ACV E-Tech S User manual

E-Tech S
High efficiency electric boilers
34
Sensible Efficiency
For electric to succeed, it is vital that every watt of
input finishes up as useful hot water and heating. The
new range of E-Tech S Tank-in-Tank thermal storage
units is designed to do just that. Four conveniently-
sized models are available and each benefits from the
clever integration of our stainless steel Tank-in-Tank
technology with an equally advanced electric boiler
control system. Cupro incoloy elements within the
primary water provide the electrical energy.
How It Works
An inner stainless steel hot water storage tank draws
heat from primary water circulating through an outer
tank which is heated by heavy duty elements. As
they’re immersed in primary water only, the heating
elements are unlikely to be affected by scaling and
input to them is modulated by a dual stage thermostat
to reduce cycling and load switching. The special
design of the inner DHW tank not only helps ensure
scale-free operation, but also avoids the sediment
problems that plague conventional cylinders. To fully
utilise generated energy the Tank-in-Tank unit is
wrapped in a generous 70mm of polyurethane
insulation.
Benefits and Features
• Quiet operation
• No flue
• Reduced maintenance (no landlord certification)
• Can be used as a stand alone water heater
• Modulating element input
• High hot water storage temperature reduces
legionellae bacteria risk
• Flexible installation options for flow and return
connections
• Vented or unvented use with pressure SystemPaks
available
• Integral primary heating sealed system kit and
circulating pump
• Small footprint enabling compact installation
• Integrated controls
Compact floor standing
combination electric boiler.
Flexible installation options.
Installation Flexibility
Three choices for heating connections.
The boiler can be installed:
• Against the wall
• In a corner facing left
• In a corner facing right

High efficiency electric boilers 35
Technical Data
1. Combined temperature/pressure gauge
2. Dual stage control thermostat
3. Removable top panel
4. Upper front panel, removable for access
to pipe connections
5. Knockouts for pipe work entry and exit
6. Manual reset high limit thermostat
7. High temperature and low water
pressure warning indicator
8. 8 litre expansion vessel/s (one on
160/240, two on 380)
9. Primary water return connection
10. Heating elements
11. Primary drain valve
12. Elements supply contactor
13. Power stage delay timer
14. Primary heating circuit
15. Control circuit connections
16. Control circuit MCB (3 amp)
17. Power cable connections
18. Stainless steel inner hot water tank
19. 70mm polyurethane foam insulation
20. Low water pressure switch
21. Control switches including: on/off,
power stage 1, power stage 2 and
Summer/Winter switch.
160 240 380
A1432mm 1953mm 2134mm
B620mm 620mm 720mm
C720mm 720mm 800mm
D1282mm 1800mm 1985mm
E290mm 290mm 300mm
F43mm 43mm 92mm
G265mm 265mm 265mm
H405mm 405mm 435mm
I310mm 310mm 360mm
J127mm 127mm 94mm
K180mm 180mm 135mm
L126mm 126mm 96mm
Characteristics Dimensions
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E-Tech S E-Tech S E-Tech S E-Tech S
160 240 380 380
Single Phase Single Phase Single Phase Tri-Phase
Maximum output kW 14.4* 14.4* 14.4* 28.8*
Nominal supply V 230 230 230 3 x 400 + N
Nominal supply amps 63 63 63 3 x 42
Primary capacity L 55 68 127 127
Total capacity L 161 242 394 394
Heating surface area m
2
1.26 1.87 2.6 2.6
DHW connection (male BSP) Ø 3/4"3/4"11/2"11/2"
Primary connection (female BSP) Ø 1"1"1"1"
Expansion volume Ltrs 8 8 2 x 8 2 x 8
Weight empty kg 115 155 230 230
Weight full kg 276 397 534 524
Maximum operating temperature °C 85 85 85 85
* Etech S can be down-rated in steps of 2.4kW (Single Phase) and 7.2kW (Tri Phase).
Maximum operating pressure Primary: 3 bar Secondary: 10 bar
Performance Data
E-Tech S E-Tech S E-Tech S E-Tech S
160 240 380 380
Single Phase Single Phase Single Phase Tri-Phase
Litres in first 10 minutes 40°C 310 532 855 870
Litres in first 10 minutes 45°C 250 452 725 739
Litres in first 10 minutes 60°C 168 294 468 472
Litres in first hour 40°C 690 880 1200 1516
Litres in first hour 45°C 570 750 1021 1270
Litres in first hour 60°C 375 465 636 752
Continuous flow 40°C Ltrs/hr 413 413 413 826
Continuous flow 45°C Ltrs/hr 354 354 354 708
Continuous flow 60°C Ltrs/hr 248 248 248 448
Please Note: Performance data assumes a primary flow temperature of 85°C and a domestic cold water supply of 10°C