First start-up
Installation, use and maintenance manual – Next-G
49
5
Parameter Description of parameter
Setting
Measure-
ment unit Default
82
RS485 Modbus communication parameters
0. 9600 8 N 1
1. 9600 8 N 2
2. 9600 8 E 1
3. 19200 8 N 1
4. 19200 8 N 2
5. 19200 8 E 1
6. 38400 8 N 1
7. 38400 8 N 2
8. 38400 8 E 1
-
3
83
RS232 Modbus communication parameters
5.4.1
Settings according to the control system
With the OCDS015 Modbus remote control or a generic
Modbus controller, set the parameters as follows:
▶
Parameter 40 to a unique value for each gas unit heat-
er
▶
Parameter 42 to value 1 for all gas unit heaters con-
nected via Modbus
Without OCDS015 Modbus remote control or a generic
Modbus controller, leave parameter 42 at value 0 (default).
5.4.2
Settings depending on the installed
temperature probes
The room temperature probe is supplied and therefore
parameter 45 must be left at value 1 (default). Only if you
wish to activate the operation on two power levels, man-
aged by one of the controllers that support this function
(OTRG005, OCDS008, OSWR000), it is necessary to set pa-
rameter 45 to value 0.
If the destratification temperature probe is present, set
parameter 46 to value 1.
If the outdoor temperature probe is present, set parame-
ter 47 to value 1.
5.4.3
Settings of the automatic destratification
function
To activate the automatic destratification function, it is
necessary:
▶
Whether the supplied room temperature probe is in-
stalled (P45 = 1) or the control system provides the
room temperature value via Modbus.
▶
That the optional destratification probe is installed
(P46 = 1).
▶
Set parameter 80 (destratification differential thresh-
old).
▶
Set parameter 81 (maximum destratification time).
The destratification function starts in the presence of a
heating request (room temperature below setpoint) if
both of the following conditions are met:
▶
the temperature measured by the destratification
probe is higher than the setpoint
▶
the temperature differential is greater than the value
(P80 - 2)
At the start of the function, the fan runs at the first speed
and switches to the second speed (only for EC heaters)
if the difference between the temperature measured by
the destratification probe and the room temperature is
greater than P80.
If the maximum destratification time (P81) is exceeded or
if the difference between the temperature measured by
the destratification probe and the room temperature is
lower than the value (P80 - 2) the gas unit heater automat-
ically switches to heating mode, turning on the burner.
5.4.4
Settings according to the ventilation mode
For the summer ventilation mode, set parameter 54 to the
(fixed) speed value to be used for the summer ventilation
function.
For heating mode, set parameter 55 to value 1 if you wish
to have a fixed maximum ventilation speed (minimum
thermal leap) under all operating conditions. Otherwise,
leave it at value 0 (default) where the ventilation speed is
linked to the power level.
5.4.5
Settings according to the heating mode
Leave parameter 56 at value 1 (default) if you want the gas
unit heater power to modulate continuously.
Set parameter 56 to value 0 if you want the gas unit heater
to operate on three different power levels.
5.4.6
Settings according to the service request
5.4.6.1
With the remote control or a Modbus controller
With the remote control or a generic Modbus controller,
set the parameters as specified in Paragraph 5.4.1
For the OCDS015 Modbus remote control, please
refer to the instructions in the relevant manual.
For a generic Modbus controller, the parameters to be
set are a function of which Modbus registers are actually
managed by the controller and which must be configured
directly on the appliance board.
The document describing the mapping and
meaning of the Modbus registers implemented
on the GEN10 board is available on-demand from
Robur technical service.
5.4.6.2
Without remote control or Modbus controller
Without the OCDS015 Modbus remote control or a gener-
ic Modbus controller, the following Table 5.10
p. 50 lists
the parameters to be configured according to the func-
tionality to be obtained.
