AC won't run on 30 amp power?

[Shipper]

Have Phaeton with three 15K ACs with separate controls and breakers for each one. The convection oven works on the 30 amp power, but only the fans will run on the ACs either separately or together. All work on 50 amp shore power (which is not available) or generator. What am I missing (except some cool air)? Thanks for any help!

[dougrainer]

Shipper wrote:

dougrainer wrote:
Tiffin uses the PCS system Power EMS system. It sheds the compressor's if the amp draw is too high on some Tiffin models. You don't state what year Tiffin. That would help. On other Tiffins it sheds the complete Power to the AC's. Regardless, there is a EMS monitor panel in the RV usually located above the drivers seat in one of the overhead panels. On newer Tiffins with the LCD SPYDER control system this display is integrated in the 7 inch LCD panel in the Hallway by the middle bath. Doug

Problem solved! The SPYDER control system was set on 15 amps (don't know why) and changing to 30 amps works one AC and everything else that is necessary. Thanks to all for your help.

PS: This was a friend's new Phaeton and he went through the first night without air, but he is near the NE end of Florida and it was a cool night.

It comes from Tiffin with the preset at 30 amps default. He or someone else changed the setting. The Precision EMS system is a very good EMS system, much better than the Intellitec. Doug

[Shipper]

dougrainer wrote:
Tiffin uses the PCS system Power EMS system. It sheds the compressor's if the amp draw is too high on some Tiffin models. You don't state what year Tiffin. That would help. On other Tiffins it sheds the complete Power to the AC's. Regardless, there is a EMS monitor panel in the RV usually located above the drivers seat in one of the overhead panels. On newer Tiffins with the LCD SPYDER control system this display is integrated in the 7 inch LCD panel in the Hallway by the middle bath. Doug

Problem solved! The SPYDER control system was set on 15 amps (don't know why) and changing to 30 amps works one AC and everything else that is necessary. Thanks to all for your help.

PS: This was a friend's new Phaeton and he went through the first night without air, but he is near the NE end of Florida and it was a cool night.

[wa8yxm]

Shipper wrote:

pianotuna wrote:
How is the voltage when running the convection oven?

The convection pulls about 12 amps voltage at 118. It's a 2019 Phaeton and everything including the refer is off. Just trying to run one AC. It seems a load control might keep even one from operating.

Yes it should allow one to run on 30 but... There may be an operator setting (I do not know since I don't have one) I have read of some that have a switch that must be switched to the proper position.

I use a different form of energy management on my Unit... (Split load. one A/C can be "Divorced" from the rest of the RV electrically_ )

[Shipper]

pianotuna wrote:
How is the voltage when running the convection oven?

The convection pulls about 12 amps voltage at 118. It's a 2019 Phaeton and everything including the refer is off. Just trying to run one AC. It seems a load control might keep even one from operating.

[MrWizard]

Your only going to be able to run (1) A/C unit
And only if you eliminate other high draw items

Water heater and fridge on LP, batteries nearly charged up, light draw only
Turn A/C to fan fit ten minutes then switch to cooling mode

If you need the mw or convection oven you might need to turn the A/C to fan
Depending on the load shed capabilities

[pianotuna]

How is the voltage when running the convection oven?

[dougrainer]

Tiffin uses the PCS system Power EMS system. It sheds the compressor's if the amp draw is too high on some Tiffin models. You don't state what year Tiffin. That would help. On other Tiffins it sheds the complete Power to the AC's. Regardless, there is a EMS monitor panel in the RV usually located above the drivers seat in one of the overhead panels. On newer Tiffins with the LCD SPYDER control system this display is integrated in the 7 inch LCD panel in the Hallway by the middle bath. Doug

[Slownsy]

30A only 1 air conditioner at the time.
Frank

.

[wa8yxm]

DO you have an Intelletec Energy Management System (load Shedder) I'm guessing that's your problem. On 30 amps it will show you the amps you are using. It may be set to turn off all A/C's or it may be feeding other loads or it may need a reset. a Fuse or...... Maintenance.

[Chum_lee]

"What am I missing?"

50 + 20 = 70 additional amps of 120V power (which your system needs to have everything work reliably)

Chum lee

[enblethen]

Is 120 volt water heater on?

[rk911]

will one of them run? are you trying to run the AC while using the cooktop?