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Old 01-14-2007, 05:34 AM   #1
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When cold camping a few weeks ago, I left the Tstats on heat pump when the temps were in the 40s..they worked great too! At the upper 30s the rear system changed over to Hydrohot and worked fine...the front heatpump fan quit working but the compressor kept running and it never switched to H Hot..wassup wit dat??? A simple fix//probably NOT?
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Old 01-14-2007, 05:34 AM   #2
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When cold camping a few weeks ago, I left the Tstats on heat pump when the temps were in the 40s..they worked great too! At the upper 30s the rear system changed over to Hydrohot and worked fine...the front heatpump fan quit working but the compressor kept running and it never switched to H Hot..wassup wit dat??? A simple fix//probably NOT?
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Old 01-14-2007, 05:54 AM   #3
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I am not aware of the auto change over feature from Heat Pump to Hydro Hot heat. Is this in the MA manual? Don't you have to set the thermostat on Heat Pump and to Furnace for the Hydro Hot heat? I use the heat pumps in the spring and fall when outside temp is 45 or higher. I prefer the Hydro Hot since it is quieter.
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Old 01-14-2007, 06:04 AM   #4
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I remember someone here mentioning the auto switchover feature. If not, then why did my front heatpump fan quit and the compressor kept running..but only when in the upper 30s and below...worked perfectly as a heatpump in the 40s
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Old 01-14-2007, 06:16 AM   #5
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Not sure, heat pumps generally stop working in the 40 degree range. When the temp is going below 45, I use the Hydro Hot. The heat in the water compartment only works when Hydro Hot is on.
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Old 01-14-2007, 07:03 AM   #6
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Just curious, given that this is a real function, what is the indicator to switch to HH.

Is it outside temperature?

I have been through every manual and didn't find this as an option. Although the DSDP might have a less sophisticated thermostat.
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Old 01-14-2007, 07:53 AM   #7
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I really dont know, but DO know that my rear system changed to HH by itself when temps went into the high 30s and my front heatpump quit.
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Old 01-14-2007, 08:37 AM   #8
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Check out your thermostat. You may have had #1 - front on heat pump and the #2 on Furnace (HH). Since the system is ducted, you may feel heat coming out overhead from the #1 unit in the rear and the HH may have come on when #1 heat pump could no longer keep up with the cold, depending on your temp settings on the thermostat. Just a guess.
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Old 01-14-2007, 09:24 AM   #9
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nope...thats not it...BOTH were set to pump and HH started working in rear when colder outside
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