Air conditioning and heating. Flashcards
- Adjusting the burner flame by turning the air shutter?
Right color - blue with a green core.
Flame is starved for air - a yellow.
Flame is getting too much air - blue with dark blue center.
- Tracking a problem of a gas burner?
- Make sure the pilot is lit.
- Clean the nozzle.
- Chack the thermocouple. If You find ash built up on the tip of the thermocouple , it needs to be cleaned or replaced.
- Ash build up is also an indication that the burners are in need of cleaning. Cleaning and reassembling the thermocouple is easier with the burners out of the furnace, so You might as well clean them at the same time.
- Lighting the pilot?
- Take access cover off the furnace and look for the gas control knob.
- Turn the knob until the arrow points at the word pilot. Push the knob for the button next to it down to start the flow of gas.
- Hold a long match or a long-nose butane lighter designed for the fireplace up to the pilot nozzle to light the pilot. Once the flame is lit, hold the knob down for about a minute, than release it. If the pilot stays lit turn the knob back to the On position. If it goes out try again. If the flame still goes out, the nozzle may be dirty.
- When can the thermocouple be the problem?
If the pilot flames mostly blue.
- What does indicate smoke for an oil furnace?
- A smoky furnace may be caused by a dirty nozzle or a dirty fan.
- Smoke, in particular, may indicate a cracked firebox and the presence of deadly carbon monoxide in your house.
- 2 systems ensures that the oil has ignited in furnace?
- An electric eye senses the flame.
2. A sensor in the chimney notes a rise in temperature.
- 2 parts of aquastat?
- The larger aquastat dial controls the set point - the tempe at which it will turn off the burner or pump.
- The smaooer dial controls the differential or number of degrees below the set point of which the burner or a regulator will come on.
- Testing the burner (set point) aquastat?
- Lower the setting less than 100F (38C) - the burner should go off.
- Return the burner aquastat to its original setting - the burner should go back on within 10 minutes.
- What shall you do if the existing well may not match the replacement aquastat?
- Make sure you have the correct aquastat.
2. Replace the well by following the manufacturers direction after you have drained boiler using pressure-relief valve.
- What is heat pump?
It heat your house in the winter because liquid refrigerant is pumped out doors, where it absorbs whatever heat is there, turning the refrigerant into a gas in the process.The refrigerant flows through a compressor which turns on into a liquid again, and the heat is released by this process as released through coils inside the house and distributed by the fan and duct system.
It cool Your house in the summer because the refrigerant absorbs heat inside the house and releases it outside.
To do this it has a reversing valve.
- How does direct-vent heater differ from vented one?
The vent on a direct-vent heater is a pipe within a pipe. The core pipe acts like a chimney: the outer section pulls fresh air from outside.
- What is the sealant of choice of the U.S. Department of Energy for Efficiency and durability for duct work?
Duct mastic, which is water-base, flexible sealant, that can be applied by brush, or with gloved hand.
- Name of outlet of ductwork?
Register boot.
- Name of the fitting that connects branch line to a plenum of a ductwork?
Starter collar.
- How shall You support a ductwork?
Nail plumber tape to the rafters every 4 feet and within 6 inches of any connections.
Flex duct does not snag more than1/2” per foot.
