Daikin EGSQH10S18AA9W Installer's Reference Manual page 19

▪ 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 for brine circuit and space heating circuit. Using the
system in an open water system will lead to excessive corrosion.
WARNING
When connecting to an open groundwater system, an
intermediate heat exchanger is required to prevent
damage (dirt, freeze ups) to the unit.
▪ Glycol. For safety reasons, it is NOT allowed to add any kind of
glycol to the space heating 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 piping diameter in relation to the
required flow and the available external static pressure of the
pump. See "14 Technical data" on page 66
pressure curves of the indoor unit.
▪ Fluid flow. You can find the minimum required water for the
indoor unit operation in the following table. When the flow is lower,
flow error 7H will be displayed and the indoor unit will be stopped.
Model Minimum flow during backup heater
10 ▪ Space heating circuit: 12 l/min
▪ Brine circuit: 25 l/min
▪ Field supply components – Fluid. Only use materials that are
compatible with fluid used in the system and with the materials
used in the indoor unit.
▪ Field supply components – Fluid pressure and temperature.
Check that all components in the field piping can withstand the
fluid pressure and fluid temperature.
▪ Fluid pressure – Space heating and brine circuit. The
maximum fluid pressure of the space heating and brine circuit is
4 bar. Provide adequate safeguards in the water circuit to ensure
that the maximum pressure is NOT exceeded.
▪ Fluid pressure – Domestic hot water tank. The maximum fluid
pressure of the domestic hot water tank is 10 bar. Provide
adequate safeguards in the water circuit to ensure that the
maximum pressure is NOT exceeded.
▪ Fluid 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.
EGSQH10S18AA9W
Daikin Altherma ground source heat pump
4P351748-1D – 2016.02
for the external static
operation
withstand the following
65°C
a
i j
f
M
c
b b d
a Indoor unit
b Heat exchanger
c Backup heater
d Pump
e Stop valve
f Motorised 3-way valve
g Motorised 2-way valve (field supply)
h Collector
i Domestic hot water tank
j Heat exchanger coil
FCU1...3 Fan coil unit (optional)
FHL1...3 Floor heating loop
▪ Drainage – Low points. Provide drain taps at all low points of the
system in order to allow complete drainage of the circuit.
▪ Drainage – Pressure relief valve. Provide a proper drain for the
pressure relief valve to avoid fluid dripping out of the unit. See
"7.5.5 To connect the pressure relief valve to the drain" on
page 27.
WARNING
▪ All pipe work connected to the brine pressure relief
valve MUST have a continuous fall.
▪ The discharge pipe from the brine pressure relief valve
MUST terminate in a safe, visible position without
forming any risk to persons in the vicinity.
▪ Air vents. Provide air vents at all high points of the system, which
must also be easily accessible for servicing. At the space heating
side, 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 fluid circuit.
Because the unit's internal circuit uses copper piping, excessive
corrosion may occur. Zn coated parts used in the brine circuit may
lead to the precipitation of certain components in the anti-freeze
fluids corrosion inhibitor.
6 Preparation
70°C
h
h
FCU1
g
FCU2
e
FCU3
h
M
h
e
FHL1
FHL2
FHL3
Installer reference guide
19