Hot Water Cylinder Connections; Cold Water Supply; Connecting Pump - Watermill PC25DLV Installation Instructions Manual

The negative head kit provides for a pneumatic push button and air switch. This enables the
pump to be started by pressing a push button located in the shower area.
DO NOT USE ANY JOINTING COMPOUNDS.
The use of a Surrey Flange; see Fig. 1 is recommended to ensure a free flowing supply of "air
free" hot water. Ensure that:
• The controlled hot water temperature is no greater than 60°C.
• Maximise size of pipework to the pump.
Note: All plumbing work should conform to Water Supply (Water Fittings) Regulations
1999.
The hot water feed may be taken directly from the top of the hot water cylinder – but
entrapped air may cause problems.
22mm copper pipe must be used to ensure an adequate flow to the pump. An isolating
gate valve or full bore lever valve is recommended to facilitate pump servicing.
DO NOT CONNECT DIRECTLY TO WATER MAINS
DO NOT USE ANY JOINTING COMPOUNDS
The cold water supply to the pump should be connected only from the cold water cistern (do
not connect to the central heating header tank!) see Fig. 1. The tank connector should be
positioned at least 25mm (1") lower than the cold water feed to the hot water cylinder; see
Fig. 1.
An isolating gate valve is recommended to facilitate pump servicing, also 22mm copper
pipe is recommended for connection on the cold water inlet.
DO NOT USE ANY JOINTING COMPOUNDS OR TAPES
Watermill pumps are supplied complete with matching flexible hoses. These hoses must be
used to ensure strain and vibration free, watertight connections.
NOTE: Do not connect metal (Brass/Iron) fittings directly onto pump inlets/outlets. The
threads are 3/4" BSP parallel and are designed for mating only with the flexible hose
connections, nuts and filters/washers supplied. DO NOT USE PTFE TAPE.
For ease of future servicing/filter cleaning, 22mm gate valves are recommended.
The filters supplied should be inserted in the pump inlets only – with the wire dome
towards the pump.
Position pump level on floor, with outlets (flowswitches) vertical. For correct operation
the flowswitches must be vertical.
Position supply pipes and shower hoses accurately so that the pump is not under any
mechanical strain, such as supporting weight of
pipes. Ensure correct alignment to prevent cross
threading and to prevent seals and filters from
leaking.
Line up pipework and fit hoses to pipes
before attaching connectors to pump.
Do not bend hoses as this will cause
restriction of flow.
The plastic nuts should be finger tight plus
1/2 turn. The nuts should be re-tightened after
hot water has been pumped for the first time.
Ensure filters are fitted to the inlets and
washers to outlets.

4. HOT WATER CYLINDER CONNECTIONS

5. COLD WATER SUPPLY

6. CONNECTING PUMP

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