Drain The Product And Heating Installation; Replacing The Pump; Replacing The Heat Exchanger - Vaillant eloBLOCK VE 14 EU I Series Installation And Maintenance Instructions Manual

10.3

Drain the product and heating installation

1. Secure a hose to the heating installation's draining
device.
2. Route the free end of the hose to a suitable drainage
point.
3. Open all service valves in the heating flow and heating
return.
4. Open the drain cock.
5. Open the purging valves on the radiators. Start from
the highest radiator and then work from the top to the
bottom.
6. Once the water has drained, close the purging valves
on the radiators, the service valves in the heating flow,
heating return and in the cold water supply, and the
drain cock again.
10.4

Replacing the pump

4 3 2
1. Disconnect the connection cable to the pump from the
PCB (1).
2. Undo the screwed connection for the return (2) to the
heat exchanger.
3. Undo the screwed connection for the line (4) to the ex-
pansion vessel.
4. Remove the safety clip (3).
5. Undo the pump's fixing screw (1) on the underside of
the product.
6. Carefully turn the pump clockwise so that it can be re-
moved from the product.
7. When you install the new pump, use new seals (O-rings
coated with a water-based lubricant).
8. Check all water-bearing connections for leak-tightness
and check that the plug connections are firmly seated.
0020265768_01 eloBLOCK Installation and maintenance instructions
Inspection and maintenance 10
10.4.1 Checking that the pump works correctly
1. Check that the pump status LED is functioning cor-
rectly.
Pump status LED (→ Page 23)
2. Loosen the cap on the automatic air vent.
3. Clean the rotor and the housing.
4. Reinstall the motor.
5. Screw the cap onto the automatic air vent.
10.5

Replacing the heat exchanger

1
1. Remove the side casing (→ Page 8) and the casing
from the top of the product.
2. Disconnect the immersion heater cable connection to
the PCB and to the mains terminal block (N, blue).
3. Unscrew the earth wire.
4. Undo the heating return's fixing screw (1) on the base of
the heat exchanger.
1
5. Undo the heating flow's fixing screw (2) on the upper
side of the heat exchanger.
6. Remove both screws (1) from the upper side of the heat
exchanger.
7. Remove the complete heat exchanger upwards from
the product.
1
1
2
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