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- 28 Oct 2022
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Hi,
Just replaced my 20 year old 22mm Drayton 3 way valve, 679H340-30L0, for new MA1/679-3, to get my central heating system, working again.
On stripping down the old actuator, to gain access to the two micro switches, using a multimeter on resistance scale I found that both switches, were open circuit, then using 'switch cleaner & operating the push buttons, I found that both switches, worked again. On re-assembling the actuator again, I connected 3 of the 5 wires, to a 3 pin plug, the Yellow/Green EARTH, the Brown (power) & the Blue (Neutral), on switching on at the mains, i found that the indicator, would move from the W position (Hot Water) to the middle M position ( hot water & Central Heating. On switching off the power , the indicator, would return to the W position again.
Before installing the new valve, I removed the actuator & put a very small amount of Water Proof Silicone Grease (-30 deg C to +180 deg C ) on the operating shaft, for lubrication. While doing this, I discovered that my old actuator, would actually locate & fit on the new MA1/679-3) body, so the actuators are inter-changeable & can be easily attached using simply 2 large cable ties (re-movable type), I made up 2 steel U shaped clamps , which are adjustable, which make things a bit easier.
Wiring up the 5 wires, into the CH Control Box, is always time consuming, doing the recommended, one colour at a time method.
An alternative easier, long term solution is to purchase, two 5 way Plug & Socket connectors, which makes removing & replacing of the actuator, a 3/5 minute operation: . These can be purchased from:
From www.zoro.co.uk
5 Way Elec Connector Plug & Socket Set
Order Code (SKU): ZT1245752S
They were around £11 each, by buying two, you get free postage. You need one socket & two plugs, to do an exchange of actuators.
To, wire up, switch off power to the Control Panel, cut the existing 5 wire cable in half & then connect the control panel end to the new 5 way socket & then switch on power again. Exchange of units, is far easier & mor importantly quicker, as NO messing about, in the control panel.
Be careful, removing the motor from the pcb, via the 2.8mm spades, I have replaced mine, with a thicker spade 0.7mm, with a 0.85mm spade, to reduce them breaking off.
Hope all this improves your maintenance of these valves,
Al
Just replaced my 20 year old 22mm Drayton 3 way valve, 679H340-30L0, for new MA1/679-3, to get my central heating system, working again.
On stripping down the old actuator, to gain access to the two micro switches, using a multimeter on resistance scale I found that both switches, were open circuit, then using 'switch cleaner & operating the push buttons, I found that both switches, worked again. On re-assembling the actuator again, I connected 3 of the 5 wires, to a 3 pin plug, the Yellow/Green EARTH, the Brown (power) & the Blue (Neutral), on switching on at the mains, i found that the indicator, would move from the W position (Hot Water) to the middle M position ( hot water & Central Heating. On switching off the power , the indicator, would return to the W position again.
Before installing the new valve, I removed the actuator & put a very small amount of Water Proof Silicone Grease (-30 deg C to +180 deg C ) on the operating shaft, for lubrication. While doing this, I discovered that my old actuator, would actually locate & fit on the new MA1/679-3) body, so the actuators are inter-changeable & can be easily attached using simply 2 large cable ties (re-movable type), I made up 2 steel U shaped clamps , which are adjustable, which make things a bit easier.
Wiring up the 5 wires, into the CH Control Box, is always time consuming, doing the recommended, one colour at a time method.
An alternative easier, long term solution is to purchase, two 5 way Plug & Socket connectors, which makes removing & replacing of the actuator, a 3/5 minute operation: . These can be purchased from:
Description
5-way connector, 20A connector plug, 250V connector plug, arctic hayes, hayes uk, hayesuk, 556094From www.zoro.co.uk
5 Way Elec Connector Plug & Socket Set
Order Code (SKU): ZT1245752S
They were around £11 each, by buying two, you get free postage. You need one socket & two plugs, to do an exchange of actuators.
To, wire up, switch off power to the Control Panel, cut the existing 5 wire cable in half & then connect the control panel end to the new 5 way socket & then switch on power again. Exchange of units, is far easier & mor importantly quicker, as NO messing about, in the control panel.
Be careful, removing the motor from the pcb, via the 2.8mm spades, I have replaced mine, with a thicker spade 0.7mm, with a 0.85mm spade, to reduce them breaking off.
Hope all this improves your maintenance of these valves,
Al
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