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R to g
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johnjohn89
Member Posts: 100
Guys what should u reading voltage between r to g during the heating mode? 28v or ov? Some unit I work on when during the heating mode I do get voltage readings between r and g, other I don’t , but I do believe that g get power by other , doesn’t power same time
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Comments
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There's so many different ways to wire the fan for heat mode. Some will use G, and some won't.
A PSC motor could get direct line volt power from an aquastat, or an internal time delay relay.
A variable speed could get voltage on W1 and start the fan. Voltage at W2 will increase fan speed.
The wiring you see where G is powered for fan in heat mode is usually done at the thermostat. There will be a "gas/electric" switch, or it will ask during installer setup "equipment or thermostat controls fan in heat mode".1 -
ratio said:Depends on how the control board is built. Some may back feed the G terminal when the limit turns the fan on, some may not.pecmsg said:If a switch is closed you get 0 voltage
if a switch is open you get voltage0 -
HVACNUT said:There's so many different ways to wire the fan for heat mode. Some will use G, and some won't.
A PSC motor could get direct line volt power from an aquastat, or an internal time delay relay.
A variable speed could get voltage on W1 and start the fan. Voltage at W2 will increase fan speed.
The wiring you see where G is powered for fan in heat mode is usually done at the thermostat. There will be a "gas/electric" switch, or it will ask during installer setup "equipment or thermostat controls fan in heat mode".0
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