Q1. How much is R600 Gas Running Pressure and Standing Pressure? Ans. R600 RunningĀ  Pressure is 0 Psi to 2 Psi and Standing Pressure is 40 Psi to 50 Psi. Q2. What we can Attach 2 Ton indoor Unit with 1.5 Ton Outdoor unit ? Ans. Yes we can Attach 2 Ton indoor with 1.5