The standard factory setting for the CRO in 0/60 psig) range of 30 psi. Because these valves adjustable parameter can be changed with the specific requirements of the system. The CRO should be adjusted at runtime when the evaporator pressure above the required parameter. The final configuration of valve must be below the maximum suction pressure recommended by the compressor or the device manufacturer.
The main goal of the CRO-prevent compressor and motor overload due to high pressure suction. Thus, it is important to arrive at the correct pressure setting. The best way to see if the motor is overloaded-check the current at start-up or after defrost. If the overload is obviously a suction-gage should be put on the compressor. CRO parameter may be too high and can be adjusted. If the compressor is overloaded and CRO relief valve, the following procedure should be followed.
The device should be turned off for long enough to equalize the pressure in the system. Watch suction pressure as the unit of origin, because this pressure control valve.
If the parameter is decreased, slowly adjust the valve in a counterclockwise direction about a quarter of a turn for every 1 psi pressure necessary changes. After a few minutes of work, the device must be cycled off and the system pressure is allowed to call again. Watch suction pressure (valve setting) as the unit began to rise. If the value is still too high, an adjustment must be repeated. The right size, hex key is used to adjust the valves. Clockwise rotation increases the valve assemblies and counterclockwise decreases the value of the parameter.
When CROS are installed in parallel, each of which must be adjusted in the same amount. If one valve was corrected on more than another, better performance will happen if and adjusted all the way in before it is discharged the same number.
Expansion valves