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Old Powervent pics for Biz, and the viewing public.

2K views 7 replies 7 participants last post by  CaptainBob 
#1 ·
Just wondering how many on here have seen these? I come across them once in awhile. Learned many things with this particular unit.

Problem was pilot would not stay lit. Replaced thermocouple, pilot would not stay on. Seemed like a faulty gas valve, tech support agreed.

What I found neat was that the pressure switch was tied into the pressure tap for the gas. The other line just hangs out in the burner area.
 

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#5 ·
It was sold packaged with tank water heaters for awhile (mostly AO Smith) and also sold as an accessory. Later replaced with a tank mount venter mostly to compete with Bradford White that had the 6' rubber hose, and AO Smith introduced the first PVC venting on a standard HWT. It was the high amount of dilution air that kept the pipe from melting,

It is a add-on Tjernland power venter. The pressure switch sensed gas flow and would start the fan, once fan was proven, it would open the gas solenoid allowing gas burner to ignite. It included draft hood spill switches and an extra tube to burner area to vent pressure switch.

The fan inlet was adjustable to control draft over fire but seldom understood or adjusted. It was incredibly inefficient since it would draw excessive air besides expelling tremendous conditioned ambient air.

The other popular unit was and still is the field unit where the motor is outside in a hood and much quieter.
 
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