Connecting The Water Piping Of The Gas Boiler - Daikin CHYHBH05AA Installer's Reference Manual

7 Installation
b Water outlet
3 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.
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.
7.9.4 Connecting the water piping of the gas
boiler
To connect the water piping for space heating
Use the straight brass fitting connections (accessory of the heat
pump unit).
1 The space heating piping of the boiler will be connected to the
indoor unit.
2 Install the straight brass fitting connections so that they
perfectly match the connection of both modules.
3 Tighten the straight brass fitting connections.
Installer reference guide
32
a b
a Outlet space heating
b Inlet space heating
NOTICE
Make sure that the straight brass fitting connections are
tightened thoroughly to prevent leakage. Maximum torque
is 30 N∙m.
To connect the water piping for domestic hot
water (not applicable for Switzerland)
1 Flush the installation thoroughly to clean.
a b
a Domestic hot water outlet
b Cold water inlet
c Pressure relief valve (field supply)
2 Install a pressure relief valve according to local and national
regulations (if required).
3 Connect the hot water connection (Ø15 mm).
4 Connect the main cold water connection (Ø15 mm).
DANGER: RISK OF BURNING
In case of high leaving water set points for space heating
(either a high fixed set point or a high weather-dependent
set point at low ambient temperatures), the heat exchanger
of the boiler can be heated up to temperatures higher than
60°C.
In case of a tapping demand, it is possible that a small
volume of water tapping (<0.3 l) has a temperature higher
than 60°C.
Daikin hybrid for multi heat pump – heat pump module
c
CHYHBH05+08AA + EHYKOMB33A
4P471761-1A – 2017.10