Thermalec ZENITH ZHR 96, Instruction Manual

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Zenith Range Instruction Manual
Page 17
Water flowrate through the heater
The flow rate of water through the heater should be set within the ranges given in the
following table:
Flow Rate 96 kW 120 kW 144 kW 168 kW
Hard water maximum
- use bypass above this rate
- minimise scale formation
9000 gal/hr
700 l/min
9000 gal/hr
700 l/min
9000 gal/hr
700 l/min
9000 gal/hr
700 l/min
Soft water maximum
- use bypass above this rate
- improves element life
4500 gal/hr
350 l/min
4500 gal/hr
350 l/min
4500 gal/hr
350 l/min
4500 gal/hr
350 l/min
Minimum
1920 gal/hr
160 l/min
2400 gal/hr
200 l/min
2880 gal/hr
240 l/min
3360 gal/hr
280 l/min
Calculation of the water flowrate
To calculate the exact flowrate of water flowing through the heater, apply the following
method:

Allow the pump to run with the heater off for a few minutes;

Take a reading on the outlet water temperature indicator;

Then switch the heater on and allow about five minutes for the temperature to
stabilise before taking a second temperature reading.

The difference between the two readings gives the exact temperature rise for that
particular flow rate;

Use the following formula to establish the rate:
Flowrate (litres/min.) =
Heater kW rating x 14.4
Temperature rise in C °