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Service Reference Manual UNIT COMPONENTS
5-1
SRM-HW/HWC 2/99
Section 5 - Unit Components
Transformer ........................................ 5-3
Gas Valves ........................................... 5-4
White-Rodgers 25K49 ................................ 5-4
Honeywell 8105 ......................................... 5-5
Blower Control Boards ......................... 5-6
United Technologies Model 1010-611 .......... 5-6
Heatcraft Model IBC-H4C401 ..................... 5-7
Ignition Controls .................................. 5-8
Fenwal Triton 2461D.................................. 5-8
Fenwal 05-29 DSI .................................... 5-10
Integrated Blower/Ignition Controls .... 5-11
Induced Draft Blower.......................... 5-14
Burners............................................. 5-15
Manifold Orifices ................................ 5-17
Contactor .......................................... 5-18
Main (High) Limit Switch ..................... 5-19
Flame Rollout Switch .......................... 5-20
Pressure Switch ................................ 5-21
Pressure Switch Problems ........................ 5-23
Checking Pressure Switch Operation.......... 5-24
Compressors ..................................... 5-28
Tecumseh ................................................ 5-30
Copeland ................................................. 5-32
Drier-Filters ....................................... 5-34