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Need to purchase the wire and breaker switch for a Hitachi A/C Unit 30 ton unit. RUA-30HS. I need the tecnical specifications for this installation do you have them. Or can you help me with three questions: Starting Voltage and load? Average Running voltage? Recommended size of Breaker Switches? The Amperage is 3 phase so what size of cable is required? Thank you so much for your help.

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Get an electrician you trust in your area. He will need probably need to physicially look at the unit. Then he can answer all your questions on this matter

Posted on Jan 10, 2009

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Posted on Jan 02, 2017

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Need Minimum Circuit Ampacity and the Maximum Fuse Breaker for the Condenser - Thak you


Serial numbers don't tell much.
Model. numbers describe the unit best an 18 in the model is for 1 1/2 ton,24=2 ton, 30 =21/2 ton 36=3ton etc

May 02, 2015 | Heating & Cooling

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Where is breaker located in hitachi split ac


you didn`t told if it is already installed or just going to install.by the way,it has no breaker in it even on outdor unit,the only components that switching in it`s power are relays controled by electronic ckt the.installers of it,they just attaching the hot wire from your DB`s to the a/c switch(20 ampers,35 amperes) and going down to indoor units.your main distribution box has its own load schedule for it`s breaker attached in it.and not in your split type unit.the way of tracing it is look for the label opposite side of DB`s cover and it shows you where of those breakers are loaded by your a/c.

Apr 19, 2014 | Hitachi RAS-09UH Air Conditioner

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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

Jul 21, 2012 | Rheem R-410A Complete Split System Heat...

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I believe I might need to change my (20 amp) breaker switch that is running on 10-2 wire which supplies power to my Rheem Classic 10 Seer. I'm not sure if I need to have 220V of power on a 30amp...


Hello, the unit runs on 220 volts that's why # 10 wire must be used. The best bet is to use a 40amp breaker for 220 volts, gives the circuit more protection.

Sep 04, 2011 | Heating & Cooling

2 Answers

I have a raka-037jaz air cond. I was wondering what size is this unit? And if my breaker keeps tripping for the outside condenser does that mean my compressor is workIng too hard and needs to be replaced?...


Hello You have a 3 ton unit with a 10 SEER rating.this unit should NEVER be on a 50 amp breaker.The breaker size is on the model plate/sticker....any way the compressor is shot and it is time to find a new 3 ton condensing unit.espescially if it is TRIPPING a 50 amp.Good luck

Jun 17, 2011 | Heating & Cooling

1 Answer

Just need to find out what max current during hot weather (Houston, Texas) will this unit require? If this is the only thing on the circuit is a 15 amp breaker enough? Thanks Bill


Unless this is a very small unit I would not use anything less than 20 amp. and then only if it is a newer unit with scroll type compressor.
I generally use 30 amp. as most unit of two ton cooling or more can draw 17-26 amp on start up. Hope this helps. I also would not use less than 10 gauge wire for supply. Thank you

Dec 09, 2010 | Heating & Cooling

1 Answer

Purchased "Reliance Lowboy electric water heater"


The water heater has two 4500 watt elements.
However both elements are not turned-ON at same time
So the water heater is 4500 Watts

Volts x Amps = watts
Amps =watts divided by volts
Amps = 4500 Watts divided by 240 Volts
Amps= 18.75

So that says a 20 amp breaker ... except for the 80% rule
80% rules says for safety, your Amp rating should be multiplied by 80%

20 amp breaker X 80% = 16 amps
20 amp breaker is actually safe for just 16 amps, and your water heater draws 18.75 amps.

The calculation shows you need a 30 Amp breaker.
30 Amp breaker requires 10 gauge wire.

http://waterheatertimer.org/Figure-Volts-Amps-Watts-for-water-heater.html

Nov 02, 2010 | RELIANCE ELECTRIC WATER HEATER

1 Answer

I need Hitachi RUA-30AT3S wiring diagram. This is a self contained air conditioner. Rats damaged all wires while it was in store. I have no clue about re-wiring.


FSM Forums • View topic - Hitachi Air Conditioner ManualsHitachi Air Conditioner Manuals - looking for Operations & Maintenance Manuals, ... RUA 30AT3S (Package 30 Tons) RUA10AT3S (Package 10 tons) ...
www.manual-directory.com/forum/viewtopic.php?f=10&t=2453...0 Hi, although your unit is a 2 1/2 ton, you will be able to get a manual showing you the correct wiring diagram using the model number you supplied. It shows your model above. This is the only way to get a diagram for this unit. Please keep me posted on the out come or if you need more help.
Sincerely,
Shastalaker7

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1 Answer

Unit comes on and runs for 5 minutes, the circuit trips off


30 is the correct size breaker for this unit. It sounds like there is a grounding issue going on in the system. Or off of the Thermostat. Something is grounding out causing the switch to trip. Are you running #10 wire to breaker and the unit? If not you will need to increase your wire size

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