When refrigeration systems are exposed to low ambient conditions, the condensing pressure (head pressure) will fall. If the head pressure gets too low, the metering device will not have enough ...

This article deals with low ambient head pressure controls containing charged domes. Their function is to keep a proper condensing pressure at the metering device for proper feeding of the evaporator.

What I wouldn't do for ambient lighting in my office. To be sure, there's something to be said for full-blown fluorescent light 24 hours per day, 7 days a week. It smacks of endless productivity. No ...