is applied
.
The temperature
setpoint’s value shown by the Remote Controller o
r other Control System from
Daikin connected to the indoor unit may show a different value from the value
shown in register 4/5.
o
If it is desired to use the temperature’s reading from the Remote Control as the
external temperature reference (
T
u
,register 22/33), the Remote Controller must
be configured as Master, and the Daikin AC indoor unit must have the option
“
thermostat sensor in the Remote Controller
”
as activated. This configuration is
done via a Daikin Remote Controller connected to the indoor unit and must be
done by Daikin authorized installers while the AC is being installed.
