I am new to the site. I am currently an industrial commercial HVAC tech. I am also an adult instructor at a local vocational school, the class: introduction to residential HVAC.
I wanted to get some industry pros opinion on the best method for heat pump lock out for dual fuel systems i.e. indoor coil located above the heat exchanger.
For example: Independent outdoor temp sensor to lock out the HP.
White Rogers series 90 or other variation, internal lockout, upon W2 engagement after 1 minute.
Independent dual fuel relay kit. Consists of three double pole double throw relays. Immediately locks out HP with W2 engagement
My top choice would be the relay kit, but it is an extra expense for the customer.
The T-stat lock out is great but it waits a whole minute to lock out the HP. Too long IMO.
So what is your opinion?
I apologize for the misspelling in the title I can't seem to edit it.
[Edited by journeymen on 11-11-2005 at 10:59 AM]