3
x
Product description
Daikin EKHWP/EKHWC/EKHWD
Daikin High-efficiency hot water storage tank
008.1618744 – 03/2017
Installation and operating instructions
13
3.2
Brief description
The Daikin high-performance-hot water storage tank is a combi-
nation of a heat storage tank and instantaneous water heater.
The pressureless storage water serves as heat storage medium.
Useful heat is supplied and removed via the spiral corrosion-re-
sistant heat exchanger, which is made from a corrugated
stainless steel pipe (1.4404), and is completely immersed in the
storage tank water. In the heat exchanger for domestic hot water
generation, domestic hot water is stored at the temperature level
of the preparation zone.
The cold water which flows out when the hot water is removed is
first routed to the storage tank at the very bottom of the heat ex-
changer, where it cools the lower area of the storage tank down
as much as possible. The readiness zone is heated by an ex-
ternal heat generator (condensing boiler, heat pump, solar
system, electric immersion heater). Water flows through the heat
exchanger for storage charging (SL-WT) from top to bottom.
On its way to the top, the domestic water continuously absorbs
the heat of the storage tank water. The flow direction, operating
on the principle of counter-flow, and the coil-shaped heat ex-
changer create a pronounced temperature 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.
The Daikin high-performance-hot water storage tanks EKHWP /
EKHWC can also be solar heated, in addition to by an external
heat generator. Depending on the available heat from the sun,
the entire hot water storage tank can be heated up. The stored
heat is now used both for hot water generation and for heating
support. The high total storage capacity also temporarily allows
time without sunshine to be bridged.
If a Daikin heat pump system is used as an external heat gen-
erator, the primary hot water storage tank can only be one of the
"hot water storage tanks for heat pump systems" listed in chap.
3.1.1 or 3.1.2.
Optimum water hygiene
Low flow or unheated zones on the domestic water side are com-
pletely excluded with the Daikin high-performance-hot water
storage tank. It is impossible for sludge, rust or other sediments
to be deposited, as can be the case with other large volume
tanks. The water which is fed into the system first is also dis-
charged first (first in, first out principle).
Low maintenance and corrosion
The Daikin high-performance hot water storage tank is made of
plastic and is completely corrosion free. No sacrificial anode or
similar corrosion protection system is necessary. This means that
associated maintenance work, e.g. changing the protective
anodes or cleaning the storage tank, does not need to be carried
out on the Daikin high-performance-hot water storage tank. Only
the fill level of the storage tank water needs to be checked.
The corrugated stainless steel pipe heat exchangers on the
heating and potable water side are made from high quality
stainless steel (1.4404).
Low scaling
On the storage tank side only one deposition of scale is possible.
The immersion heater therefore remains clean, as do all the
stainless steel heat exchanger pipes in the storage tank water.
This means that no scale can build up which would continuously
reduce the efficiency of heat transfer in the course of operation
(as is the case with other storage tank designs).
The thermal and pressure expansion and high flow rates in the
domestic water heat exchanger release any possible scale de-
posits, which are then flushed away.
Economical operation
The full area heat insulation of the storage tank ensures very low
heat losses in use and means that the best use is made of the
heat energy being applied.
Modular extension facility
If the heat output of a single Daikin high-performance hot water
storage tank is not adequate you can modularly interconnect
several storage tanks.
Electronic control
A control system integrated in the heat generator controls all
heating and hot water functions for the direct heating circuit, a
mixed heating circuit which can be connected as an option and a
storage tank charging circuit.
3.3
Scope of delivery
– Daikin EKHWP / EKHWC / EKHWD hot water storage tank
– Bag of accessories (see fig. 3-5)
A
Carrier loops (only required
for transport)
B
Cover screen
C
Hose connection piece for
safety overflow
D
Spanner
Fig. 3-5
Content of bag of accessories
Summary of Contents for EKHWP300B
Page 2: ......
