Unique equipment identifiers - Johnson Controls - LIT-12011950 - Building automation software - Smart Equipment Controller - 5.0

Smart Equipment Controls Sequence of Operation Technical Bulletin

Product name
Smart Equipment Controller
Document type
Technical Bulletin
Document number
LIT-12011950
Version
5.0
Revision date
2024-06-06
Product status
Active
Figure 1. 2 stage compressor on circuit 1 with a single compressor on circuit 2
Figure 2. Display - 2 stage Cir1 with single Cir2
  • HGR operation is associated with the C2 output.
  • Modulating HGR operation is available.
  • HGR Binary output is associated with reheat coil bleed valve functionality.
  • Both condenser fan outputs need to be active any time a compressor is active. CF2 may be turned off if HGR operation is active and outdoor air temp is too low.
  • 2 stage make/break percentages adjusted to account for capacity differences.
  • C3 output is linked to C1 faults/sensors
  • Evaporator Leaving Air temperature uses the EC4 analog input on the 4 stage board. Refer to the Installation manual for compressor staging information.
Figure 3. Tandem compressors on circuit 1 with a single compressor circuit 2
Figure 4. Display - Tandem Cir1 With Single Cir2
  • HGR operation is associated with the C2 output.
  • Modulating HGR operation is available.
  • HGR Binary output is associated with reheat coil bleed valve functionality.
  • Both condenser fan outputs are active any time a compressor is active. CF2 will be turned off if HGR operation is active and outdoor air temp is too low or maximum modulation has been reached.
  • Tandem circuit make/break percentages are adjusted to account for capacity difference.
  • C3 output is linked to C1 faults/sensors.
  • Evaporator Leaving Air temperature uses the EC4 analog input on the 4 stage board when modulating HGR is in use.

Method (non-HGR functionality) implementation

  • The display information is automatically configured to ignore the normal sensors associated with the C3 and C4 outputs. However, the Cooling Stage 3 area will still display many applicable indications (Status, Command, Runtime, etc). All Cooling Stage 4 parameters are hidden.
  • The EC4 input is rerouted to the Evaporator Leaving Air Temp if modulating HGR is used.
  • Start Count minimization functionality enforced
Figure 5. Inverted Single Compressor on Circuit 1 with Single Compressor on Circuit 2
Figure 6. Display View - Inverted Single Cir1 With Single Cir2
  • HGR operation is now associated with the C2 output (hence the term “inverted”).
  • Modulating HGR operation is available
  • HGR Binary output is associated with reheat coil bleed valve functionality
  • Both condenser fan outputs are active any time a compressor is active. CF2 may be turned off if HGR operation is active and outdoor air temp is too low or maximum modulation is reached.
  • Evaporator Leaving Air temperature uses the EC4 analog input on the 4 stage board when modulating HGR is in use.

Method (non-HGR functionality) implementation

  • The EC4 input is rerouted to the Evaporator Leaving Air Temp.
  • 2 stages of cooling are available, with make/break points at approximately 50%, and 100%.
  • Start Count minimization functionality enforced.
Figure 7. Ultra high efficiency unit with tandem compressors on Circuit 1 with 2 stage compressor on Circuit 2
Figure 8. Display - tandem Cir1 with 2 stage Cir2
  • Fully load circuit 1 when utilizing HGR
  • Ignore faults/sensors normally used with C3 and C4 outputs (example: EC3, LPS3, LPS4)
  • Apply faults/lockouts to appropriate devices (example: LPS1 applies to C4)
  • Hide Lead/Lag configuration point. Default is always set to disable this functionality.

Implementation method

  • When a demand to energize the HGR valve with the C1 output is present, the C4 output is automatically tied to C1 output.
  • The display information is automatically configured to ignore the normal sensors associated with the C3 and C4 outputs. However, the Cooling Stage 3 and Cooling Stage 4 areas will still display many applicable indications (Status, Command, Runtime, etc).
Figure 9. Ultra high efficiency unit with dual 2 stage compressors
Figure 10. Display - 2 Stage Cir1 With 2 Stage Cir2
  • Fully load circuit 1 when utilizing HGR.
  • Ignore faults/sensors normally used with C3 and C4 outputs (example: EC3, LPS3, LPS4).
  • Hide Lead/Lag configuration point. Default is always set to disable this functionality.

Implementation method

  • When a demand to energize the HGR valve with the C1 output is present, the C3 output is automatically tied to C1 output.
  • The display information is automatically configured to ignore the normal sensors associated with the C3 and C4 outputs. However, the Cooling Stage 3 area will still display many applicable indications (Status, Command, Runtime, etc). All Cooling Stage 4 parameters are hidden.

Condenser fan and compressor logic for non-standard Unique equipment identifier

The following table shows what compressor stages will turn on each condenser fan for every unique equipment identifier.

Unique Equipment Identifier CF1 CF2
Standard C1, C2 C3, C4
Tandem Cir1 With 2 Stage Cir2 C1, C4 C2, C3
2 Stage Cir1 With 2 Stage Cir2 C1 C2
2 Stage Cir1 With Single Cir2 C1, C2, C3 C1, C2, C3
Tandem Cir1 With Single Cir2 C1, C2, C3 C1, C2, C3
Inverted Single Cir1 With Single Cir2 C1, C2, C3 C1, C2, C3
Single Modulating Cir1 With 2 Stage Cir2 C1 C2, C3
Single Modulating Cir1 With Single Cir2 C1 C2