2 Series Y75 Replacement Sensing Probe for Electronic Ignition Systems Installation Instruction
Perform the following procedure to install the Y75 sensing probe:
1. Turn off the gas at the upstream manual shutoff and disconnect power
to the appliance.
2. Disconnect the sensing probe cable from the old sensing probe.
3. Remove the old sensing probe from the pilot burner.
4. Check the length of Dimension B (see Figure 1) to ensure the correct
replacement probe is being used.
5. Compare the sensing probe rod protrusion length (Dimension A, see
Figure 1). If required, trim the length of the Y75 rod being installed to
the same length as the sensing rod being replaced.
6. Install the Y75 sensing probe into the pilot burner by applying
2-6 inch-lbs of torque.
7. Restore the power and the gas supply to the appliance.
8. Using a microammeter, check the signal passing through the sensing
probe. Refer to Table 2 for minimum flame sensing currents for
various ignition controls.
9. If the microampere signal is marginal (minimum + 0.1 microamperes),
trim the Y75 sensing probe in increments of 0.125 in. (3.17 mm),
taking care that there is still proper flame impingement on the sensing
probe.
10. Reconnect the sensing probe cable to the new sensing probe. Before
leaving the installation, observe at least three complete operating
cycles to see that all components are functioning correctly.
Table 2: Minimum Current Requirements
Product Number
Minimum Required Flame
Sensing Current in Microamperes
G60 all models, CSAs (all models except
CSA45A-601R and CSA51A-601R)
0.7 microamperes DC
G65 all models, G66 all models,
CSA45A-601R, CSA51A-601R, G600AX,
G600AY, and G670AW
0.2 microamperes DC
G770 all models,
G600KX, LX, LY, MX, NX, and RX
0.15 microamperes DC
Table 3: Replacement Guide
Sensing Dimensions
Probe Description A
B
Y75AS-1
90° Terminal Connector
Replaces Y75AA
(1.40 in.) 35.56 mm (0.34 in.) 8.63 mm
Y75AS-2
Straight Terminal Connector
Replaces Y75AA
(1.40 in.) 35.56 mm (0.34 in.) 8.63 mm
Y75BS-1
Straight Terminal Connector
Replaces Y75BA
(1.40 in.) 35.56 mm (0.57 in.) 14.47 mm
1007 South 12th Street
PO Box 170
Watertown WI 53094 www.baso.com
1-877-227-6427 (1-877-BASOGAS) Printed in U.S.A.
(5 pages)
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