Potterton LPG 50e Installation And Servicing Manual page 12

INSTALLATION INSTRUCTIONS - Page 12
FIG. 11 a SIDE FLUE
1. Measure from outside face of wall to the side of boiler
casing reference line (dimension 'x').
2. Take air/flue duct assembly and measuring from the
flanged end, mark and cut the outer duct and inner flue
duct to dimension 'x' plus 20mm. Ensure that both
ducts are cut squarely.
FIG. 12 AIR/FLUE DUCT ASSEMBLY
NOTE: During assembly the seam in the air duct should be
so arranged that when installed, the seam in the duct will be
uppermost.
1. Slide rope sealing ring on to air duct.
2. Engage the terminal on to the ends of the inner flue
duct and press fully home.
FIG. 11 b REAR FLUE
1. Measure wall thickness (dimension 'Y').
2. Take air/flue duct assembly and measuring from the
flanged end, mark and cut the outer air duct and inner
flue duct to dimension 'Y', plus 45 mm. Ensure that both
ducts are cut squarely.
NOTE
Cutting length remains the same for minimum or
maximum clearance at the rear of the boiler
3. Engage four screws from accessory pack "C" into the
pre-drilled holes in the terminal and screw fully home.
These screws which are self drilling will pierce the air
duct and secure the terminal to air duct. On model 50e
it is necessary to drill four pilot holes in the air duct.