I believe that a drip let is required between the appliance and the regulator. Am I correct? This is a 1977 single-family house with a propane-fueled heat pump unit that seems original.
Are you sure that is a heat-pump? Do you have a model number?
And yes, I would recommend a sediment trap.
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It depends on your local city/county inspector. Here…the Denver metro communities require a sediment trap or drip leg, but down in Colorado Springs, they are not required. In most places, they are unnecessary. Today and in most markets, natural gas is better processed with humidity removed and some of the trace gases that condense at higher temps removed.
Yes, it is a heat pump, and no model numbers are available.
This one is propane.
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Lon, I live in NC. I work mostly in Rocky Mount, but I also go to other cities and counties. How do we keep up with each jurisdiction’s requirements on this issue? I’m thinking that if there is so much room for varying requirements, the requirements themselves are not very scientifically based.
Ok…how did you come to the heat-pump conclusion?
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I concluded that it is a heat pump by its design, and secondly by what the owner who purchased the unit told me about the unit.
NC 2018 fuel gas code. May or may not have been applicable at the time of install, who knows? 
Edited for OP’s location.
Are you saying that without a spec plate or model number information we cannot determine if a HVAC system is a heat pump?
Thanks, I referenced this yesterday. Based on this I decided to call this out to the buyer.
I cannot. I was hoping you would share.
That would be a dual fuel heat-pump which is rare in my neck of the woods.
I’ll look for the article or video that Internachi has on this and post it here.
Brian, I couldn’t find the source on Internachi, but this link explains it the same way as I recall: How Do I Know If I Have a Heat Pump or an AC? | George Brazil HVAC | George Brazil Air Conditioning & Heating
So, which one of those methods in your link did you use to verify?
You’re correct it is a dual fuel system. According to the owner, they connected the gas supply so that they could have the option of using either electric or gas.
or its a gas pack
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Mark, even though the owner calls it a dual fuel heat pump, I looked at the thermostat for an emergency/ Aux heat setting and it does not have that option. I believe this is a gas pack unit because of the absence of the setting on the thermostat.
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Was there a reversing in the condenser section?
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It could be a an absorption heat pump, I personally have never seen one.
I wanted to let this play out before I stated my opinion, but from what I can see…that is a package unit. It contains an air conditioner and a gas furnace in one packaged unit. Very typical. Your thermostat states that it does not have auxiliary heat, that’s it.
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