Maintenance; Overview Of Inspection And Maintenance Tasks - Vaillant ecoTEC plus 937 Instructions For Installation And Servicing

7 Inspection and maintenance
7.1.2

Maintenance

Carry out a first inspection of the system before starting
maintenance or repair work as follows:
• Check the flue system, the pipework and the electrical
connections for signs of damage or wear.
• Check the air supply and ventilation of the installation.
• Check the heating and water system, especially the
condition of the radiator valves, evidence of leaks in
the heating system and dripping hot water taps.
7.1.3

Overview of inspection and maintenance tasks

No. Step
1 Check flue system and make sure that it is not blocked, not damaged and fixed correctly.
Measure the gas rate in operation (see Table 5.1 in Section Commissioning, Part l). If the gas
2
rate is less than the minimum value, carry out maintenance work (Column 2).
Check combustion by measuring the CO and CO
Carry out the maintenance if the measured values are outside the tolerances (Column 2). If
3 flue gas analyser is not available, check the ignition process and the flame picture on the
burner through the sight glass; if incomplete combustion is evident carry out maintenance
(Column 2)
4 Isolate the unit from the electrical mains, close the gas and the water service valves.
Inspect the entire primary heat exchanger area for visible signs of corrosion, sooting up or
5
other damage. If damage is detected, carry out maintenance work (Column 2).
Remove compact thermo-module (as described in Section 7.2.1), if maintenance is required as
a result of steps 2, 3 or 5. Clean the primary heat exchanger. Fit seal kit for burner door
6
(observe the fitting instructions included with the seal kit). Re-fit the compact thermo-module
and tighten the nuts.
Check whether the electrical plug connections and other connections are fitted tightly and
7
make adjustments, if necessary.
8 Check expansion vessel of the combi boiler. If required, correct the pressure.
9 Check combi boiler in general, check combi boiler for dirt/dust and clean if required.
10 Check and clean the condensate trap and discharge pipes.
11 Open gas inlet and isolation valves, connect unit to the electrical mains and switch on.
12 Test the unit and the heating system including the hot water operation. Bleed if required.
13 Check the expansion vessel of the shift load storage tank. If required, correct the pressure.
Fill the pressure in the combi boiler or in the heating system to approx. 1.0 - 2.0 bar
14
(dependent upon the static height of the plant).
Measure the gas rate during operation and check that it is within tolerances (see Table 5.1 in
15
Section Commissioning, Part I).
Check combustion by measuring the CO and CO
16 measured values must be in tolerance. If there is no combustion analyser is available, check
the ignition process and the flame picture on the burner visually through the sight glass;
17 Check the boiler for any leaks and seal if necessary.
18 Fill out gas commissioning checklist (Benchmark).
Table 7.1 Inspection and maintenance steps
44
values, compare with values in Table 9.2.
2
values, compare with values in Table 9.2. The
2
Column 1
An inspection
must be
performed once
a year.
x
x
x
x
x
x
x
x
x
x
x
x
x
x
ecoTEC plus 937 installation and maintenance manual
Column 2
Maintenance
x
x
x
x
x
x
x
x
x
x
x
x
x
x