Senville Aura

Senville Aura 18000 vs 24000

• SEER 21.5 for Aura 24000:

• Up to 22.5 for Aura 18000 cooling, but lower for heating:

• Aura 9000 is good for 400 sf. $200 heating bill, $60 cooling bill.
• Senville 18000 is good for 1000 sf, 5.2 kW, $395 heating, $112 cooling bill. [1]
• Senville 12000 is good for 700 sf. $239 and $81 heating and cooling bills. [2]

Installation

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Installation

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Learnings

• We should actually consider Senville Leto 18000 - recommended for up to 1100 sf [3]. Cheaper. Or Senville Aura 18000 - only up to 1655 W! Easier to power.
• 20A wire and breaker for Aura 18000 [4]
• Senville Aura 24000 is up to 1400 sf. But power is up to 2500W for heat, 1920W for cooling. 135 lb outdoor unit weight. Senville Leto is only 80 lb outdoor unit weight.

Notes

• Buy - Senville SENA-24HF-Q -[5]
  • Outside power unit - uses 10/2 wire, 30A fuse [6]
  • Controversy - H07RN-F [7] (outdoor unit) is 4 wire - how does that agree with 10/2? at [8]. This says you can use 10/2 [9]. Question: why is supply 10/2 and cable on unit 4-wire? Solution: H07RN-F comes in 3 wire as well.
  • Cable to inner unit - 14 gauge 4 wire for the power to inside unit - the running amps is only 11 at 230V
• Cooling (Range) 6850~27000 Input (W) 1845 - Rated current A 8.1
• Heating (Range) 11900~31000 Input (W) 2500 Rated Current (A) 10.9
• COP W/W 3.4 - SEER 21.5. $155/$405 cooling/heating costs per year
  • Compared to Lennox highest efficiency 24k btu model at about $1000 higher cost (looks like AC only) - more efficient unit does not save money in overall cost because electricity use savings are offset by the higher unit price ($1000 higher price for Lennox SL28XCV Series [10])
• Minimum Circuit Ampacity (A) 25 - to provide startup current
• Max. Fuse (A) 35
• It is not clear whether tubing can be left coiled - [11]. Install manuals say so - one of the diy systems with precharged line sets there instructions specifically state to coil the excess at the system. - but author speculates that since lubricating oil is also carried with refrigerant, there could be an issue.
  • This link says coiling is ok (see comments) [12]
  • Manufacturers state it is ok. Installers say 'install it properly by cutting to size'. Who do you trust? [13]
  • 5-10' coiled - works 3 years running [14]. Other guys in same thread say that coiling will fail after some time. If coiled, lay them out horizontally.
  • Inspectors say any oil trap is not good. If coil, do so horizontally - [15]
  • Summary - shorten line set and adjust charge. Coiling may work according to manufacturer. Interpretation - if manufacturers say it's ok, it should be ok because if they misled the public, they would go out of business. Assuming manufacturers have integrity, we are ok. [16]
• First principle calculations say - Say there is 8 feet of coil left.
• Tech assist - 'Nel

we are not able to confirm this to you, i would highly suggest you reach out to Senville directly at (800) 242-4935. They will be able to provide technical assistance'

Key Videos

• Point - disconnect vacuum After filling up low pressure side with 1 PSI of refrigerant- [17]
  • 1 lb? Not 1 atm? Under 1 lb, 14 psi of atmosphere would mean that air actaully leaks into the tubing.
  • Note that instructions say to 'let in refrigerant for 5 seconds with quarter turn of valve' - steps 9-10 on page 30 of manual [18]. This is not correct - we should look at the actual valve, no? Video says 1 lb - also not correct. The right way should be to look at the valve, not by time - but by when valve reads a little above atmospheric pressure of 14 psi.

Manual

https://store-2tb0afw6nn.mybigcommerce.com/content/manuals/downloads/aura-series-installation-manual.pdf

R-410A - Refrigerant

• https://www.rses.org/assets/r410a/R-410A.PDF
• Pressure-Temperature chart is shown at end of PDF above

Build Pictures

• [19]

Specs

Heat pump for heating and cooling that works down to -20F. 7kW of heat.

https://www.sylvane.com/senville-aura-24000-btu-mini-split-heat-pump.html?_srt=ssr&keywords=Senville%20Aura%2024,000%20BTU%20Mini%20Split

Mounting Bracket

• $70 - [20]

Troubleshooting

• Vacuum doesn't draw down - [21]
• Notes - https://youtu.be/rHkJbU1NGMg?t=497

It says that once you connect the lines, you can't disconnect them (they depressurize). You said you connected the lines to the wrong port and then disconnected them to correct. The lady on the video says you need to get a professional to recharge the lines. In our case it may be simpler to get new lines:

https://www.homedepot.com/p/Pioneer-Copper-Piping-Kit-for-Mini-Split-Installation-1-4-in-1-2-in-10-ft-PKW-1-4-1-2-10/314278851?MERCH=REC-_-pip_alternatives-_-206051174-_-314278851-_-N&

https://www.homedepot.com/p/Pioneer-Copper-Piping-Kit-for-Mini-Split-Installation-1-4-in-3-8-in-10-ft-PKW-1-4-3-8-10/314213288?MERCH=REC-_-pip_alternatives-_-206051174-_-314213288-_-N&

Or call the manufacturer to check if that's what happened :)