38
VÄRMEBARONEN EP31 300
Troubleshooting
The electric boiler is operating
irregularly. It increases a few
stages and is then reduced
immediately, etc.
Water flow through the electric boiler too low.
Check that circulation pumps and valves are working.
This is an easy way to get an idea of the level of flow through the boiler:
a. Limit the power stages of the boiler so that the power is constant, for example to one
power stage.
b. Let the boiler's temperature become stable.
c. Measure the temperature increase between the flow and return lines of the boiler.
d. Calculate the flow through the boiler using the formula below.
e. Check against the details on page 7 whether the flow is adequate.
q =
P
∆
t x 1,16
q
=
water flow in m
3
/h. (m
3
/h x 1000/3600 = litres/second)
P
=
electric boiler's power output in kW
∆
t
=
temperature difference between the boiler's flow and return line in °C.
1.16 =
the water's thermal absorption coefficient.
Tables for temperature sensors
When the resistance of a temperature sensor is measured, it must be disconnected from the circuit board.
For voltage measurement of sensors J12, J13 and J14, there are measurement points on the circuit board at the connections.
The voltage of other temperature sensors is measured in their connection to the terminal block.
°C
Ω
V
°C
Ω
V
5 101,9526 0,4626
85 132,799
0,5862
10 103,9022 0,4706
90 134,7022 0,5936
15 105,849
0,4786
95 136,6026 0,6009
20 107,7928 0,4865
100 138,5
0,6083
25 109,7338 0,4944
105 140,3945 0,6156
30 111,6718 0,5023
110 142,2862 0,6228
35 113,607
0,5101
115 144,1749 0,6300
40 115,5392 0,5179
120 146,0608 0,6372
45 117,4686 0,5256
125 147,9437 0,6444
50 119,3951 0,5333
130 149,8237 0,6515
55 121,3186 0,5410
135 151,7009 0,6586
60 123,2392 0,5486
140 153,5751 0,6656
65 125,157
0,5562
145 155,4464 0,6727
70 127,0718 0,5637
150 157,3149 0,6797
75 128,9838 0,5712
155 159,1804 0,6866
80 130,8928 0,5787
160 161,043
0,6935
°C
k
Ω
V
°C
k
Ω
V
-30
46,95 4,3
5
6,83 2,4
-25
34,70 4,1
10
5,36 2,1
-20
25,89 3,9
15
4,24 1,8
-15
19,50 3,6
20
3,37 1,6
-10
14,82 3,3
25
2,70 1,3
-5
11,36 3,0
30
2,18 1,1
0
8,78 2,7
°C k
Ω
V
°C k
Ω
V
°C
k
Ω
V
5 141,9 4,670 45 24,55 3,552
85 5,871 1,849
10 111,6 4,588 50 20,21 3,344
90
5
1,666
15 88,31 4,491 55 16,72 3,128
95 4,273 1,496
20 70,31 4,377 60 13,89 2,907 100 3,665 1,341
25 56,33 4,246 65 11,6 2,685 105 3,155 1,199
30 45,39 4,097 70 9,723 2,464 110 2,724 1,070
35 36,79 3,931 75 8,187 2,250
40 29,98 3,749 80 6,92 2,044
Pt100 temperature sensor, o
ptional
Outdoor temperature sensor,
optional
Temperature sensors, J12, J13 and J14
