Name: Sunniva SE-SP-50U
Brand: Sunniva Encon LLP
SKU: SE-SP-50U

Performance

Rated output at each published test condition

T1 A25 °C / W30 °C

Heating capacity: 50kW
Power input: 7.4kW
COP: 6.7
Water flow: 23m³/hr

T2 A20 °C / W30 °C

Heating capacity: 42.8kW
Power input: 6.65kW
COP: 6.5
Water flow: 23m³/hr

T3 A15 °C / W30 °C

Heating capacity: 37kW
Power input: 6.75kW
COP: 5.5
Water flow: 23m³/hr

Technical specifications

SE-SP-50U

Technical specifications for SE-SP-50U
Parameter	Unit	Specification
Electrical supply
Power supply	—	380~415 V / 50 Hz / 3 Ph
Rated current	A	16
Maximum input power	kW	11
Maximum current	A	23
Required MCB	—	40 A × 4 pole
Required cable	—	4 core × 10 sq.mm copper cable + earthing
Refrigeration circuit
Compressor	—	Scroll (Copeland / Panasonic)
Number of compressors	Nos	2
Refrigerant	—	R410A
Heat exchanger (condenser)	—	PVC shell titanium condenser
Evaporator	—	Blue finned evaporator coil
Throttling device	—	Electronic expansion valve
Fan quantity	Nos	2
Fan discharge	—	Vertical
Water circuit
Maximum pool water temperature	°C	45
Water flow	m³/hr	23
Water pipe size	inch	Rc2
Unit & acoustics
Dimensions (L × W × H)	mm	1450 × 890 × 1110
Net weight	kg	320
Noise at 1 metre	dB(A)	≤ 66

Test conditions

T1 — Ambient 25/20 °C (DB/WB), E.T. 15 °C, C.T. 35 °C
T2 — Ambient 20/15 °C (DB/WB), E.T. 10 °C, C.T. 35 °C
T3 — Ambient 15/10 °C (DB/WB), E.T. 5 °C, C.T. 35 °C
T4 — Ambient 10/7 °C (DB/WB), E.T. 0 °C, C.T. 35 °C

Installation requirement

Dedicated 40 A × 4 pole MCB required at the unit.
Supply cable 4 core × 10 sq.mm copper, with separate earthing.
Maintain water flow of 23 m³/hr through the unit.

Built to order

Options available on this model

Options

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.

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 unit connects to the pool, filter and pump set on site

Heated water to poolPool water to filterBackwash / drainElectrical & control

1Heat pump unit
2RCC foundation with anti-vibration pads
3Swimming pool
4Circulation pump
5Sand / cartridge filter — always upstream of the heat pump
6Hair-and-lint strainer
7Non-return valve
8Skimmer suction
9Main drain suction
10Return inlet jets
11Pool water sensor to heat pump controller
12Chemical dosing point — downstream of the exchanger only
13Backwash / drain valve
14Power supply / MCB panel

Indicative 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 data

System sizing

Rated heating capacity	50 kW at T1
Design flow through the unit	23 m³/hr
Pool volume served	Sized on surface area, cover, wind exposure and required heat-up time — confirm with Sunniva before ordering.
Filtration	Full-flow sand or cartridge filter upstream of the heat pump; turnover 4 – 6 hours
Hydraulic connection	Three-valve bypass on the Rc2 (50 mm) circuit, set to the design flow
Chemical dosing	Downstream of the exchanger only, never between filter and unit

Civil & electrical

Unit footprint & dry weight	1450 × 890 mm · 320 kg
Heat pump plinth	1600 × 1040 × 150 mm RCC, M20
Plinth level	100 mm above finished floor, ± 3 mm/m
Position	Outdoors, clear of the pool surround splash zone, condensate drained away from the deck
Clearances	700 mm air-on · 1200 mm above fan · 800 mm service side
Electrical	40 A × 4 pole MCB · 4 core × 10 sq.mm copper cable + earthing

Installation steps

Follow in order — a commissioning engineer should sign off before start-up

Cast the RCC plinth 1600 × 1040 × 150 mm in M20 concrete, 100 mm above finished floor and clear of the pool surround. Check it is level within 3 mm per metre.
Set the unit down on anti-vibration pads. Keep 700 mm clear at the finned coil faces and 1200 mm above the fan. The unit sheds cold air and condensate — drain both away from the deck.
Take pool water from the skimmer and main drain through the hair-and-lint strainer to the circulation pump.
Pipe pump → filter → heat pump. The filter must always sit upstream: debris through the titanium exchanger will foul it.
Fit a three-valve bypass around the unit on the Rc2 (50 mm) line so flow can be trimmed to 23 m³/hr and the unit isolated for service.
Return heated water to the pool through the inlet jets. Fit a non-return valve on the return leg.
Place the chemical dosing point downstream of the heat pump. Dosing upstream will destroy the exchanger and voids the warranty.
Fit the pool water sensor in the return line and run its cable back to the controller, away from the power cable.
Power the unit from a dedicated 40 A × 4 pole MCB using 4 core × 10 sq.mm copper cable + earthing.
Balance the water chemistry before first start: pH 7.2 – 7.8, free chlorine below 3 ppm, salt below 5000 ppm.
Run the circulation pump, confirm the flow switch stops the unit when flow is lost, then start the heat pump.

Process & instrumentation diagram

Refrigeration circuit, instrumentation and water connections

Discharge / hot gasLiquid lineSuction vapourWater circuitAir flowTTTemperature transmitterPSPressure switch (HP / LP)PIPressure indicatorFSWater flow switch

Instrument 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

Reference general-arrangement drawing, Twin-compressor cabinet, vertical discharge

Dimensions (L × W × H)1450 × 890 × 1110 mm

Net weight320 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.

COP characteristic

Full performance map across the operating envelope

COP · heating duty COP against ambient temperature, one curve per hot-water outlet temperature

COP (kW/kW) by ambient temperature and hot-water outlet temperature
COP · hot water ↓ / Ambient °C →	-12	7	10	15	20	25	30	35
45 °C	2.61	4.14	4.41	4.71	5.02	5.26	5.52	5.79
50 °C	2.39	3.79	4.04	4.31	4.60	4.82	5.05	5.30
55 °C	2.19	3.47	3.70	3.95	4.21	4.41	4.63	4.85
60 °C	1.98	3.14	3.35	3.57	3.81	4.00	4.19	4.40

How to read this

Performance map for the R410A circuit. Rated figures at the certified test conditions are on page 1.
Where a figure on this map differs from the rated point on page 1, the map governs — it is measured across the full operating envelope, while the rated point is a single certified test condition.

Operating envelope

The compressor’s permitted window, in refrigeration terms

Operating envelope · R410A circuit Condensing against evaporating temperature — the compressor’s permitted operating window

Envelope limits

Evaporating temperature Te	−25 °C to 25 °C
Condensing temperature Tc	20 °C to 67 °C
Peak condensing	67 °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 R410A circuit, redrawn from Panasonic compressor data (Operating envelop.xlsx, sheet “R410a”). 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.