Maintenance And Cleaning; Maintenance; Cleaning The Heating System - Buderus WPL 60IMRRE Montageanleitung Und Gebrauchsanweisung

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 following table for the current heat source
temperature. The temperature spread should be measured as
close as possible to the heat pump. The heating element of mono
energy systems should be disconnected.
Heat source
temperature
between heating flow and return
From To
-20 °C -15 °C
-14 °C -10 °C
-9 °C -5 °C
-4 °C 0 °C
1 °C 5 °C
6 °C 10 °C
11 °C 15 °C
16 °C 20 °C
21 °C 25 °C
26 °C 30 °C
31 °C 35 °C
Any faults occurring during operation are also displayed on the
heat pump controller and can be corrected as described in the
operating instructions of the heat pump controller.
For external temperatures below 10 °C and heating water tem-
peratures below 16 °C, the buffer tank should be heated up with
the 2nd heat generator to at least 25 °C.
Observe the following procedure to implement a smooth start-up:
1) Close all of the heating circuits.
2) Fully open the overflow valve.
3) Use the controller to select the automatic operating mode.
4) Wait until the buffer tank has reached a temperature of
at least 25 °C.
5) Now slowly reopen the heating circuit valves in succession
so that the heating water throughput is constantly raised by
slightly opening the respective heating circuit. The heating
water temperature in the buffer tank must not be allowed to
drop below 20 °C during this process. This ensures that the
heat pump can be defrosted at any time.
6) Set the minimum volume flow quantity on the overflow valve
and heat circulating pump when all heating circuits are fully
open and a heating water temperature in the buffer tank of
approx. 20 °C is maintained.
7) New buildings have an increased heat consumption on ac-
count of the energy required to dry them out. This increased
heat consumption means that marginally dimensioned heat-
ing systems can not always achieve the desired room tem-
perature. In such cases, we recommend keeping a 2nd heat
generator on standby during the first heating period. The
limit temperature on the heat pump controller should also be
turned up to 15 °C.
Max. temperature spread
flow
4 K
5 K
6 K
7 K
8 K
9 K
10 K
11 K
12 K
13 K
14 K
8 Maintenance and
Cleaning

8.1 Maintenance

Avoid leaning or putting objects on the device in order to protect
the paintwork. The external parts of the heat pump can be wiped
with a damp cloth and domestic cleaner.
ATTENTION!
Never use cleaning agents containing sand, soda, acid or chloride
because these could damage surfaces.
To prevent faults due to sediment in the heat exchanger of the
heat pump, ensure that the heat exchanger in the heating system
can not be contaminated. We recommend protecting the evapo-
rator by installing a bird guard in the inlet duct. At least
80 % of the cross section of the grating should be open. In the
event that operating malfunctions due to contamination occur
nevertheless, the system should be cleaned as described below.

8.2 Cleaning the Heating System

The ingress of oxygen into the heating water circuit, in particular
if it contains steel components, may result in the formation of ox-
idation products (rust). These can enter the heating system via
valves, circulating pumps or plastic tubing. It is therefore impor-
tant - in particular with respect to the piping of underfloor heating
systems - that the installation be executed in a diffusion-proof
manner.
ATTENTION!
To prevent the accumulation of deposits (e.g. rust) we recommend using
a suitable corrosion protection system.
In the case of severe contamination leading to a reduction in the
performance of the condenser in the heat pump, the system must
be cleaned by a heating technician.
Based on current knowledge, we recommend cleaning with a 5%
phosphoric acid solution or, in the case that cleaning needs to be
performed more frequently, with a 5% formic acid solution.
In either case, the cleaning fluid should be at room temperature.
It is recommended that the heat exchanger be cleaned in the di-
rection opposite to the normal flow direction.
To prevent acidic cleaning agents from entering the circuit of the
heating installation we recommend that the flushing device be fit-
ted directly to the supply and return lines of the condenser of the
heat pump.
Thereafter the system must be thoroughly flushed using appro-
priate neutralising agents in order to prevent any damage caused
by cleaning agent residues that may still be present in the sys-
tem.
All acids must be used with great care, all relevant regulations of
the employers' liability insurance associations must be adhered
to.
If in doubt, contact the manufacturer of the chemicals!
The buffer tank is drained using the filling and drain cocks on the
lower left of the device. Also open the ball valve on the pressure
expansion vessel to vent the buffer tank.
8.2
E-7