Monthly Archives: October 2008

ACCA Releases “Understanding Electricity”

ACCA Releases “Understanding Electricity”
Computer Video Training in Basic HVAC Electricity

The Air Conditioning Contractors of America (ACCA), the largest organization of heating, ventilation, air conditioning, and refrigeration (HVACR) contractors, has released the latest in its popular series of computer-based training packages known as “HVAC Essentials.”

The latest package is entitled “Understanding Electricity” and explains the basic information necessary to properly understand, install and service the electrical circuits commonly associated with HVAC equipment.

 

Understanding Electricity” is a 5-CD set, each part taking 1-2 hours, allowing users to move at their own pace as they learn this vital part of HVAC installation and servicing. Taught by presenter Jack Rise, each video session is presented in plain English, with lots of real-world examples that make the necessary principles easy to learn and apply. Each CD also contains appropriate handout materials.

A brief excerpt of the training may be viewed online at www.acca.org/hvacessentials/. (Excerpts are also available there for the other packages in the “HVAC Essentials” series.)

The five CDs in “Understanding Electricity” are:

  • Part 1 – Atoms, Current Flow & Circuits
  • Part 2 – Relays, Contactors & Motors
  • Part 3 – Ohm’s Law, Series and Parallel Circuits, & Meters
  • Part 4 – Schematic Diagrams, Electrical Service Panels, & Compressors
  • Part 5 – Power Distribution and Electrical Safety

The “HVAC Essentials” CD sets comprise a full-featured training library that is available whenever you are. Other packages in the “HVAC Essentials” series include:

  • Understanding Manual J (Residential Load Calculation)
  • Understanding Manual D (Residential Duct Design)
  • Understanding Manual N (Light Commercial Load Calculation)
  • Understanding Manual Q (Low Pressure, Low Velocity Duct Design)
  • Understanding Section 608 (Refrigerant Handling)

To learn more information, view excerpts, and purchase any of these packages, visit www.acca.org/hvacessentials.  They may also be purchased by phone at 888-290-2220.

For over forty years, ACCA has served the nationwide educational, policy, and technical interests of the small businesses who design, install, and maintain indoor environmental systems. For more information, visit www.acca.org.

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To learn more about Jackson Systems visit www.jacksonsystems.com

Honeywell MultiPRO and SuitePRO thermostat

Jackson Systems is looking into expanding their commercial thermostat product line.  In order to make sure we have the right mix of thermostats for our customer needs, please take just a few moments to fill out this extremely short survey.

The kinds of products you prefer are very important to us and we want to help you in every way we can.

Thank you for your time in helping us better serve you.  Please click here to begin this survey.

To learn more about Jackson Systems visit www.jacksonsystems.com.

Honeywell SuitePRO and MultiPRO thermostats

Quick notes about the new Honeywell SuitePRO and MultiPRO thermostats

These stats are primary used in multi-residences such as condos, townhomes, senior-living facilities, hotels and motels.  The main equipment these thermostats are used on is fan coil systems and PTAC units.

The SuitePRO comes in 3 different Models.

TB6575A1000

TB6575B1000

TB8575A1000

The TB6575A1000 applications are:

2 or 4 pipe fan coil, Heat/Cool manual/auto changeover, 3 speed fan, 120 – 240VAC

The TB6575B1000 applications are:

2 pipe fan coil, Heat/Cool manual/auto changeover, 3 speed fan, 120 – 240 VAC

The TB875A1000 applications are:

2 or 4 pipe fan coil, Heat/Cool, manual/auto changeover, 3 speed fan 24VAC

These are the differences of the 3 stats:

The TB875A1000 is the only one that does 24VAC

The difference between the TB6575A and the TB6575B is the number of pipes.  The TB6575A does both 2 and 4 pipe while the TB6575B only does 2 pipes. 

The MultiPRO thermostat

There is one MultiPro stat: TB7110A1000

The TB7110A1000 24Vac 1H/1C Conventional, 2H/1C Heat Pump, 2H/1C 2 speed PTAC, 2 or 4 pipe 3 speed fan coil, remote sensing, programmable or non-programmable.

The difference between the MulitPRO and the SuitePRO.

The MultiPRO is Universal and can use single speed ,2 speed, or 3 speed fan, on single or multistage equipment.  The SuitePRO is used for Fan Coil and is 3 speed fan only with single stage equipment.  The multi PRO is 24V only while the SuitePRO comes in either 24V or line voltage.

To learn more about Jackson Systems visit www.jacksonsystems.com

Troubleshooting Zone Control

By: Mike Holscher, Inside Sales Engineer at Jackson Systems, LLC

Although forced air zone control systems vary from one manufacturer to another, the principle of zoning is basically the same. A residential or light commercial zone control system uses multiple thermostats and motorized or pneumatic zone dampers along with a logic panel to control the air distribution from a single HVAC unit to individual zones. In most applications, a bypass damper is also incorporated to maintain the system static pressure as zone dampers open and close.

Typical Zoning System Layout

With proper test, check and start-up procedures, modern zone control systems require very little, if any, maintenance after the original installation. Unfortunately, not every system is thoroughly tested to assure that everything is functioning properly which usually leads to a user complaint after the fact.

If the service contractor is not the original installer of the zoning system, it is always a good practice to find out from the user what brand system requires troubleshooting as the original manufacturer can provide technical assistance, along with installation and operation manuals that will make the service technicians’ job a lot easier in diagnosing the problem. The zone thermostat on the wall is not necessarily the zone control brand. The user needs to confirm the manufacture of the logic panel which could be located on or near the HVAC unit, in a closet, garage or even in an attic. If they simply don’t know, or locating the panel is too inconvenient, then the technician is making a blind service call. This is where basic understanding of zone control systems can be a real plus in the troubleshooting process.

Before heading for the jobsite, the service technician should make sure to have the following in the tool kit:
Quality multi-meter
Digital thermometer
Small screwdriver that fits electronic terminal blocks
Flashlight
18-gauge thermostat jumper wires

Where to start:

Most user complaints come from not being comfortable. This could be related to multitude of things including zone thermostats, zone dampers, the logic panel or even the HVAC equipment. A good start is to find out if the problem is isolated to one zone or multiple zones. If it’s a single zone, the diagnostic process becomes less involved.  Typically a single zone problem can be traced back to a malfunctioning zone damper or zone thermostat.  Testing of the zone damper to see if it is opening and closing properly and replacing any defective parts on the zone damper can solve many problems.

Checking Zone Dampers for Proper Operation

Testing of the thermostat to see if it is operating normally by having it call for conditioned air would be the second troubleshooting step on single zone problems.  This can be accomplished by confirming that the zone control panel is receiving the correct corresponding signals from the thermostat. A jumper wire can come in handy here.  Disconnecting the thermostats from the logic panel and placing a jumper wire between the R terminal and the W terminal on one zone terminal can simulate a call for heat.  This can help confirm that the logic panel and the HVAC equipment are working properly.  Usually if a contractor can troubleshoot a thermostat that does not have zoning, they can troubleshoot a thermostat that does have zoning.
Multiple zone problems can be more complicated but the troubleshooting steps are similar to a single zone problem.  Isolating zone dampers and zone thermostats and testing each component individually should help you find the problem.
Troubleshooting the logic panel can more involved than troubleshooting individual zones.  The logic panel is where the thermostats, dampers and the HVAC equipment are tied together.

Trouble shooting Zone Panel

Testing the logic panel can be accomplished by using a quality multi-meter and checking for voltage or continuity at certain terminals on the panel.  If you are getting an input signal from the thermostat but you are not getting an output signal to the HVAC equipment the logic panel might need replaced.  Any and all fuses on the logic panel should also be checked to make sure they are in proper working condition.  It is best to have a separate dedicated transformer powering the logic panel in order to isolate the zone control system from the HVAC equipment.  Many logic panels have built in LED’s to help troubleshoot the zoning system.  These LED’s can tell the contractor when dampers are open or closed, when cooling or heating is being called for by the thermostat or when the fan is being called for.  The use of these LED’s can provide invaluable assistance in diagnosing zoning problems.
When testing any component, care is needed to make sure all wires are landed securely and that there is no break in any of the wiring.  If pneumatic tubes are used, make sure there are no leaks and the pump is functionally properly.
If the zone thermostats, zone dampers, and the logic panel seem to be in working order, then attention now needs to be focused on the HVAC equipment.  Disconnecting the R wire and the W wire from the logic panel and wiring these two together should bring on the equipment.  Testing of the HVAC equipment can follow the same testing procedures as if there was not zone control.  Sub-cooling, super-heat, temperature, and pressure readings should all be taken.
Forced air zone control technology has taken tremendous steps in the last decade.  Ease of installation, reliability of parts, and technical support from manufactures, are all areas that have improved that have allowed zone control to grow both in residential and light commercial markets.  Troubleshooting zone control systems is also an area that is seeing a higher level of expertise among contractors.  This expertise allows the end user to have a higher level of comfort than has been enjoyed in the past. 

Honeywell TrueSteam Remote Mounting Kit

With winter approaching contractors will be changing focus from dehumidification to humidification.  Honeywell’s TrueSteam humidifiers operate independently of the HVAC equipment and provides whole house humidification.  The TrueSteam comes in 3 different sizes with different humidification control for a total of 8 different part numbers to choose from.  These 8 distinct part numbers can each take a remote mounting kit.

The 50024917-001 is a 10’ remote mounting kit.  The 50024917-002 is a 20’ remote mounting kit.  The six gallon TrueSteam can only have the 10’ remote mounting kit, while the 9 and 12 gallon TrueSteams can have either the 10’ or 20’ remote mounting kit.  These kits are used for mounting the TrueSteams to a location other than on the supply duct.  Always ensure an uphill flow when installing the remote hose.  If the hose cannot be installed with an upward pitch of 2 2in. /ft., a drip tee must be installed.  The remote hose must be supported to prevent sagging or low spots.  For the drain, allow a continuous down slope to the drain.  Insulating the remote hose in unconditioned spaces will sustain efficiency better than not insulating the hose.

Remote_hose_kit_for_the_truesteam_4   

Honeywell &8150 Air Ventilation System

The control operates a fresh air intake damper and, when necessary, activates the main HVAC blower to efficiently meet ASHRAE ventilation rates.

A fresh air duct and damper must be installed between the outdoors and the return side of the HVAC equipment.  The W8150 control will be mounted near the HVAC system and wired between the thermostat and the fan control.

Today’s energy-efficient homes do a great job of keeping conditioned air in. The downside is that reduced ventilation and air exchange with the outside can result in poor indoor air quality and possible health problems. Even air systems that are designed with fresh air intake do not provide ventilation or exhaust when they are not running. Economical and affordable ventilation control systems are ideal for use with exhaust fans, air handlers, heat recovery ventilators, intermittent whole-house exhaust systems, or anywhere specific ventilation rates are desired. Mixing the house air can increase energy efficiency, reduce moisture condensation problems, and increase indoor air quality.

Typically, the damper is installed in a 6" duct that runs from the outdoors to the return side of the air handler on the central heating and cooling system. The control opens the damper to introduce fresh air when the air handler operates to satisfy a space heating or cooling call from the thermostat. Once the damper has been open the appropriate length of time to satisfy the calculated requirement for ventilation, the damper will no longer open during regular heating or cooling periods. Alternatively, if there have not been sufficient heating or cooling calls to introduce adequate fresh air, the control will open the damper and activate the air handler. The control resets and begins counting every 24 hours.

Features and Benefits
-Microcontroller optimizes the air delivery schedule to make efficient use of normal HVAC run times.

-Test mode that includes immediate feedback to installer to confirm that air delivery requirements of selected ventilation standard are being met.

-Economical supply-only ventilation; works with forced air system.

Specifications

Y8150 includes:
-W8150A Fresh Air ventilation Control
-EARD6 Fresh air damper (6” diameter, Powered Open/Spring Closed)
-AT120B Transformer
-Mounting hardware for control
-Homeowner information label
Power Supply: 24Vac
Power consummation 3.5VA
Input Setting Ranges:
Bedrooms 2-5
Area: 1000-4600 sq ft.
Vent Airflow 40-160 cfm

Installation
-Installing a damper directly to the return duct may be convenient to support the damper and reduce ducting.

W8150 A Control
-Ventilation Limit
This setting determines the maximum amount of time that the fan runs for ventilation.  Ventilation control reads the new dial setting only when test button is pushed or power is cycled.
Setting the control
Set the number of bedrooms dial
Set the sq ft area dial
Set the cfm airflow dial
For homes with multiple systems, Honeywell recommends a ventilation control and fresh air intake for each system.

The Honeywell Y8150 A is used in conjunction with central HVAC fan systems. It consists of a motorized damper, a transformer, and control that contains an "intelligent algorithm". The algorithm calculates the amount of ventilation needed based on particular settings for the home. The installer enters the square footage of the home, the number of bedrooms, and the amount of outdoor air being introduced when the air handler operates and the damper is open. The latter value is obtained by directly measuring the volume of air moving through the duct with a tool such as a pilot tube. The control then opens the motorized damper the appropriate amount of time to achieve the required volume of fresh air for the home.

To learn more about Jackson Systems visit www.jacksonsystems.com.

Jackson Systems’ expands product line to include technology in gas detection

Jackson Systems has expanded their product line to include technology in gas detection.  Some of the more common air quality hazards that need monitoring include carbon dioxide (CO2), carbon monoxide (CO), NO2, O2, CL2, and refrigerants.  Whether you require a fully engineered gas detection network or a more modest detection solution, we can customize a solution to meet your needs.  Gas detection can be a critical component of ensuring clean air in parking garages, mechanical rooms, computer server rooms, or in refrigerant systems. 

One common gas detection application is monitoring CO in parking garages.  These monitoring systems can activate ventilation through relays on multiple levels and at varying speeds depending on the concentration of gas measured.  Cars produce carbon monoxide (CO) as a result of incomplete combustion.  When a large number of vehicles are within an enclosed area such as a parking garage, the concentrations of CO can reach harmful levels.  Large reductions in energy and maintenance costs can be had by activating fans only when CO levels reach a certain hazardous level instead of running them all the time.

A gas detection system typically includes a main control panel, sensors, and audible/visual alarm devices that can be linked to a controller or a building automation system (BAS).   The system can be either hardwired or wireless.  Many people think that wireless mesh networking is the wave of the future.

To learn more about Jackson Systems visit www.jacksonsystems.com.

Join us at the National HVACR Service Managers Forum

Join Jackson Systems at the National HVACR Service Managers Forum October 9 & 10, 2008 at the Doubletree Hotel Houston in Downtown Houston, Texas.

Service managers are key to contracting success. Get a leg up on your competition at the Service Managers Forum!

The First Annual National HVACR Service Managers Forum is the first national educational program designed exclusively for Service Managers – the people who run a service department and make a big difference in contracting success.

To learn more about Jackson Systems visit www.jacksonsystems.com.