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MAINTENANCE
(con't)
,
5. With electrodes exposed, check for the proper
settings as in Figure 19-7, page 17. Check for
any hairline cracks in the insulators. Should
replacement of burner electrodes be required,
certain procedures must be followed In all
cases, removal of electrodes is accomplished
by loosening the electrode mounting (:iamps.
Draw electrodes out of the nozzle assembly
through the holes in the pressure plate.
6. Inspect electrodes for cracked cercHllic or
loose retaining studs that hold the wire: within
the ceramic. Select the proper pressuri:! plate
hole to place each electrode and insert
electrode through hole, retaining stud end first.
7. Tighten electrode-mounting clamp slightly until
electrode ceramics are seated firm!.!' and
completely in the mounting bracket without
gaps between ceramics and mounting hracket
at the bearing faces.
8. Measure and set electrodes according to
Figure 19-7, page 17. After gaps and setting
are complete, fully tighten the electrode-
mounting clamp. Do not overtighten or ce:ramic
insulation may crack.
9. Replace nozzle assembly; be sure to connect
the flame and spark rod wires before irr,·.talling
nozzle assembly fUlly into blast tube. Check
connections on the ends of the flame and
spark rod wires for good contact. lO'Jk for
properly
stripped
wire
ends.
Be
sure
connections are firmly attached to the· flame
and ignition rod ends. Insulating boots can give
a false feeling of proper seating. DO'
NOT
MOVE ELECTRODES. Be careful not to bump
electrodes. Check fan wheel for free rotai1on.
.
'.
'
...
10. Reinstall gas nozzle assembly.
CAUTION:
THE
RELIEF VALVE
IS A
PRIMARY SAFETY DEVICE.
11. The temperature and pressure relief valve
may be checked by slowly lifting the seat lever
on top of the valve to determine its condition
for safe operation. Openings inside the valve
may become restricted by a bUildUp of scale
and become inoperative. If the valve does not
open and close properly when tested, it must
be replaced. Replace the relief valve with like
kind or one meeting the requirements stated
on the rating decal located adjacent. to the
relief valve.
12. A table of periodic safety inspections is
attached to this manual for ease of reference
by the building service technician or licensed
equipment
operator.
Since
water
heater
designs vary, only some of these listed
inspections may be appropriate for your
particular model.
13. PVI strongly recommends the recording of
significant events, such as maintenance or
repair actions and safety inspections, and
encourages the preparation of an event log for
this purpose. All recorded events should be
dated, fully described, and signed
by the
individual performing the service, repair, or
inspection. (See Table 19-2, page 18 for
sample
at
Inspection Record.)
CALL
YOU PVI
CUSTOMER SERVICE
REPRESENTATIVE
IF YOU HAVE ANY. QUESTIONS (1-800-784-8326)
PV500-19 04-2005
16
Section 19
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