Manual Dimplex WI 9 TE (page 23 of 64) (English, German, French)

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www.dimplex.de 452232.66.11 · FD 9201 EN-9

English

WI 9TE - WI 27TE

8 Commissioning

8.1 General Information

To ensure that start-up is performed correctly, it should only be

carried out by an after-sales service technician authorised by the

manufacturer. This may be a condition for extending the guaran-

tee (see Warranty Service).

8.2 Preparation

The following items need to be checked prior to start-up:

The heat pump must be fully connected, as described in

Chapter 6.

The heat source system and the heating circuit must have

been filled and checked.

All valves that could impair proper flow in the well and heat-

ing circuits must be open.

The heat pump manager 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 manager.

ATTENTION!

The heat pump must be started up in accordance with the installation and

operating instructions of the heat pump manager.

If an overflow valve is fitted to assure the minimum heating water

flow rate, the valve must be set in accordance with the require-

ments of the respective heating system. Incorrect adjustment

can lead to faulty operation and increased energy consumption.

We recommend carrying 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 during start-up.

9 Maintenance and

Cleaning

9.1 Maintenance

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 op-

erating malfunctions due to contamination occur nevertheless,

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. This oxygen enters the heating system via

the valves, the circulating pumps and/or plastic pipes. It is there-

fore essential - in particular with respect to the piping of under-

floor heating systems - that only diffusion-proof materials are

used.

NOTE

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. We recommend equipping diffusion-open heating systems

with an electrophysical anti-corrosion system (e.g. ELYSATOR system).

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!

9.3 Cleaning the Heat Source

System

A dirt trap is inserted in the heat source inlet of the heat pump to

protect the evaporator against the ingress of impurities. When

the system is first put into operation, the filter screen of the dirt

trap should be cleaned in relatively short intervals. These inter-

vals can be prolonged once the amount of impurities decreases.

Heat source

temperature

Max. temperature spread

between heating flow and return

flow

From To

7° C 12° C 10 K

13° C 18° C 11 K

19° C 25° C 12 K

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Dimplex WI 9 TE Manual

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