OLMO Multi-Sierra Outdoor • R454B • Multi-Zone
OLMO Multi-Sierra Outdoor — 27,000 BTU, R454B — OS-RMS27-230VO
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Summary
27,000 BTU/h cool & heat From 2–3 zones SEER2 23 · EER2 12.85 HSPF2 10.0 · COP2 3.60 R454B 208–230V 1Ph 5–125 °F cool · −13–75 °F heat
- High efficiency: SEER2 23 performance with inverter compressor control.
- Cold-climate heat: rated heating operation down to −13 °F ambient.
- R454B refrigerant: next-gen, lower-GWP option compared to legacy blends.
- Flexible piping: up to 82 ft per run and up to 230 ft total combined piping.
ModelOS-RMS27-230VO
ZonesFrom 2–3
EfficiencySEER2 23 · EER2 12.85 · HSPF2 10.0
Sound62 dB(A) outdoors
What's Included
- Outdoor condensing unit OS-RMS27-230VO
- Owner / installation documentation
Match with compatible Multi-Sierra indoor units and follow published line sizes and combination rules.
Tech Specs
| Spec | Details |
|---|---|
| Model | OS-RMS27-230VO |
| Cooling / Heating capacity | 27,000 / 27,000 BTU/h |
| SEER2 / EER2 | 23.0 / 12.85 |
| HSPF2 / COP2 | 10.0 / 3.60 W/W |
| Power | 208–230 V, 1-Phase, 60 Hz |
| Voltage range | 187–253 V |
| MCA / Max fuse | 25 A / 40 A |
| Refrigerant / Charge | R454B / 76.2 oz |
| Line sizes (liq/gas) | 1/4″ / 3/8″ |
| Max pipe length (each / total) | 82 ft / 230 ft |
| Operating range (cool / heat) | 5–125 °F / −13–75 °F |
| Outdoor airflow (Hi) | 3,357 CFM |
| Outdoor sound | 62 dB(A) |
| Unit size (W×H×D) | 38-3/8 × 32-7/8 × 14-1/8 in |
| Packing size (W×H×D) | 43-3/4 × 37-3/4 × 18-1/8 in |
| Net / Gross weight | 160.6 / 183.2 lb |
Ensure indoor combinations and total piping lengths remain within the rated limits for the selected zone mix.
Documents
Important
Install by a licensed HVAC professional. Register within 60 days. Verify indoor unit compatibility, pipe sizing, charge requirements, MCA/max-fuse, and ambient limits before startup.
FAQs
What line sizes does it use?
1/4″ liquid and 3/8″ gas per spec.
How cold can it heat?
Heating operation is rated to −13 °F ambient.
What are the power requirements?
208–230 V, single-phase, 60 Hz. MCA 25 A. Max fuse 40 A.
How many rooms can this do?
From 2–3 zones when paired with compatible Multi-Sierra indoor units.
