Connection Of Heating System; Pressure Relief Valve And Overflow; Fitting The Appliance - Vaillant VCW 2O Instructions For Installation And Servicing

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{33 Gonnection of heating system
Fledirtg syslem flow and return should be in
2. rrtn copper pipe and connected to the
cqrtecting group as shown in fig. 9.
Ftl lhe heating system and test for soundness.
4.3.4 Pressure relief valve and overflow
The pressure relief valve, required for a sealed
system, is included into the connecting group.
- Screw in the overflow (4) below the
pressure relief valve into the drain line.
(To be availableas an optional extra.)
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4.4 Fitting the appliance
Close service cocks (5), unscrew union nuts (6)
and take off the olive-shaped plastic plugS.
Refit union nuts (6) with brass'compr6ssi-on
rings (7). Close mains water service cock (8)
and unscrew the union nutF (9).
*-A-6