Service Manual

3
Table of Contents
Service Procedure
Specifications………………………………………………………
…...
53
- - -
Features……..……………………………………………………..
54
- - -
Sequence of Operation…………………………………………..
55
- - -
Troubleshooting…………………………………………………..
56
- - -
Thermostat Circuit Testing and Replacement………………….
70
I
Combustion System Testing and Replacement………………..
74
II
Burner Tube Inspection and Replacement…………………….
78
III
Gas Valve Replacement………………………………………....
80
IV
Blower Testing and Replacement……………………………...
81
V
Exhaust Pressure Switch Testing and Replacement………...
83
VI
Flame Sensor Testing and Replacement……………………..
86
VII
Spark Rod Gap Adjustment and Replacement……………….
88
VIII
Ignition Module/Control Board Replacement………………….
90
IX
Transformer Replacement………………………………………
91
X
Vent Safety Switch Testing and Replacement ….…………...
92
XI
Flue Baffle Inspection and Replacement……………………..
94
XII
Powered Anode Replacement …………………..……………..
95
XIII
Installation Checklist…………………………………………….
96
- - -
Notes……………..……………………………………………….
96
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Page
Section 2: Serial Numbers “XL-” (Nov. 2021) and Later
with -895 Designator
3