Mini Split Wiring | Information by Electrical Professionals for ...
WEBApr 30, 2023 · May 1, 2023. #11. Issue happening with the mini splits I've seen is that there is no neutral connection inside the exterior main unit that is only 240V (normal on original type hvac) yet the interior power heads are 120V, powered from the main unit. This forces the neutral current onto the ground, thus tripping the gfci.
Another disconnecting means on mini splits thread...
WEBAug 17, 2023 · SFR, Los Angeles. Owner wanted an 8-unit Mitsubishi mini split system. Inspector insisting on a disconnect for each interior unit, despite the electrician offering a lockable disconnect on the outdoor unit which powers all of the indoor units (indoor units are that 3 conductor 110V system that carries power and data from the outdoor unit).
mini split interconnect cable and MC inners | Information by …
WEBAug 20, 2020 · WAC 296-46B-336 Power and control tray cable—Type TC. 010 Uses permitted. In addition to the uses allowed in NEC 336.10, Type TC cable may be used in any location allowed for nonmetallic-sheathed cable in NEC 334 if all the installation requirements in NEC 336 and 334 and WAC 296-46B-334 are met.
Mini Split Cable to Indoor Units & OCP | Information by Electrical ...
WEBJun 26, 2024 · I can't recall connecting any mini split systems that needed more than 20 amp breaker, in fact most if all only needed a 15 amp breaker. I've done a larger scale VRF system before with multiple compressors some on 60 or even 80 amp three pole breakers, but the zone valves and room air handling units …
Use 10-3 NM-B vs 10-2 NM-B for outdoor mini-split condenser
WEBNov 30, 2020 · Per NEC is it acceptable to pull 10-3 NM-B when only a 10-2 NM-B cable is needed at this time? I understand that the 10-3 provides the "extra" hot (red) conductor, but what does NEC say about the "spare" wire in the cable that is not needed? Cap the white conductor at both ends of the 10-3...
Duct Smokes & Ductless Split HVAC Systems & Fire Alarm
WEBJun 20, 2013 · We have approved plans for a manual fire alarm system with notification throughout in a restaurant, A-3 occupancy. The plans show connections to duct smoke detectors provided by the HVAC contractor & fire alarm relays for HVAC shutdown. Today we learned that the HVAC units are ductless split...
Residential Service Load Calculations using high BTU Mini Split …
WEBMar 31, 2020 · Each mini split has the inside fan, outside fan, controls, and compressor all in its nameplate MCA. So you can't just take 80% of it to get the true load without the 125% factor on the compressor. 90% may be closer but even then you're guessing unless each item in the minisplit has a nameplate amp value so you can derive everything.
Mini-Split wire | Information by Electrical Professionals for ...
WEBFeb 1, 2020 · One of the electrical contractors is asking us to run the communication wire alongside out line set without any conduit. The other stated that this will not pass the electrical inspection and that it needs to be run separately and in conduit. This communication wire is a 14/3 that carriers 208VAC from the condenser to the head unit.
Mini split wiring | Information by Electrical Professionals for ...
WEBLos Angeles CA. Aug 29, 2018. #19. MattS87 said: So I just completed my 2nd mini split install and have a question about the wiring. The first one was done about 3 1/2 yrs ago and after completing the wiring the HVAC company said we had to re-pull #14 from the outdoor unit to the indoor units ( we had run #12 as it was a 20A circuit).
Split A/C Systems and Local Disconnect Requirements
WEBFeb 10, 2023 · When the indoor unit of a split-system A/C unit gets power from the outdoor condensing unit, does the indoor unit require a local disconnect switch if the outdoor unit has a lockable disconnect switch?