Manual FlexTherm Eco
7
1) Storage operating as hot water heaters. Charged to 75 °C and then discharged using mains cold water at 10 °C until the hot water
outlet temperature dropped to 40 °C.
2) Storage operating as hot water heaters. Charged to 55 °C and then discharged using mains cold water at 10 °C until the hot water
outlet temperature dropped to 40 °C.
3) For FlexTherm Eco E type, the low power circuit (LPC) can be connected to external heat source e.g. a boiler.
4) For FlexTherm Eco compact heat storage, the high power circuit (HPC) is connected to the mains cold water supply for producing hot water.
5) Calculated from the storage capacity of the heat storage and assuming that the hot water cylinder thermostat is set at 60 °C, mains
cold water inlet temperature is at 10 °C and the stored energy utilisation factor of cylinder is 0.85.
6) Calculated from the storage capacity of the heat storage and assuming that the hot water outlet temperature is set at 40 °C, mains
cold water inlet temperature is at 10 °C and the stored energy utilisation factor of cylinder is 0.95.
7) To fully charge the heat storage, the source flow temperature should be set so that it does not start to cycle on its internal thermostat
and it should not be less than the value stated in table 4.2a. The storage will be fully charged when the storage return temperature is
about 5°C less than the heat source flow temperature.
8) Maximum constant heat source flow temperature when charging the heat storage.
9) Recommended setting for the hot water thermostatic blending valve.
10) Power supply to the heat storage/system controller via local 2-pole isolator.
11) Power supply for the standby electric heater vial local 2-pole isolator – Only for FlexTherm Eco E type of heat storage.
Table 2.3a: Pressure loss characteristic of FlexTherm Eco 3E storage
Flow rate Low power circuit (LPC) High power circuit (HPC) HPC & LPC Circuits in parallel
[l/s] [m3/h] [bar] [kPa] [bar] [kPa] [bar] [kPa]
0.10 0.360 0.049 4.920 0.016 1.572 0.006 0.640
0.20 0.720 0.197 19.680 0.063 6.289 0.026 2.560
0.30 1.080 0.443 44.280 0.142 14.151 0.058 5.760
0.40 1.440 0.787 78.721 0.252 25.157 0.102 10.240
Table 2.3b: Pressure loss characteristic of FlexTherm Eco 6E storage
Flow rate Low power circuit (LPC) High power circuit (HPC) HPC & LPC Circuits in parallel
[l/s] [m3/h] [bar] [kPa] [bar] [kPa] [bar] [kPa]
0.10 0.360 0.082 8.228 0.023 2.335 0.010 1.000
0.20 0.720 0.329 32.914 0.093 9.339 0.040 4.000
0.30 1.080 0.741 74.056 0.210 21.013 0.090 9.000
0.40 1.440 1.317 131.655 0.374 37.357 0.160 16.000
Table 2.3c: Pressure loss characteristic of FlexTherm Eco 9E storage
Flow rate Low power circuit (LPC) High power circuit (HPC) HPC & LPC Circuits in parallel
[l/s] [m3/h] [bar] [kPa] [bar] [kPa] [bar] [kPa]
0.10 0.360 0.114 11.405 0.034 3.405 0.014 1.424
0.20 0.720 0.456 45.620 0.136 13.619 0.057 5.695
0.30 1.080 1.026 102.644 0.306 30.643 0.128 12.814
0.40 1.440 1.825 182.478 0.545 54.477 0.228 22.781
Minimum heat source
flow temperature
[7]
[°C]
65 65 65
Maximum heat source
flow temperature
[8]
[°C]
80 80 80
Hot water outlet
temperature at design
flow rate
[9]
[°C]
50 - 55 50 - 55 50 - 55
Heat storage controller
• CC power supply rating
at 230V, AC, 50Hz
[10]
• Electric heater supply
rating at 230V, AC, 50Hz
[11]
• Standby power
consumption – All
models
• Power rating of the
heater at 230V, AC, 50Hz
(‘e’ models only)
[A]
[A]
[W]
[W]
6
16
<1
2,800
6
16
<1
2,800
6
16
<1
2,800
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