Serial Communication - Daikin FWEC3 Manual De Instalación Y De Uso

CONFIGURATION OF 0-10V ANALOG OUTPUTS
(PARAMETER P14)
The table below is a guide to setting parameter P14 correctly
based on the type of valve(s) and fan the unit is equipped
with. For each type of unit an indication is given of which value
should be assigned to parameter P14 and the consequent use
mode of the two analogue outputs.
TYPE OF UNIT P14
2 OR 4 PIPES UNIT WITH
ON/OFF VALVE AND NON- 0
MODULATING FAN
2 PIPES UNIT WITH
MODULATING VALVE AND 1
NON-MODULATING FAN
2 PIPES UNIT WITH
MODULATING VALVE AND 2
MODULATING FAN
4 PIPES UNIT WITH
MODULATING VALVES
3
(MODULATING FAN NOT
ALLOWED)
2 OR 4 PIPES UNIT WITH
ON/OFF VALVE(S) AND 4
MODULATING FAN

SERIAL COMMUNICATION

Connection to the RS485 communication network
The communication network (bus type) relies on a simple
shielded 2-conductor cable, directly connected to the RS485
serial ports of the controllers (terminals A, B and GND).
For the network use a cable AWG 24 (diam. 0.511 mm).
The communication network must have the following general
structure (figure 4):
In the case of the "MASTER-SLAVE" solution a termination
resistor will have to be installed on both controllers at the
furthest ends of the network.
N.B.: (1) Comply with the polarity of the connection:
indicated with A(-) and B(+)
(2) Avoid ground loops (ground shield at one end
only)
LOGICS
COOLING/HEATING SWITCHING
Four logics are present to select the thermostat operating modes
according to the controller configuration setting parameter P00):
1 L ocal: user choice made through the key
2 D istance: depending on the Digital Input DI1 status (contact
logic: see configuration parameters of board): see circuit
board configuration parameters).
3 D epending on water temperature
summer
N.B.: in case of water sensor alarm, the controller returns to
the Local mode temporarily.
FWEC3
Advanced plus electronic controller
FC66002765
AOUT1 AOUT2
NOT USED NOT USED
VALVE
--
MODULATION
VALVE FAN
MODULATION MODULATION
COLD WATER HOT WATER
VALVE VALVE
MODULATION MODULATION
FAN
--
MODULATION
winter Water temperature
4 D epending on air temperature
Where:
 S et is the temperature setting made by the arrows
 Z N is the neutral zone (parameter P03)
winter
The thermostat operating mode is indicated on the display by
the symbols (cooling) and
VENTILATION
GENERAL ASPECTS
The controller can perform two types of fan control:
- step control, with a fixed number of selectable speeds
(3 or 4);
- modulating control, with speeds ranging from 0% to 100%
Which type of control will be used clearly depends on the type
of fan (modulating or non modulating) installed in the unit;
the controller makes the selection based on the value set for
configuration parameter P14. Step control in turn follows two
different logics depending on the type of valve(s) (ON/OFF or
modulating); this information, like the fan type, is deduced by
the controller based on the value taken on by configuration
parameter P14. Consequently, configuration parameter P14
must be carefully set in order to ensure that the unit functions
correctly.
N.B.: in the case of modulating fan control, in order
to achieve a correct adjustment the controller
takes into account the number of speeds implicitly
indicated by the value assigned to configuration
parameter P00. Though it may seem contradictory
to talk about "number of speeds" in the case of
modulating fan control, this information is essential
for indicating to the control system whether the
unit is designed to work in the natural convection
mode. Based on this information, the modulating
fan control will follow different logics.
Summing up, the automatic control logics implemented by the
controller (and described in detail below) are the following:
- step fan control with ON/OFF valve (or valve absent) and
3 speeds, in the cooling and heating modes (specular
logics);
- step fan control with ON/OFF valve (or valve absent) and
4 speeds, in the cooling and heating modes (specular
logics);
- step fan control with modulating valve and 3 speeds, in the
summer and winter modes (specular logics);
- step fan control with modulating valve and 4 speeds, in the
summer and winter modes (non-specular logics);
- modulating fan control with ON/OFF valve, in the summer
and winter modes (specular logics);
- modulating fan control with modulating valve
summer
Air temperature
(heating).
Installation and user manual
7