HAMWORTHY HEATING LTD
44
WESSEX MODU
MAX
100 SERIES
500001123/C
APPENDIX C - FLUE DATA
FLUE DATA
Model
110/110
110/220
110/330
Nominal Flue Diameter
-
mm
100
180
180
Approx. Flue Gas Temperature
- °C (Gross)
125
Approx. Flue Gas Volume @ 9% CO
2
- m
3
/h*
155
310
465
Model
120/120c 120/240c 120/360c
Approx. Flue Gas Temperature @ 80/60°C - °C (Gross)
Approx. Flue Gas Volume @ 9% CO
2
- m
3
/h*
165
330
495
70
Pressure at the boiler flue outlet - Pa/mbar
150 / 1.5
Pressure at the boiler flue outlet - Pa/mbar
150 / 1.5
Natural Gas
C1.0 FLUE SYSTEM
1. Detailed recommendations for flue systems are given in BS 6644, and 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 MODUMAX BOILER WILL GENERATE A
PLUME AT THE TERMINAL EXIT. THIS MUST BE CONSIDERED WITH REGARD TO
TERMINAL LOCATION AND ADJACENT BUILDING FABRIC.
C1.1 General Requirements
The Hamworthy Wessex Modu
Max
series of boilers are designed to be used with natural draught flues or a room
sealed twin duct system supplied by Hamworthy Heating for single boiler installations only. Flue systems should
be designed in accordance with regulations and with reference to BS 6644 and IGE/UP/10.
Open (Natural draught ) Flue.
Type B23: Intake from ventilated plant room and discharge via horizontal/vertical flue. – Fig C1.1.2
The connection to the boiler is suitable for 100mm flue duct, for connection to an open flue (chimney) system – maximum
length 10m. The resistance of the flue system components is detailed in Figure C1.1.1
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 and be at least
15mm diameter. It must also have a fall of at least 2-3° (approx. 30-50mm per meter) and connect to a drain via a
waste trap.
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 and installation service.
The following points should be noted:
Room Sealed Flue: Refer to Figures C1.1.2 & C1.1.3 for details. The system is not intended as a balanced flue
and air inlet and flue terminals must be separated by at least 700mm.
*
Note:-
Flue gas volumes are corrected to a flue gas temperature of 15°C and barometric pressure of
1013.25mbar.
