Controls
OK/Alarm output signal
Heating zone control
Cascade control
20
Heating zone control
The R40 can be extended with an
AVS75 controller for extended heating
zone control. The AVS75 enables
weather compensated operation of one
mixed heating zone.
For room temperature optimisation of
each heating zone, an additional roo
m
unit QAA75 can be connected via bus
connection. The values for the specific
heating zone can then be displayed
and changed on the room unit.
In case of heating systems with more
than two heating zones, an additonal kit
with Logon B G2Z2 controller in a wall
hung box is available. These kits can
be used in a modular way up to a
maxi
mum of 8 heating zones.
See chapter "Installation examples" for
more details regarding connections of
pumps, sensors, etc.
Cascade control
The R40 can be controlled in a cascade
system of maximum 8 boilers. This can
be done by using the integrated Master/
Slave cascade functionality in combina-
tion with an optional BUS communicati-
on device OCI345 (see chapter
"Accessories" for more details).
The LMS14 includes an intelligent
cas
cade control, which allows free
pro
gramming of boiler sequence after
cer
tain hours of operation.
See chapter "Installation examples" for
more details regarding connections of
pumps, sensors, etc.
OK/Alarm output signal, terminals
QX2-4, QX2-3 and QX2-4 (230VAC) or
extension module AVS75 (contact
QX21) when combined with external
gas valve and/or room fan or gas
leakage tester.
The boiler provides, depending on it
s
status and the setting of the relay
(factory setting = alarm) an OK or alarm
signal at terminal 4 (or QX21).
