John Wood Commercial Atmospheric Vent - AJWSM - Manual (Page 29)

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cleanout. UN•LIME ® and the booklet may be obtained through
your John Wood dealer or distributor.
FIGURE 18
CAUTION
Observe handling instructions on label of product being used.
TANK CLEANOUT PROCEDURE
The following practices will ensure longer life and enable the unit
to operate at its designed efficiency:
1. Once a month the heater should be flushed. Open the drain
valve and allow two gallons of water to drain from the heater.
Inlet water valve should remain open to maintain pressure in
tank.
2. A cleanout opening is provided for periodic cleaning of the
tank. Gas must be shut off and heater drained before opening
cleanout.
To clean heater through cleanout opening, proceed as follows:
1. Drain heater.
2. Remove outer cover plate from lower side of heater jacket.
3. Remove six (6) hex head screws securing tank cleanout plate
and remove plate.
4. Remove lime, scale, or sediment using care not to damage the
glass lining.
5. Inspect cleanout plate gasket, if new gasket is required, replace
with part no. 9004099215.
6. Install cleanout plate. Be sure to draw plate up tight by
tightening screws securely.
7. Replace outer jacket cover plate.
TROUBLESHOOTING
IGNITION MODULE SYSTEM
Before calling your service agent, the following checklist should
be examined to eliminate obvious problems from those requiring
replacement or servicing.
— Check that “main manual gas shut-off valve” is fully open and
that gas service has not been interrupted.
— Check that after following the appliance OPERATING
INSTRUCTIONS, the “Top Knob” of the appliance gas valve
is in “ON” position.
— Check electrical supply to the appliance for possible blown (or
tripped) fusing or power interruption.
— Is the water temperature in tank below the thermostat
dial setting on the appliance thermostat (calling for
heat)?
— It is possible that the high limit (E.C.O.) has functioned
to shut off the appliance. See FEATURES — Water
Temperature Control for reset procedure. Contact your
serviceman if limit continues to function to shut off
appliance.
SERVICE
The installer may be able to observe and correct certain
problems which may arise when the unit is put into operation.
HOWEVER, it is recommended that only qualified servicemen,
using appropriate test equipment, be allowed to service the
heater.
As preliminary step, check wiring against diagram, check for
grounded, broken or loose wires. Check all wire ends to be sure
that they are making good contact.
ELECTRICAL SERVICING
CAUTION
LABEL ALL WIRES PRIOR TO DISCONNECTION WHEN
SERVICING CONTROLS. WIRING ERRORS CAN CAUSE
IMPROPER AND DANGEROUS OPERATION.
VERIFY PROPER OPERATION AFTER SERVICING.
REPLACEMENT PARTS
Replac ement par ts may be ordered through your
John Wood wholesaler. When ordering parts be sure to
state the quantity, part number and description of the item(s)
including the complete model and serial number as it appears
on the product. Refer to the parts list (available online at
www.johnwoodwaterheaters.com) for more information.
CREATED BY NEEVIA DOCUSTAMP TRIAL VERSION (WWW.NEEVIA.COM) CREATED BY NEEVIA DOCUSTAMP TRIAL VERSION (WWW.NEEVIA.COM)