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Building Technologies Boiler sequence controller RMK770 CE1P3132en
HVAC Products 7 Boiler control 23.04.2009
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Limitations
Operating line Range Factory setting
Bypass pump switching diff 1…20 K 6 K
The bypass pump controls the return temperature in 2-position mode within the adjust-
able switching differential.
The pump is activated when there is demand for heat and when the return temperature
drops below its minimum limit value.
The pump is deactivated when the return temperature exceeds its minimum limit value
by the switching differential or when there is no demand for heat.
Br
ByP
TiOverrunCnsm
TBoR
t [min]
10 20 30
60
50
40
30
TBoRmin+SDByP
TBo
TBoRmin
0
1
t
0
1
t
3131D05
Br Burner
ByP Bypass pump
SDByP Switching differential of bypass pump
t Time
Tbo Boiler temperature
TboR Boiler return temperature
TboRmin Minimum limit value of the boiler return temperature
TiOverrunCnsm Consumer overrun time
When the burner shuts down, pump overrun (refer to section 5.4 “Pump overrun and
mixing valve overrun“) also acts on the bypass pump.
If no return sensor is installed, the bypass pump operates at the same time as the
burner. The bypass pump always runs when released and when the burner’s basic
stage operates.
If minimum limitation of the return temperature shall be provided with a mixing valve per
boiler, the mixing valve must be configured. With plant types K6.x, that mixing valve
with a 3-position actuator is preconfigured; with the other types of plant, the mixing
valve and the return temperature sensor can be added in the extra configuration.
Main menu > Commissioning > Extra configuration > Boiler … > Outputs
Operating line Adjustable values / remarks
Maint boiler return temp 3-pos Assign output
Maint boiler return temp mod Assign output
Main menu > Commissioning > Extra configuration > Boiler … > Inputs
Operating line Adjustable values / remarks
Return temperature sensor Assign input
Bypass pump control
parallel to burner
operation
Maintained boiler return
temperature controlled
by mixing valve
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