Operation & Installation Manual

May 28, 2014 ... sub-cooled liquid into receiver. a. Find and repair leak if present. Recover refrigerant and weigh in proper charge. b. Replace valve. 3. Head pressure high/ liquid line returning from ... A pump-down system consists of a normally closed solenoid valve installed in the liquid line and a low- pressure control...

Application Bulletin 101 - Bristol Compressors

Oct 2, 2015 ... In light of today's need for more energy efficient refrigeration, air conditioning and heat pump systems, we find .... system must be completely equalized for this phenomenon to take place. ... If a pump down cycle is used, an approved start capacitor and relay must be used on all compressors having.

Refrigeration Manual

of a pumpdown cycle. By closing a liquid line solenoid valve, the refrigerant can be pumped into the condenser and receiver, and the compressor operation controlled by means of a low pressure control. The refrigerant can thus be isolated during periods when the compressor is not in operation, and migration of refrigerant...

Solenoid Valves - Parker Hannifin

installation. An exploded view of a typical solenoid valve is illustrated on page 4 in. Figures 5 and 5A. Position – All standard solenoid valves may be mounted horizontal, on its side or in a ..... two valves should be pumped down completely before disassembling the .... which could result from the refrigerant in the presence.

Discharge Bypass Valves - Sporlan Online

must be done so as to protect the compressor at all times. This includes protection against overheating, slugging with liquid refrigerant, and trapping of oil in various system locations. The inlet connection on the discharge bypass valve should be sized to match system piping requirements. If a hot gas solenoid valve is used,...

CME650R - Scotsman Ice Systems

compressor contactor coil. Its Cut In is 30 PSIG and its Cut Out is 15 PSIG. Located behind the control box. CONTROL BOX. Cube Size Control. Relay. Timer & ..... pump down control. Low refrigerant charge. Locate leak, repair, replace drier, evacuate and weigh in nameplate charge. Liquid line valve or drier restricted...

2.5 Other components - SWEP

This causes the oil that is transported by the refrigerant gas to be captured by the metallic filter in the inlet. The oil then forms droplets, which fall down to the bottom of the oil separator. When the oil level is high enough, a float-valve is opened that allows the high pressure to force the oil back to the compressor. As a final...

Refrigerant Piping Design Guide - InspectAPedia

A pump down solenoid valve. If a pump down is utilized, the solenoid valve will be located just before the TX valve, as close to the evaporator as possible. • Receivers in the liquid line. These are used to store excess refrigerant for either pump down or service (if the condenser has inadequate volume to hold the system...

the causes of oil pressure problems in refrigeration systems and ...

Feb 8, 2017 ... Many refrigeration compressors serviced today have positive displacement oil pumps to help lubricate the internal compressor parts. Most compressors that have .... A refrigeration system should be fine tuned after installation and start-up. ... Migration can be controlled with the use of a pump down solenoid.