Just added a gas heater inline with heat pump, does anyone know how the heat pump preference mode works?

Mcaveman

Well-known member
Aug 28, 2016
88
Baltimore Md
Both heaters are working and everything is good , was just curious how the heat pump preference mode works or determines which heater to use and is there any settings I can play with ? Couldn’t have installed it without the help of this forum , thank you !
 

ChristopherDB

Gold Supporter
In The Industry
Apr 21, 2021
82
Florida
Pool Size
16000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Jandy Aquapure 1400
I'm curious about the same. I'm about to add an electric heater on top of an existing Jandy JXi400n. Looking at an Aquacal. I have an Aqualink RS and have the plumbing pre-setup for this.
 

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ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
29,084
Northern NJ
Pool Size
35000
Surface
Plaster
Chlorine
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
This is my understanding of how it works with the IntelliCenter…

You can have both a Pentair MasterTemp gas heater and a UltraTemp Heat Pump on a pool. They are plumbed in line and hooked up to the IntelliCenter via RS-485 cable. In the programming you have a choice of heaters for your spa and/or pool.

The automation is supposed to regulate temperature via the heat pump 1st - if it can not maintain temp it reverts to the gas heater. But after that it does not go back to the heat pump to maintain. You have to switch it manually.

 

swamprat69

Well-known member
Mar 30, 2019
590
Las Vegas, NV
Heat pumps are way more efficient at producing heat than gas heaters. Ideally with a large temperature difference between the starting pool temperature and the pool temperature that you want, you would run both at the same time. Although the heat pump would be adding less heat, it would be doing so at a lower cost. As you approach the pool temperature that you are trying to achieve, the gas heater would drop out. If the heat pump could not maintain the desired temperature, the gas heater would kick back in. I have worked in the controls side of HVAC for many years and many dual fuel home heating systems are controlled in this manner. Controls wise you can even set a variable temperature band between the point where only the heat pump is running and both are running depending on how your controls are set up. Initially dual fuel home systems were set up to disable the heat pump below 30 degrees, but current thinking has lowered the cutoff to 0 degrees or less. Although the heat pump output is much less at lower outdoor temperatures, it is still much more efficient than gas heat.
 
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