10 Maintenance
10.1Introduction
10.2Prepare maintenance
Service shall be carried out at least once a year both on the gas side and on the water side. The frequency of the maintenance depends, among other things, on the water quality, the average number of operating hours per day and the set water temperature.
Remark
Regular maintenance lengthens the life of the device. For determining the correct maintenance frequency, it is advised to have the service and maintenance engineer check the gas side and the water side of the device three months after installation. The maintenance frequency can be determined on the basis of this check.
Proceed as follows for testing the proper functioning of all components:
1.Maximally turn the thermostat counterclockwise.
2.Wait until the fan stops.
3.Turn the thermostat to its original position. Then draw off water to create a heat demand.
4.Check if the heating cycle runs correctly (7.3 “Heating cycle of the device”).
5.Check the
6.Check all parts of the flue gas discharge system for proper fastening.
7.Check the pressure difference of the pressure switch (see the table). Clean the heat exchanger and burner if the pressure difference is too low (10.4.2 “Clean the burner” AND 10.4.3 “Clean heat exchanger”).
Pressure difference of air pressure switch
Device | Measured pressure difference over air pressure switch |
TWI | ≥ 730 Pa |
TWI | ≥ 400 Pa |
8.Test the functioning of the expansion valve of the protected cold supply setup. The water has to flow out in a forceful jet.
9.Test the functioning of the T&P valve (if applicable). The water has to flow out in a forceful jet.
10.Check the discharge pipes of the expansion valve and remove any present scale deposits.
11.Drain the device (see Drain).
Instruction manual TWI | 49 |
