Daikin EWYA004D2V3P Installer's Reference Manual page 60

8 | Piping installation
Installer reference guide
60
▪ Piping diameter. Select the water piping diameter in relation to the required
water flow and the available external static pressure of the pump.
For the external static pressure curves of the outdoor unit, see the technical
data. A subset of the latest technical data is available on the regional Daikin
website (publicly accessible). The full set of latest technical data is available on
the Daikin Business Portal (authentication required).
▪ Water flow. You can find the minimum required water flow for unit operation in
the following table. In all cases, this flow needs to be guaranteed. When the flow
is lower, the unit will stop operation and display error 7H.
If operation is...
Cooling
Heating
BUH operation
Heating defrost
▪ Field supply components – Water and glycol. Only use materials that are
compatible with the water (and, if applicable, glycol) used in the system, and
with the materials used in the outdoor 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 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 withstand the following temperatures:
INFORMATION
The following figure is an example and may NOT completely match your system
layout
65°C (*)
(*) Maximum temperature for piping and accessories
▪ Drainage – Low points. Provide drain taps at all low points of the system in order
to allow complete drainage of the water circuit.
Then the minimum required flow rate
is...
10 l/min
6 l/min
12 l/min
12 l/min
M
EWAA004~008D + EWYA004~008D
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688013-1B – 2022.09