Re: Wiring for 230 volts electric motor for RUDD furnace

sokkia58 wrote:

The motor on my commerical furnace (heat+air) went bad. I took the
motor out. The existing motor was an Emerson motor, 3/4HP,1075 rpm,6.3
amps,230volts with no capacitor. The existing motor is a 2 speed motor.
The motor had 4 wires (brown,black,red,orange). All these wires were
directly connected to same color wires from the furnace controls.

I bought the replacement motor with same specification (3/4HP,1075
rpm,6.3 amps,230volts) but it needs a capacitor (15MFD). The shop told
me it was a three speed motor. The new motor has 5 wires + small green
ground wire coming out of it (2 brown wires;#1 black wire;#2 black
wire;#3 black wire). The wiring diagram on motor shows that the brown
wires go to the capacitor & #2 & #3 black wires are low & high speed.
The #1 black wire is a common wire.

How do I connect these wires to the existing black, orange, red & brown
wires coming out of the furnace.

I did some juice checks of the exisitng wires. When the heat on the
thermostat is off & the electric motor switch on the thermostat is set
to "auto", the brown & orange wires have juice in them. When I change
the fan setting to "on" (heat still off) the brown, orange and black
wire gets the juice. The red wire never gets the juice.

Primpt help will be greatly appreciated since we do not have heat in
the building.


Why didn't you ask the vendor for data on the motor? You didn't give
a model number or brand so anyone could even try to help you. You
posted through Google. Use their search engine to find the
manufacturer's website and download the data.


--
Service to my country? Been there, Done that, and I've got my DD214 to
prove it.
Member of DAV #85.

Michael A. Terrell
Central Florida
.

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