Re: Line Voltage monitoring - do I need to...

On Thu, 29 Nov 2007 03:09:55 +0000 (UTC), David Lesher
<wb8foz@xxxxxxxxx> wrote:

Fred Bloggs <nospam@xxxxxxxxxx> writes:


So I'm installing a line voltage monitor [if not a

<http://www.globalspec.com/FeaturedProducts/Detail/TimeMark/Model_2621_Voltage_Monitor_Dual_Set_Point/15169/0?fromSpotlight=1>
then similar] to protect a single-phase 240V residential heatpump
from
self-destructing during windstorm-instigated power flaps. It will
trigger
a 5-10 minute shutdown period.

What you're after is called "short cycle protection." Most modern
units
have these built in, but if not then you can buy an "aftermarket"

The system has short-cycle protection, but it's designed to delay
restarts, not drop the unit off-line during these kind of flaps.
{Or if it was, it's mis-designed...}


If the heat pump uses a permanent split capacitor motor what you
really need to ensure ultimate protection is something like this
http://www.pne.com.au/files/i-Start_datasheet_May_2006.pdf

Whichever method you use the heat pump should be wired via a dedicated
circuit breaker in the mains distribution box.
.

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