# HVAC help **URL:** \ **Category:** PittSpeed Off Topic\ **Created:** [May 31, 2007, 3:19pm UTC](https://forums.speedlife.net/t/hvac-help/190257 "2007-05-31T15:19:57Z")\ **Posts on this page:** 1\ **Showing post:** 7
**Author:** ![Bravada\_442](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/bravada_442/32/5982_2.png) [@Bravada\_442](https://forums.speedlife.net/u/Bravada_442)\ **Post date:** [May 31, 2007, 9:09pm UTC](https://forums.speedlife.net/t/hvac-help/190257/7 "2007-05-31T21:09:58Z")
> [@This is why i hate cobalt ss drivers](https://forums.speedlife.net/t/this-is-why-i-hate-cobalt-ss-drivers/27102/118): > > The only time that the freeon charge would be an issue on it not runnin would be in a very high end condensing unit that would have a low pressure switch. > > If pressure within system drops too far it would open the switch not allowing the control circuit to be completed. wich prevents the unit from running A vast majority of new units (within the past 3 years or so) have both high and low limits on them, especially those with Scroll compressors that they are concerned will burn up even on a very small change in freon level. --- _[View the full topic](https://forums.speedlife.net/t/hvac-help/190257)._