37
Installation
Electrical connection
External controls 0-10 Volt
3. 0-10 Volt-control
At a heat demand of the 0-10 Volt
controller a signal is sent out and
varies from 0-10 Volt. This signal is
translated by the Rendamax R40
ECO to a set value (desired flow water
temperature or load) which is send via
the Rendamax data bus to the boiler(s).
Depending on the Voltage the set value
becomes higher or lower.
The 0-10 Volt-controller must be
connected to terminal 3, position 9 and
10.
The choice for temperature or load
control can be done by a parameter
setting:
- Go to Setting level and Param.
Chapter,
- Go to Cascade Param.
- Select P101.
1: When P101 is adjusted to 1 the
load control is set. On that moment
P205 until P210 in chapter Cascade
Param. is released and can be
adjusted according to specific
requests.
2: When P101 is adjusted to 2 the
temperature control is set. On that
moment P215 until P220 in chapter
Cascade Param. is released and
can be adjusted according to
specific requests.
See page 50 for the adjustment
possibilities.
ADVICE: Choose temperature
control for a more balanced boiler
control
Behaviour of connected external
controls
- When using an OpenTherm or
0-10Volt control and a clock
program is selected, the clock
program of the R40 ECO will be
ignored.
- When an on/off control is connected
and the thermostat is switched on
manually before the pre-set switch-
on time, the clock program will be
ignored and will run on the set day
temperature. When switching off
manually the clock program will be
followed.
0-10Volt
Open-
Therm
On/Off
T3
DHW
1 2 3 4 5 6 7 8 9 10 11 12 13 14
T10
General
purpose
LWCO
T4
Out