Who must certify recovery equipment used during maintenance service or repair of small appliances that use CFCS?
17 Cards in this Set
| EPA regulations include which of the following in the definition of small appliances | Both A and B |
|---|---|
| recovery equipment used during maintenance service or repair of small appliances must be certified by the EPA approved laboratory is manufactured after | November 15th 1993 |
When recovery is first started at what phase?
TYPE II
| Question | Answer |
|---|---|
| 6. When recovery is first started, at what phase is the refrigerant removed to save recovery time, | C. Liquid phase |
| 7. Where must you connect the hose in order to recover liquid refrigerant, | C. Liquid line |
Which safety precautions should be adhered to for low pressure systems?
Which of the following safety precautions should be adhered to for low pressure systems? -Do not syphon refrigerant by mouth. -Avoid spilling refrigerant on the skin. -Use gloves and safety goggles when working with liquid refrigerant.
Where is refrigerant added to a low pressure system during the charging process?
Where is refrigerant added to a low-pressure system during the charging process? The lowest access point on the system such as the evaporator charging valve. If a strong odor is detected during the recovery process, a compressor burn-out may have occurred.
What is a low pressure refrigeration system?
Low-pressure chillers are typically centrifugal chiller type refrigeration systems operating under a vacuum in the evaporator section of the system. The condenser and compressor sections could be at a slightly negative pressure or up to 15 psig positive pressure.
How does a low pressure switch work?
A low-pressure switch is connected to the suction, or “low” side of the system to sense suction pressure. When the pressure in the system exceeds the high pressure switch setting, the switch will open circuit the compressor clutch and the compressor will stop circulating refrigerant.
How do you reset a low pressure switch?
How to Reset Your Low Pressure Cut-off Switch
- Turn off all water faucets and water using appliances.
- Hold the lever at a 30-degree angle.
- Watch the pressure gauge next to the tank – it should start to rise at a steady rate.
- If the water pressure starts to rise, hold the lever in the same spot until the pressure exceeds 25 psi.
How do I know if my low pressure switch is bad?
Symptoms of a Bad or Failing AC Pressure Switch
- AC system cutting on and off rapidly. Repeatedly cycling on and off is part of the normal operation of an AC system.
- Unable to cool the car. If either of the AC pressure switches fails, then the system will have a difficult time maintaining the pressure required to function properly.
- Compressor not coming on.
Can you bypass low pressure switch on AC?
Under normal conditions the pressure switch doesn’t cycle the compressor. In your case, if your system is working properly, you should be able to bypass the switch temporarily until you can replace it.
What causes low pressure switch trip?
Things that can cause the low-pressure switch to trip include: Low refrigerant charge because of a refrigerant leak. Blower motor failure in the air handler. Plugged evaporator coils or a blockage of air flow.
What is the purpose of a low pressure switch?
The low pressure switch monitors the refrigeration system for a loss of refrigerant charge, and may also be helpful in stopping the evaporator (indoor) coil from freezing up due to a dirty filter or low airflow over the coil.
How do I test my AC low pressure switch?
How to Test a HVAC Pressure Switch
- Inspect the terminals on the pressure switch. If any of them are burnt or badly discolored, then you should replace the switch.
- Set the voltmeter or multimeter to display AC volts.
- Touch one of the probes from the meter to either one of the terminals on the pressure switch.
- Check the voltage reading on the meter.
Where is the low pressure switch located?
The low side service valve is located in the line that runs from the compressor through the evaporator (firewall) and up to the condensor on the low pressure (suction) side of the system.
What happens if refrigerant pressure is too low?
Low refrigerant means low pressure and low pressure means low temperatures that will eventually freeze something called an evaporator coil. When the evaporator coil freezes, cold liquid refrigerant flows through the refrigerant line, causing the surrounding moisture in the air to freeze.
How do you reset a high pressure switch?
A manual-reset high-pressure switch needs to have an operator manually press a reset button in order to restart the compressor. They are also available with either an adjustable cut-out setting that could be adjusted by a technician, or fixed settings, which cannot be adjusted by a technician.
Where is the low pressure side of my home AC?
How to Locate the High and Low Sides on a Home AC Compressor
- Open your A/C unit’s access panel by either removing the screws holding it in place with a screwdriver or using your hands to open it, depending on the unit type.
- The low side, or suction line, will be the line connected to the compressor from the top or higher position.
What color is the low side of an AC system?
blue
What is the low side of a refrigeration system?
The low side of a refrigeration system usually houses the evaporator, suction line, and any accessory components located within the suction line. Accessory components can include evaporator pressure regulator valves, suction filters and driers, crankcase pressure regulator valves, and suction accumulators.