Adding A/C & Heat

[Clifton]

I'd rather be comfortable in the heat and cold than have the space.
Remember - the heater and blower motor don't work.

If the heater doesn't work either, this fits in the stock location and does both.
https://vintageair.com/gen-ii-mini-heat-cool-and-defrost/

[dakazman]

  Clifton, did you buy this safty switch and how did you add i to the system?
 A COMPRESSOR SAFETY SWITCH MUST BE INSTALLED ON EVERY A/C SYSTEM. A BINARY SWITCH
(PART# 24679-VUS) DISENGAGES THE COMPRESSOR CLUTCH IN CASE OF EXTREME LOW PRESSURE
CONDITIONS (REFRIGERANT LOSS) OR EXCESSIVELY HIGH HEAD PRESSURE (406 PSI.) TO PREVENT
COMPRESSOR DAMAGE OR HOSE RUPTURE. A TRINARY SWITCH (PART# 24678-VUS) COMBINES
HI/LOW PRESSURE PROTECTION WITH AN ELECTRIC FAN OPERATION SIGNAL AT 254 PSI. COMPRESSOR
SAFETY SWITCHES ARE EXTREMELY IMPORTANT SINCE AN A/C SYSTEM RELIES ON REFRIGERANT TO CARRY
LUBRICATION THROUGH THE SYSTEM.
  does it modulate when RPM low?
Dakazman

[Clifton]

  Clifton, did you buy this safty switch and how did you add i to the system?
 
  does it modulate when RPM low?
Dakazman

Yes, I have a brinary switch that mounts in the top of the dryer. I'll get a pic this afternoon. It has a low pressure shutoff but it allows the clutch to engage and turn on. Maybe it has a delay? The pressures on the VA systems are lower than most R134 systems. 6-15 psi low side. High side the same 2 x ambient plus some %, I can't remember off the top.

My fans are separate, off the clutch signal. Staggered to come on with a delay relay so everything doesn't pull too many amps at once.

[Clifton]

Here's the dryer and while I was there, the fittings on the lines.