Raychem HWAT-ECO Handbuch Seite 27

Warning: The selected pipework material should be able to resist the decontam-
ination temperature.
The graphs on page 28 and 29 indicate the time needed for the heat-up of
the warm water to a desired decontamination temperature with HWAT-R
heater
Notes:
The graphs are theoretically calculated. A safety margin should be taken
into account based on the condition of the pipework, e.g. lime.
The heat-up times are valid after ageing of the HWAT-R heater.
The HWAT-R heater achieves specified power after ±1 month of full
operation.
Calculation steps of heat-up time for legionella prevention:
1. Select the appropriate graph based on average pipe diameter and used
insulation thickness
2. Read the required heat-up time between maintain temperature and 60°C
= ∆T
3. Increase heat-up time by 30 minutes for legionella destruction
4. Ensure that the previous block is at maintain temperature of minimum
50°C (otherwise heat-up time will be too long)
Total heat-up time for programming = ∆T + 30 minutes
Note: the cool-down time till maintain temperature takes ± equal time.
Take necessary measures to prevent scalding. Legionella prevention dur-
ing night is recommended.
Example:
1. Select graph for 1" pipe Stainless Steel (SS), 30 mm Rock Wool (RW)
insulation
2. ∆T from 55°C to 60°C = 45 min.
3. Total = 45 min. + 30 min. = 75 min. heat-up cycle
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