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Electric Combination Boiler User Manual
COMBI FEATURES
TABLE I: Cable cross-section areas and fuse power table according to the boiler powers
MODEL
Power
A
B
C
D
Cab
le
Cro
ss
Se
ctio
n
Are
a
Fu
se
Con
n
ectio
n
(A)
Volt
age
(V
)
kW
kcal/h
ÜEK 9
9
7.740
¾”
¾”
½”
½”
3x10
63
230 Single Phase
ÜEK 12
12
10.320
¾”
¾”
½”
½”
4x6
25
400 Three Phase
ÜEK 18
18
15.480
¾”
¾”
½”
½”
4x6
40
400 Three Phase
ÜEK 24
24
20.640
¾”
¾”
½”
½”
4x6
63
400 Three Phase
ÜEK 30
30
25.800
¾”
¾”
½”
½”
4x10
63
400 Three Phase
ÜEK 36
36
30.960
¾”
¾”
½”
½”
4x10
63
400 Three Phase
WARNINGS
Warning against Corrosion in Installation:
ÜNMAK electric combi boilers are extremely resistant to corrosion. However, all iron-based
components in the heating installation (including installation pipes and radiators) must be protected
against corrosion. Oxygen in the water is caused by oxidation of iron surfaces resulting in a loss of
material and rust.
During the initial filling of the installation, the accumulated air must be evacuated. Usually, if the
necessary precautions are taken after the first filling, there is no damage caused by the oxygen in the
water. Oxidation is mostly caused by oxygen which is involved in the heating water during operation.
Leaks in the system cause oxygen to be added to the heating water. Therefore, the lowest water
pressure in the closed expansion tank system should be higher than the atmospheric pressure and the
periodic control of the operating pressure is required.
