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[ I have very recently had my old central heating system removed completely and replaced with a new installation of a Combi Condenser boiler with all new radiators and all pipes upgraded from 6mm to 15 mm. The hot water storage cylinder and replenishment tank have been disposed of...

Thanks for your time aptsys. A new search this morning has found the 7Ah batts for half the Maplins price @ Newey & Eyre local branch so I am well pleased and can now close this thread. Thanks to all.

electronicsuk, The Lift/Close activator has to be low voltage to comply with regs, in this case 24V. DC. Up/Down is determined by polarity via the respective external buttons. Heavy current is drawn to lift or close the metal store lid and attached front, so a simple stepdown transformer...

Thanks all. Aptsys, you're right! Maplins price: 2X 12V 7.2AH is £60 Electical wholesaler: 2X 12V 6.0 AH is £25 The Physical sizes are idendical. Hence my question. Just wondered if the 6.0AH batts would be good enough, saving £35. Lectrician...

Thanks, gblades. the 6.0 AH batts are the same physical dimensions as the old 7.2 AH batts. Just wondered if the liftarm actuator would draw too much current and cause premature batt failure but I doubt that. SLAs are quite robust and they will be used infrequently between charges. spark123...

For any sparks out there. I have an outside disability scooter store, the opening and closing of which is operated by a 24Volt lift arm running off SLA batteries (2x12v,7.2AH in series). After 12 years one of these batts is knackered so I will renew both. Locally, I can get the same sized...

Thanks, fellas. I have confirmed the dm5601 will directly replace the SATCH 3601 and will turn the valve shaft by hand until I get one, or fix the coupling with glue and a compression spring clip. By the way, the activator contains 3 windings and 3 micro switches, any of which could go...

Hi, everybody. My CH system uses a Satcwell Duoval 3601 Actuator which I have today disassembled and found the nylon coupling has split, so it will not rotate the valve shaft which is free to turn by hand. I know that the motor windings and the valve are O.K. and that renewing the coupling...