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16.4
CLEANING THE HEAT EXCHANGER
To clean the heat exchanger, the following procedure should be carried out:
1.
Remove the burners as above.
2.
Use a vacuum cleaner to remove any accumulation on the heating surfaces.
3.
Inspect the heat exchanger to ensure that the 1 mm flueway is clear between all coils.
4.
If any debris is still present, brush the heat exchanger with a non-metallic brush taking care not to
damage the insulation panel on the rear wall of the heat exchanger.
NOTE:
A kit of components to aid with cleaning the heat exchanger is available from Lochinvar Limited.
For models CP-M+60 – CP-M+120 use part number KIT30063, for models CP-M+150 & CP-M+180
use part number KIT30064.
NOTE:
It is very important to inspect and remove all deposits from the heat exchanger. If all deposits
cannot be removed from the heat exchanger, contact Lochinvar Limited for further guidance.
5.
Once the heat exchanger has been brushed it should be rinsed with fresh water to remove all residues.
6.
Remove the condensate water trap and clean out any debris.
7.
Refit the condensate drain and fully recharge by pouring 1 litre of water through the heat exchanger
coils.
8.
Reinstall the burner.
9.
Restart the boiler as detailed in Section 14.4.3:
16.5
DRAINING THE BOILER SYSTEM
The boiler must be drained if it is to be shut down and exposed to freezing temperatures. Maintenance and
service procedures may also require draining the boiler.
16.5.1
DRAINING AN INDIVIDUAL BOILER
1.
Turn off the boiler electrical disconnect switch.
2.
Turn off the boiler isolation valves.
3.
Attach a hose to the boiler drain valve and locate the discharge in an area where hot water will not
cause any damage or injury.
4.
Open the boiler drain valve and the automatic air vent plug to allow water to escape.
5.
Once the boiler is drained, close the drain valve.
16.5.2
DRAINING THE COMPLETE SYSTEM
1.
Turn off the boiler electrical disconnect switch.
2.
Connect a hose to the system drain valve.
3.
Locate hose's discharge in an area where hot water will not cause any damage or injury.
4.
Close the cold-water inlet valve from the header tank or pressurisation unit to boiler system.
5.
Open the drain valve.
6.
Working systematically from the highest point in the heating system, open bleed valves to allow the
system to drain.
7.
Close all bleed valves
8.
If the system is being drained for an extended shutdown, it is suggested the drain valve be left open
during this period.
16.6
REFILLING THE SYSTEM
1.
Close the drain valve.
2.
Open the cold-water inlet valve from the header tank or pressurisation unit to boiler system.
3.
Working systematically towards the highest point in the system, open all bleed valves and allow any
trapped air to escape.
4.
Follow the lighting instructions as detailed in
LIGHTING.
5.
Check for water leakage and airlocks, remedy as necessary.
PROCEDURE FOR INITIAL LIGHTING.
Section 14.4.3:
PROCEDURE FOR INITIAL
79
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