Quote Originally Posted by Gary View Post
A chiller is a machine which cools water. This is a walk-in cooler, not a chiller.

Why is the low side pressure dropping? Are the evaporator fans stopping? Is the liquid flow restricting? Is the system undercharged? Does the thermostat control a liquid line solenoid valve? Is that valve installed backwards?

The low side pressure should not drop. You need to find out why it is doing so.
Yes the Tstat control a liquid line solenoid valve, The fans run non stop, The system have 50psi low side 200 high and no bubles in sigh glass (R22) Could the TXV BE THE PROBLEM????