8
Compressor Staging .................................................................................................................................... 66
Cooling Only (Electric Heat) – CVZT & VVZT .......................................................................................... 66
Dual compressor cooling staging (manifold or independent) .......................................................... 66
Dual unloading compressor cooling staging (10 and 20 ton)............................................................ 66
Heat Pump – CVZT & VVZT ..................................................................................................................... 66
Dual compressor cooling staging (manifold or independent) .......................................................... 66
Constant Volume/Multi-Speed Fan Space Temperature Control (CVZT) ................................................. 67
Space Temperature Recovery ................................................................................................................ 67
Supply Fan Control ................................................................................................................................. 67
Constant Volume/Multi-Speed Fan Space Temperature Control (CVZT) Chart ................................... 68
Variable Volume Fan Space Temperature Control (SZVAV/VVZT) ........................................................... 69
Supply Fan Control ................................................................................................................................. 69
Variable Volume Fan Space Temperature Control (SZVAV/VVZT) Chart ............................................. 70
VVZT DAT Control Mode ............................................................................................................................ 71
Supply Fan Speed Control .......................................................................................................................... 72
Single-Speed, belt-driven fans ............................................................................................................... 72
2-Speed & Variable Speed VFD-driven fans .......................................................................................... 72
Supply Fan Status Points ........................................................................................................................ 72
Single-Speed ....................................................................................................................................... 72
VFD-driven .......................................................................................................................................... 72
Fan Setpoints with VFD-driven Fan Types ............................................................................................. 72
Supply Fan Maximum Speed Setpoint ............................................................................................... 72
Supply Fan Minimum Speed Setpoint ............................................................................................... 73
Supply Fan Percentages ............................................................................................................................. 73
Multi-speed minimum supply fan speeds ............................................................................................. 73
Variable speed minimum supply fan speeds ......................................................................................... 73
Airflow Adjustments .................................................................................................................................. 74
Constant Volume Units .......................................................................................................................... 74
2 Stage Airflow/Single Zone VAV (Symbio Cond Only) ......................................................................... 74
2 Stage Airflow (Electromechanical Cond Only) .................................................................................... 74
Symbio TR-150 VFD Parameters ................................................................................................................ 75
VFD Parameter Info ................................................................................................................................ 77
VFD Harness Part Numbers .................................................................................................................... 77
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