Product Description; Brief Description; Mode Of Operation - Daikin EHSX04P30A Operating Instructions Manual

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Product description

2.1 Brief description

The air-water heat pump system uses the physical effect of con-
densation and latent heat and makes it possible as required to
heat or cool buildings. The Daikin Altherma EHS(X/H) (Altherma
integrated solar unit) is the primary component of the highly-effi-
cient heating- and cooling system for domestic applications.
Located in the external heat pump unit (ERLQ) are the coolant
compressor and a finned heat exchanger, which, in heating
mode, acts as a vaporiser and extract heat from the ambient air.
In cooling mode this acts as a condensator and returns heat to
the environment (refrigerator principle).
The heat pump external unit is connected to the heat pump in-
ternal unit in the building by means of a closed coolant circuit.
Heat or cold is transported between the heat pump external unit
and the heat pump internal unit by means of the circulating refrig-
erant, which alternately takes on the liquid and gaseous phases.
The internal heat pump unit contains the control devices, the heat
exchanger and integrated storage tank. In the heat exchanger,
the heat is transferred to the water flowing in the heating circuit or
the water in the storage tank (heating/hot water supply), or heat
is extracted from the water (cooling).
The storage tank on the Daikin Altherma EHS(X/H) is built in such
a way to enable the heat pump system to be combined with a
Daikin solar system without needing an additional hot water tank.
With optional solar heating, the entire hot water storage tank can
be heated, depending on the heat offered by the sun. The stored
heat is used both for hot water heating and for heating support.
The high total storage capacity also temporarily allows time
without sunshine to be bridged. The excellent heat insulation
properties of the integrated storage tank also ensure that heat
losses are kept to a minimum. This allows efficient and economic
water heating and also solar support.
If the heating capacity of the Altherma EHS(X/H) is not adequate,
the optional backup heater (EKBUxx) can provide additional
heating capacity for heating the heating circuit.
In order to make more cost effective use of the Daikin Altherma
EHS(X/H), it can be operated on a low tariff network connection
(HT/NT) or with an intelligent controller (SMART GRID). Here the
energy supply company (EVU) is afforded the opportunity to
control their network utilisation by changing the heat pump oper-
ating mode. Information on the prerequisites and connection pos-
sibilities are described in the enclosed installation manual.
Daikin Altherma EHS(X/H)
Daikin Altherma integrated solar unit
008.1420944 – 05/2014
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2.1.1 Mode of operation

In room heating mode the refrigerant which was compressed in
the refrigerant compressor in the heat pump external unit con-
denses in the plate heat exchanger in the heat pump internal unit.
The heat released during the liquefaction of the coolant is trans-
ferred to the heating water in the plate heat exchanger. The heat
circulating pump ensures the required flow of the heating water in
the internal hear generation circuit.
The lower the required temperature in the heating cir-
cuit, the more effectively the heat pump works.
It is, in particular, possible to achieve the lowest flow
temperatures possible with under-floor heating, as the
heat transfer surface is very large. Furthermore, the
building to be heated should ideally have extremely
good heat insulation, so that when there is a low heat
requirement, the heat carrier can run with a low flow
temperature.
The hot water zone of the storage tank integrated into the interior
heat pump unit is heated by the heat pump or other external heat
generators (solar system, backup heater. The cold water flowing
downstream of the hot water extraction cools the lower area of
the integrated storage tank to maximum effect.
The drinking water is heated indirectly in a corrosion resistant
stainless steel corrugated pipe heat exchanger by the unpres-
surised water from the integrated storage tank. On its way to the
top, it continuously absorbs the heat from the storage tank water.
The flow direction, operating on the principle of counter-flow, and
the coil-shaped heat exchanger create a pronounced temper-
ature layering in the hot water storage tank. As high temperatures
can be maintained for a very long time in the upper section of the
storage tank, a high hot water output is achieved even if water is
drawn off over a long period of time.
In the case of room cooling the 3-way switching valves
(3UV1 + 3UVB) mounted on the heat pump internal unit switches
off the flow to storage tank charging/heating support. The heat
circulation pump of the heat pump internal device now operates
exclusively within the heating circuit.
The cooling process now takes place by inverting the heat pump
process in the heat pump external unit. Thus the heat exchanger
of the heat pump internal unit acts as a vaporiser and extracts
heat from the heating water that flows through it. This cools the
heating circuit.
Product description
Operating instructions
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