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I have a Nordyne model GQ3RD-042K tHE CIRCULATING Fan is connected to the heat side 80 amps. I want to change to the A/C side 40 amps How do I do this. I have a wireing digram for this unit but do not under stand how to accomplish this.Can Anyone Help me.

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  • mike bare May 11, 2010

    the fan is connected to this side so that it will come on any time that the heat is on is still only pulls about 3 amps in cooling mode if you have a digital stat it brings in the fan automatically the fan may be controlled by stack type switch that has a built in delay why the change needed? thanks

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SOURCE: Cir Fan on 80amp. A/C on 40amp. If 80amp is discon A/c has no fan

swap breakers

Posted on May 21, 2009

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1 Answer

Need electrical schematic for Intertherm P3RA-024K


Hi Val
check this out maybe it helps.
http://www.manualslib.com/manual/507003/Nordyne-P3ra-030k.html?page=9#manual

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What size wire and how does it hook to thr unit rpkb-036jaz


Look at rating plate on side of unit for Volts, Amps, Watts.
Volts x amps = watts.
If unit is 240Volts, then you need double-pole 240Volt breaker
If unit is 8500 watts at max power, then 8500 watts divided by 240Volts = 35 amps.

What size breaker for 35 amps?
When electricians figure load rating for breakers, they use the 80% rule.
40 amp breaker x 80% = 32 amp safe maximum load for 40 amp breaker. Use 8 gauge wire with 40 amp breaker.
50 amp breaker x 80% = 40 amp safe maximum for 50 amp breaker. I use 6 gauge wire with 50 amp breaker.
60 amp breaker x 80% = 48 amp safe maximum for 60 amp breaker. Again, use 6 gauge wire with 60 amp breaker.

How to connect wires to unit.
First of all, all outdoor HVAC units require power cut off located next to unit.
This lets the mechanic, or service tech turn power off to work on unit, even if the mechanic does not have access to main breaker box.

Next, open unit to see where wires connect.
If unit has wires, then connect both hot wires from 240 breaker to the wires inside unit. Connect bare ground wire to green ground screw.
If unit has terminals. The terminals will be labeled L1 L2. Connect each hot wire from 240Volt breaker to either one of the screw terminals. Then bare ground goes to green ground screw.

Copy following links for basic illustrations connecting wires to terminals, and to breakers, and selecting wire size.
http://waterheatertimer.org/How-to-wire-Tankless-electric-water-heater.html

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