Strebel S-WG 100, Installation, Operating And Maintenance Manual, Page: 117 / 125

E09.012.246 Manual S-WG
118
17.3 Inspection & maintenance
Inspection, maintenance and the replacement of water heater parts should only be done by a skilled service
engineer. Apart from the maintenance proceedings it is advised to have a log chart for every water heater that
describes the following aspects:

Serial number

Date and time of maintenance

Name of maintenance engineer

Which parts were exchanged during maintenance

Which settings (software) were changed during maintenance

Special remarks / findings

Future aspects that need extra attention

Additional aspects: measurement reports, complaints by the (end)-user, lock-out codes, etc.
During maintenance the following parts and aspects of the water heater should be checked and inspected.
NOTICE: Before starting to work on the water heater:

Switch off the electrical power to the water heater (service switch and/or unplug water heater)

Close the gas valve to block gas supply to the water heater
Customer comments
Comments and remarks from the customer should be analysed and used to find possible causes for any occur-
ring problems and complaints.
Service history
The operational and fault history (total amount and since the last service) of the water heater can be retrieved
with the help of a computer, correct software and an interface cable. This information can be used to specify the
maintenance and service proceedings in relation to the water heater (parts).
Flue gas & air supply
The flue gas pipes and the air supply pipes must be checked for gas tightness. Also check if the mounting of
these pipes is correct, safe and not damaged. Check the rooftop of the water heater housing for signs of water
leakage and traces of water coming from the air supply pipe, the air vent or any condensate coming from the flue
gas pipes.
Gas supply & safeties
The gas pipes must be checked for gas tightness. Also check if the mounting of these pipes is correct, safe and
not damaged. Any built in safeties should be checked for a correct functioning.
Remove complete burner unit
The complete burner unit consists of the fan, the burner plate and the internal burner. To remove this part for an
internal heat exchanger check: remove the 6 x M6 nuts and the ignition cable. After this take out the complete
burner unit by moving it forward out of the water heater housing. NOTICE: watch out for the burner plate insula-
tion that
it won’t be damaged during this operation. While removing the complete burner unplug both of the elec-
trical and controlling cables of the fan. After all this dismantle the air/gas mixing box on the suction side of the
fan and check the blade wheel of the fan.
Burner
Check the burner surface to see if it has damages, signs of rust and/or is cracked. When the burner surface is
damaged the burner must be replaced. The burner can be cleaned by using a soft
non-metallic brush. The dust
can be removed with a vacuum cleaner or pressurized air.