Maintained Boiler Return Temperature - Siemens RMH760 Manual

Boiler temperature control
Maintained boiler return
temperature
DHW heating
6/16
Siemens Building Technologies
HVAC Products
Boiler temperature control requires the RMZ781 boiler module. There are three
choices:
Pump in the flow:
G1
B2
M2
B7
In plants with maintained boiler return temperature with own mixing valve, the following
types of modules are required, in addition to the controller:
• Heating circuit module RMZ782; it controls the boiler return temperature via a mixing
valve, depending on the temperature acquired with B1. The module also controls
boiler pump M1
• Boiler module RMZ781; this module controls the boiler temperature depending on
the temperature acquired with B2, and also controls system pump M2
One of the basic types 4–... must be selected on the controller.
G3
RMZ781
B2
M2
B1
Y2
M1
RMZ782
Y1
DHW heating requires the RMZ783 DHW module. There are 5 choices:
DHW1
B4
E7
B41
M3
DHW3
B3
E7
M3
Y5
Data sheet RMH760
Boiler pump in the bypass:
G2
B2
M2 B7
B1 Boiler return temperature sensor (controlled variable)
B2 Boiler temperature sensor
M1 Boiler pump (can be a twin pump)
M2 System pump (can be a twin pump)
Y1 Mixing valve
Y2 Balancing valve
DHW2
M4
M3
Y5
DHW4
B4
M4
M5
B41
Y4
B2 Boiler temperature sensor
B7 Return temperature sensor
(optional, for minimum limitation)
M1 Boiler pump or system pump
(can be a twin pump)
M2 Bypass pump (can be a twin
pump)
B3
B4
E7
B41
B3
B31
E7
M3
M4
B4
M4
B41
CE1N3131en
03.07.2003