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SEQUENCE OF OPERATION
On call for heat, the D-2 Power Vent fan (and appliance pump) start. When the flow switch
circuits close, the ignition system consisting of an electronic spark module, pilot gas system and
flame sensor, are energized. When draft proving switch closes and all safety circuits are
proven, the automatic main gas valves will open and the heater will operate. When the
operating limit circuit is satisfied, the heater will shut down.
11
Dimensional Data
Model A B C D
181 18.13 12.38 7.88 4.25
182 18.13 12.38 7.88 4.25
185 18.13 12.38 7.88 4.25
260 18.13 12.38 7.88 4.25
261 18.13 12.38 7.88 4.25
265 18.13 12.38 7.88 4.25
330 17.50 15.75 7.63 6.00
331 17.50 15.75 7.63 6.00
335 17.50 15.75 7.63 6.00
400 17.50 15.75 7.63 6.00
401 17.50 15.75 7.63 6.00
405 17.50 15.75 7.63 6.00
Fig #9387