Start-Up; General Information; Preparation; Start-Up Procedure - Buderus WPS 50MRE Montage- Und Gebrauchsanweisung

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8

Start-up

8.1 General Information

To ensure that start-up is performed correctly, it should only be
carried out by an after-sales service technician authorized by the
manufacturer. Only then can an extended warranty period of 3
years in total be granted (see Warranty Service). Start-up should
be carried out in heating operation.

8.2 Preparation

The following items need to be checked prior to start-up:
All of the heat pump connections must be established as de-
scribed in Chapter 7.
The heat source system and the heating circuit must have
been filled and checked.
The dirt trap must have been inserted in the brine inlet of the
heat pump.
All valves that could impair proper flow in the brine and heat-
ing circuits must be open.
The heat pump controller must be adapted to the heating
system in accordance with the controller's operating instruc-
tions.

8.3 Start-Up Procedure

The heat pump is started up via the heat pump controller.
ATTENTION!
The heat pump must be started up in accordance with the installation and
operating instructions of the heat pump controller.
If an overflow valve is fitted to maintain the minimum heating
water flow rate, the valve must be adapted to the requirements of
the heating system. Incorrect adjustment can lead to faulty oper-
ation and increased energy consumption. We recommend carry-
ing out the following procedure to correctly adjust the overflow
valve:
Close all of the heating circuits that may also be closed during
operation (depending on the type of heat pump usage) so that
the most unfavourable operating state - with respect to the water
flow rate - is achieved. This normally means the heating circuits
of the rooms on the south and west sides of the building. At least
one heating circuit must remain open (e.g. bathroom).
The overflow valve should be opened far enough to produce the
maximum temperature spread between the heating flow and re-
turn flow listed in the table below for the current heat source tem-
perature. The temperature spread should be measured as close
as possible to the heat pump. The heating element of mono en-
ergy systems should be disconnected.
Heat source
temperature
From To
-5 °C 0 °C
1° C 5° C
6° C 9° C
10° C 14° C
15° C 20° C
21° C 25° C
E-6
Max. temperature spread
between heating flow and
return flow
10 K
11 K
12 K
13 K
14 K
15 K
Any faults occurring during operation are displayed on the heat
pump controller and can be corrected as described in the heat
pump controller's operating instructions.
9 Maintenance and
Cleaning

9.1 Maintenance

The heat pump is maintenance-free. To prevent faults due to
sediment in the heat exchangers, care must be taken to ensure
that no impurities can enter either the heat source system or the
heating system. In the event that operating malfunctions due to
contamination should occur, the system should be cleaned as
described below.

9.2 Cleaning the Heating System

The ingress of oxygen into the heating water circuit may result in
the formation of oxidation products (rust), particularly if steel
components are used. These products enter the heating system
via the valves, the circulating pumps and/or plastic pipes. It is
therefore essential - in particular with respect to the piping of un-
derfloor heating systems - that only diffusion-proof materials are
used.
ATTENTION!
We recommend the installation of a suitable corrosion protection system
to prevent the formation of deposits (e.g. rust) in the condenser of the
heat pump.
Residue from lubricants and sealants may also contaminate the
heating water.
In the case of severe contamination leading to a reduction in the
performance of the liquifier in the heat pump, the system must be
cleaned by a heating technician.
According to today's state of knowledge, we recommend using a
5 % phosphoric acid solution for cleaning purposes. However, if
cleaning needs to be performed more frequently, a 5 % formic
acid solution should be used.
In either case, the cleaning fluid should be at room temperature.
We recommend flushing the heat exchanger in the direction op-
posite to the normal flow direction.
To prevent acidic cleaning agents from entering the heating sys-
tem circuit, we recommend connecting the flushing device di-
rectly to the flow and return flow of the liquifier. It is important that
the system be thoroughly flushed using appropriate neutralising
agents to prevent any damage from being caused by cleaning
agent residue remaining in the system.
Acids must be used with great care and all relevant regulations of
the employers' liability insurance associations must be adhered
to.
If in doubt, contact the manufacturer of the chemicals!