ACC-APG002A-EN
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Cooling Only (Electric Heat) – CVZT & VVZT
Table 17. Dual compressor cooling staging (manifold)
Unit Operation Unit Response
Cool Stage 1 Compressor 1 Output ON
Cool Stage 2 Compressor 2 Output ON
Cool Stage 3 Compressor 1 Output ON + Compressor 2 Output ON
Table 18. Dual unloading compressor cooling staging
Unit Operation Unit Response
Cool Stage 1 Compressor 1 Output ON
Cool Stage 2 Compressor 1 Output ON + Compressor 2 Unloader Solenoid ON
Cool Stage 3 Compressor 2 Output ON
Cool Stage 4
Compressor 1 Output ON +Compressor 1 Unloader Solenoid ON +
Compressor 2 Output ON
Condenser Fan Operation
Thermostat, CVZT, VVZT, and VVDA
Table 19. Single condenser fan systems (cooling only)
Unit Operation Unit Response
Compressor 1 Output ON Condenser Fan Output 1 ON
Compressor 2 Output ON Condenser Fan Output 1 ON
Compressor 1 Output ON + Compressor 2 Output ON Condenser Fan Output 1 ON
Table 20. Dual condenser fan (cooling only)
Unit Operation Unit Response
Compressor 1 Output ON Condenser Fan Output 1 ON +Condenser Fan Output 2 ON
Compressor 2 Output ON Condenser Fan Output 1 ON +Condenser Fan Output 2 ON
Compressor 1 Output ON + Compressor 2 Output ON Condenser Fan Output 1 ON +Condenser Fan Output 2 ON
Table 21. Dual condenser fan - independent airstream (cooling only and heat pump)
Unit Operation Unit Response
Compressor 1 Output ON Condenser Fan Output 1 ON
Compressor 2 Output ON Condenser Fan Output 2 ON
Compressor 1 Output ON + Compressor 2 Output ON Condenser Fan Output 1 ON +Condenser Fan Output 2 ON
Electric Heat
Table 22. Electric heat staging
Unit Operation Unit Response
Electric Heat Stage 1 Electric Heat Stage 1 Output ON
Electric Heat Stage 2 Electric Heat Stage 1 and 2 Outputs ON
Appendix A
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