Hamworthy Weymouth Advanced, Installation, Commissioning And Servicing Instructions

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HAMWORTHY HEATING LTD
14
WEYMOUTH 500001112/C
10.0 SERVICING AND REPLACEMENT OF COMPONENTS
Note!
When servicing or replacing Weymouth components electrically isolate the unit and close the system and
expansion vessel isolating valves. The Advanced unit should also be isolated from the pressure alarm circuits.
When remaking screwed connections use a thread sealant .
The cover on the Standard unit is secured by one screw at the lower edge of the front panel and one screw on the
top panel. The cover on the Advanced unit is secured by one screw at the lower edge of the front panel only.
10.1 Hamworthy Heating Recommended Spares
Standard Spares Advanced Spares
Part
Part N° Part Part N°
Pump
Assembly 530905046 Pump Assembly 530905045
Float Valve Assembly 531911037 Float Valve Assembly 531911038
Pressure Gauge 557002009 Pressure Gauge 557002009
Pressure Switch Assembly 533925005 Pressure Switch Assembly 533925005
Non-return valve cartridge 531911039 Non-return valve cartridge 531911040
NOTE! For any service/replacement parts the unit serial No. (on the Data Plate inside the unit) MUST be
quoted.
For service or spares contacts please refer to the inside front cover of this guide.
10.2 Standard Pump Removal
Figure 19 Pump Fittings
Hamworthy part n° 530905046
Pump Removal Sequence
1) Isolate the water supply from the unit.
2) Empty the unit’s header tank.
3) Once clear of water undo the bulkhead fitting (fig 19,1),
4) Undo the down pipe fitting (fig 19,2)
5) Unscrew the 2 pump assembly mounting screws (fig 19,3).
6) Once the pump assembly has been removed from the
unit the pump can easily be removed from the assembly.
The wiring terminals are inside the box on the top on the pump. The wiring layout can be found on the wiring
diagram in the appendix and on Figure 20 below.
Figure 20 Standard Pump Wiring Terminals