The first (Kit #1) has a single sense electrode (one wire to the electrode, applicable to S/N above 920500001), the second (Kit #2) has a dual sense electrode (two wires to the electrode, applicable to S/N below 920500001).
Tune-Up Kit 1 Contents: (links in blue)
Tune-Up Kit 2 Contents: (links in blue)
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SUBURBAN FURNACE NT-34S EXPLODED PARTS VIEW LINKS
*Not Shown* 4 Inch Duct Cover (link): 050733
Item# 3 Bottom Duct Gasket (link): 062164
Item# 6 4 Inch Duct Collar (link): 050715
*Not Shown* 4 Inch Flexible Heater Duct Hose (link): E4-25
Item# 7 Thermostat, White, (link): 161154
Item# 7 Thermostat, Black, (link): 161210
Item# 8 Power Supply Harness, Outside Plug, (link): 520322
*Not Shown* Power Supply Harness, Inside Socket, (link): 520323
Item# 10 Electrode (link): 231933, Single Sense, Above S/N 920500001 (New P# 525029)
Item# 10 Electrode (link): 230956, Dual Sense, Below S/N 920500001 (New P# 525019)
*Not Shown* Ignition Lead (link): 232456
Item# 13 Electrode Gasket 070163 NLA (Use link): 071076 (New P# 525011)
Item# 18 Burner Access Door Gasket (link): 070398
Item#'s 13 & 18 Electrode / Burner Door Gasket Kit (link): 071076 (New P# 525011)
Item# 21 Limit Switch (link): 230496
Item# 35 OEM Ignition Board (link): 521099
Item# 35 After-Market Ignition Board (link): 521099MC
Item# 35 Dinosaur Electronics Ignition Board (link): FAN50PP
Item# 38 Module Board Insulator 070538 (not used with modern boards)
Item# 40 Time Delay Relay (link): 48000
Item# 42 Vent Cap & Exhaust Tube (link): 260573
Item# 43 Intake Tube, 3 Inch, (link): 050906
Item# 48 Burner Assembly (link): 010701
Item# 49 Orifice (Stamp# 51) (link): 180222
Item# 50 Manifold Gasket (link): 070408
Item# 52 Manifold (link): 171468
Item# 53 Gas Valve (link):161123
Item# 53 Gas Valve (link):161123-OS
Item# 61 Room Air Blower Wheel (link): 350113
Item# 65 Sail Switch (link): 230509 (New P# 525024)
Item# 70 Motor Mount Bracket (link): 062138 NLA
Item# 72 Crossover Tube Gasket (link): 070385
Item# 75 OEM Motor, 12VDC, (link): 521138 (Replaced P# 231208)
Item# 75 After-Market Motor, 12VDC (link): 521138MC NLA
Item# 76 Motor Gasket 070384
Item# 79 Combustion Air Wheel 350110
Item# 81 Combustion Air Housing Gasket 070386
*Not Shown* Fan Switch 230575 Below S/N 1600851
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