10-19-2019, 04:57 AM
To add a few more bits to the excellent info Tom and Steve have provided.
I have a Jun Air pump also. I have had Thomas and Gast pumps. You cannot hear or feel the Jun Air run. They can be pricey, but homeboy didn’t like the compressor cycling to wake him up at night.
One, whatever compressor you choose, it must have a check valve to prevent the system pressure from feeding back into the compressor, and it must have a pressure relief at the end of the cycle to release the pressure on the compressor so that the compressor does not start against a high head pressure.
You will probably find in the compartment with the generator blower the classic well pump switch. The compressor is turned on and off by that switch. You will also find a second box wired in with the well pump switch with an electrical relay. That box is controlled by the HWH leveling system. The HWH leveling system turns on the compressor whenever the HWH system calls for air. Be aware that the HWH activated relay BYPASSES the well pump switch, and therefore the compressor will generate pressure up to it’s max rating. Which is 150 psi for a Thomas compressor. There should be a Norgren pressure relief valve somewhere around the pneumatic piping close by those two switches to prevent you from overpressuring the air bags.
I personally do not like, detest, hate, strongly advise against, and generally despise leaving the coach in the auto level mode. I do not like the algorithm that HWH uses. It will lower, lower, lower until one of the low pressure switches in the manifold tell it to stop. Then it raise until it maxes out, then it starts lowering again. Because the low pressure switches in the six pack manifolds are usually disconnected, the auto level algorithm can really put the coach in a twist. Plus I don’t like sleeping in a roller coaster.
If the coach won’t stay reasonably level for a couple of days, then there is an air leak in one of the air bags or it’s supply. That should be looked after.
Of course my diatribe about the HWH autolevel feature is purely my opinion, and others feel very differently about it.
I have a Jun Air pump also. I have had Thomas and Gast pumps. You cannot hear or feel the Jun Air run. They can be pricey, but homeboy didn’t like the compressor cycling to wake him up at night.
One, whatever compressor you choose, it must have a check valve to prevent the system pressure from feeding back into the compressor, and it must have a pressure relief at the end of the cycle to release the pressure on the compressor so that the compressor does not start against a high head pressure.
You will probably find in the compartment with the generator blower the classic well pump switch. The compressor is turned on and off by that switch. You will also find a second box wired in with the well pump switch with an electrical relay. That box is controlled by the HWH leveling system. The HWH leveling system turns on the compressor whenever the HWH system calls for air. Be aware that the HWH activated relay BYPASSES the well pump switch, and therefore the compressor will generate pressure up to it’s max rating. Which is 150 psi for a Thomas compressor. There should be a Norgren pressure relief valve somewhere around the pneumatic piping close by those two switches to prevent you from overpressuring the air bags.
I personally do not like, detest, hate, strongly advise against, and generally despise leaving the coach in the auto level mode. I do not like the algorithm that HWH uses. It will lower, lower, lower until one of the low pressure switches in the manifold tell it to stop. Then it raise until it maxes out, then it starts lowering again. Because the low pressure switches in the six pack manifolds are usually disconnected, the auto level algorithm can really put the coach in a twist. Plus I don’t like sleeping in a roller coaster.
If the coach won’t stay reasonably level for a couple of days, then there is an air leak in one of the air bags or it’s supply. That should be looked after.
Of course my diatribe about the HWH autolevel feature is purely my opinion, and others feel very differently about it.
Richard and Rhonda Entrekin
99 Newell, 512
Maverick Hybrid Toad
Inverness, FL (when we're home
)