Factory Training
Factory Training
I'll say it again.
Many types of HVAC systems, small and large will not START if the wiring is reversed or if they are don't see a ground connected, OR if the shield wire on say larger Centrifugal chillers etc. is not landed on ground on BOTH ends.
The service schools always say this, but they don't say why. So it is drilled into the HVAC guys to be sure the power is as thus.
A lot of HVAC Techs are thrown out there with insufficient training and overloaded to run volume. The younger less experienced ones often have not perfected how they cope with all the stress along with the increasing complexity of many types of equipment and all its quirks and myriad instabilities. Many in this boat don't take enough time to look at simple-basic things when thoubleshooting, say such as a loose neutral junction at the machine etc or loose connections in the control chain, or low voltage on the control circuit......
With that said, MOST matters can be solved in a straight forward way, but the incidence of unusual types of scenarios is and has been growing for some time. In those cases the ROOT of the matter will be veiled under some complexity that is not something obvious or seen every day. There are threads on this board which deal with similar matters in the electrical realm.
Many times its possible to call factory Engineering on a problem and they will not know what the hell is going on with low end residential equipment. Once you get into larger equipment such as medium tonnage chillers etc. the Tech Support Engineers will start talking with expertise and things can be worked out IF the Tech can communicate effectively.
The Rod type sensing systems work by FLAME RECTIFICATION, where an AC signal becomes DC when there is flame on it.
Because everything has been monetized and also due to Engineering trends that have been steadily declining over the last 20-30 years, a great deal of the control boards out there are complete junk. [Just like much of the electrical gear being forced on us]. Many will not stand the slightest bit of dirty power or fluctuation on the line, after which they will lock out with FORCED manual reset.
The old school controls such as the Honeywell RA-890 etc. did not behave this way. The older stuff was a LOT more stable. The Engineers are not being held accountable for making things reliable.
Nowadays equipment is running people rather than vice versa, and everyone knows it.
Its a useless, time wasting state, and we the people need to reverse it.
It starts with calling a spade a spade when things don't work and waste your time which is valuable.
