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Hvac Purging
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Your gas furnace is not working and you think that the pressure switch is bad. Here are some things to check and the steps to replace it. Replacing is not very difficult at all, in fact it is one of the easiest thing that you can replace yourself.
Your gas furnace purge blower runs and never shuts off but your furnace is not producing any heat. Or your igniter will glow, light the burners and then the furnace will shut right back down and try to recycle all over again. Either one of these conditions are common if the switch is going bad or has failed.
You can check the switch by placing a jumper wire across the wires going to the switch once the purge blower has started. If the burner lights and stays lit the pressure switch is probably your problem. Could be a weak blower, but I would try the pressure switch first; it is much less expensive to replace.
Once you isolate that this switch is faulty, then you can change it. This is very simple. For most furnaces the wiring is low voltage, so the risk of shock is minimal. You should still turn off the power to be safe. Remove the screws that secure the switch and then just switch the two wires over to the new switch and secure the screws again.
That's all there is too it a very simple operation.
Turn the power back on to the furnace. Re-fire the furnace and check the operation of the unit. It takes a while for the unit to cycle through the lighting process but you should have a furnace that now heats your house just fine.
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Direct-Fired Gas Industrial Makeup Air Units
NISCO Co. ia an engineering representative and developer of various types of gas-fired air makeup units for industrial building ventilation.
Gas-Fired Pressurization Units move large quantities of air at low temperature differentials (usually 50° or less), which is a strategy to minimize temperature stratification in the large spaces they are employed to heat. The equipment is typically mounted on the roof of the facility or at grade on elevated supports to ensure that the supply air is delivered high. The high air delivery allows for a longer “throw” of the air, thereby requiring less equipment to cover the required floor area. The most common fuel is natural gas, however, units can be converted to burn propane. There are two primary categories of gas-fired AHUs: indirect-fired and direct-fired.
Indirect-fired units burn the fuel and air mixture inside of a heat exchanger while the air traveling to the space passes over the outside of the heat exchanger. In this design, the products of combustion travel through a vent to the outside of the building.
Direct-fired units utilize air that will be sent to the heated space for combustion without use of a heat exchanger. The products of combustion are mixed directly with large volumes of outdoor air. Such mixing is considered safe because of the high dilution ratio.
In addition, thorough burning of the natural gas takes place so that no harmful products of combustion enter the airstream. One product of combustion is water vapor, which can be problematic with very tight building construction due to the potential for condensation in colder climates. For tight buildings, it is best to consider the use of indirect-fired equipment. There are several common configurations of direct-fired units.
The 80/20 design can vary the quantity of outside air from 100% down to 20%. The burner has a high turndown ratio and only outside air should be drawn across the burner. The discharge air volume is fixed and the quantity of outside air can be adjusted to maintain building pressurization. The makeup air unit configuration is ideal for supplying large quantities of replacement air for facility exhaust systems. Such systems can include paint spray booths and other industrial exhaust applications. These units supply a fixed amount of 100% outside air. Air Recirculation units recirculate a fixed 80% of the air while bringing in 20% outside air that passes over the burner. They supply a minimum amount of ventilation to spaces that do not require large quantities of outside air to maintain building pressurization.
Variable Air Volume VAV units have a varying supply air volume and work similar to the 80/20 design, however, the recirculated air passes through a bypass section instead of through the facility. This type of unit is used in applications where building pressurization is desired and where contaminants located in the space cannot be recirculated.
Facilities that have indoor vehicle operation frequently accumulate carbon monoxide and associated noxious fumes. For such instances, a ventilation sequence can be instituted to limit this potentially harmful buildup. The pressurization units for these buildings could be fitted with a carbon monoxide detector with an initial setpoint of, for example, 50 ppm that would trigger an alarm and energize a time-delay relay.
If the condition still exists after, say, five minutes, then the return air damper would modulate closed and the outside air damper would modulate to the 100% open position. A second setpoint of 100 ppm would initiate an alarm and eventually de-energize the burner. The dampers would then be positioned to enable the exhaust mode. After the carbon monoxide returns to a safe level, the sensor could reset the unit to normal operation.
In addition to emergency ventilation to purge carbon monoxide, the pressurization unit can be used to provide a source of ventilation during warm and hot months of the year. A reverse acting thermostat would modulate the outside air and return air dampers to bring in more outside air to maintain the indoor setpoint. These units can also be fitted with either chilled water or DX cooling coils to provide tempered or conditioned air to the space during the summer.
Direct-fired pressurization units are approximately 93% efficient, with much of the available energy in the burned natural gas being delivered to the space in the form of heat. The supply airstream absorbs the heat that would be normally lost through a flue or vent pipe as in the indirect-fired configuration.
A feature of this type of equipment that is especially important in cold climates is its ability to keep the building slightly pressurized to typically at 0.01 in. wc. This reduces the infiltration of cold air, and when overhead doors are opened, the outside air dampers are modulated open to admit more air to maintain this level of pressurization. This feature also acts as virtual ductwork to distribute air where it needs to go: toward cracks or areas with open doors.
Direct-fired pressurization equipment is capable of delivering plenty of ventilation to a facility when it is configured as the 80/20 system described previously. Infrared systems, however, may need to be supplemented with a separate ventilation system. With certain classes of facilities, the infrared system would not require additional equipment for ventilation, since large structures with many doors would provide enough natural ventilation through leakage.
Gas-fired pressurization systems each offer good solutions to heating large structures such as warehouses, distribution centers, aircraft hangers, and manufacturing facilities. Situations that require significant ventilation favor pressurization air handlers as do facilities that generate dust, mists, and other contaminants. Cleaner environments with less intensive ventilation needs would do well to go with the infrared radiant heating approach. In very cold climates, it might be beneficial to go with a hybrid solution using radiant heat at the perimeter as the primary heating source and placing pressurization units at the center of the facility for ventilation and for pressurization when doors are open.
Additional information can be found at the NISCO web site http://nisco.net/airhandler.html.
Oleg Tchechel
Industrial Air Make-Up Systems Designer
NISCO Co.
http://nisco.net/hvac.html
http://nisco.net/news.html
About the Author
Oleg Tchechel
Developer of Industrial Ventilation Equipment
NISCO Fan Co.
http://www.nisco.net/custserv.html
http://www.nisco.net/inquiry.html
My hot water heating systems sounds like water is "burbling" through it .. what gives?
Now that heating system is here, when my system turns on, I hear water running throught the pipes. The HVAC guys have been here to bleed the system (they did it 3 times yesteraday morning) and it still sounds like water is rushing through the pipes ... its not constant though ...seems worse for the 10-20 seconds after the circulator kicks in. I have a relatively new system with an automatic fill and an automatic air purge. At this point, I'm wondering if I should just let it run a while .. we do get good heat ... maybe it takes a while for the system to "stabilize" after being off for 1/2 year? Its driving me crazy ---sounds like a leaky toilet at times.
Sounds like you still have some air in the system, as long as you are getting heat, let run and it should take the air out.
Atomizing Systems Silver Winner in the Air Conditioning - Heating - Refrigeration - HVACR ...
The NEWS' award winners in the Miscellaneous category of the sixth annual Dealer Design Awards make technicians' jobs easier, which can translate into time and money saved on the jobsite. The gold winner, Western Enterprises' HVAC VN Series, makes purging and post-brazing leak checking simple, which can save money for the business. The FF-609, by Atomizing Systems Inc., is easy for a technician ...
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