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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 3 Commissioning 23.04.2009
Controller Extension modules
Plant type
RMK770
RMZ789 RMZ787 RMZ789(2)
With main pump, no shutoff valve, no boiler pump
K1.1
1-stage burner
9
K1.2
2-stage burner
9
K1.3
Modulating burner, 3-position
9 9
With main pump, with shutoff valve, no boiler pump
K2.1
1-stage burner
9
K2.2
2-stage burner
9
K2.3
Modulating burner, 3-position
9 9
With main pump, with shutoff valve, with boiler pump in the bypass
K3.1
1-stage burner
9
K3.2
2-stage burner
9
9
K3.3
Modulating burner, 3-position
9 9
No main pump, no shutoff valve, with boiler pump
K4.1
1-stage burner
9
K4.2
2-stage burner
9
K4.3
Modulating burner, 3-position
9 9
No main pump, with shutoff valve, with boiler pump
K5.1
1-stage burner
9
K5.2
2-stage burner
9
9
K5.3
Modulating burner, 3-position
9 9
No main pump, maintained boiler return temperature with mixing valve, boiler pump
K6.1
1-stage burner
9 9
K6.2
2-stage burner
9 9
K6.3
Modulating burner, 3-position
9 9
9
With the plant types, the main flow and main return temperature sensors as well as the
boiler temperature sensor are always preconfigured. With plant type K6.x, the boiler
return temperature sensors are also preconfigured.
A main flow temperature is mandatory with all types of application. If there is no main
flow sensor, the measured value can be adopted inside the controller from the boiler
sensor of the current lead boiler.
The other sensors can be removed from the extra configuration, except in the case of
modulating burners where a boiler temperature sensor is always required.
The shutoff valves are always preconfigured to outputs with changeover contacts so
that on/off signals are available.
The on/off signals for modulating burners or for the mixing valve of the boiler return
temperature are preconfigured to outputs that can be used with RC units to ensure
suppression of radio interference.
The table below gives a summary of the plant types including the preconfiguration. The
following designations are used for the inputs and outputs.
Plant types and
module assignment
Assignment of sensors
Assignment of outputs
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