Trouble keeping my cool!

2oldman wrote:

dougrainer wrote:
Are you on 50 amp service.

You could have 3 airs on a 30a coach?

NO, I was indicating he may be on 30 amp service or CHEATED 50 amp service, which would cause the EMS system to NOT allow all the compressors to come on. Cheated 50 amp service uses 1- 50 amp breaker jumped across the 2 hot legs which some EMS systems will rightly operate as 30 amp service. If on Cheated 50 amp service the inside EMS display panel will indicate 30 amp service. Doug

dougrainer wrote:
Are you on 50 amp service.

You could have 3 airs on a 30a coach?

At nine years I would just replace that middle unit. (assuming you follow Doug's advice to determine the issue is not something else)

How are you determining the amp draw? From the onboard EMS system? If so, that is pretty accurate. Are you on 50 amp service. I ask, because some EMS systems will shut down the compressor(fan stays running) when you pull more amps than can be supplied(30 amp service). If you pull 15 amps, that indicates the AC units are fully charged. I assume since you have the Drain hoses, you have RVP/Coleman AC units. Since you have RVP units, each unit has a water drain pump to pump the condensation out the drain lines. When the Drain system fails(clogged or the pump fails), then the water comes off the roof. I would suspect that in the past 10 years 1 or more of the AC units has been replaced or pulled for some service work. Inept Service Technicians usually FORGET to install the Divider GASKET that separates the Intake from the exhaust when replacing the upper unit on a top mounted bolt down unit. This will result in a severe lack of cold air volume into the roof AC ductwork and will cause the Freeze sensor to trip prematurely and cause a lack of condensation. The Best way to determine if this is the case is to pull the AC unit and verify the Gasket is installed. 3 AC units(ducted) should freeze you out in 85/90 degree weather. Doug

Sounds like it may be low on freon. Check for dirty plugged condenser first if not that and compressor and fan is running its probably low on Freon.

s there any cold air coming from that unit?
My first guess is the fan is running but the compressor is not!

How's the voltage?

I’d take the cover off and see if the condenser is dirty and make sure the unit’s ductwork isn’t compromised so it’s getting intake air from between the roof and ceiling.

But start getting your wallet ready.