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Page 19
CBWMV SERIES
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 by−pass" 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: Cooling Sequence of Operation
Thermostat (S1) Provides 24 Volt Cooling Call to In-
door Blower (B3)
Blower (B3) Operates at the 2nd Stage
Cooling Speed Determined by COOL,
DELAY and ADJUST Jumper Positions on
the BDC3 Control (A52)
NO
CFM Light on A52 Indicates Blower CFM
Selection with 100CFM / Blink
Thermostat (S1) Demand Satisfied
Blower Shuts Off According to the DELAY
Jumper Position on the BDC3 Control
(A52)
Demand for Cooling Satisfied
2 Stage Condensing Unit?
Check for 24 Volts Between Y and C at A15 Terminal Strip
NO
Blower (B3) Operates at the 1st Stage Cooling Speed
Determined by COOL, DELAY and ADJUST Jumper
Positions on the BDC3 Control (A52)
CFM Light on A52 Indicates Blower CFM Selection with
100CFM / Blink
First Stage Demand for Cooling Satisfied?
Blower Operates at the 2nd
Stage Cooling Speed Deter-
mined by COOL, DELAY and
ADJUST Jumper Positions
on the BDC3 Control (A52)
Thermostat (S1) Calls for
2nd Stage Cooling
CFM Light on A52 Indi-
cates Blower CFM Selec-
tion with 100CFM / Blink
2nd Stage Thermostat
(S1) Demand Satisfied
Blower Returns to 1st
Stage Cooling Speed
Check for 24 Volts Between Y
and C on A15 Terminal Strip
Check for 24 Volts Between
Pins 6 and 3 on J49
Blower Shuts Off According to the DELAY Jumper
Position on the BDC3 Control (A52)
Check for 24 Volts Between Y2 on
TB1 and C on A15 Terminal Strip
Check for 24 Volts Between Pins 14
and 3 on J49
CONDITIONS:
Power On
Normal Operation LED: Steady Flash
Check for 24 Volts
Between Pins 14 and
3 on J49
YES
NO
NO
NO
YES
YES
YES
YES
YES
YES
YES
Demand for Cooling Satisfied
YES
NO
YES
NO
YES
YES
YES