Daikin Altherma EHVH08SU18CB6W Installer's Reference Manual page 26

6 Preparation
89°C
b
j l k
75°C
a c d g f
e f
M
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Pump
f Stop valve
g Motorised 3-way valve
h Motorised 2-way valve (field supply)
i Collector
j Domestic hot water tank
k Heat exchanger coil
l Booster heater
FCU1...3 Fan coil unit (optional) (field supply)
FHL1...3 Floor heating loop (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 valves. Provide a proper drain for the
pressure relief valves (of both the domestic hot water tank and the
domestic hot water tank kit) to avoid water dripping out of the unit.
For the discharge piping connected to these valves, respect the
requirements from the table below. For more information, see
"7.8.4 To connect the water piping" on page 39
connect the pressure relief valve to the drain" on
Item
Pressure relief valve diameter
Discharge pipe diameter (to pressure relief valve) 15 mm
Discharge piping diameter (from tundish)
Discharge piping material (from tundish)
Vertical length below tundish, before first elbow or
bend
Continuous fall after first elbow or bend
(a)
Maximum resistance
Resistance created by each elbow or bend
(a) The maximum allowed resistance (i.e. equivalent length) is
expressed as a length of straight pipe (i.e. no elbows or
bends).
INFORMATION
All piping MUST be installed according to section G3 of the
Building Regulations.
Installer reference guide
26
i
i
FCU1
h
FCU2
FCU3
i
M
i
FHL1
FHL2
FHL3
and "7.8.5 To
page 41.
Requirement
15 mm
22 mm
Metal
≥300 mm
≥1:200
≤9 m
0.8 m
▪ 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.
▪ 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
water control: advanced" on page 61.
▪ Domestic hot water tank kit – Clean pipes. Before installing the
domestic hot water tank kit, all piping and fittings must be flushed
free of flux and debris. Failure to do this may cause irreparable
damage to the tank kit control valves. Flush the system by
opening the hot water tap.
▪ Domestic hot water tank kit – Pressure balancing. To prevent
large pressure differences at the taps and damage to the shower
valve due to high‑pressure cold water (5 bar), provide a dedicated
2‑bar feed to both cold water and hot water taps. To do this, also
connect the cold water supply for the cold water taps to the
pressure reducing valve of the domestic hot water tank kit.
b
e
a Cold water supply into house at 5 bar
b To 5-bar taps
c Pressure reducing valve (part of the domestic hot water
tank kit)
d Indoor unit
e Dedicated 2‑bar feed
f Cold water taps
g Hot water taps
ERLQ004~008CA + EHVH04+08SU18+26CB6W
"8.3.2 Domestic hot
a
f f
e
c
d
g g
e
Daikin Altherma – Low temperature split
4P449978-1B – 2018.07
h