Vacuum Pump Procedure for MrCool
I’m running my lineset tomorrow weather permitting.
I’m getting hung up a bit on vacuum procedure with this particular model.
I have a mr cool universal (rebadged midea i think) and from what the manufacturer is telling me the coil and condensor are precharged. The liquid and gas valves @ the condensor and air handler are both equipped with stop valves.
So my hang up is pulling a vacuum with this setup.
Can i pull from either unit indoor or outdoor? Inside would be way easier for me.
Here is my game plan
1)Remove valve core from both liquid and gas valves at the air handler side.
2) pressure test both lines
3) pull a vacuum on the gas valve(3/4″ line)
4) open stop valve on gas line at the air handler. Reinstall valve core.
5) repeat steps 2&3 on liquid line(3/8″).
6) open stop valves on condensor.
Is this the correct methodology?
Not as pressing hard but still in the back of my mind.
The install manual calls for a 5 wire thermostat wire however the motherboard has 6 spots.
B,W1,R,C,G,Y. the manual omits Y . Im calling the manufacturer monday on this.
Lastly I opted for an 8kwh heat kit that comes with a 45amp breaker. The blower motor calls for a min 4amp max 15amp. The wiring diagram on the unit states to omit the wiring to motherboard if using a heat kit. So my math is as follows
8000 watts/240= 33amps + 4amps.
Puts me at 37amps on a 45amp breaker. Mr cool rep says to wire the motherboard on a separate breaker but then said I could do it as the diagram states. I don’t see the need to take up more breaker spaces if not necessary. I’ve wired only the 45amp side unless someone here has a different opinion.
The manual is lacking to say the least and tech support is fair.
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