Service manual

TABLE OF FIGURES
Figure 1: UHD[T][M][X][S][R] 150-175 Label Placement...........2
Figure 2: UHD[T][M][X][S][R] 200-250 Label Placement...........3
Figure 3: UHD[T][M][X][S][R] 300 – 400 Label Placement........4
Figure 4: Clearances to Combustibles ......................................7
Figure 5: Air Flow Direction .......................................................9
Figure 6: Suspension Methods ............................................... 10
Figure 7: Vent and Roof Detail ................................................ 13
Figure 8: Standard Vented Heater - Vertical and Horizontal
Vent Termination ...................................................... 13
Figure 9: Standard Vented Heater - Common Vertical Vent
Termination.............................................................. 14
Figure 10: Separated Combustion Heater - Vertical and
Horizontal Vent Termination ................................... 15
Figure 11: Concentric Vent Box ............................................... 15
Figure 12: Concentric Vertical and Horizontal Vent
Termination - Separated Combustion Heater ......... 16
Figure 13: Gas Connection ..................................................... 19
Figure 14: Automatic Burner Control Sequence ......................29
Figure 15: Single Stage Gas Valve for Models UHD[X][S][R]
150 – 400 ...............................................................29
Figure 16: Two Stage Gas Valve for Models UHD[T][X][S][R]
150 - 400................................................................30
Figure 17: Modulating Gas Valve for Models UHD[M][X][S][R]
150 - 400................................................................30
Figure 18: LED Diagnostic Codes ...........................................34
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