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Wiring Question: How to run 230V motor with a 115V relay.

D

DFZ

Member
Question for all the electricians out there..

We are building a new 30"x100" greenhouse this winter and I need some advice with the electrical.

It uses two 36" exhaust fans powered by 1/2HP electric motors. The motors are either 115 or 230V.

I would prefer to use them 230V to keep wire size and amperage down.

The problem is they are turned on by (2) 115V thermostats that also opens (2) 115V electric shutters.

I was wondering if I could use the 115V thermostats to open the shutters, and also trip a relay to turn on the exhaust fans on a different 230V circuit.

I have seen relays like the one linked below for sale in catalogs, but I am not sure which one to choose. Also, how
are they normally mounted? Do they fit in a normal junction box? I also see the sockets listed, do they fit in a juction box.




http://www.farmtek.com/farm/supplies/prod1;ft1_electrical_supplies-ft1_motor_starters_relays;pgmr2853_MR2861.html

http://www.farmtek.com/farm/supplies/prod1;ft1_electrical_supplies-ft1_motor_starters_relays;pgmr2853_MR2876.html

Thanks for any advice,
Doug
Relay
 
The nice thing about HVAC equipment is that you can do almost anything you want as long as you have the bucks. The best thing here is to keep it simple. But to answer your question- YES you can. Do you have any over current protection in the circuit between the motors and the breakers? If not, you really should have a fused disconnect locally at the motors. It is code and it makes servicing the motor so much easier and protects the rest of your electrcial system in the event of a motor failure. I assume that the motors are single phase since they are 115/230 volt rated. I would use a double pole, double throw contactor with a 115 V coil to power the motors. Sometimes these contactors can be purchased with auxiliary contacts which can also coontrol power the damper motors so they operate as one unit and are controlled from your thermostat. Let me know if you need a schematic drawing of how to hook it all up.
 
I would use something like this Grainger #5z546 relay and Grainger relay enclosure #6cva2. This relay will handle 1.5 hp @240 volts. The connections are big enough to connect your wire to and the enclosure has 1/2 inch knockouts for conduit. The coil will be energized with the thermostat. The relay you show requires a subbase and enclosure.
a63043.jpg

a63044.jpg
 
Another alternative is Grainger Contactor 5JGU5 with a 5CHJ8 auxilary contactor (this aux contact has two normally closed contacts) or 5CHJ7 ( one nomrally open and one normally closed contact) either one attaches to the side of the main conatctor. When the thermostat enrgizes the main contactor coil, aux contact is also main operating your shutters. This entire unit unt should be mounted in a NEMA Class I enclosure to be protected from moisture.
 
DH
I certainly hope that you are not a electrician. I'm not by any means, but with the contactor that you have pictured, it will go up in smoke as soon as line voltage is applied. L@@k, it says 24v coil on bottom!
 
You Dumbarse if you had looked up that Grainger number you would have found that it has a 120 volt coil. That is a gernic picture.. I am a licenced Electrical contractor in NC. I at least am a member of this site and you do not have the balls to sign in "Mr Guest". DH
 
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