4 classic m - Installation & ServicingGENERALThe boiler flow and return pipes are supplied fitted to theboiler ready for top connectionNotes.a. For the heating loads in excess of 60, 000 Btu/hr boilers,28mm (1") flow and return pipes should be used to andfrom the boiler.b. This appliance is NOT suitable for use with a direct hotwater cylinder.1 BOILER WATER CONNECTIONS2 BOILER CLEARANCES all dimensions in mm (in.)The following minimum clearances must be maintained foroperation and servicing.Additional space will be required for installation, depending uponsite conditions.Side and Rear Fluea Provided that the flue hole is cut accurately, e.g. with a coredrill, the flue can be installed from inside the building where wallthicknesses do not exceed 600mm (24"). Where the space intowhich the boiler is going to be installed is less than the length offlue required the flue must be fitted from the outside.Installation from inside ONLYb. If a core boring tool is to be used insidethe building the space in which the boileris to be installed must be at least wideenough to accommodate the tool.Ecl 1573ReturnFlowEcl 15745 (1/4")100 (4")400 (15 3/4")5 (1/4")165(6 1/2")Ecl 157550 (2")50 (2")390 (15 3/8")JackingscrewFlueterminal582(23")50 (2")278 (11")GasGas30 mm(1 1/8 ") 111mm(4 3/8 ")50 (2")50(2")Front clearanceThe minimum front clearance when built in to a cupboard is5mm (1/4") from the cupboard door but 450mm (17 3/4")overall clearance is still required, with the cupboard door open,to allow for servicing.* Bottom clearanceBottom clearance after installation can be reduced to 5mm.However, 100mm must be available for servicing.