6720866942 (2018/06) US SSB
44 | MAINTENANCE
Appendix C - Maintenance
A qualied and adequately trained technician must perform the inspection
as specied in these instructions and in the Service Manual (provided
separately) before each heating season and at regular intervals.
Servicing, inspection and adjustment must be done by a trained
technician in accordance with all applicable local and national codes.
WARNING: Improper servicing or adjustment could damage
the boiler and result in equipment damage or a dangerous
condition!
MAINTENANCE / INSPECTION SCHEDULE
Time interval Maintenance
Annually
Verify the cleanliness of the area around the
boiler
Annually Check the pressure of the hydraulic system
Annually
Check vent piping and verify if leaks are
present
Annually Check air piping and verify if leaks are present
Annually Check relief valve
Monthly (follow local,
state, federal or local
authority having
jurisdiction guidelines)
Verify the condensate discharge system
Every two months Test low water cut off
Every two months Verify the reset button of low water cut off
Every six months Check all piping (gas and water) for leaks
End of heating season Shut off the boiler
Annually * Combustion test
Annually *
Verify condition of ue and air system
(including Venturi and fan)
Annually * Check ignition electrode
Annually *
Cleaning the combustion chamber (including
the burner tube)
Annually * Clean condensate discharge
Annually *
Safety block check, modulation range check,
gas valve closing after burner stop
Annually * Check control parameters
Annually * Check for gas piping leak
Annually * Check wiring and connection
Annually * Verify startup
Annually * Verify the ame
Annually * Check relief valve
Annually * Inspect the burner gasket
(*) Annually or every 2000 hours. Whichever occurs rst.
GAS LEAKING INSPECTION
Verify all gas piping to ensure that there are no leaks.
DANGER:
To verify the gas leaks use a soap solution or
a gas leak detector. Do not use methods that can cause
explosions!
CHECK EXHAUST AND COMBUSTION AIR PIPE SYSTEM
Clear vent systems of any obstructions, corrosion, physical damage,
water stains, rust. Verify the connection between the single components.
Verify the outside terminations are clear. Clean the screens and the
louvers if there is any debris.
INSPECTION OF IGNITION ELECTRODE
Verify that the electrode is clean of deposits and use a dollar bill or other
material to remove deposits as required.
"
0.118" - 0.197"
1
2
Fig. 61 Inspection of ignition electrode
No. Description
1 Burner tube
2 Ignition electrode
CHECKING FOR WIRING AND CONNECTIONS
Check that all wiring is securely fastened and in good condition without
any cracking or alteration of isolation or presence of corrosion in metallic
connection.
BURNER GASKET INSPECTION
You must maintain the boiler as outlined in this manual and have the
boiler started up and serviced at least annually by a qualied service
technician to ensure boiler/system reliability.
This includes a combustion test and the cleaning of the combustion
chamber.
When disassembling the heat exchanger it is crucial to inspect the Burner
Gasket (green: part number 7738004985) for damage.
It is a must to replace the burner gasket when servicing and required if
there is any signs of wear, deformity or discoloration of the gasket and in
any case not later than every two years.
WATER QUALITY
Check water quality according to 4.3 Water chemistry guidelines.
WATER FLOW
Verify the check valves functionality. It is possible to do it, without
removing them, using the following procedure:
• Assuming both modules of the boilers are in stand-by, start one of
them;
• Check the water ow of the Off module on its module screen;
• If the value is lower than 3 l/min (0.8 GPM), check valve is OK;
• If it is higher, remove the valve and check/clean it;
• Repeat the same procedure for the other module.
Spare parts list is available at BOSCH boilers website:
(www.bosch-climate.us).
CAUTION: Label all wires prior to disconnection when
servicing controls. Wiring errors can cause improper and
dangerous operation. Verify proper operation after servicing
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