Panasonic WH-TD20E3E5 Service Manual page 19

6.2.6 Termination of Discharge Pipe
Download discharge at low level, i.e. up to 100 mm above external surfaces such as car parks, hard standings,
grassed areas etc, are acceptable providing that where children may play or otherwise come into contact with
discharges, a wire cage or similar guard is positioned to prevent contact, whilst maintaining visibility.
Discharge at high level, i.e. into a metal hopper and metal down pipe with end of the discharge pipe clearly visible
(tundish visible or not) or onto a roof capable of withstanding high temperature discharges of water and 3 m from any
plastic guttering system that would collect such discharges (tundish visible). Where a single pipe serves a number of
discharges, such as in blocks of flats, the number served should be limited to not more than 6 systems so that any
installation discharging can be traced reasonably easily. The single common discharge pipe should be at least one
pipe size larger than the largest individual discharge pipe to be connected. For further information contact your
Building Control Office or The British Board of Agreement.
Safety device
(e.g. temperature
relief valve)
Table 1
Max. design
Product code
pressure
WH-TD20E3E5-UK 8bar
WH-TD30E3E5-UK 8bar
Table 2
Actual
Product code
capacity
WH-TD20E3E5-UK 198 l.
WH-TD30E3E5-UK 287 l.
Metal discharge pipe (D1)
relief valve to tundish
600 mm
maximum
300 mm
minimum
Discharge pipe (D2) from
tundish with continuous fall.
See 3.56, Table 1
and worked example
Operating pressure Pressure drop
CW feed & coil Primary heater
CW in 2bar, coil 2bar
CW in 2bar, coil 2bar
Heat-up (min) Rating (kW)
coil
21
32
from temperature
Tundish
Temp./pressure
Relief valve
0.09bar 90 - 95°C/10bar
0.11bar 90 - 95°C/10bar
Heat loss
coil kWh / 24h
26.9 1.9
22.8 2.3
19
Discharge below
fixed grating
(3.61 gives alternative
points of discharge)
Fixed grating
Trapped gulley
Safety valve Exp. Vessel
Pressure/conn. pre charge
8bar/15mm-1/2"
8bar/15mm-1/2"
Primary Hot Water
Flow rate Capacity
(15 l/min, - 80°C)
(15 l/min, - 80°C)
3.5bar
3.5bar
179 l.
237 l.