Catalog

Standard controllers
Communicating HVAC controllers
Application examples RMH.. / RMK..
5-18
2015Some products are not available in every country
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Siemens Switzerland Ltd
Building Technologies Division
5
Boiler cascade‚ 2 boilers with 2-stage burnersRMK770..
K6.2
V Control of the boiler temperature via 2-stage burner
V Controlled boiler return temperature with 3-port valve and 3-position or DC
0…10 V actuator
V Control of the boiler pumps
V Common flow and return temperature control
V Extension module RMZ789 needed
Dual-boiler plant‚ boiler pumps‚ boiler return with 3-port
valve
RMK770..
HFF003 MK7 HQ
V Control of the boiler sequence
V Automatic changeover of lead boiler depending on the number of boiler oper-
ating hours
V Control of the boiler pumps
V Control of the boiler temperature via modulating burner with 3-position or DC
0…10 V control
V Burner fault contact
V Limitation of the burner’s minimum on time
V Controlled maintained boiler return temperature with 3-port valve and 3-posi-
tion or DC 0…10 V actuator
V Protective boiler startup
V Maximum and minimum limitation of the boiler tempe-rature
V Selection of boiler operating mode
V Flue gas measuring mode‚ boiler testing mode
V Burner hours run and burner startup counter
V Minimum and maximum limitation of the flow tempera-ture
V Automatic changeover to summer operation
V (heating OFF)
V Pump overrun‚ pump kick
V Valve overrun‚ valve kick
V Acquisition and evaluation of heat requisition signals via Konnex bus
The indicated energy efficiency classification can be attained only if the fol-
lowing functions are implemented:
In connection with an application that fulfils the energy efficiency class B‚ neces-
sary for:
V Emission control
V Control of distribution network hot watertemperature (supply or return)
V Control of distribution pumps
V Intermittent control of emission and/or distribution
To fulfill the classification‚ the plant must be equipped with
all indicated functions.