John Wood Takagi - 240H-340H-540H - Manual (Page 41)

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MAINTENANCE AND SERVICE
• Clean the cold-water inlet filter. (Refer to diagram below.)
• Be sure that all openings for combustion and ventilation air are not blocked.
• The venting system should be checked annually for any leaks, corrosion, blockages or damage.
• The burner should be checked annually for dust, lint, grease or dirt.
• Keep the area around the water heater clear. Remove any combustible materials, gasoline or any
flammable vapors and liquids.
• In accordance with all local codes and common safety practices, water discharged from the pressure
relief valve can cause severe burns instantly from scalding. DO NOT touch the pressure relief valve.
• If the relief valve discharges periodically, it may be due to thermal expansion in a closed water supply
system. Contact the water supplier or local plumbing inspector on how to correct this situation.
• Visual check of burner flames (see below) through the burner window in the burner assembly located
at the middle of the water heater.
The manufacturer recommends having the unit checked once a year or as necessary by a licensed
technician. If repairs are needed, any repairs should be done by a licensed technician.
UNIT DRAINING and FILTER CLEANING
Normal Operation
Owner's Guide
Turn off the electrical power supply and close the manual gas shutoff valve
and the manual water control valve before servicing.
WARNING
1. Close the manual gas shutoff valve.
2. Turn off power to the unit and wait a couple of seconds.
Turn on again.
3. Wait 30 seconds, and then turn off power to the unit,
yet again.
4. Close the water shutoff valve.
5. Open all hot water taps in the house. When the
residual water flow has ceased, close all hot water taps.
6. Have a bucket or pan to catch the water from the unit’s
drain plugs. Unscrew the two drain plugs (Large and
small) to drain all the water out of the unit.
7. Wait a few minutes to ensure all water has completely
drained from the unit.
8. Clean the filter: Check the water filter located within
the cold inlet. With a tiny brush, clean the water
filter of any debris which may have accumulated and
reinsert the filter back into the cold water inlet.
9. Securely screw the drain plugs back into place.
Hand- tighten only.
Satisfactory
Blue flame
Unsatisfactory
Flame
blowing up
Unsatisfactory
Red or Yellow
flame
Water valve
Gas
valve
Drain plug
(Small)
Drain plug
with Filter (Large)