BASO L62AA - Manual (Page 9)

4 L62AA BASO Safety Shutoff Device Installation Instructions
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 mV Range
Lead Type
Turn
Down Normal
Not Less
Than
K15 4 mV 20-28 15
K16 4 mV 25-35 17
K17 4 mV 30-40 25
K19 4 mV 25-35 17
Note: In high temperature locations, use K15 or K16
Series.
Table 2: L62AA Dropout Range
mA Range of Power Unit Assembly
Low High
100 300
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.
Approximately
1/2 in. (12.7 mm)
Figure 3: Flame Position
Replacement Procedure
!
WARNING: Risk of Explosion or Fire.
Shut off the gas supply at the main manual shutoff
valve before installing or servicing the L62AA.
Failure to shut off the gas supply can result in the
release of gas during installation or servicing, which
can lead to an explosion or fire, and may result in
severe personal injury or death.
!
WARNING: Risk of Electrical Shock.
Disconnect power supply before making electrical
connections to avoid electrical shock.
!
WARNING: Risk of Explosion, Fire, or
Electric Shock. Label all wires before they are
disconnected when replacing the L62AA. Wiring
errors can cause improper or dangerous operation
and may result in an electric shock, fire, or explosion
leading to severe personal injury or death.
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 from the old safety shutoff
device.
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
Steps 3 through 7 in the Installation section to
complete the installation.
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.