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| What type of equipment can be worked on with Type III certification? |
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| As of... the sale of CFC and HCFC refrigerants is restricted to certified technicians. |
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| Because a low‐pressure system operates below atmospheric pressure (in a vacuum), leaks in the gaskets or fittings will cause... |
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Definition
| air and moisture to enter the system. |
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Term
| The most efficient method of leak checking a charged low-pressure refrigeration unit is to |
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Definition
| pressurize the system by the use of controlled hot water or heater blankets |
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Term
| When pressurizing a system, do not exceed |
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Definition
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Term
| When leak testing a water box, be certain the water has been removed before... |
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Definition
| placing the leak detector probe through the drain valve. |
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Term
| To leak test a tube, use a... |
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Definition
| hydrostatic tube test kit. |
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Term
| Systems with open drive compressors are prone to leaks at the ... |
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Definition
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Term
| What can be used to pressurize a chiller system before opening the system for a non-major repair? |
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Definition
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Term
| After reaching the required vacuum on an appliance when servicing, moisture is indicated by; |
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Definition
| multiple rises in pressure over a period of time with increase of pauses between rises |
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Term
| EPA required evacuation levels for recovery or recycling equipment manufactured or imported before Nov. 15, 1993 is |
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Definition
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Term
| EPA required evacuation levels for recovery or recycling equipment manufactured or imported on or after Nov. 15, 1993 is |
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Term
| Refrigerant recovery from a system using R-11 or R-123 starts with |
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Definition
| liquid removal and is followed by vapor recovery |
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Term
| If a strong odor is detected during the recovery process, |
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Definition
| a compressor burn out may have occurred |
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Term
| When installing more than one pressure relief valves must be installed; |
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Definition
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Term
| The owner must keep records of refrigerant added during service and maintenance on equipment; |
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Definition
| with charges of 50 lbs or greater |
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Term
| After all the liquid has been removed from an average 350 ton approximately how much vapor refrigerant remains in the system |
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Definition
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Term
| When charging a system with a low pressure refrigerant should be introduced as a vapor to raise saturation temperature to a minim of; |
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Definition
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Term
| Where is the purge unit located in a low-pressure system? |
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Definition
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Term
| In a chiller air and other noncondensables collect; |
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Definition
| at the top section of the condenser |
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Term
| A rupture disk for low pressure chiller will rupture at; |
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Definition
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Term
| The Standard for machine room safety is; |
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Definition
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Term
| Who establishes the refrigerant safety group standard |
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Definition
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Term
| A low pressure chiller used for comfort cooling must be repaired if it has an annual leak rate of ____ of the total charge. |
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Definition
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Term
| ASHRAE 34 Standard Safety classifies R-134a as; |
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Definition
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Term
| Because a low-pressure system operates below atmospheric pressure (in a vacuum), |
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Definition
| leaks in the gaskets or fittings will cause air and moisture to enter the system |
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Term
| To repair a chiller operating with R-22 the technician; |
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Definition
| must have a type II certification |
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Term
| Which of the following refrigerants has a safety classification of B-1 |
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Definition
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Term
| During evacuation of systems with large amounts of water, it may be necessary to; |
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Definition
| increase pressure by introducing nitrogen to counteract freezing |
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Term
| When leak testing a low pressure chiller, the maximum pressure to use is; |
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Definition
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