Weil-McLain EcoTec 80 Manual page 132

G -
®
ECO Tec
AS FIRED WATER BOILER
Cleaning DHW and Brazed Plate Heat Exchanger
Actions for chemical cleaning
of Domestic hot water circuit
(Refer to Figure 117)
1. Shut down the boiler:
a. Follow "To Turn Off Gas to Appliance"
instructions on boiler and Operating
instructions.
b. Close the boiler manual gas valve.
2. Close off the of cold water inlet valve (Item
6a) placed before the boiler inlet.
3. Release residual pressure in domestic hot
water circuit in the boiler by opening a hot
water tap downstream of the boiler. Then
close the DHW hot water outlet valve (Item
6b).
4. Connect the pipe fittings and hoses of the
pump for chemical cleaning to the cold water
inlet (3a) and domestic hot water outlet (3b).
5. Fill the pump tank with the de-scaling
chemical that is NSF approved. Be sure to
follow the manufacturer's instructions for
proper handling and disposable of the used
cleaning solution.
6. Circulate the fluid within the domestic hot
water circuit by activating the pump switch.
Reversing the cleaning flow through the
boiler's domestic water circuit by placing
the circulating pump on the domestic hot
water outlet hose may be required for proper
cleaning.
7. At the end of the cleaning cycle, empty
the pump from chemical and recover the
product in appropriate containers for
disposal.
8. Fill the pump with water and perform
a washing cycle in order to remove the
chemical product still present within the
coils of the heat exchanger, recovering the
liquid in suitable containers for disposal.
9. Repeat the washing with water more than
once if necessary.
10. Disconnect the pipe fittings and hoses of
the pump for chemical cleaning from the
cold water inlet (3a) and domestic hot water
outlet (3b).
11. Open the cold water inlet valve placed before
the boiler inlet.
12. Reconnect the unit to the electrical power
supply using the switch and/or the special
cut-off devices and turn it ON.
13. Check the correct operation of the boiler
and production of domestic hot water.
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Domestic water circuit cleaning diagram instructions
B M
OILER ANUAL
Part number 550-100-260/0520