Flexit SPIRIT UNI 3, SPIRIT UNI 4 Installation Manual
Installation manual
Water heating element
FLEXIT SPIRIT
110869E-08
2015-06
ART. NO.:
110863
110948
2
Water heating element installation manual
Contents
1 Technical data 3
1.1 UNI 3 3
1.2 UNI 4 3
1.3 Capacity and sound data, supply air side, UNI 3 4
1.4 Capacity and sound data, supply air side, UNI 4 4
2 Plumbing 5
2.1 Shunt valves 5
2.2 Location of the water heating element 5
2.3 Connections 6
2.4 Venting 6
2.5 Frost risk 6
2.6 Dimensions 6
3 Electrical work 7
3.1 Uni 3-4 7
3.6 Frost sensor (B5) 8
3.7 DIP switch 8
4 Maintenance 8
5 Appendix 1 8
Our products are subject to continuous development and we therefore reserve the right to make changes.
We also disclaim liability for any printing errors that may occur.
To obtain correct values, employ the Flexit
calculation application available at our home
page www.fl exit.no
3
1.1 UNI 3
Water heating element art.no. 110948 has the highest
capacity of Flexit’s water heating elements. It is designed
for systems with air flow rates of more than 280 m3/h, and
where outdoor temperatures can go below -20°C.
For other conditions, use art.no 110863.
High capacity element: example 1
Air flow rate: 350 m³/h
Power consumption: 1,28kW
Temperature, incoming water °C 60 50
Temperature, outgoing water °C 36,56 35,22
Water flow l/h 44 69
Water speed m/s 0,26 0,4
Pressure drop, water side kPa 1,39 3,18
Valve presssure drop kPa 3 7,6
Capacity kW 1,28 1,28
Pipe connection thread DN15 DN15
Valve KVS 0,25 0,25
Normal capacity element: example 2
Air flow rate: 216
m³/h
Power consumption: 0,58kW
Temperature, incoming water °C 80 70 60 50
Temperature, outgoing water °C 57,64 53,3 49 44,7
Water flow l/h 23 31 47 96
Water speed m/s 0,14 0,18 0,27 0,56
Pressure drop, water side kPa 0,25 0,42 0,91 3,44
Valve presssure drop kPa 0,33 0,6 1,38 5,76
Capacity KW 0,58 0,58 0,58 1,28
Pipe connection thread DN15 DN15 DN15 DN15
Valve KVS 0,4 0,4 0,4 0,4
Normal capacity element: example 3
Air flow rate: 350 m³/h
Power consumption: 1,28kW
Temperature, incoming water °C 80 70
Temperature, outgoing water °C 66,38 63,03
Water flow l/h 84 164
Water speed m/s 0,49 0,96
Pressure drop, water side kPa 2,47 8,47
Valve presssure drop kPa 4,41 16,8
Capacity kW 1,28 1,28
Pipe connection thread DN15 DN15
Valve KVS 0,4 0,4
Water heating element installation manual
1.2 UNI 4
Air flow rate: 470 m3/h
Power consumption: 1,72kW
Temperature,
incoming water
°C 80 70 60 50
Temperature,
outgoing water
°C 41 40,4 39,73 38,98
Water flow l/h 39 52 75 138
Water speed m/s 0,23 0,3 0,44 0,81
Pressure drop, water
side
kPa 1,09 1,8 3,58 10,77
Valve presssure drop kPa 0,9 1,7 3,5 11,9
Capacity kW 1,75 1,75 1,75 1,75
Pipe connection Gjenger DN15 DN15 DN15 DN15
Valve KVS 0,4 0,4 0,4 0,4
4
Water heating element installation manual
Contact resistance [Pa]
Power consumption [W]
Air flow rate [l/s]
Air flow rate [m
³/h]
Water battery
Fig. 2
Yellow fi eld:
SFP < 1.0 per fan
60dB (A)
65dB (A)
100%
100%
80%
80%
60%
60%
40%
40%
70dB (A)
75dB (A)
80dB (A)
[Pa]
0
1000 200 300 400
-10 -25
-55
-90
0
20 40 60 80
60
80
100
40
20
0
1000
200
400
100
300
500
1.3 Capacity and sound data, supply air side, UNI 3
1.4 Capacity and sound data, supply air side, UNI 4
Contact resistance [Pa]
Power consumption [W]
Air flow rate [l/s]
Air flow rate [m
³/h]
Water battery
Yellow fi eld:
SFP < 1.0 per fan
Fig. 3
65dB (A)
70dB (A)
100%
100%
80%
80%
60%
60%
40%
40%
75dB (A)
80dB (A)
85dB (A)
1000 200 300 400 500 600 700
[Pa]
-100 -25
-55
-90
100
200
75
50
25
0
175
150
125
20 40 60 80 1000 140 160 180 200120
0
200
400
100
300
500
600
700
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