AHRI APEX, Installation, Operating And Service Instructions

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107
Heat Exchanger Components
Key
No.
Description
Part Number
APX425 APX525 APX625 APX725 APX825
1A Air Vent Valve 101586-01
1B Supply/Return Water Temperature Sensor (2 per boiler) 101685-01
1C High Limit Water Temperature Sensor 101653-01
1D
Replacement Rear Insulation Disc Kit (includes insulation,
disc, thermal link switch and instructions)
(Warning: Contains RCF)
104998-01
1E Flue Exit Gasket Replacement Kit (includes gasket and
dielectric grease)
104501-01 104502-01
1G Temperature and Pressure Gauge (not shown) 100282-01 103470-02
1H
Safety Relief Valve (not shown) 50 PSI: 103837-01 60 PSI: 81660375
Alternate Safety Relief Valve Kit (not shown, includes safety
relief valve and temperature and pressure gage
80 PSI: 104200-01
100 PSI: 104201-01
1J Boiler Drain Valve, 3/4 in. NPT (not shown) 806603061
XIII. Repair Parts
(continued)
Burner Components
Key
No.
Description
Part Number
APX425 APX525 APX625 APX725 APX825
1K Replacement Burner Kit (includes burner, burner head seal
and hardware)
104988-01 104989-01 104990-01 104991-01
1L
Replacement Burner Door Kit (includes door, burner door
inner and outer seals, gaskets for sensor and ignitor,
insulation and thermostat; does not include igniter or flame
sensor)
104992-01 104993-01
1M Burner Door Insulation (Warning: Contains RCF) 101728-01 103610-01
1N Replacement Flame Sensor Kit (includes gasket and
hardware)
103339-01 103310-01
1O Replacement Igniter Kit (includes gasket and hardware) 103005-01 103005-02 103308-01
1P Replacement Gas/Air Duct Kit (includes duct gaskets and
hardware)
104994-01 104995-01 104996-01
1Q Burner Gasket 102739-01 104986-01
1R Burner Door Outer Seal 101730-01 104985-01
1S Burner Door Thermostat with Manual Reset 104569-01
1T Burner Door Hex Flange Nut, M6 x 1.0 mm (6 per boiler) 101724-01