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Repairs and Replacement
Check the millivoltage output of the thermocouple and
milliampere dropout range at the BASO power unit
terminal to see that they meet the values in
Table 1 and Table 2 If the readings do not meet these
values, replace the thermocouple and/or the safety
shutoff device.
Table 1: Thermocouple Output
Thermocouple
Turn
Lead Type
Down
K15
4 mV
K16
4 mV
K19
4 mV
Table 2: L62AA Dropout Range
mA Range of Power Unit Assembly
Low
100
Pilot Servicing
If pilot flame problems occur, check the following:
•
If the pilot flame burns yellow it may be due to dirt
or lint covering the lower portion of the pilot
burner. Remove dirt and lint using a soft brush or
a vacuum.
•
A flame approximately 1/2 in. (12.7 mm) high must
surround the thermocouple tip (see Figure 3
•
Because this is an electrical connection, the
thermocouple lead connection to the BASO power
unit must be clean and free of grease.
1/2 in. (12.7 mm)
Figure 3: Flame Position
4
L62AA BASO Safety Shutoff Device Installation Instructions
mV Range
Not Less
Normal
Than
20-28
15
25-35
17
25-35
17
High
300
Approximately
Replacement Procedure
!
WARNING: Risk of Shock.
Avoid electrical shock and equipment damage by
disconnecting the electrical power before replacing
or rewiring the safety shutoff device.
!
WARNING: Risk of Fire or Explosion.
Turn off the gas at the main manual shutoff valve
next to the appliance before loosening any gas
connections.
!
WARNING: Risk of Fire or Explosion.
Label all wires prior to disconnection when servicing
controls. Wiring errors can cause improper and
dangerous operation.
When necessary, replace the safety shutoff device as
follows:
1. Turn off power to the appliance.
2. Close the main manual shutoff valve and the pilot
valve.
3. Disconnect the thermocouple lead from the safety
shutoff device.
4. Remove the cover.
5. Disconnect and label the wires from the two wire
terminals and remove the device from the
appliance.
6. Replace with the new BASO L62AA according to
the instructions in the Installation section.
7. Perform the Checkout section before leaving the
installation.
Repairs
Field repairs must not be made to the L62AA safety
shutoff device. If the thermocouple meets the output
listed in Table 1 and the valve does not function,
replace the entire device. Any attempt to repair this
assembly voids the manufacturer's warranty. For a
replacement safety shutoff device, contact the nearest
BASO Gas Products distributor.
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