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Building Technologies Boiler Sequence Controller RMK770 CE1P3132en
HVAC Products 7 Boiler control 23.04.2009
If the control’s response is too ”hefty” so that it overshoots or starts oscillating, setting
parameters Xp, Tn and Tv must be increased in a stepwise fashion. A new readjust-
ment should be made only after the control action resulting from the previous readjust-
ment is completed.
t
TBo
TBoSetp
3132D11
1. Reduce Xp in steps of about 25% of the previous value.
2. Increase Tv in steps of 2 to 5 seconds.
If this is not sufficient:
3. Increase Tn in steps of 10 to 20 seconds.
7.8.5 External burner control
The RMK770 delivers a DC 0…10 V signal as a boiler temperature setpoint for an
external boiler temperature controller.
Main menu > Commissioning > Settings > … or
Main menu > Settings > Outputs > Setpoint comp boiler …
Operating line Range Factory setting
Setpoint at 0 Volt –150…50 °C 0 °C
Setpoint at 10 Volt 50…500 °C 100 °C
Limit value 0…140 °C 10 °C
Using setting parameters, the DC 0…10 V output can be matched to the receiver of the
heat demand signal. For setpoints below the limit value, the modulating output delivers
a signal of DC 0 V.
7.9 Protective boiler functions
Main menu > Commissioning > Settings > … or
Main menu > Settings > Boiler > Limitations
Operating line Range Factory setting
Boiler temperature max 25…140 °C 95 °C
Boiler temperature min 8…140 °C 10 °C
Optimization min boiler temp On / Off On
Boiler return temperature min ---- / 8…140 °C ---- °C
Bypass pump switching diff 1…20 K 6 K
Cons overrun time 0…60 min 6 min
Frost protection (release input off) On / Off On
Frost prot boiler pump On / Off On
Protective boiler startup On / Off On
Protective boiler startup Pump on / Pump off Pump on
Delta boiler temp max (stage 2) 0…10 K 1 K
Control action is
too fast
Setpoint compensation
Settings
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