What is the compressor discharge line?
Discharge gas lines (often referred to as hot gas lines) allow refrigerant to flow from the discharge of the compressor to the inlet of the condenser. • Undersizing discharge lines will reduce compressor capacity and increase compressor work.
What could cause a compressor to sweat around the suction line?
A sweating suction line is perfectly normal. Excessive sweating might be caused by not insulated well enough or too cold due to poor air flow over the evaporator. Some types of systems might sweat a lot because of being overcharged but in that case, usually the whole compressor will be sweating.
Where are the suction and discharge ports on a compressor?
The suction side (low side) and discharge side (high side) ports are usually stamped with the letters “S” or “D” on the compressors head. COMPRESSORS Table of Contents
How does the suction line affect the compressor?
•Undersizing the suction line reduces compressor capacity by forcing it to operate at a lower suction pressure to maintain the desired evaporator temperature. •Oversizing the suction line increases initial project costs and may result in insufficient refrigerant gas velocity to move oil from the evaporator to the compressor.
Why do I open the suction line first?
That is often due to opening the liquid line first and the compressor losing oil to the discharge line and then to the liquid line. When you open the suction side slowly first, oil loss from the compressor will enter the suction line. Once the compressor begins running, it will pull that oil back into the compressor.
What should the pressure drop be on a suction line?
•Suction lines should be sized for a maximum of 2 to 3°F (1.1 to 1.7°C) pressure loss. •The actual pressure drop in kPa will depend on the refrigerant. •Fall: Suction lines should continously fall in the direction of flow – 10mm/m minimum •Gas Velocity needs to return oil to the compressor even at low load
The suction side (low side) and discharge side (high side) ports are usually stamped with the letters “S” or “D” on the compressors head. COMPRESSORS Table of Contents
That is often due to opening the liquid line first and the compressor losing oil to the discharge line and then to the liquid line. When you open the suction side slowly first, oil loss from the compressor will enter the suction line. Once the compressor begins running, it will pull that oil back into the compressor.
What should the suction line be in a direct expansion evaporator?
Slope horizontal suction line downwards in the direction of the compressor at least 1/2” fall per 10 feet of line. The setting of the refrigerant control device (expansion valve) should maintain a minimum of superheat. This is typical of the usual direct expansion evaporators where the oil is returned by refrigerant vapor.
How to check high suction and low discharge pressure?
High suction pressure, low discharge pressure 1. Inspect valve plate, reed and gasket areas Replace valve plate and gaskets Low suction and discharge pressure 1. Check for low refrig. charge 2. Refer to service manual 3. Refer to service manual Replace shaft seal, gaskets oil fill plug, etc. 2. Leak check compressor