Air Handler Equipment DDC Controllers | HVAC Control 5/5 (1)

Air Handler Equipment DDC Controllers

Air Handler Equipment DDC Controllers | HVAC Control

Air Handler Equipment DDC Controllers – These controllers will control an air handler once the wiring is completed. The panel is freshly mounted and waiting for the technician to run the piping and pull the wire from the control points. Other points, such as outside air, temperature sensors in piping or duct work, flow meters, actuators, or other control points can be terminated to these controllers and the data collected from those input points can be networked over the entire building automation system through the communication trunks. Included in this panel are: a terminal strip connection point for line voltage and control voltage, a transformer to step-down line voltage to the required control voltage of 24 volts which powers the controllers and a surge arrestor which is a requirement on many government jobs.

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Condensing Unit Frozen Wont Turn Off 5/5 (1)

Condensing Unit Frozen Wont Turn Off

What you can expect to learn from this article: this article is an answer from a question taken from our email by a visitor to High Performance HVAC. We often use the questions we get in the email as a guide to write articles. The topic is a condensing unit that will not turn off and it is freezing up. From my experience in the field and using my HVAC knowledge I offer the readers a list that could cause this problem. We hope it helps you.

What’s the possible problem with a frozen air conditioner condenser that won’t turn off except with the breaker?

Related Link: Here is a similar but different problem with a frozen air conditioner.

The Answer for frozen air conditioner condensing unit that won’t turn off –

There are 3 possible problems with this unit and will probably need the attention of an HVAC Technician for repair. Here’s the 3 possible problems:

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Air Conditioner Ductwork Leaks | HVAC Airflow No ratings yet.

Air Conditioner Ductwork Leaks

A good consideration when replacing the air conditioning system is the duct work.

Air Conditioner Ductwork Leaks
Red Arrow Shows a Duct Work Leak

Duct work seems to be the most ignored part of an HVAC system but is a very important consideration in this age of new technology and higher energy efficient equipment being developed and manufactured. You can have the most energy efficient engine but if its in an old 60 or 70’s model car your efficiency is going to suffer. The same is true with HVAC systems. You can have the most energy efficient compressor available on the market but if your duct work is leaky or your house or business is not properly insulated that high efficient system you just spent big dollars on is wasted money. For more insight on HVAC ductwork see the High Performance HVAC Ductwork Page.

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Air Handler Components 3 | HVAC Air Handling 5/5 (1)

Air Handler Components: Hot Water Coil Heat

Air Handler Components 3Air Handler Components – Hot water coils inside of air handler units combine a boiler system or a special capacity hot water heater and forced air to provide forced-air heating. The concept is simple and used a lot in commercial and some in residential. Commercial systems almost exclusively use a boiler to provide hot water to the hot water coil inside the air handler unit while the residential systems use mainly special capacity hot water heaters to provide hot water to the hot water coil inside the air handler unit. On a call for heat a pump is energized to begin the circulation of hot water from the heating source to the coil. The air handler unit blower motor energizes and air begins to move across the coil. Heat is exchanged from the hot water coil to the air and the air is delivered to its appropriate destination through the ductwork.

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Pricing New Air Conditioner | HVAC Heating and Cooling 5/5 (1)

5/5 (1) "> Pricing New Air Conditioner Cost Price for New Heat Pump

Pricing New Air Conditioner Cost Price for New Heat Pump

Pricing New Air Conditioner

We get emails on a regular basis asking us about prices for a new air conditioner, heat pump system, boilers, and other types of HVAC systems. This article addresses those questions and why it is nearly impossible to give anyone an estimate for a new system through email or forum without first looking at the house and other factors involved with giving someone a price.

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Air Conditioner Condensate Problems – Condensation Drain Plugged 5/5 (1)

Air Conditioner Condensate Problems

Labor time (approximate): 1 hour in some cases, several hours in others

Air Conditioner Condensate Problems – Condensation Drain Plugged
New Air Handler with Secondary Condensation Pan Under Unit and Showing the Float Switch

Air Conditioner Condensate Problems – It is important for air conditioning preventive maintenance to be performed on your system to avoid problems. Condensation water leaking near the air handling unit can be avoided with proper air conditioning repair and preventive maintenance. Normally this is a very simple problem that can be fixed in less than 30 minutes. Here is a list of what can cause water around the outside of the air conditioning air handler unit.

We have many other related articles. Please use the search feature to the right to help you find other related articles.

Air Conditioner Condensate Problems – Possible Causes

  • The black insulation (called Rubatex) has a tear in it or doesn’t cover the entire suction line. This line normally (in Air Conditioning air condition mode) operates below the dew point and will sweat if it is not insulated. It must have a sealed vapor barrier to be effective.

Nu-Calgon 4296-60 Pan-Treat Scum 200 Tablets to prevent drain clogs for condensate pans available here

Air Conditioner Condensate Problems – Condensation Drain Plugged

  • The insulation surrounding the air handler supply transition or ductwork is torn. The supply transition and duct can operate (under the right conditions) below the dew point and sweat. It is important that the transition have a vapor barrier around it. This scenario is especially true for those that have over sized units.

We have many other related articles. Please use the search feature to the right to help you find other related articles.

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Trane Air Handler Making Dust | HVAC Troubleshooting 5/5 (1)

Trane Air Handler Making Dust | HVAC Troubleshooting leaking duct work trane air handler
This is a brand new installation and the duct work was leaking. Older duct work definitely leaks and can cause a dusty environment

Trane Air Handler Making Dust | HVAC Troubleshooting

I would appreciate from some one in Trane organization that would please tell me why since installment and still 5 years later my house is nothing to a dust pit. I am not exaggerating. You can wipe dust blankets DAILY off my walls, floors, furniture. I have been since installation for someone to help me. My original installer put a filtering system “like used in coal mines” – did not help. I have had independent HVAC inspectors who cannot understand nor have any reasoning for the dust. One thing was that the original TRANE installer did not put sufficient air return duct in my house.

CAN SOMEONE HELP OR AT LEAST GIVE ME AN ADDRESS/TELEPHONE NUMBER WHERE I CAN CONTACT THE MAKER/OWNER OF TRANE?

L.E.

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HVAC Inspections and Commissioning – Building & Energy Codes 5/5 (1)

HVAC Inspections and Commissioning - Building & Energy CodesHVAC Inspections and Commissioning

How often have you heard someone complain about inspectors or code officials whose job it is to inspect mechanical, electrical, plumbing, and other trades work for safety and quality workmanship? One could argue that workmanship or even design can be horrible and the work pass a code inspection but chances are if the trades have any integrity they want the job to look good whether it is for the inspector or whether it is for pride and quality of work. It is not only good for the tradesman but it can make the inspection of the job better and smoother for everyone. That brings us to the purpose of this article. There are many homes and commercial buildings out there with HVAC equipment systems and duct work that has never been inspected for either safety and health or even quality workmanship and yes there are problems created by this lack of quality in the workmanship of the HVAC equipment installation and duct work and dare say safety, energy, and health issues. All three issues are increasingly important today.

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Magnehelic Duct Pressure Sensor – Magnehelic Duct Static Pressure No ratings yet.

Magnehelic Duct Pressure Sensor - Magnehelic Duct Static PressureThe magnehelic measures duct pressure inside of ductwork. It is important, for many reasons, to know the pressure inside of ductwork. This magnehelic measures the supply side pressure of the blower inside the air handler. The static pressure in this system is actually controlled by a static pressure transducer which is directly hooked up to a DDC controller that controls a variable frequency drive based on static pressure. The static pressure transducer is a solid state magnehelic and works in much the same way a magnehelic works except the transducer is digital and sends out a signal that registers the pressure it is reading. The magnehelic pictured is simply for visual display and reading the static pressure inside the air handler. It does not send out any signals.

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Duct Systems and Bad Ductwork No ratings yet.

Duct Systems and Bad DuctworkDuctwork is necessary to deliver the air throughout the HVAC system. It is important that the system has integrity with no leaks. Duct work is made of different materials. Duct systems also have different construction methods which hold the ductwork together.

Pictured above is an old ductwork system (which needs to be replaced) made of duct board, which is a rigid fiberglass board, and flex duct work. The duct board is cut to size from the duct work sizing requirements for tonnage and taped together with special duct tape. For the branches coming off the duct board trunk, metal collars are inserted into holes cut to size in the duct board. Flex ductwork is attached to the metal collars for the branch ductwork.

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Air Handler Components 5/5 (1)

Air Handler ComponentsThis article will take different types of air handlers and disassemble them part by part to give you a good description of each part and hopefully a better understand of the air handler in general. Most of the components associated with the air handler are in the air handler. However, there are a few components which are not in the air handler but associated with the air handler. There are some hot water and cold water coils which are not fixed into the air handler but downstream in the ductwork. There are also some gas and electric duct heaters which are mounted in the ductwork and completely reliant on the air handler for air flow. These systems will also be covered and hopefully this article will offer you a comprehensive look at the air handler, all its parts, and how it functions.

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Duct Temperature Sensor – Thermistor Temperature Sensing Device 5/5 (1)

Duct Temperature Sensor - Thermistor Temperature Sensing DeviceThe duct static temperature sensor measures air temperature in the ductwork. The solid state temperature sensing devices are commonly used in HVAC applications that are controlled by direct digital control or a modern building automation system. At the base of the box is a probe which sticks into the air stream of the ductwork. As the air passes over the probe the probe changes resistance. A small current which passes through the thermistor either increases or decreases depending on how the temperature changes. The controller reads this change and registers this temperature change and compares it to a table in the DDC program. The table has a sliding scale which matches a temperature to the set amount of current returning from the thermistor. This is how a thermistor is a reliable temperature sensing device. There are millions of these temperature sensors in use today and they reliably measure temperatures and cause DDC programs to react to the temperature these thermistors read. Thermistors are not only used in ductwork but also used in reading temperatures in pipes and mechanical equipment. Thermistors are not only used in HVAC application, computers use thermistors to read the temperature of your processor and turn the fan on to cool it when the temperature rises above a certain setpoint determined by the manufacturer. Chances are, there are several thermistors in your home and vehicle which read temperature to start an automatic process.

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HVAC Duct Work – Air Handling Unit Duct – Air Handler Duct Work 5/5 (1)

HVAC Duct Work - Air Handling Unit Duct - Air Handler Duct WorkHVAC Ductwork delivers the conditioned air to the spaces. The Air Handling Duct channels this conditioned air to spaces where it is needed and then a return duct channels the air back to the air handling unit duct for re-conditioning. The return ductwork has a negative pressure while the supply ductwork has a positive pressure. In commercial systems and tight residential homes it is necessary to add fresh air to this conditioned air so the air remains fresh and healthy for the occupants of the structure. This is required by the mechanical code and often this air comes through ductwork from the outside.

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Fan Maintenance and Energy Savings No ratings yet.

Fan Maintenance and Energy Savings
Proper HVAC Fan Maintenance and Control can save Energy Dollars

According to the Department of Energy fans consume nearly 80 billion kilowatts of energy per year. Optimizing how fans work functionally in mechanical applications can reduce energy use and save energy dollars for end users. Assuming the design engineer selected the proper fan and proper installation in well designed system what can a facility manager do to save energy dollars and increase performance by looking at the fan systems in their building(s)? To make a good evaluation you need to look at several different factors in fan operation.

  • Fan Control
  • Fan Performance
  • Installation
  • Ductwork
  • Fan Maintenance

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