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Question:

If an amount of air exists in low pressure system, it will _______

A Cause high head pressure
explanation

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Related Questions

The standard for machine room safety is ____.

ASHRAE-15

ASHRAE standard 15 requires a refrigerant monitor that will sound an alarm and automatically start a ventilation system in equipment rooms before the refrigerant concentration reaches the TLV‐TWA, (threshold limit value‐time weighted average).

What should be done after recovering liquid refrigerant from refrigeration system?

Recover the vapour refrigerant

EPA regulations require that any appliances containing more than 50 pounds of refrigerant, except for commercial and industrial process refrigeration, must be repaired when the leak-rate exceeds ______ of the charge per year.

10 percent

EPA regulations require that any appliances containing more than 50 pounds of refrigerant, except for commercial and industrial process refrigeration, must be repaired when the leak-rate exceeds 10 percent of the charge per year.
NEW LEAK THRESHOLDS WERE EFFECTIVE IN JAN 2019:
30% for Industrial Process Refrigeration
20% for Commercial Refrigeration
10% for Comfort Cooling
PREVIOUS THRESHOLDS NOW OUTDATED:
35% for Industrial Process Refrigeration
25% for Commercial Refrigeration
15% for Comfort Cooling

In which part of low pressure refrigeration system may the leaks occur?

Gaskets & Fittings

What is the purpose of rupture disks in low pressure chillers?

To relieve the pressure

A partial charge low pressure system can be effectively leak checked by _______

Increasing refrigerant pressure by adding external heat source.

In a low pressure refrigeration system, the rupture disk is connected to _______

Evaporator

What can a technician do to prevent trapped water freezing, which is caused by using a large vacuum pump?

He should increase the system pressure by introducing nitrogen gas.

What type of equipment can be worked on with Type III certification?

Low-pressure

Technicians must be certified as a Type III Technician or a Universal Technician to maintain, service, repair or dispose of low‐pressure appliances.

In a low pressure system, if the maximum pressure setting exceeds during leak checking, it will _______

Cause a rupture failure

According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above ______ during a standing vacuum test, the system should be checked for leaks.

2.5 mm Hg

According to ASHRAE Guideline 3-1996, if the pressure in a system rises from 1 mm Hg to a level above 2.5 mm Hg during a standing vacuum test, the system should be checked for leaks.

To obtain an accurate vacuum readings during system evacuation, the system vacuum gauge should be located ______.

as far from the vacuum pump as possible.

According to the EPA, there is approximately ________ of refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed.

100 lbs

According to the EPA, there is approximately 100 lbs of refrigerant vapor left in an average 350 ton R-11 chiller at 0 psig pressure once all the R-11 liquid has been removed.

How much of vapor is contained in a 350 ton R-11 chillier after all the liquid has been removed?

100 lbs

The hydrostatic test is used to check _______ within a chiller.

Tubing leaks