Originally, My contractor put the nutone heater upside down. Could that be why the fan no longer works properly (3years) Very noisy sound with a burning smell after a few seconds. Should I replace the heater?
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My Nutone Model 765HL uses the same heater; I tried the Broan-Nutone website but they were out of stock. Finally found it at Central Vacuum Stores for $35. Here's the direct link: http://www.centralvacuumstores.com/nutone/Broan-Nutone-Heater-Elements/QTXN-Series.php Hope this helps!
It may be, Rinnai suggests a maximum length of about 13 equivalent feet of venting including elbows. Add 6 feet for every 90 degree elbow. If the vent is longer than this it is taxing the combustion fan motor and it will start giving you error codes and will not ignite. Remove the trim panel from behind the heater and find the flexable air intake pipe. Temporally remove it from a fitting and test the unit a few times to see if the unit starts quieter. This procedure will be taking room air into the heater for combustion and circumventing the direct vent feature of the heater, not a fix. Have you had the gas pressure tested? It gould be that! You may wish to consider relocating the heater and fire your installation contractor for putting you in this predicament, not Rinnai.
all depends on the wattage of the heaters. add up the wattage of the heaters divide that answer by 220 and that will give you your amperage draw, then you must size your wire, breaker and outlet accordingly. you can only load a braker to 80 percent of its amperage by the CEC.
Buy a tube of Household Goop, and put some on the front and back of the hole the motor shaft goes through and glue the wheel in place. Make a little 'pile' or filet around the shaft/wheel joint. Let it dry a couple of hours.Goop is extremely handy, sticks like glue should, stays flexible, is cheap, etc.
If you have the old Thermador ceiling type of heater that must be mounted on the ceiling surface there aren't many choices. Only the Broan-Nutone 154 & 157 models. The 154 @ $37 didn't seem to last too long but it's 1/3 the price of the radiant 157 model at about $100+ dollars. The radiant model may last longer