Now that it's getting closer to spring, I've been thinking about the 120 volt air conditioning project again. The simplest solution is a RV rooftop air conditioner, except I have only 4" of clearance on my garage door. I also thought about adding the Hoseline 120 volt air conditioner package - this comes standard on many newer ambulances, but it can be added as a retrofit. The challenge is that the Hoseline evaporators have three sets of coils - one set for the hot water heating system, one for the vehicle supplied air conditioner, and a third set for the 120 volt package. The end result is an air conditioner evaporator that is usually about 20" deep. Any trade off on depth increases the height.
I have a Medic Master ambulance, and there just isn't room for anything standard, which means that I will have to build my own. I was able to fins a Hoseline 120 volt R134 compressor package on ebay, and I have other Hoseline AC components. Since I just plan for this to be a totally separate system that doesn't interconnect with the vehicle AC system, the control panel is much simpler than Hoseline's design, and only needs four relays (120 volt heat relay, time delay relay, condenser fan relay, 120 volt compressor relay). It will be controlled by a Hoseline CM-3000 thermostat with a Hoseline RCB-3000S relay panel.
Instead of adding a coil to the existing Hoseline evaporator/heater package, I've been leaning toward a totally separate evaporator mounted in the rear of the module (ambulance portion of the vehicle). This system was commonly used to add air conditioning to a non-air conditioned car back in the 1960's-70's, but it is still available for off road construction equipment.
It will take a bit more research----
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