Checking The Electronic Frost Stat, Type Ac1-2W - Viessmann KWT Vitocal 300-G Pro Installation And Service Instructions Manual

Check electronic flow switch, type IFM
Flow switch switching point, factory-set
Vitocal Nominal flow rate Minimum flow
Type
m 3 /h
WW 301.B125
WW 302.B125
WW 301.B155
WW 302.B155
WW 302.B200
WW 302.B250
WW 302.B300
Carry out an operating display adjustment (High Flow balancing, if required)
The High Flow balancing establishes the existing
(higher) flow rate as nominal flow rate.
Note
The High Flow balancing can shift the switching point
of the flow switch.

Checking the electronic frost stat, type AC1-2W

Fig.41
The electronic frost stat monitors the refrigerant tem-
perature on entry into the compressor.
Setting the frost stat switching points (if required)
Press the following keys:
1. Hold down
+ simultaneously for 5 s; the 1st
parameter is displayed.
2.
/ for the required parameter.
3.
, to show the set value.
rate
m 3 /h
29.55 21.30
35.00 26.40
45.60 33.10
57.10 42.50
70.00 52.90
Commissioning, inspection, maintenance
(cont.)
Switching point
LED
m 3 /h
20 .. 22
0 1 2
25 .. 27
0 1 2
30 .. 33
0 1 2
41 ..43
0 1 2
50 .. 54
0 1 2
1. Start the appliance with the existing flow rate.
2. Hold down for around 5 s, until LED "9" flashes.
3. Release .
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
itself 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.
4. Hold down
and simultaneously set the required
value with / .
5. Release
to save the set value.
6. Press or wait 30 s to exit the menu.
3 4 5 6 7 8
3 4 5 6 7 8
3 4 5 6 7 8
3 4 5 6 7 8
3 4 5 6 7 8
9
9
9
9
9
65