WARNING

WARNING TO SERVICE PERSONS! Electric shock hazard. When electrical power to the internal control box components must be available for troubleshooting, a common practice is to construct a ass" of the door interlock switch. When such a by−pass is in place, a potential shock hazard is present which can cause injury or death. Make sure any door interlock switch by−pass has been removed after troubleshooting is complete and BEFORE attempting any re- pairs to the control box components!

Troubleshooting: Continuous Fan Sequence of Operation

CONDITIONS:

Power On

Normal Operation LED: Steady Flash

Thermostat (S1) Calls for Continuous Fan, G−Only

YES

Blower Operates at the Continuous Fan Speed Selected by COOL Jumper and ADJUST Jumper Positions on the BDC3 Control (A52)

YES

RUN Light on BDC3 Control (A52) illuminates to Indi- cate a Continuous Fan Call

YES

CFM Light on A52 Indicates Blower CFM Selection with 100CFM / Blink

YES

Thermostat (S1) Continuous Fan Demand Satisfied

YES

Blower Off

NO

NO

Check for 24 Volts Between ’G’ and C at A15 Terminal Strip

Check for 24 Volts Between Pins 3 and 15 on J49

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Lennox International Inc AIR HANDLERS, CBWMV Troubleshooting Continuous Fan Sequence of Operation, Yes

CBWMV, AIR HANDLERS specifications

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