Name: Sunniva SE-HT-70V
Brand: Sunniva Encon LLP
SKU: SE-HT-70V

Performance

Rated output at each published test condition

T1 A20 °C / W60 °C

Heating capacity: 69.8kW
Power input: 17kW
COP: 4.1
Hot water output: 1500LPH

T2 A20 °C / W70 °C

Heating capacity: 65.2kW
Power input: 19.6kW
COP: 3.3
Hot water output: 1120LPH

T3 A20 °C / W80 °C

Heating capacity: 61.2kW
Power input: 22.7kW
COP: 2.7
Hot water output: 880LPH

Technical specifications

SE-HT-70V

Technical specifications for SE-HT-70V
Parameter	Unit	Specification
Electrical supply
Power supply	—	380~415 V / 50 Hz / 3 Ph
Rated current	A	42.4
Required MCB	—	80 A × 4 pole
Required cable	—	4 core × 25 sq.mm copper cable + earthing
Refrigeration circuit
Compressor	—	Scroll (Copeland / Panasonic)
Number of compressors	Nos	2
Refrigerant	—	R134A
Heat exchanger (condenser)	—	Tube-in-shell / Brazed plate heat exchanger
Evaporator	—	Blue finned evaporator coil
Throttling device	—	Thermostatic / Electronic expansion valve
Fan quantity	Nos	2
Water circuit
Rated water temperature	°C	75
Maximum water temperature	°C	80
Water flow	m³/hr	12.2
Water pressure drop	kPa	≤ 70
Water pipe size	inch	R2
Unit & acoustics
Dimensions (L × W × H)	mm	1850 × 950 × 1635
Net weight	kg	610
Noise at 1 metre	dB(A)	≤ 78

Test conditions

T1 — Ambient 20/15 °C (DB/WB), E.T. 10 °C, C.T. 65 °C
T2 — Ambient 20/15 °C (DB/WB), E.T. 10 °C, C.T. 75 °C
T3 — Ambient 20/15 °C (DB/WB), E.T. 10 °C, C.T. 85 °C

Installation requirement

Dedicated 80 A × 4 pole MCB required at the unit.
Supply cable 4 core × 25 sq.mm copper, with separate earthing.
Maintain water flow of 12.2 m³/hr; pressure drop across the unit ≤ 70 kPa.

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.
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 unit connects to the tank, pumps and piping on site

Hot waterReturn to heat pumpCold water feedRecirculation returnElectrical & control

1Heat pump unit
2RCC foundation with anti-vibration pads
3Insulated storage tank
4Primary circulation pump
5Y-strainer
6Non-return valve
7Isolation valve (typical)
8Automatic air vent
9Safety / pressure-relief valve
10Tank sensor to heat pump controller
11Drain valve
12Cold water feed
13Hot water to usage points
14Recirculation (return-line) pump
15Thermometer
16Power 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

Storage tank volume	3000 – 9000 L
Tank sizing rule	Hot water output × 2 to 6 LPH measured at 20 °C ambient. Indicative range — stay inside it so the tank is neither undersized nor oversized.
Primary circulation pump	13 m³/hr @ 10 – 12 m head
Recirculation (return) pump	1.5 – 1.8 m³/hr @ 6 – 8 m head
Primary pipe size	50 mm (R2) to 10 m run; 65 mm beyond
Line insulation	25 mm closed-cell, every line above 45 °C

Civil & electrical

Unit footprint & dry weight	1850 × 950 mm · 610 kg
Heat pump plinth	2000 × 1100 × 150 mm RCC, M20
Plinth level	100 mm above finished floor, ± 3 mm/m
Tank pad (3000 L)	150 mm RCC, 200 mm larger each side ≈ 3450 kg filled
Clearances	1000 mm air-on · 1500 mm above fan · 1000 mm service side
Electrical	80 A × 4 pole MCB · 4 core × 25 sq.mm copper cable + earthing

Installation steps

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

Cast the RCC plinth 2000 × 1100 × 150 mm in M20 concrete, 100 mm above finished floor. Let it cure and check it is level within 3 mm per metre.
Set the unit down on anti-vibration pads. Keep 1000 mm clear at the finned coil faces and 1500 mm above the fan — the unit must breathe or capacity drops.
Place the tank on its own level pad, as close to the heat pump as the site allows. Short pipes lose less heat.
Pipe tank bottom → isolation valve → Y-strainer → primary pump → heat pump inlet, in that order. Fit the non-return valve after the pump.
Pipe the heat pump outlet → tank top inlet. Fit an isolation valve at each end so the unit can be serviced without draining the tank.
Fit the automatic air vent and the safety valve on the tank top. Pipe the safety valve discharge to an open drain — never cap it.
Bring the cold water feed into the tank bottom through an isolation valve and a non-return valve.
Fit the tank sensor into the tank pocket and run its cable back to the heat pump controller. Do not run it alongside the power cable.
Insulate every hot line with 25 mm closed-cell insulation, pump body included.
Power the unit from a dedicated 80 A × 4 pole MCB using 4 core × 25 sq.mm copper cable + earthing.
Fill and vent the system fully. Confirm the flow switch stops the unit when the pump is off, then start.

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, V-coil cabinet, vertical discharge

Dimensions (L × W × H)1850 × 950 × 1635 mm

Net weight610 kg

Reference arrangement only — V-coil 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 →	0	5	10	15	20	25	30	35	43
45 °C	3.65	3.90	4.17	4.46	4.77	5.00	5.24	5.50	5.76
50 °C	3.34	3.58	3.82	4.09	4.37	4.58	4.80	5.03	5.28
55 °C	3.06	3.27	3.50	3.74	4.00	4.19	4.40	4.61	4.84
60 °C	2.77	2.97	3.17	3.39	3.62	3.80	3.98	4.18	4.38
65 °C	2.51	2.69	2.87	3.07	3.28	3.44	3.61	3.78	3.97
70 °C	2.28	2.43	2.60	2.78	2.97	3.12	3.27	3.43	3.59
75 °C	2.06	2.20	2.36	2.52	2.69	2.82	2.96	3.10	3.25
80 °C	1.87	2.00	2.13	2.28	2.44	2.56	2.68	2.81	2.95

How to read this

Performance map for the R134A circuit, covering the full 45–80 °C hot-water range. 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 · R134A circuit Condensing against evaporating temperature — the compressor’s permitted operating window

Envelope limits

Evaporating temperature Te	−15 °C to 25 °C
Condensing temperature Tc	30 °C to 85 °C
Peak condensing	85 °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 R134A circuit, redrawn from Panasonic compressor data (Operating envelop.xlsx, sheet “R134a”). 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.