Servicing
Page 44
To ensure safe and effi cient operation it is essential that a Grant
Vortex boiler is serviced at regular intervals of no longer than 12
months.
Servicing and replacement of parts must only be carried out by a
suitably qualifi ed engineer.
11.1 CHECKS BEFORE SERVICING
The following sequence of checks should be made before starting
any servicing work:
1. Check the fl ue terminal and ensure it is not blocked or
damaged.
2. Run the boiler and check the operation of its controls.
3. Ensure that all water system connections and fi ttings are sound.
Remake any joints and check the tightness of any fi ttings that
may be leaking.
4. Allow the boiler and system to cool down.
5. If the boiler is part of a sealed central heating system, check the
system pressure, check the operation of the pressure relief valve
and check the expansion vessel air charge. Refer to Section 7.
6. Refi ll, vent and re-pressurise the system as necessary. Refer to
Section 7.
7. Check that any ventilation openings are adequate of adequate
free area and are clear of obstructions. See Section 9.
8. Remove any sludge/water from the fuel tank by opening the
sludge valve at the lower end of the tank (if fi tted).
9. Ensure that all fuel system connections and fi ttings are sound.
Remake any joints and check the tightness of any fi ttings that
may be leaking.
10. With the fuel supply valve (at the oil tank) closed, clean/
replace the fi lter element and clean the fi lter bowl.
The data label on the inside of the case side panel will indicate the
fuel used and the nozzle fi tted.
11.2 DISMANTLING PRIOR TO
SERVICING
The procedure for dismantling the boiler is as follows:
1. Remove the front panel from the boiler (pull forward at the top
and then lift off).
2. On system models, carefully lift up the expansion vessel and
remove it from the boiler. Place it on the fl oor, taking care not
to strain the fl exible pipe.
3. Disconnect the fl exible air tube from the burner.
4. Unscrew and remove the two fi xing screws and remove the red
cover from the burner.
5. Remove the burner fi xing nut (located at the top of the
mounting fl ange) and withdraw the burner from the boiler. If
required, disconnect the fl exible oil line(s), using a suitable
container to prevent any oil spillage.
6. Check or replace the fl exible fuel supply hose, as follows:
• Braided fl exible fuel supply hoses (as supplied with the
boiler) should be replaced annually, i.e. when the boiler
is serviced.
11.3 CLEANING THE BOILER
The procedure for cleaning the boiler is as follows:
1. Remove the nuts and washers securing the front cleaning door
and withdraw the door. Take care - it is heavy.
2. Remove the baffl es as shown in Figure 11-1, Figure 11-2 and
Figure 11-3.
3. Remove all deposits from the baffl e plates and all the boiler
internal surfaces using a stiff brush and scraper if necessary.
4. Check the condition of the fl ue, clean as necessary.
5. Check the condition of the front cleaning door seal and replace
if necessary.
6. Replace the baffl es, ensuring they are correctly fi tted. Refer
to Figures 11-1 to 11-5, as appropriate. Pull out the spiral
turbulators from the heat exchanger tubes. See Figure 11-6.
7. Clean the turbulators using a stiff brush.
8. Test the heat exchanger condensate drain by pouring water
into one of the lower tubes and observe whether the water
discharges from the 22 mm condensate outlet. Replace the
turbulators.
9. Replace the front cleaning door, ensuring the seal is in good
condition and secure it in position with the nuts and washers
previously removed. Tighten to form a seal.
10. Remove the condensate trap and check that it is not blocked
and is operating correctly, i.e. the fl oat is free to move. Clean
the trap and fl oat as required.
11. Check that the boiler condensate outlet is unobstructed. Clean
if necessary.
12. Check condition of hose between trap and boiler, replace if
necessary.
13. Test and reset remote action fi re valve.
14. Check the operation of the high limit thermostat.
11 SERVICING
Details of every service should be entered in
the boiler passport which is supplied with the
boiler..
This information may be required to validate
the Grant guarantee.
CAUTION
WARNING
Before starting any work on the boiler or fuel
supply, please read the Health and Safety
information given in Section 14 of these
Instructions.
WARNING
Before servicing, set the boiler ON/OFF switch
to OFF, isolate the electricity supply and close
the fuel supply valve.
With a two-pipe oil supply there will be two
fl exible hoses connected to the burner. Identify
(mark if necessary) which is the inlet and
return if they are to be disconnected.
NOTE
The condensate trap and condensate outlet
must be checked on every service and cleaned
as necessary.
The end cap is not sealed to the trap body and
can be removed for cleaning. Ensure that this
cap is correctly re-fi tted before re-starting the
boiler.
NOTE
