42
Flow switch switching point, factory-set
Vitocal
Nominal flow rate Minimum flow
rate
Switching point
Type
m
3
/h
m
3
/h
m
3
/h
LED
WW
301.BS125
WW
302.BS125
29.55
21.30
20 .. 22
0
1
2
3
4
5
6
7
8
9
WW
301.BS155
WW
302.BS155
35.00
26.40
25 .. 27
0
1
2
3
4
5
6
7
8
9
WW
302.BS200
45.60
33.10
30 .. 33
0
1
2
3
4
5
6
7
8
9
WW
302.BS250
57.10
42.50
41 ..43
0
1
2
3
4
5
6
7
8
9
WW
302.BS300
70.00
52.90
50 .. 54
0
1
2
3
4
5
6
7
8
9
Carry out an operating display adjustment (high flow balancing, if required)
The high flow balancing establishes the existing
(higher) flow rate as the nominal flow rate.
Note
The high flow balancing can shift the switching point of
the flow switch.
1. Start the appliance with the existing flow rate.
2. Hold down for around 5 s until LED "9" flashes.
3. Release .
Checking the electronic frost stat, type AC1-2W
Fig.27
The electronic frost stat monitors the refrigerant tem-
perature on entry into the evaporator.
Note
The frost stat switching points are factory-set.
Adjusting these switching points is possible in special
cases, for example if the flow temperature of the pri-
mary circuit (groundwater inlet into the heat pump) is
subject to severe fluctuations.
Frost stat switching point, delivered condition:
1SP = -1 °C
Open switching contact:
Frost protection enabled, compressor switches
off (message
"CA Protectn device primry"
; see
service instructions Vitotronic 200, type WO1C).
1HY = 3 K
At 1SP + 1HY = 2 °C switching contact closed:
Heat pump in standby mode.
Installation sequence
Checking the electronic flow switch, type IFM
(cont.)
5549 991 GB
Installation
Summary of Contents for 301.BS090
Page 99: ...99 5549 991 GB...
