Manifold Gauge Set - General Information

Manifold Gauge Set - General Information

The manifold gauge set is the most important tool for tracing faults and system efficiency assessment. The relationship to each other of HIGH and LOW pressures and their correlation to AMBIENT and EVAPORATOR temperatures must be compared to determine system status (see Pressure/Temperature graphs). Because of the heavy reliance upon this piece of equipment for service diagnosis, ensure that the gauges are calibrated regularly and the equipment is treated with care. Pressure/Temperature Graphs






Manifold.
The manifold is designed to control refrigerant flow. When connected into the system, pressure is registered on both gauges at all times. During system tests both the high and low side hand valves should be closed (rotate clockwise to seat the valves). The hand valves isolate the low and the high sides from the centre (service) hose.

Low Side Pressure Gauge.
This compound gauge, is designed to register positive and negative pressure and may be typically calibrated - Full Scale Deflection, 0 to 10 bar (0 to 150 lbf/square in) pressure in a clockwise direction; 0 to 1000 mbar (0 to 30 in Hg) FSD negative pressure in a counter clockwise direction.

High Side Pressure Gauge.
This pressure gauge may be typically calibrated from 0 to 30 bar (0 to 500 lbf/square in) FSD ins clockwise direction. Depending on the manufacturer, this gauge may also be of the compound type.