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Building Technologies Division User Manual LMS14... CC1U7471en
6 The settings in detail 07.05.2014
6.11.5 Frost protection for the boiler
Line no. Operating line
2217 Setpoint frost protection
The setpoint for the boiler’s frost protection can be set by the OEM.
Frost protection for the boiler is ensured, independent of heat requests or connected
plant components. Therefore, boiler control checks frost protection autonomously and
also causes the burner to be started up, if necessary.
Frost protection for the boiler is activated whenever the boiler temperature drops below
the Frost Protection setpoint.
The switch-off threshold is determined
as follows:
Switch-off threshold boiler =
Frost protection setpoint + Switching diff
on HCs (2454) + Switching diff off min
HCs (2455)
The boiler temperature setpoint is
determined as follows:
Boiler temperature setpoint = frost
protection threshold + Switching diff on
HCs (2454) + Switching diff off min HCs
(2455)
If Ctrl boiler pump/DHW valve (5774) is set to All requests, the boiler pump runs during
the time frost protection for the boiler is active.
If set to Request HC1/DHW only, the boiler pump will not be activated.
If the boiler pump ran during the time frost protection for the boiler was active, pump
overrun is performed when frost protection for the boiler has ended.
If Setpoint frost protection (2217) is set to OSV (- - -), frost protection for the boiler is
not deactivated, but the frost protection setpoint is set to -20 °C.
Additional parameters
Line no. Meaning
2454 SdHkEin Switch-on differential heating circuits
2455 SdHkAusMin Minimum switch-off differential heating circuits
5774 Control boiler pump/DHW diverting valve
Setpoint frost protection
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