The compressor fitted will , usually, be a 10 Cfm unit, unless it's a Delco then it's a 12CFm, so a similar size will be needed if keeping a similar systemT1 Terry wrote: ↑Sun Mar 03, 2024 11:27 amThanks Ron, I've been trying to get my head around what size the compressor needs to be and if I could add a second head unit in the bedroom if I did the dual compressor thing, would the belt driven unit be big enough to do both?Noggins wrote: ↑Sun Mar 03, 2024 9:51 am I'm looking at replacing the belt driven compressor with an electric driven unit so the front AC vents can run without the engine running .... and maybe a unit big enough for a second head unit for the bedroom .... a future project.
T1 Terry
Actually, you do not need to replace the belt-driven compressor, it's quite a simple process to fit a second parallel electric compressor and have a change-over switch relay to reroute the gas flow through the electric compressor.
Turn the ignition on and it uses the motor compressor, key off, uses electric compressor and 240V condensor fan = Simples
Your main problem will be a 240v fan big enough to keep the condensor in the circuit, a simple process if you have some old condensor units laying around to "borrow" a good fan from.
A/C for plant equipment used to be my specialty when the R.O.P.S ( Roll Over Protection ) was brought into force many years ago.
Ron
I still haven't found the condenser location, but then I haven't really looked. I can mount 24v fans on it if I can find it so it can run off the start batteries when the engine is running and the house batteries when parked up.
I did think about the electric air con system in the salvage MG4 I bought, it has reverse cycle and a heat exchanger because it also controls battery temp and motor transaxle and inverter temp along with climate control in the cabin, but I think I'll keep that intact for the big project of turning my '74 Kombi into an EV.
T1 Terry
To run 2 systems get a Delco ( GM Vehicles) and then you can use it to power both systems at the same time, remember as one is working flat out this end of the bus the other end may be just idling along or cycled out.
The motor-driven A/C system will usually have the condenser fitted in front of the radiator.
It may have a 12v / 24v fan forced condenser fitted elsewhere in the bus then it's an easy conversion to make it 240V with a small inverter to run it independently of the bus system.
Another way is to get a Condenser and Compressor from a BIG split system and use that for both the motor-driven system or the 240V system , depends on the available space around the bus to fit it.
