Connecting The Water Piping; About Connecting The Water Piping; Precautions When Connecting The Water Piping; To Connect The Water Piping - Daikin ERLQ004CA Installer's Reference Manual

7.8

Connecting the water piping

7.8.1

About connecting the water piping

Before connecting the water piping
Make sure the outdoor and indoor unit are mounted.
Typical workflow
Connecting the water piping typically consists of the following
stages:
1 Connecting the water piping to the indoor unit.
2 Filling the water circuit.
3 Filling the domestic hot water tank.
4 Insulating the water piping.
7.8.2 Precautions when connecting the water
piping
INFORMATION
Also read the precautions and requirements in the
following chapters:
▪ General safety precautions
▪ Preparation
7.8.3

To connect the water piping

NOTICE
Do NOT use excessive force when connecting the piping.
Deformation of the piping can cause malfunctioning of the
unit.
To facilitate service and maintenance, 2 shut-off valves are provided.
Mount the valves on the water inlet and on the water outlet. Mind
their position: the integrated drain valves will only drain the side of
the circuit on which they are located. To be able to only drain the
unit, make sure the drain valves are positioned between the shut‑off
valves and the unit.
1 Install the shut-off valves on the water pipes.
b a
a Water inlet
b Water outlet
NOTICE
To avoid damage to the surroundings in case of water
leakage, it is recommended to close the cold water inlet
shut‑off valves during periods of absence.
2 Screw the indoor unit nuts on the shut-off valves.
3 Connect the field piping on the shut-off valves.
4 In case of connection with the optional domestic hot water tank,
see the installation manual of the domestic hot water tank.
NOTICE
Install air purge valves at all local high points.
ERLQ004~008CA + EHBH/X04+08CB
Daikin Altherma – Low temperature split
4P384972-1B – 2017.04
NOTICE
▪ A drain device and pressure relief device should be
installed on the cold water inlet connection of the
domestic hot water cylinder.
▪ To avoid back siphonage, it is recommended to install a
non-return valve on the water inlet of the domestic hot
water tank in accordance with the applicable legislation.
▪ It is recommended to install a pressure reducing valve
on the cold water inlet in accordance with the
applicable legislation.
▪ An expansion vessel should be installed on the cold
water inlet in accordance with the applicable legislation.
▪ It is recommended to install the pressure relief valve on
a higher position than the top of the domestic hot water
tank. Heating of the domestic hot water tank causes
water to expand and without pressure relief valve the
water pressure inside the tank can rise above the tank
design pressure. Also the field installation (piping,
tapping points, etc.) connected to the tank is subjected
to this high pressure. To prevent this, a pressure
relieve valve needs to be installed. The overpressure
prevention depends on the correct operation of the field
installed pressure relief valve. If this is NOT working
correctly, overpressure will deform the tank and water
leakage may occur. To confirm good operation, regular
maintenance is required.
7.8.4

To fill the water circuit

1 Connect the water supply hose to the drain and fill valve.
2 Open the drain and fill valve.
3 Make sure that the automatic air purge valve is open (at least 2
turns).
4 Fill the circuit with water until the manometer indicates a
pressure of ±2.0 bar.
5 Purge as much air as possible from the water circuit. For
instructions, see "9 Commissioning" on
6 Close the drain and fill valve.
7 Disconnect the water supply hose from the drain and fill valve.
NOTICE
The water pressure indicated on the manometer will vary
depending on the water temperature (higher pressure at
higher water temperature).
However, at all times water pressure shall remain above
1 bar to avoid air entering the circuit.
7.8.5

To fill the domestic hot water tank

For installation instructions, see the installation manual of the
domestic hot water tank.
7 Installation
page 75.
Installer reference guide
39