OLMO Multi-Sierra Outdoor • R454B • Multi-Zone
OLMO Multi-Sierra Outdoor — 18,000 BTU, R454B — OS-RMS18-230VO
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Highlights
18,000 BTU/h cool & heat Up to 2 zones SEER2 22 · EER2 13.33 HSPF2 10.0 · COP2 3.82 R454B 208–230V 1Ph 5–125 °F cool · −13–75 °F heat
- Multi-zone flexibility: supports up to 2 independent zones with compatible indoor units.
- High efficiency: inverter-driven performance rated up to SEER2 22.
- Cold-climate heating: rated heating operation down to −13 °F.
- Jobsite friendly: compact footprint and a 55 dB(A) outdoor sound rating.
ModelOS-RMS18-230VO
ZonesUp to 2
Sound55 dB(A)
Lines1/4″ liquid · 3/8″ gas
What's Included
- Outdoor unit OS-RMS18-230VO
- Owner / installation documentation
Pair only with compatible OLMO Multi-Sierra indoor units. Observe line sizes and length limits.
Tech Specs
| Spec | Details |
|---|---|
| Model | OS-RMS18-230VO |
| Zones supported | Up to 2 independent zones |
| Cooling / Heating capacity | 18,000 / 18,000 BTU/h |
| SEER2 / EER2 | 22.0 / 13.33 |
| HSPF2 / COP2 | 10.0 / 3.82 W/W |
| Power | 208–230 V, 1-Phase, 60 Hz |
| MCA / Max fuse | 21 A / 30 A |
| Outdoor airflow (Hi) | 1,850 CFM |
| Outdoor sound | 55 dB(A) |
| Unit size (W×H×D) | 33.88 × 26.38 × 12.25 in |
| Packing size (W×H×D) | 39 × 28.75 × 17.75 in |
| Net / Gross weight | 101.4 / 112.4 lb |
| Refrigerant / Charge | R454B / 51.15 oz |
| Line sizes (liq/gas) | 1/4″ / 3/8″ |
| Max pipe length (each / total) | 82 ft / 164 ft |
| Operating range (cool / heat) | 5–125 °F / −13–75 °F |
Documents
Important
Install by a licensed HVAC professional. Register within 60 days. Confirm indoor unit mix, MCA/max-fuse, pipe lengths, and ambient limits before commissioning.
FAQs
How many zones can this support?
Up to two independent zones with compatible OLMO Multi-Sierra indoor units.
What line sizes are required?
1/4″ liquid and 3/8″ gas.
What are the power requirements?
208–230 V, single-phase, 60 Hz. MCA 21 A. Max fuse 30 A.
What are the piping limits?
Up to 82 ft per run and 164 ft total, within system design limits.
