Technical Data Sheet · EVI Cold-Climate Heat Pump

SE-EVI Series

SE-EVI-150V

Name: Sunniva SE-EVI-150V
Brand: Sunniva Encon LLP
SKU: SE-EVI-150V

Enhanced vapour injection heat pump for cold climates — rated hot water to 60 °C with the ambient as low as −20 °C. R410A scroll circuit, three-phase.

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Heating capacity

150kW

At T1 · A20 °C / W55 °C

Peak COP

3.8

At T1 · A20 °C / W55 °C

Max water temp

60°C

Rated outlet 55 °C

Hot water output

3225LPH

At T1 · A20 °C / W55 °C

Performance

Rated output at each published test condition

T1 A20 °C / W55 °C

Heating capacity: 150kW
Power input: 39.4kW
COP: 3.8
Hot water output: 3225LPH

T3 A0 °C / W55 °C

Heating capacity: 100.4kW
Power input: 38.7kW
COP: 2.6
Hot water output: 1880LPH

T5 A−20 °C / W55 °C

Heating capacity: 74.6kW
Power input: 48kW
COP: 1.6
Hot water output: 1400LPH

Technical specifications

SE-EVI-150V

Technical specifications for SE-EVI-150V
Parameter	Unit	Specification
Electrical supply
Power supply	—	380~415 V / 50 Hz / 3 Ph
Rated current	A	65.5
Maximum current	A	98.2
Required MCCB	—	125 A × 4 pole
Required cable	—	4 core × 35 sq.mm copper cable + earthing
Refrigeration circuit
Compressor	—	Scroll (Copeland / Panasonic)
Number of compressors	Nos	2
Refrigerant	—	R410A
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
Operating ambient range	°C	−25 to 43
Water circuit
Rated water temperature	°C	55
Maximum water temperature	°C	60
Water flow	m³/hr	25.8
Water pressure drop	kPa	≤ 57
Water pipe size	inch	R2-1/2
Unit & acoustics
Dimensions (L × W × H)	mm	2240 × 1185 × 2060
Net weight	kg	570
Noise at 1 metre	dB(A)	≤ 62

Test conditions

T1 — Ambient 20/15 °C (DB/WB), E.T. 10 °C, C.T. 60 °C
T2 — Ambient 10 °C (DB), E.T. 0 °C, C.T. 60 °C
T3 — Ambient 0/−2 °C (DB/WB), E.T. −20 °C, C.T. 60 °C
T4 — Ambient −10/−10 °C (DB/WB), E.T. −20 °C, C.T. 60 °C
T5 — Ambient −20/−20 °C (DB/WB), E.T. −30 °C, C.T. 60 °C

Installation requirement

Dedicated 125 A × 4 pole MCCB required at the unit.
Supply cable 4 core × 35 sq.mm copper, with separate earthing.
Maintain water flow of 25.8 m³/hr; pressure drop across the unit ≤ 57 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	6450 – 19350 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	27.5 m³/hr @ 10 – 12 m head
Recirculation (return) pump	3.1 – 3.9 m³/hr @ 6 – 8 m head
Primary pipe size	65 mm (R2-1/2) to 10 m run; 80 mm beyond
Line insulation	25 mm closed-cell, every line above 45 °C

Civil & electrical

Unit footprint & dry weight	2240 × 1185 mm · 570 kg
Heat pump plinth	2390 × 1335 × 150 mm RCC, M20
Plinth level	100 mm above finished floor, ± 3 mm/m
Tank pad (6450 L)	150 mm RCC, 200 mm larger each side ≈ 7417 kg filled
Clearances	1000 mm air-on · 1500 mm above fan · 1000 mm service side
Electrical	125 A × 4 pole MCCB · 4 core × 35 sq.mm copper cable + earthing

Installation steps

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

Cast the RCC plinth 2390 × 1335 × 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 125 A × 4 pole MCCB using 4 core × 35 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 line and bypassInjected vapourSuction 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
TT 05	Economiser injection temperature	Superheat on the injected vapour — the controller modulates the injection valve against it
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)2240 × 1185 × 2060 mm

Net weight570 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 →	-25	-20	-15	-10	-5	0	5	10	15	20	25	30	35
45 °C	1.96	2.13	2.32	2.85	3.10	3.38	3.68	4.00	4.36	4.75	4.98	5.22	5.47
50 °C	1.85	2.01	2.19	2.68	2.92	3.18	3.46	3.77	4.11	4.47	4.69	4.92	5.16
55 °C	1.74	1.90	2.06	2.53	2.75	3.00	3.27	3.56	3.87	4.22	4.42	4.64	4.86
60 °C	1.58	1.72	1.87	2.29	2.49	2.72	2.96	3.22	3.51	3.82	4.00	4.20	4.40

How to read this

Performance map for the R410A EVI circuit, covering ambients down to −25 °C. 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 EVI circuit Condensing against evaporating temperature — the compressor’s permitted operating window

Envelope limits

Evaporating temperature Te	−30 °C to 15 °C
Condensing temperature Tc	20 °C to 68 °C
Peak condensing	68 °C highest hot-water temperature the circuit can reach
Transient operation	Down to −30 °C Te permitted on start-up and defrost recovery, not continuously

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 EVI circuit, redrawn from Panasonic compressor data (Operating envelop.xlsx, sheet “R410a EVI”). 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.