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Water fi lter
fi gure 12
i
NOTICE
24
If the installation resistance is over the stated value; the pump will rotate at maximum
capacity and the load will be adjusted until an acceptable temperature difference
between supply and return water has been obtained. If, after this, the temperature
difference is still not acceptable then the boiler will switch off and wait until an ac-
ceptable temperature has arisen.
If an unacceptable temperature is detected, the control will repeatedly try to achieve
water fl ow over the boiler. If not the boiler will switch off.
The electrical side of the external circulation pump (fi g. 8, pos. 2) can be connected
to the Control Tower. This pump thus switches simultaneously to the boiler pump.
The maximum absorbed current consumption of the external circulation pump may
not exceed 120V, 2 Amp. If a pump with a larger current draw is required an isolation
relay must be used. See the Rinnai Boiler applications manual for further information.
The extra external pump must be selected according to the installation resistance
and required fl ow.
As standard the boiler is provided with a water fi lter in the return pipe of the boiler (fi g.
12), so that debris from the central heating water is prevented from affecting the boiler.
The boiler is designed to be used on pressurized heating systems only (closed
loop).
QP85
14
12
10
8
6
4
2
0
0
2
UPER 20-58
pump index lines UPER 20-58
14
QP130
12
10
8
6
4
2
0
0
2
pump index lines UPER 20-78
4
6
Q [gallons/min]
25%
UPER 20-58
4
6
Q [gallons/min]
UPER 20-78
UPER 20-78
25%
100%
8
10
100%
Resistance Q 85
8
10
Resistance
Q 130
32.3
27.7
23.0
18.5
13.8
9.2
4.6
0
12
graph 1a
32.3
27.7
23.0
18.5
13.8
9.2
4.6
0
12
graph 1b
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