Nuos Expansion; Ischarge - Ariston NUOS FS 200 Instructions For Installation And Servicing

Worked Example
The example below is for a G½ 6 with a discharge pipe
(D2) having 4 No. 22mm elbows and length of 7m from
the tundish to the point of discharge.
From Table 1:
Maximum resistance allowed for a straight length of
22mm copper discharge pipe (D2) from a G½
temperature relief valve is: 9.0m
Subtract the resistance for 4 No. 22mm elbows at 0.8m
each = 3.2m
Therefore the maximum permitted length equates to:
5.8m which is less than the actual length of 7m therefore
calculate the next largest size.
Maximum resistance allowed for a straight length of
28mm copper discharge pipe (D2) from a G½
temperature relief valve is: 18m
Subtract the resistance for 4 No. 28mm elbows at 1.0m
each = 4m
Therefore the maximum permitted length equates to:
14m
As the actual length is 7m, a 28mm (D2) copper pipe
will be satisfactory.
6.16 NUOS E
XPANSION
F . 6.16 T E
IG A YPICAL
D

ISCHARGE

Condensate Drain
Connect to appliance using
½” elbow spigot supplied.
Tundish
D A
XPANSION ISCHARGE RRANGEMENT
3.58Where a single common discharge pipe serves
more than one system, it should be at least one pipe
size larger than the largest individual discharge pipe (D2)
to be connected.
3.59The discharge pipe should not be connected to a
soil discharge stack unless it can be demonstrated that
the soil discharge stack is capable of safely withstanding
temperatures of the water discharged, in which case, it
should:
a. contain a mechanical seal, not incorporating a water
trap, which allows water into the branch pipe without
allowing foul air from the drain to be ventilated
through the tundish;
b. be a separate branch pipe with no sanitary
appliances connected to it;
c. if plastic pipes are used as branch pipes carrying
discharge from a safety device they should be either
polybutalene (PB) to Class S of BS 7291-2:2006 or
cross linked polyethylene (PE-X) to Class S of BS
7291-3:2006; and
d. be continuously marked with a warning that no
sanitary appliances should be connected to the
pipe.
NUOS Temperature and
Pressure Relief Valve (TPRV)
15mm
15mm
Pressure Relief
Valve (PRV)
Hot
Supply
to Taps
Feed
Expansion
Vessel
Balanced
Cold Supply
to Taps
Cold
Not to scale
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