Where should a liquid line solenoid be fitted?
The solenoid valve should be fitted as close to the expansion valve as is practical, especially if the system is operating on a pump down. If the solenoid valve is mounted close to the condensing unit and there is a long pipe run it is possible for the liquid line to drain down into the evaporator causing problems on start up, e.g. liquid slugging. On a pump down system the liquid line should be acting as part on the liquid receiver. If the solenoid valve is positioned such that the liquid line has to be pumped down this may require a much larger liquid receiver to be fitted or the system may trip on it’s HP control.
