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 |