Basic Documentation

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Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies Frost protection (basic types A and P) 03.10.2011
17 Frost protection (basic types A and P)
Protects the hot water heating coils against freezing.
The following types of frost protection are available:
Frost protection
N.X1
x
Frost
 Frost protection unit
 2-speed frost protection
on the air side
 2-stage frost protection on
the water side
Frost protection units 1..3
N.X1
x
Frost 1
N.X1
x
Frost 2
N.X1
x
Frost 3
 Frost protection units 1..3
(acts directly on the
corresponding control
loops 1..3)
Note that frost protection control cannot protect the plant against frost damage if
there is insufficient heat output (e.g. no heating water).
17.1 Activate block
Activate the function by setting the identifier for an input to "Frost protection" or
"Frost protection 1..3" (see section 8.1 "Universal inputs").
Main menu > Commissioning > Extra configuration > Input identifier >
Function block Operating line Range
N.X1
x
Frost
...X... Activate "Frost protection" function by
assigning the input the "Frost" value
N.X1
x
Frost 1
N.X1
x
Frost 2
N.X1
x
Frost 3
...X... Activate the function by assigning the
input for the value "Frost protection
unit 1", "Frost protection unit 2" and/or
"Frost protection unit 3"
Main menu > Commissioning > Settings > .... or
Main menu > Settings > Frost protection >
Operating line Range Factory setting
Identification Monitor,
Active DC 0...10 V = 0...15 °C (air side),
Passive LG-Ni 1000 (water side)
Monitor
Risk of frost limit
50.0...50.0 °C
5.0 °C
P-band Xp 1.0…100.0 K 5.0 K
Plant OFF frost protection setp
50.0...50.0 °C
20.0 °C
Plant OFF Xp 0.5...999.5 K 7.0 K
Plant OFF Tn 00.00...59.55 m:s 03.30 m:s
Control loop with risk of frost Controller 1...3 Controller 1
You can use the settings for "Identification" and "Control loop with risk of frost" for
the frost protection function.
Configuration
Setting values for frost
protection
Note