Figure 22 Metrex Valve adjustment
Adjusting collar nut
Table 12 Refrigerant control settings psi (kPa)
Low Pressure | Low Pressure | High Pressure |
Cut Out | Cut In | Cut Out |
|
|
|
20 (137.9) | 65 (448.2) | 400 (2758) |
|
|
|
Manual Flushing
The valve may be flushed by rotating the socket head screw clockwise. This screw must be in the OUT position (counterclockwise) for normal valve operation.
4.4Motorized Ball
On digital scroll units, discharge pressure is controlled by a motorized ball valve. During unloaded operation, the pressure changes during each digital cycle could cause excessive repositions with a
4.4.1Control
The valve actuator operates on 24VAC power and is controlled by a
Control Method
The control utilizes an upper and lower pressure threshold with a 35psi (241kPa) deadband to reduce valve movement. If the liquid pressure is between the upper and lower threshold, the valve remains at the current position. If the liquid pressure exceeds the upper threshold the valve opens, and if the pressure falls below the lower threshold the valve closes. There are multiple adjustment bands to ease discharge pressure back into control range.
39