17
Sales/Spares & Replacement Help Line 01604 762881
17. SERVICING & MAINTENANCE
NOTE: It is recommended that this appliance be serviced at intervals of no less than 12 months.
IMPORTANT: Ensure that the gas and electricity supplies are isolated before commencing any servicing &
maintenance or replacement of components. Because the appliance is room sealed, it is also imperative that if
at any stage of repairs the gasket on the sealing plate is damaged it MUST be replaced! After completion of any
maintenance, always test for gas tightness and carry out a complete functional test of the appliance in accordance
with the Commissioning Instructions at paragraphs 6.1 to 6.6 inclusive.
17.1 ROUTINE MAINTENANCE
17.1.1 Operate the appliance and check for the correct function of the burner and controls.
17.1.2 Turn OFF the gas and electrical supplies to the appliance.
17.1.3 Remove the air heater front panel.
17.1.4 Remove and check the return air filter/cleaner for cleanliness, remove and clean the air circulation
fan as detailed in para 10.6.
17.1.5 Remove the burner and controls assembly as detailed in para 10.2, inspect and clean the main
burner and injector as necessary. Examine the main burner for cracks, including hairline cracks,
exchanging the burner as necessary.
17.1.6 Inspect and clear the ignition burner orifice.
17.1.7 Clean the heat exchanger flueways by thoroughly brushing from above and below.
17.1.8 By viewing through the fan aperture, and using a torch or similar, examine the heat exchanger
externally for signs of cracks or holes, particularly around welded joints.
17.1.9 Using a torch or similar, introduce a light source into the heat exchanger burner aperture and upper
access port, and again examine the heat exchanger for signs of cracks or holes, particularly around
welded joints, whilst again viewing through the fan aperture.
17.1.10 Refit the air circulation fan, burner and controls assembly, sealing panel and air filter/air cleaner.
17.1.11 Allow the air heater to operate for approximately 15 minutes to ensure stability and, with the main
burner lit, ensure that the operation of the air circulation fan does not affect the main burner flame
profile.
17.1.12 Locate the flue gas test point and attach a flue gas analyser to the test point in accordance with
the manufacturer’s instructions.
NOTE:
The CO/CO
2
ratio should be no greater than 0.008
17.1.13 Fully commission the appliance in accordance with paragraphs 6 and 8.
NOTE:
The flue gas test MUST NOT be used as an alternative to servicing the heater!
17.2 MULTIFUNCTION CONTROL & AIR HEATER/WATER CIRCULATOR BURNER ASSEMBLY REMOVAL
NOTE:
Both the air heater and water circulator burner assemblies, as well as their respective ignition burner
assemblies, MUST be removed as a complete unit together with their respective multifunction control.
PROCEDURE
17.2.1 Ensure that the gas and electrical supplies are switched OFF.
17.2.2 Remove the front door from the heater.
17.2.3 Remove the fixing screws that hold the sealing panel in place and carefully remove the panel.
17.2.4 Disconnect the electronic module from the relevant multifunction control by removing the securing
bolt and sliding it away from the heater unit, taking care not to cause damage.
17.2.5 Break the flared connection on the relevant multifunction control from the gas supply feed.
17.2.6 Remove the relevant burner assembly fixing screws.
17.2.7 Whilst supporting the assembly, carefully remove the fixing screws securing the multifunction control.
17.2.8 Carefully remove the complete assembly, by sliding the sealing grommet out of the bulkhead, taking
care not to cause damage to the grommet!
10.2.9 Refitting the burner assembly is a reverse procedure of the above instructions.
17.3 BURNER ASSEMBLY CLEANING
17.3.1 Remove the burner assembly as detailed above.
17.3.2 Disconnect the ignition burner gas feed pipe from the ignition burner
17.3.3 Release the 2 screws, and washers securing the ignition burner to the main burner and remove the
ignition burner.
17.3.4 Release the 3 screws and washers securing the main burner to the mounting bracket and remove
the main burner.
17.3.5 Clean the burner thoroughly both inside and out with a soft brush.
DO NOT ENLARGE, DISTORT
OR DAMAGE BURNER HOLES
.
17.3.6 Reassemble in reverse order.
Содержание 42-416-18
Страница 21: ...21 Sales Spares Replacement Help Line 01604 762881 FIGURE 14 CONTROL FLOWCHART 19 FAULT FINDING...
Страница 22: ...www johnsonandstarley co uk 22 FIGURE 15 AIR HEATER DIAGNOSIS FLOWCHART...
Страница 23: ...23 Sales Spares Replacement Help Line 01604 762881 FIGURE 16 WATER CIRCULATOR FLOW CHART...
Страница 24: ...www johnsonandstarley co uk 24 20 LOGIC DIAGRAM FIGURE 17 LOGIC DIAGRAM...
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