Connect The Water Supply; Connect The Power Supply Cable - Potterton Promax HE Store 90 Litres Installation & Servicing Instructions Manual

Graph of Central Heating Head vs. Flow
m
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Secondary Circulation
A pumped secondary circuit, if required, can be
connected by teeing into the 22 mm DHW Outlet pipe
and the 22 mm Cold Inlet pipe. Note: This is not
recommended for models having a secondary store of
less than 150 litres.
A single check valve (spring loaded type) should be fitted
in the return from the secondary circuit. All component
parts of a secondary circuit must be suitable for
operation at temperatures up to 65
to 8 bar.
From secondary circuit
Fig. 12
22
3
Flow litres/min.
and pressures up
°C
To secondary circuit
RWC
Check Valve
2.5 Connect the Water System
Read and observe recommendations in Section
1.6 and see Fig. 11.
Secure the combination reducing valve - a wall
bracket is provided in the accessory pack. 22mm
copper tube is recommended for both the inlet and
outlet connections. A 22mm balanced pressure
outlet is built-in to this valve for supplying showers
etc. It can be sited away from the boiler e.g. where
the water mains enters the dwelling, to assist with
providing reduced pressure to all the system.
Position the cross fitting c/w with expansion relief
valve downstream of the reducing valve-see Fig.
11. Ensure the flow direction is correct - arrows
indicate the direction of flow. Connect the tundish
MAX0063A
within 50cm of the relief valve. NB The valve can
be rotated to give the best pipe run to the tundish.
Select a location for the expansion vessel within
reach of the 1m flexible connector and fix the
expansion vessel using the bracket provided.
Avoid sharp bends or "kinks" in the flexible
connector and ensure there is service access to
the checking/charging point.
Future servicing operations will be simplified if the
cross fitting/relief valve and the expansion vessel
can be sited above the DHW store as indicated in
Fig. 11.
CH System Connections
The flow connection is on the LH side of the unit.
The 22mm flow pipe supplied with the cylinder
provides clearance for future maintenance of the
immersion heater. Ensure this pipe is pushed fully
home into the "Techtite" joint. The return
connection is low down at the front centre.
Pressure Relief Valve (Primary)
A pressure relief valve set at 3.0 bar is fitted to the
Heat Engine's primary circuit. Trim the supplied
15mm branch pipe to length before fitting - See
Fig. 10.
2.6 Connect the Power Supply
WARNING – THIS BOILER MUST BE EARTHED
Wiring must comply with the current IEE Wiring
Regulations. The supply cable must be 3-core
0.75sq. mm (24/0.2 mm) to BS6500 Table 16.
The supply must be of 230V – 50Hz. A 3A-fused
double pole-isolating switch may be used, having
a minimum contact separation of 3 mm in both
poles, providing it serves only the boiler and its
system controls. Alternatively a 3A 3 pin fused plug
may be used.
© Baxi Heating UK Ltd 2006