Table of Contents
Where does the purge unit on a centrifugal system takes its suction?
condenser
The primary purpose of a purge unit is to remove non- condensables from the system. A centrifugal chiller’s purge condensing unit takes its suction from the top of the condenser, removes air and other non-condensables from the system, and returns refrigerant to the evaporator.
How does a centrifugal purge unit work?
The purge unit is a small, independent, adjunct refrigeration system that separates the non-condensables from the refrigerant and recondenses and collects any refrigerant in the exhaust vent stream. The remaining non-condensables (mostly air) are then vented.
Where is the purge unit located?
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’s the function of a purge unit?
A purge unit is typically used to remove air and other non-condensables from the refrigeration system. The purge unit is a small, independent, adjunct refrigeration system that separates the non-condensables from the refrigerant and recondenses and collects any refrigerant in the exhaust vent stream.
Where is the rupture disk located on a centrifugal chiller?
25 Cards in this Set
| Where should the discharge from a rupture disc be piped for venting? | Outdoors |
|---|---|
| Where is the rupture disc located on a centrifugal chiller? | Evaporator |
| A hydrostatic tube test kit will; | Determine if a tube leaks. |
What is the function of the purge unit quizlet?
What is a high efficiency purge unit? It removes non-condensables that contain a low percentage of refrigerant. This adds to the value of the purge drum in refrigerant containment.
How does a purge system work on a chiller?
Purge operation system for refrigerant in chiller compressor is carry-out to remove air and moisture; The mixture enters the purge tank, and the refrigerant condenses on the cold evaporator tubes and returns to the chiller condenser as a liquid. The air does not condense but instead accumulates in the top of the tank.
How does a centrifugal chiller work?
A centrifugal chiller uses the vapor compression cycle to chill water. It throws off the heat collected from the chilled water plus the heat from the compressor to a water loop. The water loop is cooled by a cooling tower. Centrifugal chillers are popular because they have relatively few moving parts.
What does purge mean on AC unit?
“Purging” is the process of clearing an air conditioner’s (AC’s) unit’s internal lines and hoses. This is frequently done before recharging freon but. many newer model AC units, such as Honeywell units, purge the system on startup.
Where is refrigerant added to a centrifugal machine?
Type III
| A | B |
|---|---|
| Evaporator charging valve | Refrigerant is added to a centrifugal machine through which valve? |
| Nitrogen | During evacuation of a system with large amounts of moisture it may be necessary to increase pressure with gas such as what to avoid freezing? |
What is the primary purpose of a purge unit on a low pressure chiller?
Low-pressure chillers require purge units because they operate below atmospheric pressure. The primary purpose of a purge unit is to remove non-condensables that leak into a low-pressure chiller system.
Why do chillers require purge units?
Both CFC-11 and HCFC-123 chillers require purge units because: leaks in the appliance make evacuation to the prescribed level unattainable. Where does refrigerant go after it leaves the purge unit of a low pressure centrifugal system?