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1jessicastafford 11-10-2017 10:01 AM

Furnace/heat pump
 
We have a 2018 Cardinal fifth wheel. We used the furnace and heat pump for the first time this weekend. Two separate questions...
First with the furnace, the thermostat is set to furnace and the fan will cycle on and blow warm air out of the floor vents, then cycle off. The entire time there is cold air coming from the round ceiling vents. Also, the furnace never completely shuts off, there is something running the whole time although not as loud as when the fan is blowing. So why is there cold air coming from the ceiling and why does it never shut off completely between cycles.
Second the heat pump, when I turn the thermostat to heat pump I only feel cold air out of the ceiling vents, it does not turn warm at all.

5picker 11-10-2017 10:10 AM

First question, if you have a digital thermostat and don't want the air coming out the ceiling A/C vents, set the fan (in fan mode) to AUTO.
This is a feature provided so the A/C blower distributes the warm air (that rises) throughout the coach. Having the fan on AUTO will stop this feature.

Second question, if the ambient temp is near the 40 mark, the heat pump is very inefficient and will not make warm air. Even when the heat pump is working, it can take minutes for warm air to come out the vents. How long did you wait?

rjshiflet 11-10-2017 01:14 PM

Quote:

Originally Posted by 5picker (Post 1667418)
First question, if you have a digital thermostat and don't want the air coming out the ceiling A/C vents, set the fan (in fan mode) to AUTO.
This is a feature provided so the A/C blower distributes the warm air (that rises) throughout the coach. Having the fan on AUTO will stop this feature.

Second question, if the ambient temp is near the 40 mark, the heat pump is very inefficient and will not make warm air. Even when the heat pump is working, it can take minutes for warm air to come out the vents. How long did you wait?



Great response and exactly what we have experienced in our Cardinal. Heat pump worked flawlessly as long as the outside temperature was above about 40.

1jessicastafford 11-11-2017 09:31 AM

The thermostat is digital but does not have an auto setting.
The outdoor temp was above 50 degrees.

5picker 11-11-2017 09:44 AM

Quote:

Originally Posted by 1jessicastafford (Post 1668192)
The thermostat is digital but does not have an auto setting.
The outdoor temp was above 50 degrees.

Could you tell us what model # you have and maybe post a photo of the 'stat?
Information such as system/appliance manufacturer and model #'s will garner you better responses.

Otherwise we are just guessing and giving suggestions based on past topics.

1jessicastafford 11-11-2017 09:52 AM

The control
 
1 Attachment(s)
..

5picker 11-11-2017 10:00 AM

From page 7 of the Dometic Digital thermostat manual...

"Mode Selection
Press the On/Off Mode button to advance through the available modes. Each successive press will advance to the next available mode. The green LED will indicate the mode selected. Depending on the systems installed, your choices will be Off, Fan, Cool, Furnace, Heat Pump or Heat Strip. See "Mode Description" on pages 8-10 for more information on modes. Fan Speed Press the On/Off Mode button until the fan green LED is lit. The LCD will show "Lo" (Low), "Hi" (High) or "Au" (Auto). Press the "+" or"―" button to select the desired fan speed. See "Special Features"on page 11 for more information on Auto Fan.

Thermostat Manual Page # 7

5picker 11-11-2017 10:04 AM

From page 8 of the manual...

"Furnace" - Furnace Mode

In this mode there are 3 fan speed selections:
Lo - (LOW): The fan operates continuously at low speed.
Hi - (HIGH): The fan operates continuously at high speed.
Au - (AUTO): The fan will be OFF.

Note: If additional indoor air circulation provided by the air conditioner is not desired during Furnace Mode of operation, select Au(AUTO) in the Fan Mode to shut the air conditioner fan off. If Lo(LOW) or Hi (HIGH) is selected the air conditioner fan will continue to operate on the selected speed.

1jessicastafford 11-11-2017 11:10 AM

As I cycle through the modes auto is not a choice on this control. I have the same control in the front of my coach but it runs the low profile AC only, no furnace or heat pump and it has an auto selection. I’m stumped.

Rich5117 11-12-2017 08:39 AM

Auto is located in the fan speed section when in Furnace mode. I read that wrong a lot of times, my wife read it and said check the fan speed section. We special ordered a heat pump on our Cedar Creek. So it came with this style stat.

1jessicastafford 11-12-2017 11:50 AM

Thanks everyone, I figured it out!

5picker 11-12-2017 01:12 PM

Quote:

Originally Posted by 1jessicastafford (Post 1668896)
Thanks everyone, I figured it out!

If you let everyone in on the fix, it helps others with similar issues.

1jessicastafford 11-12-2017 07:23 PM

I used the link to the manual online and the diagram and description on there helped with the series of buttons I need to push.

5picker 11-12-2017 07:30 PM

Super!
Glad you got it figured out.

Thurman 11-12-2017 07:42 PM

Someone please correct me on this if I'm wrong: From what I know an RV air conditioner, whether Dometic, Coleman, or Advent, are not true "heat pumps" as residential air conditioner/heat pump systems are. A residential A/C/heat pump has a reversing valve which allows the refrigerant to be pump backwards therefore capturing what heat may be in ambient air. I was taught that an RV A/C unit with "heat pump" configuration has an electrical heating element, much like an electric space heater, that has air flowing over it to create warm air.


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