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R22 and R410 are common.
That depends on the size of the coils and the length of line in between.
Absolutely not ... R410 operates at much higher pressures than R22, and mixing would do nothing but contaminate both refrigerants (and possibly mess up your system)
Chemical composition and properties, different system pressures, different pressure/teperarature relationships in when they'll change states from liquid to vapor... you never mix refrigerants, period.
Freon is another commonly used name for refrigerant, which can include R22, R410, and R12. The price per pound depends on which type, and should be only installed or sold by a certified technician. In most countries, the release or use of refrigerant by uncertified individuals is illegal.
r3.
yes
Low pressure for R 410 is 118 psi
High side is 413 psi and the low side is 336 psi
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You cannot charge s R22 system with R410A. You need to replace the Compressor, evaporator coil and check the piping sizes for R410. Also the oils have to be replaced. Vinay
Carrier Infinity with Infinity controls (R410 vice R22 freon) 4Ton is about a $6000 unit - though through scratch and dent or other discounts sometimes you can get them for less (10-20% less). Installed with taking your old equipment away would depend on your area and the hunger factor for your subs - should be no more than $8500 total. But that can be nibbled down with some shopping around. This is representative of a good price, but not the best price - the latter takes some dedication and skill (and luck) on your part.