Daikin Altherma 3 R F Installer's Reference Manual page 78

8 | Piping installation
Installer reference guide
78
89°C
b
j k
a c d
e
a Outdoor unit
b Indoor unit
c Heat exchanger
d Backup heater
e Pump
f Stop valve
g Motorised 3-way valve
▪ Drainage – Low points. Provide drain taps at all low points of the system in order
to allow complete drainage of the water circuit.
▪ Drainage – 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 "8.6.4 To connect the water piping for domestic hot
4
water" [ 98].
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).
75°C
FCU1
g f h
FCU2
M
f
M
FHL1
FHL2
Item
i
i
FCU3
i
i
FHL3
h Motorised 2-way valve (field
supply)
i Collector
j Domestic hot water tank
k Heat exchanger coil
FCU1...3 Fan coil unit (optional) (field
supply)
FHL1...3 Floor heating loop (field supply)
T Room thermostat (optional)
(field supply)
Requirement
15 mm
15 mm
22 mm
Metal
≥300 mm
≥1:200
≤9 m
0.8 m
ERGA04~08EAV3(A) + EHVH04+08SU18+23EA6V
4P629090-1 – 2020.08
Daikin Altherma 3 R F