A pass through dishwasher is a staple in many commercial kitchens, from bustling restaurants to large catering services. At the heart of its cleaning efficiency are the spray arms. These components play a crucial role in delivering high - pressure water to effectively remove food particles and grease from dishes. As a pass through dishwasher supplier, I understand the importance of ensuring that the spray arms are working properly. In this blog, I'll share some practical steps on how to check the functionality of spray arms in a pass through dishwasher.
Visual Inspection
The first step in checking the spray arms is a simple visual inspection. Start by powering off the dishwasher and opening the access panel to reach the spray arms. This is usually located inside the dishwasher chamber.
Inspect the spray arms for any visible signs of damage. Look for cracks, chips, or bent parts. Cracks can cause water to leak out in the wrong direction, reducing the pressure and effectiveness of the spray. Bent spray arms may not rotate properly, leading to uneven cleaning.
Check the nozzles on the spray arms. Over time, these nozzles can become clogged with food debris, scale, or limescale. A clogged nozzle will restrict the flow of water, resulting in poor cleaning performance. You can use a flashlight to get a better view of the nozzles. If you notice any blockages, use a small brush, like a toothbrush, to gently clean the nozzles. For more stubborn blockages, you can soak the spray arms in a descaling solution.
Rotation Test
The spray arms in a pass through dishwasher are designed to rotate while spraying water. This rotation ensures that water reaches all areas of the dishes. To test the rotation, start the dishwasher on a short cycle. Observe the spray arms through the inspection window if available.
The spray arms should rotate smoothly and evenly. If you notice that the spray arms are not rotating at all, there could be a problem with the motor that drives the rotation or a mechanical obstruction. Check for any loose parts or debris that might be preventing the rotation. Sometimes, a small piece of food or a utensil may have fallen into the mechanism.
If the spray arms are rotating but seem to be doing so sluggishly, it could be due to low water pressure or a clogged nozzle. Low water pressure can be caused by a problem with the water supply line or a malfunctioning pump. Check the water supply valve to ensure it is fully open, and look for any kinks or blockages in the water line.
Water Pressure Test
Proper water pressure is essential for the spray arms to function effectively. You can perform a simple water pressure test using a pressure gauge. First, locate the water inlet valve on the dishwasher. This is usually where the water supply line connects to the dishwasher.
Attach the pressure gauge to the water inlet valve. Make sure the connection is secure. Then, turn on the water supply and start the dishwasher. The pressure gauge will display the water pressure. The ideal water pressure for a pass through dishwasher typically ranges between 20 - 60 psi (pounds per square inch).
If the water pressure is too low, it can cause weak spray patterns and poor cleaning. Check the water supply line for any restrictions or blockages. You may also need to check the water pump in the dishwasher. A faulty pump can fail to generate the necessary pressure.
On the other hand, if the water pressure is too high, it can cause excessive wear and tear on the spray arms and other components of the dishwasher. High water pressure can also lead to leaks. If you find that the water pressure is outside the recommended range, you may need to adjust the water pressure regulator.
Spray Pattern Analysis
The spray pattern of the water from the spray arms is another important aspect to check. A proper spray pattern ensures that all dishes are thoroughly cleaned. To analyze the spray pattern, place a few clean white plates in the dishwasher. Run the dishwasher on a short cycle.
After the cycle is complete, remove the plates and examine them for wet spots. The plates should be evenly wet, indicating that the water is being distributed evenly by the spray arms. If you notice dry spots on the plates, it means that the spray pattern is uneven. This could be due to a clogged nozzle, a bent spray arm, or a problem with the rotation.
You can also use a piece of cardboard or a sheet of paper. Place it in the dishwasher and run a short cycle. The water pattern on the cardboard or paper will give you a clear indication of the spray pattern. If the pattern is irregular, you'll need to address the underlying issue, such as cleaning the nozzles or straightening the spray arms.
Noise Check
While the dishwasher is running, listen for any unusual noises coming from the spray arms. A loud or grinding noise could indicate a mechanical problem. It could be that the bearings in the spray arm assembly are worn out, or there is a loose part rattling around.
If you hear a hissing sound, it could be a sign of a leak in the spray arm or the water supply line. Inspect the spray arms and the surrounding area for any signs of water leakage. A leak can not only reduce the effectiveness of the dishwasher but also cause damage to the surrounding area.
Regular Maintenance
To keep the spray arms in good working condition, regular maintenance is essential. In addition to the checks mentioned above, you should also perform routine cleaning and descaling.
Clean the spray arms at least once a month. Remove the spray arms from the dishwasher and soak them in a descaling solution. This will help remove any scale or limescale buildup. After soaking, rinse the spray arms thoroughly and reinstall them.
It's also a good idea to run a descaling cycle in the dishwasher every few months. This will help prevent scale buildup in the entire dishwasher system, including the spray arms, nozzles, and water lines.
As a pass through dishwasher supplier, we offer a range of high - quality dishwashers, including Single Tank Dishwasher, Single Tank Dishwasher Machine, and Rack Type Dishwasher. Our dishwashers are designed with durable spray arms and advanced cleaning technology to ensure optimal performance.
If you are in the market for a new pass through dishwasher or need assistance with maintaining your existing one, we are here to help. Contact us to discuss your requirements and explore our product range. Our team of experts can provide you with detailed information and guidance to make the right choice for your commercial kitchen.
References
- "Commercial Dishwasher Maintenance Guide", Industry Standards Publication
- "Dishwasher Troubleshooting Handbook", Professional Kitchen Equipment Manual
