Don’t Let Your Rooftop Unit (RTU) be Out of Sight and Out of Mind
Let it break down, and it will have a big impact on your employees and production. The saying “Out of sight, out of mind” can apply to a heating and cooling rooftop unit (RTU). It does its job day in and day out, without anyone paying much attention.
RTUs suffer from wear and tear over time and not only can they malfunction, but they eat up energy dollars due to poor performance.
To better serve our commercial clients, we offer the Abel Commercial Performance Program (APP). This is vital due to the obvious outside elements the units are subject to.
What do you Gain by Having the Abel Performance Program?
First is the comfort in knowing that when a situation arises, you are our top priority. It is quite possible that our Abel technician is already familiar with the history of your equipment and has made service calls at your place of business in the past.
You’ll enjoy peace of mind by having us inspect your RTU on a scheduled basis. Therefore, you can focus on your business management and leave the maintenance to us. You’ll receive:
- Priority Service
- Thorough onsite evaluations
- Two to Four seasonal inspections annually
- Courteous, expert technicians
- Preferred pricing, and more!
Maintaining the Casing Cabinet of Your Rooftop Unit
The exterior of your unit it exposed to the elements, including heat, freezing cold, hail, dust and dirt, and annual checkups should include an overall inspection.
Some RTU casings spill much of their expensive chilled air, or heated air, onto the roof, especially if the unit is poorly designed.
Panels that cover the RTU have many screws or fasteners and can be frustrating to access. In fact, some service technicians have been lazy about replacing them all, which causes openings. Even worse, improperly replaced screws can become stripped. We’ve even gone on calls where doors and panels have actually fallen off, leaving the unit exposed to the elements.
Snow or rain is blowing into the unit, energy is leaking, damage is being done to the electronics and components. This is costly for your business in utility and repair dollars.
At Abel we make sure our technicians have the proper tools to seal your unit/s.
Other Hazards to the Cabinet and Doors
A loss of 200 cubic feet per minute can escape from a 10-ton rooftop unit under high pressure if there is just a small crack, and this reduces cooling and airflow by about 5%, again wasting dollars per year in energy costs.
The last step in maintaining the outer casing is to check the system to measure the airflow insuring it is within the expected range of 350 to 400 cfm per ton of cooling capacity:
- Total static pressure drop measured across the fan.
- Shaft rotation measured with a tachometer.
- Flow from the manufacturer’s fan curve based on fan speed and pressure check is recommended.
If the airflow is not within the correct range, but the cabinet is properly sealed, a system investigation needs to be done to find out why. Ducts could be leaking or blocked, dampers may not be set or performing properly, or the fan may be malfunctioning.
Caring for the Condenser Coils
In a rooftop heating and cooling unit, the condenser coil is exposed to unfiltered outside air. Think of the buildup of dirt and dust. A dirty condenser causes the coil’s ability to exchange heat – and thus its cooling capacity will decrease. This causes the power consumption to skyrocket. Statistics say that a neglected condenser coil decreases in efficiency by 5% over 17 years and up to 30% by 20 years. In fact, harsh environments or high equipment loading (running equipment at, or near, capacity for long periods of time) can even further shorten these performance factors.
Cleaning the condenser coil takes time. Plus, before and after measurement tests need to be done to check the temperature differences across the coil
Fixing Refrigerant Leaks
Low refrigerant charge compromises the efficiency and capacity of the unit. Here are some routine maintenance needs:
- Pipes can be wiped down to keep clean.
- Rubber-gasketed brass cap connectors need to be tightened.
- Leaks need to be looked for.
- A search is made for vibrating or rubbing pipes that can separate and leak.
- Repairing a leaking coil only needs to be done once, and the next time, it should be replaced.
Several steps are required to repair a refrigerant leak, including nitrogen charging, refrigerant recovery, inspection with a leak detector, fixing the leak, a vacuum pull to meet EPA requirements, drying and recharging.
Again, these are things trained technicians need to perform, and can be gained through our Performance Program.
Prolong the life of your heating and cooling equipment through proper cleaning, check-ups and maintenance. Signing up for the APP (Abel Performance Program) will insure this gets done even though it may be ‘out of sight and out of mind’. This keeps your system in peak performance and insures early detection of problems, preventing down time for your business.
Give us a call at 952-472-COOL (2665) or Contact Us