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The MA-1 bomber jacket (also known as the MA-1 flight jacket) is an American military jacket which was developed in the 1950s. The MA-1 and its predecessor, the B-15 flight jacket, were originally developed and needed at that time because the emergence of the jet age created new requirements for pilot performance, safety, and comfort.

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  1. T

    Drayton MA1 mid position actuator intermittent fault.

    Can anyone advise what could be the cause and how to overcome an actuator intermittently not responding when boiler is calling for heat. Possibly slightly loose fitting to valve, as actuator re-activates with hand pressure movement when boiler is calling for heat. This is an intermittent fault...
    • Tomcat
    • Thread
    • actuator america drayton fault intermittent ma1 mid position position usa
    • Replies: 3
    • Forum: USA
  2. H

    Mid position actuator newly installed issue

    Hi, I had a Drayton ma1 mid position actuator recently installed as central heating had stopped working. Now my heating and hot water will not come on at the same time (with timed settings) and I have been advised that my thermostat is not working which is causing the problem (from the emergency...
    • Hlruk1
    • Thread
    • actuator america drayton installed issue ma1 mid position newly position usa
    • Replies: 25
    • Forum: USA
  3. P

    Drayton Mid Position Activator MA1 always live?

    My Drayton Mid Position Activator MA1 is working perfectly but I noticed that it is always warm to the touch even when the central heating and hot water is switched off and the pipes are cold. On removing the cover I find that the motor is quite warm and buzzes faintly. Should the motor be...
  4. P

    Problems with Drayton MA1 mixer valve

    Hi from a new member and thanks for taking the trouble to read this. Problem is that the water has not been heating. Inspecting the MA1 actuator shows the black lever firmly in the H sector and I assume it should go to either the M or W when the cylinder thermostat is demanding. I flipped off...
    • Peaky
    • Thread
    • actuator degrees drayton ma1 mixer mixer valve movement problems valve
    • Replies: 4
    • Forum: Plumbing Jobs | The Job-board
  5. J

    Faulty Drayton MA1 Mid Position Valve

    Hi I have a Drayton MA1 Mid Position Valve that seems to be faulty. If it goes past the M position to W to call for hot water, it will not move back to the M or H position unless I manually override using the little black button at the base of the unit. The system heats water perfectly...
  6. C

    Problem with Drayton MA1 mid-position actuator

    Hi all - we recently had a problem with the above item causing an extremely loud vibration noise in the pipes which was waking the whole house (but otherwise working fine) and I was told we needed to replace it. I "went cheapskate" and bought one off ebay which had supposedly been sitting on a...
  7. T

    Very unusual problem with Drayton MA1

    Have a MA1 that works well in that when CH calls it moves across and delivers this as expected and when HW calls it moves across and delivers this perfectly, so spindle isn't sticking and general mechanics seem fine BUT It doesnt ever allow both CH AND HW at same time when both are calling for...
  8. E

    No heating after MA1 change!

    Hi guys, Having a bit of a headache after attempting to rectify a 'simple' fault on my system. After having trawled thru pages of posts relating to Drayton MA1 3-port valves, I haven't yet come across the same problem? After coming home this week to no heating but hot water only, I...
  9. B

    Sunvic relay junction box connected to Drayton MA1 Valve

    Having been told by Sunvic and Drayton that I couldn't wire a Drayton MA1 mid position valve to a Sunvic RJ 2801or 2802 relay junction box I set out to do just that! After some head scratching with the RJ wiring diagrams the result was amazingly simple and was fully tested in all the Htg and HW...
  10. D

    Drayton MA1 3 port Motorised valve question

    Hi, I beleive I have a faulty Drayton MA1 3 port motorised valve. I intend to replace just the actuator, but would appreciate if someone could shed any light on the following. If I take the actuator off, and move the spindle with my fingers, it only moves 45 degrees from one side to the other...
    • donkeeboy
    • Thread
    • 3 port actuator degrees drayton ma1 motorised motorised valve question spindle valve
    • Replies: 6
    • Forum: Plumbing Jobs | The Job-board
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