Re: Ruud Electric Furnace Cannot Reach Setpoint - "Watt...
Unfamiliar with watt restrictors.
heat strips have 2 safety devices, a thermal overload, they get to hot they shut off, cause not enough air flow increase fan speed this device is auto reset. a fusible link a fail safe to thermal over load, no reset and sometimes replaceable. if this does not help would like to ask you a few questions. one of the buildings i take care of has 200 + reem/ ruuds all electric heat. if a part is defective replace, please do not by pass. safety frist.
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Are you talking about a pro 5000 Thermostat??? if so then NO it will not work.With this stat you do not have a temperature lock on the heat pump. Say you don't want the heat pump to run below 25 degrees. it won't shut the heat pump. And you don't want the heat pump to run at the same time as the furnace. With the Pro 8000 3 heat and 2 cool thermostat you can lock out the heat pump at 25 degrees outside an turn the furnace on. You will have to install an outdoor thermostat hooked up to the pro 8000 it usually comes with the stat. Honeywell products.
sonds like u have a bad safety switch they r round and have 2 wires on them usually and u can check them by taking the wires off of them and checking continuity thru them there might be one on the blower housing also either that or ur blower relay may be bad and stuck closed
Heat pumps tend to blow a much lower temperature outlet air than a gas fired unit would. Is this your first year with this furnace? Depending on your outside temps, an auxiliary heat strip may not be operating properly.
This could be normal. Some thermostats are designed with a heat anticipator. The anticipator takes into consideration heat that will remain within the system after the burners shut down, it anticipates the "left over" heat will be enough for the thermostat to reach it's setpoint. If it did not have this function the setpoint would be overshot.
If you are suggesting it shuts off well below the desired setpoint please clarify.
That's crazy, we're having the same problem. Turns out there was a wattage restrictor in the furnace that was switching off 3 of the 5 heating elements in an attempt to save energy. Basically, the restrictor was sensing that the incoming air was warm, so only 2 of the 5 coils should be needed to heat the air. Well that wasn't enough and we just sat with the furnace running all day long struggling to reach the 70 degree setpoint.
This is something a technician can diagnose in a few minutes, but not the sort of thing a DIY'er should really handle.
I think what you are trying to ask is should you use a 2 stage thermostat or stick with a single and just double the stages on a relay to work at the same time. As long as the relay can handle the amp load, there is no real need for a 2 stage heat system, unless you are concerned by the efficiency of $$. If I am missing the question please reply.