A technical framework for evaluating hybrid fan-coil heat-pump retrofits on existing two-pipe hotel systems—from operating logic and sample U.S. product data to hydronic, electrical, controls, and constructability requirements.
PerFitTech supports site investigation, basis-of-design development, product selection, controls, permitting coordination, pilot rooms, commissioning, and phased rollout.
PAFMAC combines a conventional hydronic fan coil with an inverter-driven heat-pump circuit. The room can use the water coil, the heat pump, or both, depending on loop condition and space demand.
Published values below describe example U.S. floor units. Final capacity, voltage, water flow, pressure drop, acoustics, dimensions, controls and code compliance must be confirmed for the selected model and project conditions.
PMAC USA describes four-season operation using the built-in compressor. In normal same-mode conditions, the water coil can satisfy or contribute to the load. When room demand opposes the loop, the heat-pump circuit provides the requested mode.
View PMAC USA system diagramsFan-coil cooling is available; the heat pump can supplement where the selected sequence and load require it.
The built-in water-source heat pump can operate in heating mode even while chilled water is being distributed.
Fan-coil heating is available; the heat pump can supplement for higher output under the selected operating sequence.
The reversible heat-pump circuit can provide cooling while hot water remains available to rooms requiring heat.
The table summarizes selected values from PMAC USA’s published PAFMAC brochure. Use it for preliminary screening only—not final selection or construction documents.
| Item | Unit | FFP17AA K | FFP27AA K | Engineering note |
|---|---|---|---|---|
| Cooling capacity · FCU | Btu/h | 3,800 | 6,500 | Rated hydronic fan-coil contribution. |
| Cooling capacity · FCU + HP | Btu/h | 8,600 (5,900–8,600) | 13,700 (8,900–13,700) | Published inverter range shown in parentheses. |
| Cooling with hot water | Btu/h | 3,500 (1,100–3,500) | 5,500 (1,500–5,500) | Opposite-mode cooling reference. |
| Heating capacity · FCU | Btu/h | 4,500 | 7,600 | Rated hydronic fan-coil contribution. |
| Heating capacity · FCU + HP | Btu/h | 9,600 (6,900–9,600) | 16,100 (11,000–16,100) | Published inverter range shown in parentheses. |
| Heating with chilled water | Btu/h | 3,800 (1,800–3,800) | 5,500 (1,900–5,500) | Opposite-mode heating reference. |
| Power source | V / phase / Hz | 208 / 1 / 60 | 208 / 1 / 60 | Published allowable voltage range: 180–220 V. |
| MCA / MOP | A | 8.9 / 10.0 | 8.4 / 10.0 | Coordinate branch circuit, disconnect and local code. |
| Air volume · H / M / L | CFM | 175 / 157.5 / 140 | 280 / 227.5 / 175 | Published floor-unit airflow. |
| Water flow | US GPM | 1.32 | 2.11 | Confirm diversity, balancing and pump operating point. |
| Water pressure loss | psi | 1.67 | 3.70 | Unit value only; add branch and accessory losses. |
| Water inlet temperature | °F | 41–122 | 41–122 | Rated examples: 44.6°F cooling and 113°F heating. |
| Water / drain connections | in. | ¾ NPT male / Ø1 drain | ¾ NPT male / Ø1 drain | Confirm handedness and field transition requirements. |
| Refrigerant charge | lb | R410A / 1.12 | R410A / 1.12 | Self-contained circuit; review applicable refrigerant code. |
| Main-unit dimensions · H × W × D | in. | 24-1/64 × 35-15/64 × 9-29/64 | 24-1/64 × 42-1/8 × 9-29/64 | Verify enclosure, access, clearances and service removal path. |
| Dimensions with decorative panel | in. | 24-51/64 × 50-63/64 × 10-15/64 | 24-51/64 × 60-5/8 × 10-15/64 | Published U.S. floor-unit cabinet dimensions. |
| Published low-fan acoustic criterion | NC | 30.5 | 32.0 | PMAC USA webpage value; verify test condition and room criterion. |
Specifications may change. Do not mix values from Japanese-market models with U.S. selections; voltage, certification, capacities and accessories can differ.
Primary source: PMAC USA, “PAFMAC Brochure,” published product data for FFP17/27AA K floor units.
Open brochureDesigned around common guest-room fan-coil applications, with left- and right-hand water-piping configurations published by PMAC USA.
Product pagePublished U.S. product families include ceiling configurations. Selection must address access, condensate, duct static pressure and ceiling coordination.
Product familyVertical-stack options support additional retrofit geometries; PMAC USA publishes an FTP47AA K cabinet approximately 86 × 16 × 16 inches.
Product pageA promising room-unit match is only the beginning. The qualification package must close the hydronic, electrical, architectural, controls, code and operational questions together.
PMAC USA publishes local operating modes, thermostat flexibility, pump interlock, reporting and fire-cutoff functions. PMS, BMS, BACnet or Modbus integration should be engineered around the selected controller and gateway—not assumed.
PerFitTech can work as the turnkey lead or alongside the owner’s consulting engineer, architect, controls contractor and installation trades.
Collect equipment schedules, as-builts, trend data, photos, room types and operating constraints.
Field-verify representative rooms, risers, piping, electrical, condensate, controls and access.
Reconcile loads, equipment performance, loop behavior, diversity, controls and constructability.
Use representative rooms to confirm fit, sequence, acoustics, installation method and guest-room finish.
Issue a repeatable package and phase installation around inventory, renovations and capital timing.
The product links below should be reviewed with current project-specific selections. PerFitTech can coordinate additional drawings, submittals and application engineering.
PerFitTech will help determine what is technically viable, what must change, and which information is still needed before the project advances to basis of design.