Technical Data Sheet · Ultra High Temperature Heat Pump
SE-WWUHT Series
SE-WWUHT-50
Water-to-water single-cycle heat pump delivering pressurised hot water to 125 °C. R245fa, three-phase. Both sides are water — there is no air coil and no fan.
Heating capacity
49.7kW
At T1 · Rated duty
Peak COP
2.99
At T1 · Rated duty
Max water temp
125°C
Rated outlet
Cooling capacity
32.9kW
Simultaneous, at the rated duty
Performance
Rated output at each published test condition
T1
Rated duty
- Heating capacity
- 49.7kW
- Power input
- 16.6kW
- COP
- 2.99
- Water flow
- 8.6m³/hr
Technical specifications
SE-WWUHT-50| Parameter | Unit | Specification |
|---|---|---|
| Electrical supply | ||
| Power supply | — | 380~415 V / 50 Hz / 3 Ph |
| Rated input power | kW | 16.6 |
| Rated current | A | 34.27 |
| Refrigeration circuit | ||
| Compressor | — | Scroll (Xecom) |
| Number of compressors | Nos | 1 |
| Refrigerant | — | R245fa |
| Heat exchanger (condenser) | — | Brazed plate heat exchanger |
| Throttling device | — | Electronic expansion valve |
| Water circuit | ||
| Maximum water temperature | °C | 125 |
| Water flow | m³/hr | 8.6 |
| Water pipe size | inch | R1-1/2 |
| Rated pressure | bar | 2 |
| Unit & acoustics | ||
| Dimensions (L × W × H) | mm | 1550 × 780 × 850 |
| Net weight | kg | 400 |
| Noise at 1 metre | dB(A) | ≤ 62 |
Test conditions
- Rated duty — evaporator side in / out 60 / 55 °C, condenser side in / out 115 / 120 °C
Installation requirement
- Protection device and cable size are not published for this model. Confirm both with Sunniva before wiring — the rated current above is not sufficient to size them.
- Maintain water flow of 8.6 m³/hr through the unit.
Built to order
Options available on this modelOptions
- Water connection — Coupling type to suit the site — threaded, flanged or grooved.
- Casing — Stainless steel or powder-coated finish.
- Circulation pump — Can be built into the unit instead of being fitted in the plant room.
- Condenser — Stainless steel or copper, in place of the standard build.
How to order them
- None of the above is the standard build, and none of it is included in the specification table on this page.
- Ask for it at enquiry and have it confirmed in writing on the order acknowledgement. Price, lead time and weight can all change with it.
The table above describes the standard machine. Options are quoted per order and are available across the range except on the All-in-One and Split units.
Site installation schematic
How the source loop and the delivery loop connect on siteIndicative hookup only. Static head, draw pattern and local code may call for additional components — confirm the final scheme with Sunniva before ordering.
Selection & site preparation
Recommended sizing derived from this model’s rated dataSystem sizing
| Source loop flow | 8.6 m³/hr through the evaporator |
| Heat the source must give up | 32.9 kW at the rated duty. This is not optional — if the source cannot release it, the machine makes less heat than the nameplate. |
| Minimum source temperature | Confirm with Sunniva. The R245fa compressor window starts at 22 °C evaporating; too cold a source puts the machine outside its permitted envelope, not merely off its rating. |
| Delivery loop flow | 8.6 m³/hr through the condenser |
| Pipe size, both loops | R1-1/2 |
| Line insulation | Both loops, rated for 125 °C on the delivery side |
Civil & electrical
| Unit footprint & dry weight | 1550 × 780 mm · 400 kg |
| Plinth | 1700 × 930 × 150 mm RCC, M20 |
| Plinth level | 100 mm above finished floor, ± 3 mm/m |
| Clearances | 600 mm all round for service access. No air clearance is required — there is no fan. |
| Electrical | Not published for this model — confirm with Sunniva |
Installation steps
Follow in order — a commissioning engineer should sign off before start-up- Cast the plinth 1700 × 930 × 150 mm in M20 concrete, 100 mm above finished floor. Indoor or under cover; this machine does not need to see outdoor air.
- Set the unit on anti-vibration pads and level it to ± 3 mm/m.
- Pipe the source loop from the process return through an isolation valve, a Y-strainer and the circulating pump into the evaporator, and return it to the source. Size for 8.6 m³/hr.
- Pipe the delivery loop from the condenser to the process load and back, with an isolation valve, pressure indicator and a pressure relief valve on the flow. The circuit is pressurised — treat it as a hot water system, not a steam one.
- Fit an expansion vessel on each loop, sized to the loop volume and its working temperature. The delivery side runs at up to 125 °C.
- Fit a flow switch in each loop and interlock both to the compressor. Neither loop may be dry when the machine starts.
- Insulate both loops. The delivery side is a burn risk at 120 °C.
- Confirm the protection device and cable with Sunniva before wiring — they are not published for this model.
- On commissioning, prove the source can hold its temperature at full duty before signing off the heating output.
Process & instrumentation diagram
Refrigeration circuit, instrumentation and water connectionsInstrument schedule
Tags as marked on the diagram above| Tag | Device | Function |
|---|---|---|
| TT 01 | Compressor discharge temperature | Discharge superheat & high-temperature cut-out |
| TT 02 | Compressor suction temperature | Suction superheat monitoring |
| TT 03 | Water outlet temperature | Set-point control |
| TT 04 | Water inlet temperature | Return water sensing, ΔT calculation |
| PS HIGH | High-pressure switch | Discharge over-pressure cut-out |
| Tag | Device | Function |
|---|---|---|
| PS LOW | Low-pressure switch | Loss-of-charge / low-suction cut-out |
| PI HP | High-side pressure gauge | Discharge pressure indication |
| PI LP | Low-side pressure gauge | Suction pressure indication |
| FS 01 | Water flow switch | Interlock — no-flow lockout |
Cabinet reference drawing
Typical general arrangement — this model’s own dimensions alongside
Dimensions (L × W × H)1550 × 780 × 850 mm
Net weight400 kg
Reference arrangement only — Twin-compressor cabinet, vertical discharge. Dimensions printed on the
drawing are indicative; the figures above and in the specification table are the ones that
apply to this model.
Operating envelope
The compressor’s permitted window, in refrigeration termsEnvelope limits
| Evaporating temperature Te | 22 °C to 75 °C |
| Condensing temperature Tc | 75 °C to 135 °C |
| Peak condensing | 135 °C highest hot-water temperature the circuit can reach |
| Transient operation | Not applicable the envelope above is the continuous operating window |
Reading the envelope
- Te (evaporating) follows the source the unit draws heat from — the colder the air or source water, the lower Te sits.
- Tc (condensing) follows the water leaving the unit — asking for 80 °C hot water puts Tc near the top of the envelope.
- A duty is valid only inside the shaded area. A cold source combined with very hot water pushes the point towards the top-left, which is exactly where the envelope closes in — that corner is the real limit on winter performance.
Representative envelope for the R245fa circuit, redrawn from the Xecom / Embraco Nidec scroll compressor selection guide, “Operating Envelop”, XD*G panel. Envelope limits are broadly similar across compressor makes, so treat this as a representation of the circuit’s operating window. Where a duty sits close to a boundary, confirm against the compressor fitted to the unit before finalising the design.
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SE-WWUHT-50 · Technical Data Sheet. Specifications are subject to change without prior notice.