andrews SH60, Руководство пользователя

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Controls
Basic controls and connections
Control by building managemant system
Boiler enable signal
Temperature or capacity setpoint
18
Basic controls and connections
The standard version of the R600 is
equipped with a KM628-R600 boiler
management unit. This controller
controls both the burner safety operati-
on and the temperature regulation of
the boiler. The KM628-R600 includes
the following functions:
When additional control of secundary
heating zones or cascade systems are
required, the R600 can be extended
with different additional controls. Expla-
nation of these controls can be found in
the next sections.
•
Electronic high limit thermostat
•
Electronic flue gas temperature limiter
•
Primary boiler pump control (via re-
lay)
•
Primary sanitary hot water pump
control (via relay)
•
Interlock input
•
Lockout input
•
OK/Alarm output signal
•
Boiler enable signal
•
0-10VDC temperature or capacity
setpoint (programmable)
•
0-10VDC capacity feedback or 10V
contact for external gas valve
(programmable)
•
Temperature control central heating
via PID controller
•
Temperature control sanitary hot wa-
ter (hot water priority)
Control by building managemant
system
The R600 can be connected to a buil-
ding management system. This can be
done by using (one of) the following
connections:
0
20
40
60
80
100
0 2 4 6 8 10
[V]
[ºC]
0
20
40
60
80
100
0 2 4 6 8 10
[V]
[%]
Boiler enable signal, terminals 22-23
(230V)
The boiler enable signal is provided
with a jumper from the factory. When
connecting a (volt free!!!) external sig-
nal, the jumper must be removed.
Temperature or capacity setpoint,
terminals 117-118 (0-10VDC)
The R600 can be controlled via a
temperature or capacity setpoint. The
following graphs show the signal va-
lues for both possibilities.
Temperature setpoint
A signal below 2V will not be recogni-
sed by the boiler controller. In case of
a signal below 2V, the controller will
control the boiler temperature based
on the internal setpoint programmed
at parameter P1.
Capacity setpoint
The burner will be started when a
signal of minimum 3V is recognised.
The burner will be switched off, when
the signal drops below 2.9V.
When controlling the boiler via a ca-
pacity setpoint, it’s highly recommen-
ded to control the primary boiler pump
with the internal pump control of the
KM628 boiler controller. The mini-
mum flow rate through the boiler must
be respected at all times. The nomi-
nal
∆ T is 20K and should be at least
within 15K-25K at full load to secure a
safe boiler operation.