© KWB – Kraft und Wärme aus Biomasse GmbH
IM Easyfire 10/2008
Page
171
18.2 Hydraulic diagrams
18.2 Hydraulic diagrams
Basic module with weather-sensitive control system
& second boiler switchover
MBEH0005_a sheet 2/2
System description:
The hydraulic system, consists of boiler circuit and distributor and is de-coupled by a switch. The return flow boost
is executed via a thermal valve on at least 50 °C. The basic module for boiler / DHWC & buffer control is equipped
with a weather-sensitive control system for 2 heating circuits (option). One heating circuit is equipped with an
analogue room control unit (option), the second heating circuit is equipped with a digital room control unit (option)
for remote control. Automatic second boiler switchover is activated via plug-in module 1 (option) After heating
up the second boiler, the automatic boiler is switched off via the flue gas thermostat (22) that is only required
for a shared chimney, or via the second boiler sensor (3) at the switchover temperature (65 °C, adjustable). The
second boiler pump is switched on. When exceeding the overheating temperature (80 °C adjustable), the connected
heating circuits run at maximum temperature and the boiler is charged until it reaches the target temperature. If the
second boiler cools off to a temperature below the switchover temperature the automatic boiler goes into operation
again. The second boiler pump switches off.
Menu basic settings
Parameters
Settings
Return flow boost
Thermal valve
Second boiler
Switchover at
65 °C
Overheating
at
80
°C
Operation boiler pump
Off
Network settings
Boiler
External 2
Heat to target 2
Power output
Heating mode
Boiler
dependence
No
Heating
circuit/
heating circuit 0
Room sensor
Boiler/0
Outdoor
sensor
Boiler
Function
No
Group
no.
0
Heating
circuit/
heating circuit 1
Room sensor
Boiler/1
Outdoor
sensor
Boiler
Function
Yes
Group
no.
0
Heating
circuit/
heating circuit 2
Room sensor
DRCU 1
Outdoor
sensor
Boiler
Function
Yes
Group
no.
0
DHWC/DHWC 0
Function
Yes or before
Group
no.
0
Buffer/Buffer0
Function
No
Digital remote control/
Outdoor sensor
Boiler
Digital remote control1
Heating circuit
1 – 2
DHWC
0 – 0
Buffer
- - -
Hardware
Heating circuit modules
0
Digital remote control
1
Plug-in
modules
SB
Comment: If the second boiler hydraulics are looped through the automatic boiler, then “Boiler pump mode” must
be set to “On” so that the boiler circuit pump (4) runs together with the second boiler pump.
Subject to change!
Techn. data sheet:HYD-USP-MBEH0005_a, sheet 2/2, date: 13-07-06 StHo
MA-Easyfire 10.2008_EN.indd 171
MA-Easyfire 10.2008_EN.indd 171
30.03.2009 13:32:13 Uhr
30.03.2009 13:32:13 Uhr