Bard CH5S1 Manuel D’Utilisation

Manual 2100-455M 

Page 

27 of 28

Disconnect power from unit before removing or replacing 
connectors, or servicing motor.  To avoid electric shock from 
the motor’s capacitors, disconnect power and wait at least 5 
minutes before opening motor.

Symptom 

• This is normal start-up for ECM

• Check blower turns by hand

• No movement 

• Check power at motor

 

• Check low voltage (24 Vac R to C) at motor

 

• Check low voltage connections

 

  (G, Y, W, R, C) at motor

 

• Check for unseated pins in connectors on  

 

   motor harness

 

• Test with a temporary jumper between R - G

 

• Check motor for tight shaft

 

• Perform motor/control replacement check

 

• Perform Moisture Check

• Motor rocks,  

• Check for loose or compliant motor mount

  but won’t start 

• Make sure blower wheel is tight on shaft

 

• Perform motor/control replacement check

• It is normal for motor to oscillate with no load 

  on shaft

• Varies up and down 

• Check line voltage for variation or “sag”

  or intermittent 

• Check low voltage connections

 

  (G, Y, W, R, C) at motor, unseated pins in 

 

  motor harness connectors

 

• Check “Bk” for erratic CFM command (in 

 

   variable-speed applications)

 

• Check out system controls, Thermostat

 

• Perform Moisture Check

• “Hunts” or “puffs” at 

• Does removing panel or filter reduce 

  high CFM (speed) 

  “puffing”?

 

 - Reduce restriction

 

 - Reduce max airflow

• Stays at low CFM 

• Check low voltage (Thermostat) wires and

  despite system call 

  connections

  for cool or heat CFM 

• Verify fan is not in delay mode; wait until 

 

   delay complete

 

• “R” missing/not connected at motor

 

• Perform motor/control replacement check

• Stays at high CFM 

• “R” missing/not connected at motor

 

• Is fan in delay mode? - wait until delay time

 

  complete

 

• Perform motor/control replacement check

• Blower won’t shut off 

• Current leakage from controls into G, Y or W?

 

  Check for Triac switched thermostat or solid-

 

  state relay

 

• Determine if it’s air noise, cabinet, duct or

 

  motor noise; interview customer, if necessary

• Air noise 

• High static creating high blower speed?

 

 - Is airflow set properly?

 

 - Does removing filter cause blower to slow

 

   down?  Check filter 

 

 - Use low-pressure drop filter

 

 - Check/correct duct restrictions

Symptom 

• Noisy blower or cabinet 

• Check for loose blower housing, panels, etc.

 

• High static creating high blower speed?

 

  - Check for air whistling through seams in

 

     ducts, cabinets or panels

 

  - Check for cabinet/duct deformation

• “Hunts” or “puffs” at 

• Does removing panel or filter reduce

   high CFM (speed)

 

   “puffing”?

 

  - Reduce restriction

 

  - Reduce max. airflow

• Motor failure or  

• Replace motor and Perform Moisture Check

  malfunction has occurred
  

and moisture is present

• Evidence of moisture 

 

• Perform Moisture Check

  present inside air mover

Do 

• Check out motor, controls,  • Automatically assume the motor is bad.
  wiring and connections 
  thoroughly before replacing
  motor

• Orient connectors down so  • Locate connectors above 7 and 4 o’clock
  water can’t get in 

   positions

 - Install “drip loops”

• Use authorized motor and  • Replace one motor or control model # with
  model #’s for replacement     another (unless an authorized replacement)

• Keep static pressure to a  

• Use high pressure drop filters some have ½"

  minimum: 

   H20 drop!

 - Recommend high 

• Use restricted returns

   efficiency, low static filters

 - Recommend keeping filters
   clean.
 - Design ductwork for min.
   static, max. comfort
 - Look for and recommend
   ductwork improvement,
   where necessary

• Size the equipment wisely  • Oversize system, then compensate with low

 

    airflow

• Check orientation before 

• Plug in power connector backwards

  inserting motor connectors  • Force plugs 

• Connectors are oriented “down” (or as recommended by equipment
  manufacturer)

• Arrange harness with “drip loop” under motor

• Is condensate drain plugged?

• Check for low airflow (too much latent capacity)

• Check for undercharged condition

• Check and plug leaks in return ducts, cabinet

• Check proper airflow settings

• Low static pressure for lowest noise

• Set low continuous-fan CFM

• Use humidistat and 2-speed cooling units

• Use zoning controls designed for ECM that regulate CFM

• Thermostat in bad location?