A.O. Smith TWI 45-190 Maintenance, Water-side maintenance 10.3.1 Descale, Gas-side, Introduction

10 Maintenance

10.3Water-side maintenance

10.3.1Descale

Scaling depends on the water condition and the water demand. Besides, more scale deposit will be formed in the device at high temperatures. A temperature setting of 60 ºC is recommended to ensure low scale deposit. Descale using the appropriate agents. A descaling instruction is available for detailed information.

10.3.2Clean the condensation drainage

Regularly clean the condensation drainage and the siphon to avoid stoppage.

10.4 Gas-side
maintenance	10.4.1 Introduction
	Proceed as follows for gas-side maintenance:
	1.	Clean the burner.
	2.	Clean the heat exchanger.

10.4.2 Clean the burner

1.	Dismount the burner.
2.	Remove the contamination present on the burner.
3.	Remount the burner.
10.4.3 Clean the heat exchanger
1.	Dismount the burner.
2.	Clean the combustion chamber of the heat exchanger using a vacuum
	cleaner and a soft brush.
3.	Dismount the flue gas discharge.
4.	Clean the end of the heat exchanger using tap water.
5.	Remount the burner.
6.	Remount the flue gas discharge.

Remark

Check the pressure difference again after cleaning. Contact the supplier of the device if the pressure difference remains too low.

10.5 Complete
maintenance	Proceed as follows for completing the maintenance:
	1.	Fill the device (5 “Fill”).
	2.	Start up the device (7 “Start up”).

50 Instruction manual TWI 35-130 G/TWI 45-190 G