Daikin EWAA004D2V3P, Руководство по установке, Страница: 12 / 44

5 Piping installation
Installation manual
12
EWAA004~008D2 + EWYA004~008D2
Packaged air-cooled water chillers
and packaged air to water heat pumps
4P688014-1A – 2022.05
2
2
2
5×
1
3.55 N.m
a
a Speed nut
5 Piping installation
5.1 Preparing water piping
NOTICE
In case of plastic pipes, make sure they are fully oxygen
diffusion tight according to DIN 4726. The diffusion of
oxygen into the piping can lead to excessive corrosion.
NOTICE
Water circuit requirements. Make sure to comply with the
water pressure and water temperature requirements
below. For additional water circuit requirements, see the
installer reference guide.
▪ 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 (*)
M
EXAMPLE
(*) Maximum temperature for piping and accessories
5.1.1 To check the water volume and flow rate
Minimum water volume
Check that the total water volume in the installation is higher than
the minimum water volume, the internal water volume of the outdoor
unit NOT included:
If… Then the minimum water
volume is…
Cooling operation 15 l
Heating/defrost operation and the
external backup heater kit is…
Connected 15 l
NOT connected and…
The return flow temperature is
>15°C 20 l
The return flow temperature is
≤15°C 50 l
NOTICE
Never use less water than the minimum water volume. It
may cause the unit to malfunction.
NOTICE
When circulation in each space heating/cooling loop is
controlled by remotely controlled valves, it is important that
the minimum water volume is guaranteed, even if all of the
valves are closed or the overpressure bypass valve is
installed in front of the space heating/cooling loop.
Minimum flow rate
Check that the minimum flow rate (required during defrost/backup
heater operation (if applicable)) in the installation is guaranteed in all
conditions.
If operation is… Then the minimum required
flow rate is…
Cooling 10 l/min
Heating 6 l/min
BUH operation 12 l/min
Heating defrost 12 l/min
NOTICE
If glycol was added to the water circuit, and the
temperature of the water circuit is low, the flow rate will
NOT be displayed on the user interface. In this case, the
minimum flow rate can be checked by way of the pump
test.
NOTICE
When circulation in each or certain space heating loops is
controlled by remotely controlled valves, it is important that
the minimum flow rate is guaranteed, even if all valves are
closed. In case the minimum flow rate cannot be reached,
a flow error 7H will be generated (no heating or operation).
See the installer reference guide for more information.
See the recommended procedure as described in "9.2 Checklist
during commissioning" [ 4 35].