Hamworthy Sherborne Series Installation, Commissioning And Servicing Instructions page 40

APPENDIX C - FLUE DATA
Natural Gas
FLUE DATA
Model
Nominal Flue Diameter
Approx. Flue Gas Temperature (non condensing)-
Approx. Flue Gas Temperature (condensing) -
Pressure at the boiler flue outlet
Approx. Flue Gas Volume @ 9% CO
NOx corrected (daf mg/kWh [ppm])
* Note:- Flue gas volumes are corrected to a flue gas temperature of 15°C & barometric pressure of
1013.25mbar.
C1.0 FLUE SYSTEM
Detailed recommendations for flue systems are given in BS 6644, & IGE/UP/10. All flue discharges for plant
exceeding 150kW output must comply with the third edition of the 1956 Clean Air Act Memorandum.
WARNING: THE FLUE DISCHARGE FROM A SHERBORNE BOILER WILL GENERATE A
PLUME AT THE TERMINAL EXIT. THIS MUST BE CONSIDERED WITH REGARD TO
TERMINAL LOCATION & ADJACENT BUILDING FABRIC.
C1.1 General Requirements
The Hamworthy Sherborne series of boilers are designed to be used with natural draught flues or a room sealed
system supplied by Hamworthy Heating. Flue systems should be designed in accordance with regulations & with
reference to BS 6644 & IGE/UP/10.
Room Sealed - type C13 (see figure C1): Horizontal balanced flue in 80/125mm concentric (for rear through the
wall discharge) or in 100/150mm concentric for remote discharge.
Room Sealed - type C33 (see figure C2): Vertical balanced flue.
Room sealed - type C53 (see figure C3): Separate intake & discharge ducts terminating in different pressure
zones.
Note: the intake & discharge terminals must be separated by a minimum distance of 700mm.
Open flue - type B23 (see figure C4): Air intake from ventilated plant room & discharged via horizontal/vertical
flue .
The following points should be noted:
a. Due to the high thermal efficiency of the boiler condensation in the flue will occur. It is strongly recommended
that twin wall or insulated flue pipe is used on all installations.
b. Care should be taken to ensure that the flue is installed such that any condensation is continuously drained. All
flues should have a maximum slope of 2° upwards in the direction of the exhaust gas flow (no horizontal
sections). All joints should be such that any condensation is directed back down the slope to an open drain
connection in the flue. The drain pipe must be manufactured from a corrosion resistant material & be at least
22mm diameter. It must also have a fall of at least 2-3° (approx. 30-50mm per meter) & connect to a drain via a
waste trap.
Important - In fitting the HHL supplied 100mm dia. ducts to a stainless steel flue system,
the flue system must have it's own condense drain. The system must not be allowed to
drain back through the HHL supplied components.
c. Boiler flue outlet sizes - A flue system designed with the same diameter as the boiler flue outlet may not provide
satisfactory performance in all applications. Consideration must be given to the correct calculation of the required
flue size. If in any doubt consult Hamworthy Heating Ltd who can supply a full flue design & installation service.
HAMWORTHY HEATING LTD
- mm
°C
°C
- Pa/mbar
3
- m /h*
2
38
SHERBORNE
Sherborne Sherborne
SE64he
Single pipe 100, concentric 80/125
or concentric 100/150
140
-
100/1.0
114
44 [25]
SE71c
65
55
90
500001167/E