Cleaning Procedure:
On an annual basis when using extremely hard water the inner bundle
will need cleaning to remove lime and scale deposits. This is simply
done by draining the unit and following these steps:
1. Close the outlet isolation valve to the domestic system and turn off
recirculation pump.
2. Close the inlet isolation vales to the heater domestic supply and loop
recirculation. This will totally isolate the shell.
3. Remove the top thermometer from the shell. The connection will be a
¾” and is located at the very top of the shell.
4. Than using a small flexible funnel completely fill the shell with
“DD518” biodegradable descaling fluid (approx. 4 gallons) for a 10”
unit, and install the thermometer. Wear protective eye wear and gloves.
5. With the unit full turn on the recirculation pump for 2 hours. Do not
operate over 2 hours. Open lower drain valve and drain the shell of the
fluid as the fluid is biodegradable and can be sent to the drain.
6. After the shell is drained fill with cold domestic water twice and flush.
The system is now ready for use.
