Daikin EHYKOMB33AA2 [19/136] Preparation
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Daikin EHYKOMB33AA2 [19/136] Preparation

Daikin EHYKOMB33AA2A [19/136] Preparation
6 Preparation
Installer reference guide
19
EVLQ05+08CAV3 + EHYHBH05AA + EHYHBH/X08AA +
EHYKOMB33AA
Daikin Altherma hybrid heat pump
4P355634-1A – 2016.02
▪ Piping length. It is recommended to avoid long runs of piping
between the domestic hot water tank and the hot water end point
(shower, bath,…) and to avoid dead ends.
▪ Piping diameter. Select the water piping diameter in relation to
the required water flow and the available external static pressure
of the pump. See "15Technical data"on page96 for the external
static pressure curves of the indoor unit.
▪ Water flow. You can find the minimum required water flow for
indoor unit operation in the following table. In all cases, this flow
needs to be guaranteed. When the flow is lower, the indoor unit
will stop operation and display error 7H.
Minimum required flow rate
05 models 7l/min
08 models 8l/min
▪ Field supply components – Water. Only use materials that are
compatible with water used in the system and with the materials
used in the indoor unit.
▪ Field supply components – Water pressure and temperature.
Check that all components in the field piping can withstand the
water pressure and water temperature.
▪ Water pressure. The maximum water pressure is 3bar. Provide
adequate safeguards in the water circuit to ensure that the
maximum pressure is NOT exceeded.
▪ Water temperature – Heat pump convectors. In case heat
pump convectors are connected, the temperature of the water in
the convectors should NOT exceed 65°C. If necessary, install a
thermostatic controlled valve.
▪ Water temperature – Underfloor heating loops. In case
underfloor heating loops are connected, install a mixing station to
prevent water that is too hot from entering the underfloor heating
circuit.
▪ Water temperature. All installed piping and piping accessories
(valve, connections,…) MUST withstand the following
temperatures:
INFORMATION
The following illustration is an example and might NOT
match your system layout.
M
89°C
RAD1 RAD2 RAD3
95°C
65°C
a b d e
j
k
i
c f g
FCU1
FCU2
FCU3
hg
a Outdoor unit
b Indoor unit
c Heat exchanger
d Boiler
e Bypass valve
f Pump
g Shut-off valve (field supply)
h Motorised 3-way valve (in option kit)
i Collector
j Domestic hot water tank (optional)
k Heat exchanger coil
FCU1...3 Fan coil unit (optional)
RAD1…3 Radiator (field supply)
▪ Drainage – Low points. Provide drain taps at all low points of the
system in order to allow complete drainage of the water circuit.
▪ Drainage – Pressure relief valve. Provide a proper drain for the
pressure relief valve to avoid water coming into contact with
electrical parts.
▪ Air vents. Provide air vents at all high points of the system, which
must also be easily accessible for servicing. An automatic air
purge is provided in the indoor unit. Check that the air purge is
NOT tightened too much, so that automatic release of air in the
water circuit is possible.
▪ Zn-coated parts. Never use Zn-coated parts in the water circuit.
Because the unit's internal water circuit uses copper piping,
excessive corrosion may occur.
▪ Non-brass metallic piping. When using non-brass metallic
piping, insulate the brass and non-brass properly so that they do
NOT make contact with each other. This to prevent galvanic
corrosion.
▪ Valve – Separating circuits. When using a 3-way valve in the
water circuit make sure that the domestic hot water circuit and the
floor heating circuit is fully separated.
▪ Valve – Change‑over time. When using a 2-way valve or a 3-way
valve in the water circuit, the maximum change-over time of the
valve must be 60seconds.
▪ Filter. It is strongly recommended to install an additional filter on
the heating water circuit. Especially to remove metallic particles
from foul heating piping, it is recommended to use a magnetic or
cyclone filter, which can remove small particles. Small particles
may damage the unit and will NOT be removed by the standard
filter of the heat pump system.
▪ Dirt separator – Old heating installations. In case of old heating
installations, it is recommended to use a dirt separator. Dirt or
sediment from the heating installation can damage the unit and
reduce its lifetime. The domestic hot water circuit can also be
protected by a filter to prevent failure during domestic hot water
operation.
▪ Domestic hot water tank – Capacity. To avoid stagnation of
water, it is important that the storage capacity of the domestic hot
water tank meets the daily consumption of domestic hot water.
▪ Domestic hot water tank – After installation. Immediately after
installation, the domestic hot water tank must be flushed with fresh
water. This procedure must be repeated at least once a day the
first 5 consecutive days after installation.
▪ Domestic hot water tank – Standstills. In cases where during
longer periods of time there is no consumption of hot water, the
equipment MUST be flushed with fresh water before usage.
▪ Domestic hot water tank – Disinfection. For the disinfection
function of the domestic hot water tank, see "Domestic hot water
control: advanced"on page66.

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