27
INSTALLER
INSTALLER
3.9
Discharge of combustion products
The flue gas exhaust and stack connection must be made in compliance with applicable laws and standards, using heat resistant,
condensate resistant and stress resistant rigid pipe and sealed joints.
The stack must be fitted with a condensate trap and drain and the flue gas exhaust pipe must be installed at a slope of at least 3°
towards the boiler.
DIMENSIONS (mm)
TAU N
115
150
210
270
350
450
600
800
1000
1150
1250
1450
H - Height of flue gas outlet
515
515
515
545
545
645
645
680
680
720
720
805
mm
Ø i Diameter of flue gas fitting
160
200
200
250
250
300
300
350
350
400
400
450
mm
H
ø i
RIELLO TAU N
9
The stack must guarantee the minimum draught specified by applicable technical standards, assuming zero pressure at the
connection to the flue gas exhaust.
9
Inadequate or badly dimensioned stacks and flues can increase combustion noise and affect combustion parameters
9
Joints must be sealed using suitable materials (e.g. filler, mastic or silicon based sealant).
9
Uninsulated flues are potentially dangerous and can cause burns.
9
If plastic flue gas outlet ducts are used, install an O-ring safety thermostat set to 90°C. Install the thermostat on the flue gas
outlet, with the distance from the boiler body outlet equal to the diameter of the flue gas outlet itself.
3.10
Installation in B23P configuration
The B23P configuration may only be adopted with premix gas burners. The table below specifies maximum permissible flue
back-pressure. Make sure that flue pipes are of a suitable class for the values specified in the table.
BOILER model
PREMIXED BURNER model
Flue exhaust tube maximum
pressure (*) (Pa)
Boiler noise (**) (db(A))
TAU 115 N
RX150S/PV
150
68
TAU 150 N-NC
RX180S/PV
150
68
TAU 210 N-NC
RX250S/PV
150
68
TAU 270 N-NC
RX360S/PV
150
69
TAU 350 N-NC
RX500S/PV
180
67
TAU 450 N-NC
RX500S/PV
180 (***)
74 (***)
TAU 450 N-NC
RX700S/PV
150
74
TAU 600 N-NC
RX850S/PV
180
74
TAU 800 N
RX1000S/PV
200
76
TAU 1000 N
RX1000S/PV
200
76
(*)
With B23P exhaust configuration (only with RX Series premix burners).
(**)
Noise level measured as continuous sound pressure weighted according to scale A, at 1 metre from the appliance.
(***)
The values indicated are valid only in working conditions with CO2
≥
9.2 % and at less than 300 metres above sea level.