Multimeters can measure the resistance in ohms (£2) of all or any part of the circuit. Resistance values o f HVAC components can vary greatly…

Ammeters measure current flow through a circuit. Depending on the level of the current being measured, the ammeter reads in amperes, milliamperes (one thousandth of…

The procedure used for disconnecting the gauge manifold set varies, depending on the type of service valves installed in the unit. If the unit being…

For years, refrigerant has been used to purge air from the service hoses prior to making the final connection to the unit. Obviously this causes…

Figure 3-15 shows how the flow of refrigerant through the gauge manifold set is controlled. The hand valve on the left controls the flow to…

This section describes the basic procedures you will need to correctly operate the gauge manifold set. The gauge manifold set is one of the most…

The Schrader valve uses the same type af valve core as used on automobile tires. It has a spring-loaded, gasketed core which closes when released…

Used solely to provide access to the closed refrigerant system. It is not installed in the normal path of refrigerant flow through the system. The…

The valve positions used in this description are defined as follows: Back-Seated – Valve stem turned all the way out (fully counterclockwise). Front-Seated – Valve…