Daikin Altherma 3 H HT F Installer's Reference Manual page 86

8 | Piping installation
Installer reference guide
86
75°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.
▪ Drainage – DHW pressure relief valves. Provide a proper drain for the pressure
relief valves (of both the domestic hot water tank and the domestic hot water
tank kit) to avoid water spillage around the unit. For the discharge piping
connected to these valves, respect the requirements from the table below. For
more information, see
4
water" [ 95].
Pressure relief valve diameter
Discharge pipe diameter (to pressure relief valve)
Discharge piping diameter (from tundish)
Discharge piping material (from tundish)
Vertical length below tundish, before first elbow or bend
Continuous fall after first elbow or bend
(a)
Maximum resistance
Resistance created by each elbow or bend
(a)
The maximum allowed resistance (i.e. equivalent length) is expressed as a length of
straight pipe (i.e. no elbows or bends).
NOTICE
All piping MUST be installed according to section G3 of the Building Regulations.
▪ Drainage – Pressure relief valve. Connect the drain hose properly to the drain to
avoid water dripping out of the unit. See
4
drain" [ 82].
▪ Air vents. Provide air vents at all high points of the system, which must also be
easily accessible for servicing. Two automatic air purges are provided in the
indoor unit. Check that the air purges are NOT tightened too much, so that
automatic release of air in the water circuit is possible.
M
"8.2.4 To connect the water piping for domestic hot
Item
"7.4.4 To connect the drain hose to the
89°C (*)
75°C (*)
Requirement
15 mm
15 mm
22 mm
Metal
≥300 mm
≥1:200
≤9 m
0.8 m
EPRA14~18D + ETVH16SU18+23E
Daikin Altherma 3 H HT F
4P644738-1A – 2022.03