Noon-Air wrote:
"Jake" wrote in message
...

FWIW, Scrolls don't equalize pressures. Most manufacturers install hard
start kits on heat pumps and a/c condensers that have a very high
probability of being used on a coil that has an expansion valve on it.

Steve,

From Copeland's website technote on "Compliant Scrolls"...

Single Phase Starting Characteristics:

No start assist devices are ever required, even if a system uses non-bleed
expansion valves. Due to the inherent design of the Compliant Scroll, the
internal compression components always start unloaded even if the system
pressures are not balanced.

I don't doubt that the systems you installed had hard starts...

I just want to know why?

Why wouldn't they just employ bleed TXV's and the standard anti-restart
relay?

Just curious...

Jake


Jake,
You'll have to ask the engineers that design them.... I get them like that
out of the box.



And the KickStart devices quoted earlier are a combination of a
capacitor and a relay. For a system that already has a start capacitor
and relay, you only need to add a capacitor in parallel with the
existing start capacitor.

Per the Kick Start web site, their product does power factor correction
at startup (makes sense, big coil in the motor, inductive load, offset
by large capacitor). They quote power factor at start of as low as 0.50
and with a Kick Start device, as high as .98

For a system that is running on a generator, 0.50 PF vs 0.96 PF is a BIG
difference, and fixing this could make a BIG difference in BOTH
generator operation (lights do not dim) and A/C start.