Preparing Water Piping; Water Circuit Requirements - Daikin Altherma ERLQ004-006-008CA Reference Manual

6 Preparation
Pipe outer diameter Insulation inner
(Ø ) diameter (Ø
p
6.4 mm (1/4") 8~10 mm
15.9 mm (5/8") 16~20 mm
Ø Ø
i i
Ø Ø
p p
t
If the temperature is higher than 30°C and the humidity is higher
than RH 80%, the thickness of the insulation materials should be at
least 20 mm to prevent condensation on the surface of the
insulation.
6.4

Preparing water piping

6.4.1

Water circuit requirements

INFORMATION
Also read the precautions and requirements in the
"General safety precautions" chapter.
▪ Connecting piping – Legislation. Make all piping connections in
accordance with the applicable legislation and the instructions in
the "Installation" chapter, respecting the water inlet and outlet.
▪ Connecting piping – Force. Do NOT use excessive force when
connecting the piping. Deformation of the piping can cause
malfunctioning of the unit.
▪ Connecting piping – Tools. Only use appropriate tooling to
handle brass, which is a soft material. If NOT, pipes will get
damaged.
▪ Connecting piping – Air, moisture, dust. If air, moisture or dust
gets into the circuit, problems may occur. To prevent this:
▪ Only use clean pipes
▪ Hold the pipe end downwards when removing burrs.
▪ Cover the pipe end when inserting it through a wall, to prevent
dust and/or particles entering the pipe.
▪ Use a decent thread sealant to seal connections.
▪ Closed circuit. Use the indoor unit ONLY in a closed water
system. Using the system in an open water system will lead to
excessive corrosion.
▪ Glycol. For safety reasons, it is NOT allowed to add any kind of
glycol to the water circuit.
▪ 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 "14 Technical data" on page 71
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 during defrost/backup heater
operation
04+08 models
16 model
▪ 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.
Installer reference guide
18
Insulation thickness
) (t)
i
10 mm
13 mm
for the external
12 l/min
15 l/min
▪ 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 4 bar. Provide
adequate safeguards in the water circuit to ensure that the
maximum pressure is NOT exceeded.
▪ Water temperature. All installed piping and piping accessories
(valve, connections,...) MUST
temperatures:
INFORMATION
The following illustration is an example and might NOT
match your system layout.
60°C
55°C
k
f i
M
M
a b c d e h g i
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Motorised 3‑way valve (switch between space heating and
domestic hot water)
f Motorised 3‑way valve (mixing the main zone)
g Main pump
h Additional pump
i Shut-off valve
j Collector (field supply)
k Domestic hot water tank
HPC1...3 Heat pump convector (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 valve. Provide a proper drain for the
pressure relief valve to avoid water dripping out of the unit. See
"7.8.5 To connect the pressure relief valve to the drain" on
page 32.
▪ 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 – 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.
withstand the following
j
HPC1 HPC2 HPC3
i
j
i
FHL1 FHL2 FHL3
ERLQ004~008CA + EHVZ04+08S18CB
Daikin Altherma – Low temperature split
4P401676-1 – 2015.02