Frequently Asked Questions

Explore our FAQs to learn more about maximizing the efficiency and effectiveness of your Boreal Split System.

Common Questions

  • Cycle system off and on (Reset both outdoor and indoor units)
  • Clean air filters, check for dirty indoor coil
  • Any obstructions from outdoor coil
  • Remote control batteries

  • The remote control should come from the factory already set for °F, but if set for °C, turn remote control off, then press "MODE" and " ▼ " buttons on the remote simultaneously for 5 seconds.

  • The unit can be turned on/off by lifting the panel on the Indoor Unit and pressing button on lower right hand side. The temperature cannot be changed and the unit will only operate in the "Auto" Mode.

  • Many Boreal part #'s vary by 2-3 digits. This does not mean they are interchangeable, each part # has its own unique properties.
  • When looking for individual parts, check parts diagrams to see if that part is also a component of an assembly or sub-assembly.
  • For warranty purposes, always select the individual part number first. If that part is not in stock, there may be a component of an assembly or sub-assembly that is available.

  • Line sets come charged with nitrogen to keep contaminants out. They are, not charged with refrigerant. Boreal OD units contain enough R410A fo, generally, up to a 25 foot line set on most 1 to 1 systems but always check submittals.
  • For MULTI systems, the outdoor unit is charged for up to 131' of line set.

  • 10' minimum required for all models, (this does not include the 2' section on the IDU)

  • 65' accumulative max.
  • Pre-charged to 33'.
  • Maximum run per evaporator: 33'.
  • Add .2 oz. per additional foot over 33' not to exceed 65' accumulative total.
  • 197' accumulative max.
  • Pre-charged to 98'.
  • Maximum run per evaporator: 65'.
  • Add .2 oz. per additional foot over 98' not to exceed 197' accumulative total.
  • 230' accumulative max.
  • Pre-charged to 131'.
  • Maximum run per evaporator: 82'.
  • Add .2 oz. per additional foot over 131' not to exceed 230' accumulative total.
  • 246' accumulative max.
  • Pre-charged to 131'.
  • Maximum run per evaporator: 82'.
  • Add .2 oz. per additional foot over 131' not to exceed 246' accumulative total.
  • 246' accumulative max.
  • Pre-charged to 131'.
  • Maximum run per evaporator: 82'.
  • Add .2 oz. per additional foot over 131' not to exceed 246' accumulative total.
  • All pre-charged to 25'.
  • 9K max run 49'.
  • 12K max run 66'.
  • 18K max run 82'.
  • 24K max run 82'.
  • 30K max run 98'.
  • 36K max run 98'.
  • Add .2 oz. per foot over 25' not to exceed stated max.
  • 9K (115V) max run 49'.
  • 9K (230V) max run 49'.
  • 12K (115V) max run 66'.
  • 12K (230V) max run 66'.
  • 18K max run 82' 24K max run 82'.
  • 30K max run 98'.
  • 36K max run 98'.
  • Add .2 oz. per foot over 25' not to exceed stated max.

  • Line sets include 14/4 AWG wiring [for communication and power]
  • Line sets are available in 15', 25', 35', 50 and 75' lengths. Larger lengths must be field-supplied.
  • Line sizes cannot be increased to accommodate longer line set runs
  • Insulate both lines separately (this is usually a moot point as pre-flared ‘packaged' line sets come with the two lines insulated separately but in Canada and some other areas it is customary to create your own line set and, in these cases, it is important to insulate the lines separately).
  • Mini Split AC's have one service port, on the low side. The liquid line is actually a discharge vapor line because the expansion valve is in the ODU, (if you are asked why we don't put a three-way valve on the discharge line this is the reason.)
  • Use nitrogen to pressure test line set to 500 PSI. Release nitrogen if no leaks and pull a vacuum to 500 microns.
  • Always weigh in refrigerant, do not charge to pressure and/or temperature
  • When mounting on an exposed wall you can push the flare connections out the wall and make your flare connections on the exterior…this is often easier when trying to make the flare connections between the IDU and the wall.
  • Do not use leak lock but do use Nylog Blue on the flare connections
  • Only trap line set when the ODU is 30' higher than the IDU and then trap every 20'
  • All BOREAL mini split systems contain R410A refrigerant

  • IDU should be mounted at least 72" up off the floor or 6" off the ceiling with 6" of clearance on both left & right sides
  • All electrical connections are on the right side of the wall mounted units.
  • When pulling the line set in through the hole in the wall, be sure to maintain a 4" bend radius to keep the line set tight against the interior wall and prevent kinking
  • Installation bracket must be level.
  • Try to catch two wall studs with the legs of the mounting bracket but if not the five screws provided with appropriate wall anchors will keep the evaporator on the wall... IDUs weigh approx. 22 - 42lbs.)
  • IDUs have as much as a 40' throw of air
  • The wireless remote must be within 26 feet of the IDU and must have a clear communication to the IDU…cannot go through sheet rock, etc.
  • Use expandable foam to seal hole around line set and drain (wall sleeves are nice too)
  • Ceiling cassettes come with a factory condensate pump
  • MULTI indoor units are powered off the outdoor unit
  • Indoor High-Wall fans run continuously in the Cool mode.
  • Dry mode on IDU can be used for dehumidification
  • Both the IDU & ODU units must be level in order for water to drain properly

  • Do not add any driers, sight glasses, crankcase heaters, hard start kits and low ambient controls.
  • Do not use a drain fitting with the ODU because of potential freezing. (in freezing climates only…obviously)
  • Both the IDU & ODU units must be level in order for water to drain properly
  • 2' clearance from the top, 2' right side, 1' left side, 6 ½' discharge (air outlet), and 1' incoming (air inlet) air side (refer to product documentation)
  • ODU must be located on level ground and above the typical snow line
  • 14/4 AWG stranded cooper wire 600v rated is required between the ODU & IDU
  • There can be no breaks (splices) in the cable between the ODU and IDU. No wire nuts / no splicing of any kind!
  • The wire connected to terminal #1 on the ODU must be connected to terminal #1 on the IDU, #2 to #2, #3 to #3 and #4 to #4.
  • If you get an E6 error code the wires maybe crossed between the ODU & IDU
  • Surge protectors are recommended (Intermatic AG3000)
  • Indoor disconnect is required (this is in the U.S. National
  • Electrical Code but often not enforced by local code officials)
  • Do not put control wires around, close to or on top of lights
Wall Bracket
  • Mini Split distance off the wall being 12" or 20" off wall for air inlet that Boreal installation guide requires.
  • Consult wall bracket installation guide and submittal for distance off wall for air inlet, sides, top and bottom of unit, as long as more than 20" off ground. This allows inlet air from bottom, top and both sides of the outdoor unit so the inlet requirement of 12" or 20" can be reduced.

  • The drain lines do not have to be trapped
  • For best draining of condensate, run the drain line below the line set.
  • A 5° downward pitch is recommended leaving the IDU unit for gravity draining.
  • There is a drain port on the IDU on both right side and left side.
  • Use terminals 1 & 3 on the IDU to power the condensate pump if the pump is installed inside the IDU.
  • Wire mini-split condensation pump to Boreal unit Terminals N1 and 3 on the indoor unit to power the pump.
  • Terminal 2 on the indoor should not be used to wire in pump or safety switch as this is dedicated communication.
  • Terminal 3 is often used for safety switch to cut power to the indoor unit rendering it non-functional.

  • The Electronic Expansion valves EEV are in the ODU
  • The error code that is most common, (E6) is caused by a fault with the communication wiring

WiFi Kit
  • The EWPE application is the Universal WiFi App that controls your system from anywhere if your unit is equipped from the factory with the WiFi Module or has had a WiFi kit field installed.
  • Part number for WiFi Kit, sold separately. 230 Volt Units: Kit # WSBEC04. 115 Volt Units: Kit # WSBEC03
  • Number of indoor units can connect to WiFi: 4 indoor units
  • The WiFi connects to the equipment with blue molded plug and the indoor unit has blue molded plug in control panel of the indoor and will plug together.
  • The white molded plug located with the blue molded plug is for wall mount control that comes with the indoor.
Troubleshooting WiFi Connection
  • May have wrong app loaded - the BorealSmart app is only app that will work with WiFi
  • Could need to Refresh the App
  • G-Life app is for Crown rev (A) & Crown rev (B) RF remote

Error Codes

  • Common causes include overcharge, dirty coils, failed fan motors, or a faulty high-pressure switch.
  • First, check for overcharge and ambient temperature.
  • Ensure wires to indoor units are correctly matched if it's a MULTI system.

  • Check refrigerant charge.
  • Inspect the EEV for proper metering.
  • Examine filter dryers for temperature discrepancies.

  • Verify line voltage from breaker L1 & L2.
  • Inspect for a dirty evaporator coil.

  • Start diagnostics at the outdoor unit for voltage checks.
  • Check indoor units for communication voltage.
  • Test with a temporary replacement cable.
  • If wiring is good, the indoor control board may have failed.

  • Ensure the system is not low on refrigerant.
  • Check that coils are clean and fans are functional.
  • Compare indoor coil thermistor readings against the Ohm chart.

  • Mode-dependent high pressure can indicate several issues.
  • Check for loose or broken wires and sensor functionality.

  • Replace the indoor board and transfer the jumper.
  • Inspect the jumper for damage or incorrect placement.

  • All units need to be set to the same mode, either Heat or Cool.

  • This indicates a compatibility issue between indoor and outdoor units.

  • This is not an error; it indicates the system is turned on.
  • Visible on the UMAT control board display.

  • Check for any wiring issues to the board.
  • Verify compressor and fan motor resistance.
  • If components are operational, the outdoor board may need replacing.

  • Ensure line voltage stability within the specified range.
  • Perform voltage checks at the DC bus bar.
  • Replace the outdoor Main Board if necessary.