I know this is way off the HVAC supject, but it the exuasting question is still part of the whole theme of our industry. Was called out to a restaurant with a large Holbart dishwashing unit. The unit has it's own personal 12x12 stack that shoots up to the roof and there is attached the cutest little exhaust venter.
Employees complaining that after 12 years of perfect operation, the dishwasher is not exhausting the steam up and out. Jumped up on the roof and found the motor was on thermal shut-down. Noticed instantly that this poor motor (1/20hp 1550rpm 115v 1.1A) was not rated as a continuous duty motor, yet it is hardwired to the building to run 24/7?
I have not a clue how these big belt driven dishwashers that use high pressure steam and chemical dispersion, work. Curious though, that if they have their own venting system attached then what if this unit controls the exhaust fan attached up on the roof. Pulled the panel spent a few minutes going over schematics and noticed a dedicated relay that is wired to a set of terminals labeled "venter motor".
QUESTION I know that there is a very slim chance that anyone would know and I should be contacting the manufacture. But I want to see how involved I really want to get on this.
But has anyone seen/installed/touched/or come across one of these units and does the venter (per my assumption) should be controlled by the unit? Or being hardwired and running for 12 years non-stop, probably tripping out on thermal every 20minute, not an issue?
This really isn't my cup of tea, but I would really like to figure the motor issue out and get a foot in the door with this chain of local restaurants. They had the local techs come out and say that the venter was an HVAC issue and not their problem, "dishwasher is running great, sorry about the steam filling the kitchen! Heres my diagnostic bill, call a HVAC guy!"