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LAARS Heating Systems
U.H.E. Series Commercial Gas
Ultra High Efficiency Water Heaters
Table of Contents
U.H.E.TM
Page
Service Procedure
Introduction
3
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How to use this manual
4
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Tool required for service
4
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Specifications
5
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Sequence of Operation
8
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Troubleshooting
10
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Thermostat Circuit, Testing & Replacement
12
I
Combustion System Testing and Replacement
18
II
Burner Tube Inspection & Replacement
22
III
Gas Valve Replacement
24
IV
Blower Testing and Replacement
25
V
Exhaust Pressure Switch Testing and Replacement
27
VI
Hot Surface Igniter Testing and Replacement
30
VII
Flame Sensor Testing and Replacement
32
VIII
Ignition Module/Control Board Replacement
34
IX
Transformer Replacement
35
X
Vent Safety Switch Testing and Replacement
36
XI
Anode & Flue Baffle Inspection and Replacement
38
XII
Installation Check List
43
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Heater Service Report
44
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Parts List
45
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Glossary of Terms
48
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