If the evaporator fan stops, will any fan of the same diameter work in its place? And if the technician says the expansion needs to be changed, is the size of the connection sufficient to request a replacement? In both cases, the size is part of the selection. The fan has electrical specifications and airflow direction, and the expansion valve has capacity, type of refrigerant, and operating conditions.That's why knowing the function of the part helps you understand what data you need before purchasing.
1. Technician tools and VALUE equipment
| The tool | What is it used for? | What should you review before purchasing? |
|---|---|---|
| Service Ratchet | Opening and closing the stems of some service valves, especially those with a square head. The ratchet mechanism helps in tight spaces. | The shape and size of the valve head. |
| Manifold Gauge | Reading circuit pressures and connecting service hoses according to the type of work. | Pressure range, and compatibility of gauges, hoses, and connections with the equipment and refrigerant. |
| Vacuum Pump | Removing air and helping to eliminate moisture from the circuit before charging. | Pump capacity and type of connections. A micron gauge is a separate tool to check the level of vacuum. |
| Charging Scale | Measuring the weight of the refrigerant during charging or recovery. | The maximum weight the scale can handle and the required reading accuracy. |
| Tube Cutter & Flaring Tool | Cutting copper pipes and preparing their ends for flare connections in the systems you use. | Range of pipe diameters and type of connection. |
VALUE is one of the brands that offers service equipment such as vacuum pumps, manifolds, flare tools, and pipe fittings. If you are preparing a technician's bag, think of each operation separately. There are tools for pipe preparation, pressure measurement tools, evacuation tools, and tools for measuring charge weight. The kit catalog shows the included tools and the sizes of each one.
2. Refrigerant and its types in cooling and air conditioning
Refrigerant is the common name in the market for the cooling medium. The types you may encounter vary depending on the application and the age of the equipment.
| Cooling medium | Examples of its use |
|---|---|
| R22 | Some older air conditioning units and refrigeration units. |
| R134a | Some chillers and commercial refrigeration equipment. |
| R404A and R507A | Commercial refrigeration units and freezer storage rooms designed for their use. |
| R407C and R410A | Some air conditioning systems, depending on the model of the equipment. |
| R32 | Air conditioning units and equipment designed for it, with safety requirements related to its classification A2L. |
| R448A and R449A | Options that can be considered for converting some systems R404A and R507A according to the manufacturer's specifications. |
Before ordering the cylinder, read the full code from the equipment data plate. And if the unit has been converted before, check the conversion label and maintenance record. Changing the refrigerant is a technical decision that may affect the compressor's performance, the expansion valve, and control settings.
3. Expansion and solenoid | Each valve has a function
Thermal expansion valve (TXV) regulates the feed to the evaporator with the refrigerant based on superheat, which is the difference between the refrigerant vapor temperature at the evaporator outlet and the saturation temperature corresponding to its pressure. Some valves have changeable orifices. To choose the valve and orifice, you need the type of refrigerant, the capacity of the evaporator under operating conditions, the available pressure difference across the valve, and the type of balancing and connections.
Electronic Expansion Valve (EEV) It changes the valve opening at the command of a controller based on sensor readings. Choosing the alternative includes the valve's compatibility with the controller and application specifications.
Solenoid Valve Its function is to open or close the refrigerant path with an electrical signal. If changing only the coil, match the voltage and frequency and its compatibility with the valve body. If you are changing the entire valve, also check its type Normally Closed or Normally Open and the operating pressure and type of connection.
4. Condenser and evaporator fans | Diameter is the starting point for selection
Condenser fan moves air through the condenser coil to expel heat. Evaporator fan moves room air through the evaporator and helps distribute cooling. When replacing, check the airflow direction, voltage, number of phases, frequency, speed, and mounting method, along with the diameter. If you are only changing the motor or blade, match the rotation direction according to the manufacturer's data.
For example, if the fan stopped during the defrosting and resumed afterward, this could be part of the control method for the evaporator. If it remains stationary during the cooling cycle, the technician should check the power supply, control, and motor before requesting a replacement.
5. Small spare parts that affect circuit performance
| Part | Function | Useful data when ordering |
|---|---|---|
| Filter Drier | traps impurities and absorbs moisture. In the liquid line, it helps protect the expansion valve. | Its location in the circuit, type of refrigerant, capacity, and size and type of connection. |
| Sight Glass | It allows you to see the liquid's status, and some models have a humidity indicator. | The connection size and operating pressure, and whether a humidity indicator is required. |
| Defrost heater | It melts the accumulated ice on the evaporator in systems designed for electric defrosting. | Evaporator model, voltage, wattage, length, and shape. |
| Ball Valve | It isolates part of the circuit during operation. | Connection size, type of refrigerant, and operating pressure. |
| Check Valve | It allows flow in one direction. | Flow direction, connection size, and operating conditions. |
Bubbles in the sight glass are an important example.They may appear due to low charge, or due to pressure drop across the dryer filter, or insufficient cooling without saturation in the liquid line. That's why the technician correlates what they see with measurements before deciding whether the circuit needs charging or addressing another cause.
Before you request a spare part, what should you send?
A picture of the unit's data plate, a clear picture of the old part, and the full code if visible.And if you are requesting a fan, take a picture of the motor label and the airflow direction if indicated. And if you are requesting an expansion, add the type of refrigerant and evaporator data, as the choice of valve and orifice is related to operating conditions.
Are you preparing a maintenance bag or looking for a replacement part?Send pictures of the equipment and codes to the teamBassem for Refrigeration Industriesto help you match the specifications before purchase.