Posts Tagged ‘Technical How Tos’
Fault codes are used on the Honeywell RM7800 series of boiler burner flame safeguard controls. These codes help the service technician identify problems that occur with the relay or the components that are wired to the relay.
Starting up a variable frequency drive can be as much an art as it is a science, and because a variable frequency drive can save so much money, you are going to see them on just about any project you bid. When you are estimating a job, how much do you add for the variable frequency drive? The price of a drive is easy to figure (the price is the price), so conventional wisdom would say go with the low price drive. But is that really the smart move?
Most of the pros I know say no. Read More
The Honeywell T775 Series stand alone controllers have now been on the market for several years. This diverse controller offers the technician a multitude of installation options on one small package.
This controller that stands 8 inches wide by 4 inches wide can be mounted anywhere within 1000 feet of its sensor location and be purchased as a standard enclosure or a NEMA 4X enclosure.
The T775 has an EEPROM that saves all values entered. The date and time values are retained for 24 hours after power loss. After power loss of more than 24 hours values may need to be reentered.
IMPORTANT: If a high limit set point is entered into a T775 controller this value is IRREVERSIBLE !!
Voltage: 24/120/240 note: cannot be used for DC voltages
Set Point Range: -40 to 248 F
T775A and B models: relay outputs from 1 SPDT to 4 SPDT (no analog outputs). Sensor inputs 1 to 2. Floating outputs 0-to 2
T775M models: Modulating with analog outputs of 2-10Vdc or 0-10 Vdc or 4-20 mA or Electronic Series 90. Relay outputs from 0 to 4 SPDT. 2 sensor inputs
T775R models: RESET OPTION.. 0 to 2 analog outputs 0 to 4 SPDT relay outputs. 0-2 floating outputs.
Sensors: update display and controller every 1 second
Accessories:
C7031D2003 5 inch immersion sensor with well
C7030B1009 wall mount room sensor
C7100D1001 12 inch Duct Averaging Temperature Sensor
When the need for a standalone controller presents itself think Honeywell and let Stromquist and Company help you select the right controller for your needs. Give us a call… Atlanta 1-800-241-9471 or Orlando 1-800-638-7828
The idea for this article came across my computer in the form of an e-mail sent to me by a fellow employee of Stromquist and Company with an attached photograph.
I know we all strive in our chosen industry to do things right with as much professionalism as our clients will afford us. I also realize at times even the best of service personnel will make installation mistakes. Some of these mistakes are quite humorous, some are quite expensive to fix, and some of these installations could be quite possibly dangerous.
Since the Control Trends website is duty bound to get, you our readers, the best information on new controls, controls installation, and new trends in the control industry would it not be appropriate to also show how not to install a product?
We at Control Trends will not mention anyone’s name or any company name we do this only as an insight to possible installation mistakes and how to avoid these mistakes.
This first installation is quite humorous to me and I call it “The Sunshine State Weather Protector” Read More
Why are Variable Frequency Drives like the Johnson Controls VS Series of Variable Frequency drives so popular? Well for one reason they can save a heck of a lot of money. According to Maintenance Resources a variable frequency drive can save up to 30% on energy costs. So what makes the Johnson VS series variable frequency drive so special? To begin with the size, with mechanical room space at a premium the compact size of the Johnson Controls VS series makes it a logical choice for retrofit applications
The unique bypass configuration is also a space saver. But the compact design is not even the best part… Read More
One of the really cool things about direct coupled actuators like those made by companies like Belimo, Honeywell, Johnson, Siemens, and Invensys TAC is that they can be usually be inter changed. Meaning if you have a 35 inch pound Belimo direct mount actuator, but there is not a Belimo 35 inch-pound direct mount actuator to be found in your city, you should be able to replace it with a Honeywell 35 inch pound direct mount actuator, or a Johnson 35 inch-pound direct mount actuator. Although each brand of actuator has it’s pros and cons they all for the most part close in quality and value. So if you have a job that has all Belimo and you need a replacement Belimo actuator but your local distributor does not have one on the shelf and you cannot wait for a Belimo actuator to be shipped then most likely you can find a Read More
Belimo is offering a really cool new linkage the Belimo ZG- JSL Belimo has created the quickest install designed with ease in mind. The ZG-JSL linkage is designed to facilitate the attachment of select Belimo actuators to a damper’s jackshaft. The unique open ended design allows the linkage to clamp on to any part of a jackshaft measuring from 1/2″ to 1.05″ in diameter.Saves time and cost
The Belimo ZG-JSL linkage simplifies typical installations and eliminates the difficulties where jackshaft bearings are hard to access. By improving the method of installing actuators onto jackshafts, the installer saves on installation time translating into a cost savings. The quicker the install, the sooner the installer can move on to the next project. Now with the Belimo ZG-JSL linkage all jackshaft installations will only take minutes!Ideal for tight spaces Read More
Stromquist & Company is a stocking distributor of all types of Variable Frequency Drives in Atlanta Georgia. Since we stock different brands of Variable Frequency Drives from the Honeywell Variable Frequency Drive to the Johnson Variable Frequency Drive to the Teco Westinghouse Variable Frequency Drive we are able to look for which product provides the best value for our customer when it comes to their Variable Frequency Drive needs. In this video you will see how to save money on your variable frequency drive project by determining if you need a by pass on your variable frequency drive project
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As this video shows in most cases you will not need a bypass and this can and will save you big dollars on your variable frequency drive projects. Variable Frequency Drives are a great way to save money by reducing the speed of motors and pumps when they do not need to run at full capacity. To get an idea of how much you can save check out this variable frequency drive energy calculator from Honeywell. You also should check out this video on how to set up you Variable Frequency Drive with a 0-10 volt input. For all your variable frequency drive needs in Georgia and Florida contact Stromquist & Company
Over the years I have been asked how to properly pipe a steam heat exchanger. I developed the drawing below to help answer this question. There are other piping additions that can be added according to your needs, and this drawing does not cover all the additions but should serve as a good workable starting point. A few points to remember…1. A vacuum breaker and/or vent should be installed…. 2. The steam trap should be properly sized for the amount of the pounds per hour steam capacity of the heat exchanger, and the trap should be sized for the pressure at the trap not for the inlet pressure of the control valve…3. A properly sized relief valve must be installed on the hot water outlet side to protect the heat exchanger from possible damage due to volumetric expansion.
I hope this answers some questions you may have. If you need more answers please call Stromquist and Company at 1-800-241-9471, and we would be happy to finalize an answer for you.
Even with all the great new technology in HVAC controls, there are still many pneumatic buildings out there. If you happen to be someone who has to work on pneumatic controls, you know it can be frustrating when you have a problem with the system. Here’s a good troubleshooting procedure from Jerry Condiff, the instructor who teaches a great pneumatics class for us here at Stromquist every year. Jerry has been in the HVAC controls field for over 30 years and really knows pneumatics.
Pneumatics Troubleshooting Procedure
Start at the thermostat or controller. Check to see if the thermostat will put out a high pressure by turning the set point to its minimum setting. The pressure should be high on the output gauge. If not, try adjusting the calibration screw.
If no air noise is distinguished, check to see if air is present in the supply line into the thermostat (this will require removing the stat from the mounting bracket). If supply air is present but there is no air bleed noise or output pressure, the restrictor is plugged or the nozzle at the bleed port is dirty. Check and clean the nozzle or clean out the restrictor.
If there is no pressure output but air bleed noise is present, check for an air leak behind the mounting bracket. Check the air hoses that are connected to the mounting base for deterioration. Check Honeywell stats for broken plastic air nipples in the back of the mounting base.
If no air leaks are found, plug the branch line of the stat with a jumper hose connected from the supply line to the main or supply to the stat. If pressure builds on the branch gauge, the branch line of the controlled device (valve, damper or pressure switch) has a leak. You may also make up a tool consisting of two 5/32 lines and a barbed gauge tee and a 30# pressure gauge. Connect one end of the hose to supply and the other to the branch port on the mounting base. If you do not read any pressure on the gauge, the branch line has a leak. If pressure builds, the stat is bad and will need to be replaced. Use a squeeze bulb and gauge to check controlled device diaphragm for leaks. If no leaks are present, the branch line hose has a leak and needs to be replaced.
This procedure may not cover every potential issue you run into with your pneumatic system, but it should at least be a good start, and I hope you find it helpful. Happy troubleshooting!
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