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Re: [RFI] HVAC Variable Speed Motors

To: Hardy Landskov <n7rt@cox.net>, Rfi <rfi@contesting.com>
Subject: Re: [RFI] HVAC Variable Speed Motors
From: W2RU - Bud Hippisley <W2RU@frontiernet.net>
Date: Sun, 11 Apr 2010 08:47:53 -0400
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On Apr 10, 2010, at 7:43 PM, Hardy Landskov wrote:

> Of course now the natural question is the following:
> I am going to be in the market for a new heat pump this Summer. Does anyone 
> out there have a make/model number of a heat pump that does not use PWM 
> circuitry?

Hardy --

Even though I used to call on Carrier AC's engineering department, I'm no 
expert on heat pumps, but in researching the York HVAC site I did note that 
they seem to have non-PWM models right next to the PWM models like the Affinity 
series.  Just google your favorite manufacturer or google the brand carried by 
your favorite local HVAC dealer/contractor.

These PWM models seem to have gained traction because of the current IRS tax 
credit for high SEER units.  I suspect they're more expensive, for equal 
heating / cooling capacities, but up here in the frozen north we don't see many 
heat pumps of any kind....:-)

You could always procrastinate until the tax credit time frame runs out, then 
you will have no reason at all to buy a PWM version.

Bud, W2RU

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