Johnson Controls BQ 048 User Manuals

Table of Contents

• general

  4
• SAFETY CONSIDERATIONS

  4
• INSPECTION

  4
• REFERENCE

  4
• RENEWAL PARTS

  4
• APPROVALS

  4
• PRODUCT NOMENCLATURE

  5
• INSTALLATION

  6
• ELECTRIC HEAT

  10
• ECONOMIZER/MOTORIZED DAMPER AND RAIN HOOD

  11
• POWER EXHAUST/BAROMETRIC RELIEF DAMPER AND RAIN HOOD

  11
• MINIMUM POSITION ADJUSTMENT

  12
• ENTHALPY SET POINT ADJUSTMENT

  12
• POWER EXHAUST DAMPER SETPOINT (WITH OR WITHOUT POWER EXHAUST)

  12
• INDOOR AIR QUALITY

  12
• OPERATION

  31
• CONTINUOUS BLOWER

  31
• INTERMITTENT BLOWER

  31
• NO OUTDOOR AIR OPTIONS

  31
• ECONOMIZER WITH SINGLE ENTHALPY SENSOR -

  32
• ECONOMIZER WITH DUAL ENTHALPY SENSORS -

  32
• ECONOMIZER (SINGLE OR DUAL) WITH POWER EXHAUST -

  32
• MOTORIZED OUTDOOR AIR DAMPERS -

  32
• HIGH-PRESSURE LIMIT SWITCH

  32
• LOW-PRESSURE LIMIT SWITCH

  32
• FREEZESTAT

  32
• LOW AMBIENT COOLING

  33
• WITH OR WITHOUT ELECTRIC HEAT

  33
• DEFROST MODE

  34
• FORCED DEFROST

  34
• START-UP (COOLING)

  35
• TROUBLESHOOTING

  35
• MAINTENANCE

  38