HAMWORTHY HEATING LTD
40
Wessex ModuMax
mk3
Boilers
500001308/C
*
Note:
-
Flue gas volumes are corrected to a flue gas temperature of 15°C, @ 9.1% CO
2
and barometric pressure
of 1013.25mbar.
FLUE DATA
-
Natural Gas
97
116
147
Model
-
Condensing
97
196
291c
116
232c
348c
147
291c
441c
Nominal Flue Diameter
-
mm
100
180
180
100
180
180
150
250
250
Maximum Flue Gas Temperature
-
°C
83
83
78
Pressure at the boiler flue outlet
-
Pa/mbar
150 / 1.5
150/1.5
150/1.5
Approx. Flue Gas Volume
m
3
/h*
143
286
429
160
320
480
214
428
642
196
254
Model
-
Condensing
196
392c
588c
254
508c
762c
Nominal Flue Diameter
-
mm
150
250
250
150
250
250
Maximum Flue Gas Temperature
-
°C
83
82
Pressure at the boiler flue outlet
-
Pa/mbar
150/1.5
150 / 1.5
Approx. Flue Gas Volume
m
3
/h*
279
558
837
354
708
1062
APPENDIX C
-
FLUE DATA
Natural Gas & LPG
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 TER-
MINAL LOCATION AND ADJACENT BUILDING FABRIC.
C1.1 General Requirements
The Hamworthy Wessex ModuMax
series of boilers are designed to be used with natural draught flues. 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
Type B23p: Flue pressurised, 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 (97 & 116) & 150mm flue duct (147/196/254), for connection to
an open flue (chimney) system . 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 minimum slope of 3° 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. Conversely a flue system designed with a smaller diameter than the
boiler flue outlet may provide satisfactory performance. Consideration must be given to the correct calculation of
the required flue size. If in any doubt consult Hamworthy Heating Ltd who working in partnership with Midtherm
Engineering Ltd can provide a comprehensive flue design and installation package.
