What is the first thing to do when a new system has been assembled (built up), and is ready for testing? Pressurize with an inert gas and leak check . You just studied 25 terms!
When first inspecting a hermetic system known to be leaking you should look for?
| Question Answer | 1. When first inspecting hermetic system known to be leaking, you should look for, D. Traces of oil | 2. Which part of a belt driven non-hermetic compressor is most likely to leak if the compressor is not been used for several months, B. Rotating shaft seal. |
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What is the first thing to do when a new system has been assembled?
When a new system has been assembled, the first thing to do is. evacuate the system . evacuate the system. pressurize the system with an inert gas and leak check.
When added to an appliance that contains 50 or more pounds of an ozone depleting refrigerant triggers the requirement to calculate the leak rate?
7) Requires owners/operators to submit reports to the EPA if any appliance containing 50 pounds or more of refrigerant leaks 125% or more of its full charge within one calendar year . The report must document efforts to identify leaks and repair the appliance. 8) Imposes new sales restrictions for refrigerants.
Which of the following should be replaced if a system is open for servicing?
#21. When a unit is opened for servicing, the ________ should always be replaced. When a unit is opened for servicing, the filter-drier should always be replaced.
When should an appliance not be evacuated?
The reference manual states “Appliances do not need to be evacuated all the way to the prescribed level if the appliance is being disposed of ”.
What can happen when using a large vacuum pump to evacuate a system?
When evacuating a system, the use of a large vacuum pump could what? Cause trapped water to freeze . ... Prior to replacing the condenser coil in a high pressure system, the refrigerant was recovered and stored in a refillable cylinder.
When a system is in deep vacuum you should never?
When a system is in deep vacuum; 1. Never add refrigerant to the system .
What parts of the system should be drained of water before recovering refrigerant?
system water pumps should be on, the recovery compressor should be on, and the recovery condenser water should be off. C) system water pumps, the recovery compressor, and the recovery condenser water should all be on.
Where must you connect a hose in order to recover liquid?
You need to connect a hose from the low side of the manifold to the high side of the recovery unit .
What is the best method to determine a chillers normal charge?
What is the best method to determine a chiller's normal charge for leak rate calculations? Use the charge stated on the equipment nameplate . Approximately how much refrigerant vapor is left in an average 350-ton R-123 chiller at 0 psig once all the R-123 liquid has been removed?
How long do owners or operators of an appliance with a full charge of 50 or more pounds?
Question #7: How long must owners and operators of low-pressure chillers using R11 refrigerant keep records of leak inspections, initial verification, and follow-up verification tests?. As per the EPA, it is compulsory to keep the records for any appliance having 50 or more pounds refrigerant for a minimum of 3 years .
How long must an HVAC servicing company keep records for each dispose appliance with a charge between 5 and 50 pounds?
Technicians and HVAC servicing companies should also keep records of appliances having refrigerant amounts between 5 and 50 pounds when disposing of them. The records of disposal must be kept for a minimum of 3 years .
Where is the purge unit located in a low-pressure system?
Where is the purge unit located in a low-pressure system? The top of the condenser . If a strong odor is detected during the recovery process, a compressor burn-out may have occurred.
What must be checked before starting a recovery process?
Before beginning recovery, check the positions of all service valves and the oil level of the recovery unit . Recover the refrigerant into the system's own receiver or storage tank if it has one. It is most efficient to recover liquid first (from the system's liquid line), then vapor.
How can you speed up the removal of refrigerant charge from a system?
Removal of the refrigerant charge from a system can be conducted more quickly by ; packing the recovery vessel in ice . When first inspecting a hermetic system known to be leaking, you should look for; traces of oil.
