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1.2.2
Intended use
The GCU compact may only be used for the heating of hot water
heating systems. It may only be installed, connected and operated in
accordance with the information in this manual.
The GCU compact may only be operated with the integrated circula-
tion pump and only in conjunction with a controller system approved
by us.
Any other use beyond the intended use is considered as improper
and will result in a loss of warranty. The operator alone shall bear re-
sponsibility for any resulting damage.
The GCU compact is suitable for operation with natural gas E, nat-
ural gas LL and liquid gas (propane).
Gases from regenerative sources (e.g. biogas) may contain sub-
stances that cause corrosion of the gas valve and can impair its
function.
The gas composition must comply with the requirements on condi-
tions for feeding into the gas distribution grid (low-pressure
pipelines) of the public standard gas supply. Gases from regenerat-
ive sources (e.g. biogas) may only be used when they have been
previously prepared so that they can be fed into the public natural
gas grid in accordance with regional regulations.
Intended use also includes compliance with the maintenance and
service conditions. Replacement parts must at least satisfy the tech-
nical requirements defined by the manufacturer. This is the case,
for example, with original spare parts.
1.2.3
Installation room
WARNING
The plastic wall of the storage tank of the GCU compact
can melt under the effects of external heat (>80 °C) and, in
extreme cases, can catch fire.
▪ Only install the GCU compact at a minimum distance of
1 m to other heat sources (> 80 °C) (e.g. electrical
heater, gas heater, chimney) and combustible materials.
CAUTION
▪ Only install the GCU compact if sufficient load-carrying
capacity of the ground of 1050 kg/m
is ensured. The ground must be flat, horizontal and
level.
▪ Outdoor installation is not permissible.
▪ Installation in an explosion-risk environment is not per-
missible.
▪ The electronic control system must not be exposed to
weather effects such as rain and snow under any cir-
cumstances.
▪ The storage tank may not be exposed to continuous dir-
ect sunlight, as the UV radiation and the effects of the
weather will damage the plastic.
▪ The GCU compact must be installed protected from
frost.
▪ Operate the GCU compact only if sufficient combustion air supply
is ensured. If the GCU compact is operated as an ambient air-in-
dependent device with a concentric air/flue gas system (LAS) di-
mensioned according to our standard, this is automatically en-
sured and there are no further conditions regarding the installation
room. Only this method of operation is permissible for installation
in residential rooms.
▪ Make sure that there is an outside air opening of at least 150 cm
for ambient-air dependent or partial ambient-air independent oper-
ation.
Gas Combi Unit
Floor-standing gas condensing boiler with integrated heat storage
008.1543899_02 – 04/2019 – EN
▪ Do not operate the GCU compact in ambient-air dependent opera-
tion in rooms with aggressive vapours (e.g. hair spray, perchloro-
ethylene, carbon tetrachloride), strong dust formation (e.g. work-
shop) or high humidity (e.g. laundry).
▪ Avoid operating conditions that can cause heavy soiling of the
burner. Do not operate the device if temporary heavy dust depos-
its occur in the area of the air extraction system.
▪ Always ensure the minimum distances from walls and other ob-
jects (
1.2.4
▪ Electrical installations may only be carried out by electrical techni-
cians and in compliance with valid electrical guidelines as well as
the specifications of the responsible energy supply company.
▪ Compare the mains voltage (230 V, 50 Hz) indicated on the name-
plate with the supply voltage before connecting to the mains.
▪ Before beginning work on live parts, disconnect them from the
power supply (switch off main switch, remove fuse) and secure
against unintentional restart.
▪ Device covers and service panels must be replaced as soon as
the work is completed.
1.2.5
Damage due to deposits and corrosion: To avoid corrosion products
and deposits, observe the relevant technical regulations and locally
applicable requirements.
Measures for desalination, softening or hardness stabilisation are
necessary if the filling and top-up water have a high total hardness
2
plus safety margin
(>3 mmol/l - total of the calcium and magnesium concentrations, cal-
culated as calcium carbonate).
Minimum requirements regarding the quality of filling and supple-
mentary water:
▪ Water hardness (calcium and magnesium, calculated as calcium
carbonate): ≤ 3 mmol/l
▪ Conductivity: ≤ 1500 (ideal: ≤ 100) μS/cm
▪ Chloride: ≤ 250 mg/l
▪ Sulphate: ≤ 250 mg/l
▪ pH-values (heating water): 6.5 - 8.5
Measures for desalination, softening or hardness stabilisation or
other suitable conditioning measures are necessary to maintain the
required water quality if the filling and top-up water have a high total
hardness or other properties divergent from the minimum require-
ments.
Using filling water and top-up water which does not meet the stated
quality requirements can cause a considerably reduced service life
of the equipment. The responsibility for this lies solely with the oper-
ator.
2
1
General safety precautions
Chap.
4.1).
CAUTION
▪
If a DrainBack solar heating system is connected,
install the GCU compact far enough under the solar pan-
els to allow complete emptying of the solar heating sys-
tem. (Follow instructions in the DrainBack solar heating
system manual). An insufficient height difference may
lead to destruction of the DrainBack solar heating sys-
tem.
▪ The GCU compact must not be operated in rooms with
ambient temperatures above 40 °C.
Electrical installation
Requirements for the heating water
Installation and operating instructions
7
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