No, the system has an auto-restart feature enabled (which can be disabled if needed by the owner).

<p id="isPasted" style="box-sizing: border-box; margin-top: 0px; margin-bottom: 1rem; line-height: 1.8; color: rgb(33, 37, 41); font-family: -apple-system, BlinkMacSystemFont, &quot;Segoe UI&quot;, Roboto, &quot;Helvetica Neue&quot;, Arial, sans-serif, &quot;Apple Color Emoji&quot;, &quot;Segoe UI Emoji&quot;, &quot;Segoe UI Symbol&quot;; font-size: 16px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: left; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: rgb(255, 255, 255); text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">No, the system has an auto-restart feature enabled (which can be disabled if needed by the owner).

When the power goes out, do the units need to be restarted manually?

1. Checking the product page. Go to the product page you are interested in and scroll down to the Outdoor Unit Data section. Most models will have the breaker size listed. 2. Checking the Technical Brochure. On the same product page, navigate to the

<h1 id="determining-breaker-and-wire-size-for-pioneer-split-systems">Determining Breaker and Wire Size for Pioneer Split Systems</h1><h3 id="breaker-size">Breaker Size</h3><h4 id="there-are-3-ways-to-determine-the-breaker-size-and-wire-type-needed-for-a-pioneer-hvac-system">There are 3 ways to determine the breaker size and wire type needed for a Pioneer HVAC System.</h4>1. Checking the product pageGo to the product page you are interested in and scroll down to the Outdoor Unit Data section. Most models will have the breaker size listed.<img src="https://uploads.gorgias.io/Q9r0k7BYaV2vg13y/undefined-f0de972c-7f60-4fc3-9dde-5f8a0ac8d3dd" style="width: 300px;" class="fr-fic fr-dib"><hr>2. Checking the Technical BrochureOn the same product page, navigate to the Technical Brochure section of the Manuals/Downloads section. Open the Technical Brochure that is given there.<img src="https://uploads.gorgias.io/Q9r0k7BYaV2vg13y/undefined-fb94d99d-9029-44a9-a207-7245b9eae360" style="width: 258px;" class="fr-fic fr-dib">Open the Technical BrochureFrom there, scroll the page that provides the technical data of the system. Locate your model, and find the 2 rows that show &quot;Minimum Circuit Ampacity&quot; and &quot;Max Fuse&quot;<img src="https://uploads.gorgias.io/Q9r0k7BYaV2vg13y/undefined-cab2890a-a185-442a-bf2a-2630fe53bf54" style="width: 445px;" class="fr-fic fr-dib">Minimum Circuit Ampacity is the lower limit that the breaker size can be, and Max Fuse is the upper limit. Usually, breakers come in sizes that end in 0 or 5, such as 20/25/30/35/40A.For a more detailed explanation, see below:<table class="fr-alternate-rows" style="width: 100%;"><tbody><tr><td class="fr-thick" style="width: 49.9279%;">Minimum Circuit Ampacity</td><td class="fr-thick" style="width: 49.9278%;">Max Fuse/Breaker</td></tr><tr><td style="width: 49.9279%; vertical-align: top;">This term refers to the minimum current carrying capacity of the circuit in which the appliance should be installed. It is specified to ensure that the wiring of the circuit can handle the continuous load that the appliance will place on it, thus preventing overheating of the wire, which could cause a fire. Ampacity is a term that combines &apos;ampere&apos; (a unit of electrical current) and &apos;capacity&apos;, implying the maximum amount of current a conductor can carry before its temperature exceeds a safe limit.&#xA0;</td><td style="width: 49.9278%; vertical-align: top;">This term refers to the maximum rating of the overcurrent protective device, like a fuse or circuit breaker, that should be used in the circuit with the appliance. This rating is given to ensure that in the event of a short circuit or other malfunction causing excessive current, the fuse will blow or the circuit breaker will trip, thus protecting the appliance and the circuit from damage.</td></tr></tbody></table>The key difference between these two terms is that the &quot;Minimum Circuit Ampacity&quot; is concerned with the normal, continuous operating current of the appliance and the capacity of the circuit wiring, while the &quot;Max Fuse/Breaker&quot; is concerned with protecting the appliance and circuit from abnormal, excessive current conditions. Both of these specifications must be adhered to when installing an electrical appliance to ensure its safe operation.Simply select the breaker that is compatible with the numbers given here.In the above example, a 20A or a 25A breaker is acceptable.&#xA0;<hr>3. Checking and confirming physically on the system itself prior to installationEven if you have found the information beforehand, it&apos;s always best practice to confirm this value once more when installing the system. The figure can be located on the outdoor unit for mini split installations, and both the outdoor and indoor unit for central split installations.&#xA0;<img src="https://uploads.gorgias.io/Q9r0k7BYaV2vg13y/undefined-3f8b885e-9618-400f-ac52-b4616d5479b6" style="width: 300px;" class="fr-fic fr-dib">An example from a mini split outdoor unit(Refer to #2 regarding the meaning of (Minimum Circuit Ampacity) MCA and Max Fuse.)Confirming on the system itself is best-practice, because of scenarios where online information may be outdated or inaccurate (in cases where a model was upgraded after ordering, or the wrong product page was looked at).Note that 120V models require a single-pole breaker, and 240V models require a double-pole breaker. Do not use &quot;Tandem Breakers&quot; on a 240V appliance, it will not work!<img src="https://uploads.gorgias.io/Q9r0k7BYaV2vg13y/undefined-0df6a08c-05c7-4320-bdb0-c77c6ce382d4" style="width: 385px;" class="fr-fic fr-dib"> <hr><h3 id="isPasted">Wire Size</h3>Once the breaker size and type is determined, the wire size is simple. In General, wire size will follow the table below. Confirm and comply with your local electrical codes prior to installation. When in doubt, call a licensed electrician.<table class="fr-alternate-rows" style="width: 100%;"><tbody><tr><td class="fr-thick" style="width: 50.0000%;">Breaker Size</td><td class="fr-thick" style="width: 50.0000%;">Wire Size (Based on Copper THHN wire)</td></tr><tr><td style="width: 50.0000%;">15 Amp</td><td style="width: 50.0000%;">14 AWG</td></tr><tr><td style="width: 50.0000%;">20 Amp</td><td style="width: 50.0000%;">12 AWG</td></tr><tr><td style="width: 50.0000%;">30 Amp</td><td style="width: 50.0000%;">10 AWG</td></tr><tr><td style="width: 50.0000%;">40 Amp</td><td style="width: 50.0000%;">8 AWG</td></tr><tr><td style="width: 50.0000%;">50 Amp</td><td style="width: 50.0000%;">6 AWG</td></tr></tbody></table> For outdoor unit wiring, it will typically be a 3-conductor wire (L1/L2/G for 240V units and (L/N/G for 120V units). Stranded and unshielded copper wire is recommended.The amperage rating of the wiring used must match with the breaker amperage. In other words, do not use a higher amperage rated breaker than the amperage rating of the cable used for that circuit.

How Do I Determine the Breaker Size and Wire Needed for a Pioneer HVAC System?

Mini splits are powered at the outdoor unit only. Every indoor unit that is connected to the outdoor unit will be powered by the outdoor unit via the communication cable that connects them together. The outdoor unit must be hard-wired to a dedicated

<h2 id="powering-a-split-system">Powering a Split System</h2>Mini splits are powered at the outdoor unit only. Every indoor unit that is connected to the outdoor unit will be powered by the outdoor unit via the communication cable that connects them together. The outdoor unit must be hard-wired to a dedicated circuit breaker to comply with NEC in most areas, using fuses of proper amperage and corresponding rated wire. A disconnect box as well as a surge protector are also highly recommended.<img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025050909-5dd5e6e6-5010-4f3b-836d-c7b14c241808-how_ductless_mini_split_works.png" style="width: 519px;" class="fr-fic fr-dib"> All systems use 3-conductor wire. The 110/120 (115V) systems are powered as Line, Neutral, and Ground (typically colored Black, White, and Green), while 208/240 (230V) systems are powered with two hot lines (Black and Red) and a Green ground (no neutral is used).Note that 115V system must use a single-pole breaker and 230V systems require a double-pole breaker. Tandem breakers are not allowed.Central (Ducted) Split systems are always 230VAC and require hardwiring both the outside condensing section as well as the indoor air handler unit to a dedicated breaker.

How is the System Powered?

For 230V systems, the system must receive a full 230V reading in order to function. Adding up 115V legs to ground does not work.

<h2 id="issue-the-indoor-air-handler-does-not-turn-on">Issue: The Indoor Air Handler Does Not Turn On.</h2><ul><li>Solution: Try the manual emergency button on the indoor unit, to rule out the remote.</li><li>Solution: Verify that the wire order is equal between indoor and outdoor units. Color order must match. Check for splices or damage on the control cable. To rule out variables, remove any accessorial items such as UV lights or condensate pumps until the problem is resolved.&#xA0;</li><li>Solution For 230V systems: Use a multi-meter to check AC voltage across terminals L1-L2 on the outdoor system (touch one probe to L1, the other probe goes on L2, do not meaure each leg to ground). Verify whether the reading is between 208~253 VAC.&#xA0;<ul><li>If the reading is between 208 and 253 VAC, measure whether the reading is the same across 2-3 on both the outdoor unit, and the indoor unit. All readings must match.&#xA0;</li><li>If the reading is 0 VAC, then the system is not receiving proper power from the power souce. Some common reasons are:&#xA0;<ul><li>A fused disconnect is being used, but fuses are blown or not inserted properly.</li><li>The disconnect box bus-bar is in the OFF position.&#xA0;</li><li>A double-pole breaker is not being used. Single or tandem breakers will not work.</li></ul></li></ul></li></ul><img src="https://attachments.gorgias.help/Q9r0k7BYaV2vg13y/hc/9JWjXVxG8m6DvMqm/2025031719-5cc1b806-d113-4fff-ae89-7db26281a4e4-230%20measuring.png" style="width: 300px;" class="fr-fic fr-dib">For 230V systems, the system must receive a full 230V reading in order to function. Adding up 115V legs to ground does not work.

The Indoor Unit Does Not Turn On

There is no real performance-difference between 115V and 230V versions of the same BTU capacity. It all comes down to what you have available or preference. We offer the 115V versions of 9000 and 12000 BTU single-zone wall mounts for those whose pane

<h2 id="what-is-the-difference-between-110120-115v-and-208240-230v-systems">What is the Difference Between 110/120 (115V) and 208/240 (230V) Systems? </h2>There is no real performance-difference between 115V and 230V versions of the same BTU capacity. It all comes down to what you have available or preference. We offer the 115V versions of 9000 and 12000 BTU single-zone wall mounts for those whose panels are limited in adding additional electrical breakers. 230V would generally run more electrically efficiently, but the electrical cost to run either is fairly even. If you have the option to install either, typically a 230V is a bit better as it offers an easier upgrade path and it permits you to use slimmer gauge wire which is a bit more cost effective.Only single-zone wall mounted ductless mini splits of 9 or 12 kBTU come with a 115V option. Other models such as light-commercial systems (cassettes and ductable units) as well as multi-zone models will all require 230VAC service.

Difference Between 120V and 240V Systems

Chat with one of our friendly reps to get help quick.

Something on your mind not found here? E-mail us.

We offer phone support if you don't want to type.

Support Center

Questions and guides related to the electrical aspects of Pioneer HVAC equipment

Electrical Related General Queries

General Technical Questions

Does the Fan Ever Shut Off in Cooling Mode?

Are Pioneer Systems Factory Pre-Charged with Refrigerant?

How to Check the Resistance of a Pioneer Temperature Sensor

I Have a Leak in My System But I Cannot Locate It

How to Locate a Pioneer Model Number or Serial Number

How to Apply Pioneer Flare Leak Guard

Pioneer Lineset Diameter Reference Guide

What Does It Take to Install a Mini Split?

What type of oil is used with the unit?

Why would a ductless mini split freeze up on the inside air handler if its cooling reasonably well, the filters are clean, and the level of refrigerant charge is proper?