Heat redistribution/timer [RE-wrenches]

[William Miller]

How about an irrigation timer?

William


At 02:36 PM 2/21/01 -0800, you wrote:
>Gary,
>The problem I see is 24 cycles/day on a DC-powered timer; it's probably a
>custom unit.  I did a similar approach recently with an AC well pump, but I
>only needed 2 cycles/day.  AEE sells a 12V/24V DC analog timer, part
>#52-520-016 ($90 retail) to control the relay.  Their catalog suggest a
>minimal on or off cycle of 15 minutes, using trippers to activate a switch.
>As extra trippers can be added, in theory you could do 48 cycles/day...but
>the switch might wear out in a few years, and it's pretty spendy...
>If you use a T240, make sure that the relay controls the input side, to
>avoid phantom loads.  Also use a DC coil relay, for same reason.  But
>hey--if the motor is only 1/3 hP, it's probably reconnectable as 120VAC.
>Have you checked that out?
>
>Allan at Pos E
>
>----- Original Message -----
>From: "Gary Higbee, Solutions from the Land" <ghigbee at efn.org>
>Subject: Heat redistribution/timer [RE-wrenches]
>
>
>> I'm working with a client who would like to be able to run his 1/3hp
>> 240-volt circulating fan.
>
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William Miller
SLO Communications: Communications and Power Systems Consulting
Chief Engineer, KCBX: NPR and PRI for San Luis Obispo and Santa Barbara
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____________________________________________________________
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