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Turn Down Test with Y99AB Test Kit
To perform the turn down test with the Y99AB Test
Kit:
1. Disconnect the thermocouple lead from the
BASO power unit.
2. Set the Y99AB test kit to use the 0-50 millivolts
scale.
3. Connect the Y99AB test kit leads as shown in
Figure 2. Connect lead 44549-8 to the
thermocouple lead, and connect lead 44549-7 to
the thermocouple connection of the BASO
power unit (see Figure 2).
4. Push and hold down the reset button of the
BASO power unit until it remains down.
Turn Down Test without Instruments
If you do not have the Y99AB Test Kit, perform the
turn down test using the following steps:
1. Reduce the pilot flame by turning the manual
B valve to a point where the pilot flame does not
impinge on the thermocouple (see Figure 3).
© 2017 BASO Gas Products
Part No. BASO-INS-J99xREPLACEMENT, Rev. B
Power
Source
Thermostat
BASO
Power Unit
Reset
Manual B
Button
Pilot Valve
Pilot Burner
Gas Line
Figure 2: Turn Down Test Using Y99AB Test Kit
J99x Series BASO® Replacement Pilot Burners
5. Reduce the pilot flame by turning the manual B
valve to the point where the open circuit reading on
the Y99AB is not more than 4 millivolts.
6. Cycle the main burner On and Off at least
three times. The main burner must ignite each time
within 4 seconds.
If you cannot secure ignition of the main burner
when the millivoltage reading is 4 millivolts, the pilots
are located improperly with respect to the main
burner. Relocate the pilot and repeat Steps 5 and 6.
7. Return the pilot to normal operation by turning the
manual B valve to the fully opened position and
reconnecting the thermocouple to the BASO power
unit.
Y99AB
MILLIAMPS
500
20
0-500
MILLIVOLTS
D.C.
PE NN-B ASO CO NTROL S
0-1000 0-50
MILLIVOLTS
44549-7
MILLIAMPS
MILLIVOLTS
Thermocouple
Lead
Figure 3: Turn Down Test without Instruments
ADJUST
Red
Black
This flame must
ignite the main burner.
3
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