Refrigerator service valves and gauges
Refrigerator Troubleshooting – Line Tap Valves
These are sometimes referred to as piercing valves. They consist of a small clamp which is in two sections fitted to the pipework.
Totally sealed systems will involve the use of this type of valve in order to gain access to the system. A special charging/gauge adaptor is screwed on to the piercing valve assembly (see [...]
Refrigerator Troubleshooting – Schrader Valves
Modern service manifolds incorporate additional hand valves, connections for a vacuum pump, and a liquid-indicating sight glass. Some feature Schraeder valves in addition to the normal hand valves on the manifold. These additional valves make it possible to perform various operations without the necessity for removal of the manifold or hoses.
The Schrader valve is similar [...]
Refrigerator Troubleshooting – Removing Gauges
Once again, bearing in mind that high pressures are generated whilst a plant is operating, care must be taken not to pollute the atmosphere when gauges are removed. The following procedure will minimize the loss of refrigerant and discharge to atmosphere:
1. Back seat the discharge service valve.
2. Open both shut-off valves on the manifold and [...]
Refrigerator Troubleshooting – Fitting gauges
Although the task of fitting gauges is a simple one, it must be realized that any refrigerant has a pressure/temperature relationship: the higher the temperature of the refrigerant, the greater the pressure. It will be seen from the pressure/temperature chart at the end of this manual that any refrigerant, if subjected to even a normal [...]
7Nov2009 | admin | 0 comments | ContinuedRefrigerator Troubleshooting – Service Gauge Manifold
This is also called a system analyser. It consists of a manifold on the top of which are mounted two pressure gauges (Figure 5). Underneath the manifold are three external hose connections, and at either side of the manifold is a shut-off valve. These valves seat to a position at each side of the centre [...]
7Nov2009 | admin | 0 comments | ContinuedRefrigerator Troubleshooting – System Service Valves
When servicing or commissioning any equipment it is necessary to record the system pressures by fitting pressure gauges. To make this possible, all commercial systems generally include at least three service valves: suction, discharge and liquid shut-off.
Suction and discharge service valves may be located on the compressor body of both reciprocating open-type compressors and semi-hermetic [...]