Commissioning; Filling - State Water Heaters SUF 120-300 Installation, User And Service Manual

7.7.3.4
7.8
7.8.1
7.8.1.1
7.8.1.2
0311720_SUF_120-500_III_UKUK_V2.0 , 2017-08-01
1. Connect leads (X3 and X4) to terminals 21 and 22 according to the table (see section
7.7.1).
2. Fit the cable in the strain relief.
3. If you have no more connections to make:
- Fit the cover on the terminal block.
- Fit the covers onto the water heater.
Additional error signal
The appliance has a relay terminal that is switched when an error is detected. This can be
used to signal errors, for example with a bulb. A 230V circuit can be powered directly.
Other voltages require a relay prescribed by the manufacturer.
1. Connect the phase cables (X1 and X2) to points 10 and 11 according to the table
(see section 7.7.1). If required, connect earth (A) to terminal 12.
2. Fit the cable in the strain relief.
3. If you have no more connections to make:
- Fit the cover on the terminal block.
- Fit the covers onto the water heater.

Commissioning

To commission the water heater:
1. Fill the water heater (see section 7.8.1)
2. Check the supply pressure (see section 7.8.2)
3. Check the gas control valve pressure (see section 7.8.3)
4. Measure the CO (see section 7.8.4)
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5. Switch pressure measurement (see section 7.8.5)
6. Turn on the water heater (see section 7.8.6)

Filling

Filling unvented installations
Refer to the installation diagram when you fill the water heater:
1. Open the stop valve (11) in the hot water supply pipe.
2. If applicable, open the stop valves (4) of the circulation pipe (C).
3. Make sure that the drain valve (9) is closed.
4. Open the nearest hot water draw-off point (14).
5. Open the stop valve (4) of the cold water supply pipe (A). Cold water flows into the
water heater.
6. Fill the water heater until a full water jet flows from the nearest draw-off point. The
water heater is completely full.
7. Open all draw-off points to bleed the entire installation of air.
The water heater is now under water supply pressure.
8. Make sure that no water comes out of the expansion valve (15) or the T&P valve (3).
If water comes out:
- Examine if the water supply pressure is greater than the specified value in the
Technical details. If necessary, install a pressure reducing valve (1).
- Examine if the expansion valve in the protected cold supply set-up is installed
correctly and is not defect. If necessary, replace the expansion valve.
Filling vented installations
To fill the water heater, proceed as follows:
1. Open the stop valve (11) in the hot water pipe and, if present, the stop valves (4) for
the circulation pump (6).
2. Close the drain valve (9).
3. Open the nearest hot water draw-off point (14).
4. Open the stop valve (4) on the cold water side (A) so that cold water flows into the
water heater.
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