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Variable Air Volume (VAV) with Variable Fre-
quency Drive
The Variable Air Volume (VAV) system utilizes a Variable Fre-
quency Drive (VFD) to modulate supply fan speed using a PID
and an analog input from a duct static pressure sensor. The supply
fan will adjust to meet the configured static set point regardless of
cooling stage. In heating mode, the latest VAV Open air terminals
offer a minimum airflow setting. This shall be configured to main-
tain the required airflow (CFM) whenever the RTU is in a heating
mode per the unit’s specification. The Open VAV terminals will
recognize the Heating or Warm-up modes as a heat mode and uti-
lize the higher airflow minimum setpoint as configured. The sys-
tem will further monitor the SAT of the RTU to determine if the
SAT is approaching the configured maximum limit. As the limit is
approached, the Linkage mode is changed to Linkage Pressuriza-
tion to ensure all terminals open to their maximum supply airflow.
Fig. 54 — Variable Frequency Drive (VFD)
Fig. 55 — VFD Location
MULTI-SPEED VFD DISPLAY KIT (FIELD-INSTALLED
OPTION)
NOTE: The Remote VFD Keypad is part of the Multi-Speed VFD
display kit (PN: CRDISKIT002A00) which is a field-installed op-
tion. It is not included with the 48LC*B14-26 base units.
230V/460V
575V ONLY
Summary of Contents for WeatherExpert 48LC B14 Series
Page 4: ...4 Fig 2 48LC B14 Vertical Airflow ...
Page 5: ...5 Fig 3 48LC B14 Horizontal Airflow ...
Page 6: ...6 Fig 4 48LC B14 Back View and Condensate Drain Location ...
Page 7: ...7 Fig 5 48LC B14 Corner Weights and Clearances ...
Page 8: ...8 Fig 6 48LC B14 Bottom View ...
Page 9: ...9 Fig 7 48LC B17 20 Vertical Airflow ...
Page 10: ...10 Fig 8 48LC B17 20 Horizontal Airflow ...
Page 11: ...11 Fig 9 48LC B17 20 Back View and Condensate Drain Location ...
Page 12: ...12 Fig 10 48LC B17 20 Corner Weights and Clearances ...
Page 13: ...13 Fig 11 48LC B17 20 Bottom View ...
Page 14: ...14 Fig 12 48LC B24 26 Vertical Airflow ...
Page 15: ...15 Fig 13 48LC B24 26 Horizontal Airflow ...
Page 16: ...16 Fig 14 48LC B24 26 Back View and Condensate Drain Location ...
Page 17: ...17 Fig 15 48LC B24 26 Corner Weights and Clearances ...
Page 18: ...18 Fig 16 48LC B24 26 Bottom View ...
Page 21: ...21 Fig 20 48LC B14 Roof Curb Details ...
Page 22: ...22 Fig 21 48LC B17 20 Roof Curb Details ...
Page 23: ...23 Fig 22 48LC B24 26 Roof Curb Details ...
Page 30: ...30 Fig 40 48LC B14 26 VAV RTU Open Control Wiring Diagram ...
Page 31: ...31 Fig 41 48LC B14 26 Power Wiring Diagram ...
Page 53: ......