Daikin Altherma F - Page 85

8 | Piping installation
Installer reference guide
85
EPRA14~18DAV3+W1 + ETVH16SU18+23EA6V
Daikin Altherma 3 H HT F
4P644738-1 – 2021.02
▪ 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 "8.2.4 To connect the water piping for domestic hot
water"[493].
Item Requirement
Pressure relief valve diameter 15mm
Discharge pipe diameter (to pressure relief valve) 15mm
Discharge piping diameter (from tundish) 22mm
Discharge piping material (from tundish) Metal
Vertical length below tundish, before first elbow or bend ≥300mm
Continuous fall after first elbow or bend ≥1:200
Maximum resistance
(a)
≤9m
Resistance created by each elbow or bend 0.8m
(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 "7.4.4To connect the drain hose to the
drain"[481].
▪ 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.
▪ Zn-coated parts. NEVER use zinc coated parts in the water circuit. Because the
internal water circuit of the unit uses copper piping, excessive corrosion may
occur.
▪ Non-brass metallic piping. When using non-brass metallic piping, insulate the
brass and non-brass properly so that they do NOT make contact with each other.
This to prevent galvanic corrosion.
▪ Valve – Change‑over time. When using a 2-way valve or a 3-way valve in the
water circuit, the maximum change-over time of the valve must be 60seconds.
▪ Domestic hot water tank – Capacity. To avoid stagnation of water, it is
important that the storage capacity of the domestic hot water tank meets the
daily consumption of domestic hot water.
▪ Domestic hot water tank – After installation. Immediately after installation, the
domestic hot water tank must be flushed with fresh water. This procedure must
be repeated at least once a day the first 5 consecutive days after installation.
▪ Domestic hot water tank – Standstills. In cases where during longer periods of
time there is no consumption of hot water, the equipment MUST be flushed with
fresh water before usage.