WV4262B POWERED DAMPER WATER HEATER CONTROLS
69-2496—03 8
MAINTENANCE
Fire or Explosion Hazard
Can cause severe injury, death, or property
damage.
Do not attempt to take the control apart or
clean it. Improper cleaning or reassembly can
cause gas leakage.
The maintenance program should include regular
checkout of the control as outlined in the Installation
section, and the control system as described in the
appliance manufacturer literature.
Maintenance frequency must be determined
individually for each application. Some considerations
are:
1. Cycling frequency. Appliances that may cycle
3,000 times annually should be checked
monthly.
2. Intermittent use. Appliances that are used sea-
sonally should be checked before shutdown and
again before the next use.
3. Consequence of unexpected shutdown. Where
the cost of an unexpected shutdown would be
high, the system should be checked more often.
4. Dusty, wet, or corrosive environment. Since these
environments can cause the control to deterio-
rate more rapidly, the system should be checked
more often.
The system should be replaced if:
a. It does not perform properly on checkout or
troubleshooting.
b. The control is likely to have operated for
more than 100,000 cycles.
c. The control has been flooded.
SERVICE
Fire or Explosion Hazard
Can cause severe injury, death, or property
damage.
Do not disassemble the water heater control; it
contains no replaceable components.
Attempted disassembly or repair can damage
the control.
Sequence of Operations
1. Follow the sequence of operation as shown
in Table 4.
Table 4. WV4262B Sequence of Operation.
Sequence Mode Description
Power Up
1 Start-up Upon Power up, the control runs a safe-start check of
RAM, ROM, and I/O with a typical start-up delay of 1-2
seconds.
2 Flammable Vapor Check To insure no outputs are energized if flammable vapors
are present, the control pre-loads a condition indicating
flammable vapors are present. If no vapors are really
present, then the control resumes normal operation with
no perceptible delays. If vapors are present, the control
will immediately perform the flammable vapor lockout.
Heating Sequence
0 Idle Normal operation
1 Heat demand The control receives a demand for heat (the temperature
is less than set point minus differential).
2 Check damper end switch The control checks the damper end switch to insure the
damper is closed.
3 Energize damper motor The damper motor is energized.
4 Monitor damper end switch The control monitors the damper end switch until the
damper is open.
5 Energize pilot and spark igniter The pilot valve and spark igniter are energized (after the
Prepurge time).
6 De-energize spark igniter The igniter is de-energized (when flame is proved above
the “Igniter Off” level).
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