Fan Calibration - Accurex XRRS Series Installation, Operation And Maintenance Manual

Fan Calibration

NOTE
Integral fan – front recirculating models shouldn't have
to be calibrated, as these require no added ductwork.
Fan calibration is necessary for integral fan – rear
discharge and external fan configurations (both inline
and fan by others).
NOTE
To avoid poor hood performance, it is important for
the hood to be balanced for the designed CFM. For
NFPA 101 compliant models, 500 designed CFM is
required.
Hood
NFPA 101
Length
Compliance
(in.)
Integral Fan – Front Recirculating
Integral Fan – Rear Discharge
No
External Fan - Top Discharge
30 External Fan - Top Discharge
Integral Fan - Rear Discharge
Yes External Fan - Top Discharge
External Fan - Top Discharge
Integral Fan – Front Recirculating
Integral Fan – Rear Discharge
No
External Fan - Top Discharge
36 External Fan - Top Discharge
Integral Fan - Rear Discharge
Yes External Fan - Top Discharge
External Fan - Top Discharge
Once balancing is complete, press the back arrow button to navigate back to the previous screen.
16 Fire Ready Hood
External
Ventilation
Fan Type
Not applicable
Not applicable
Inline
Fan by Others
Not applicable
Inline
Fan by Others
Not applicable
Not applicable
Inline
Fan by Others
Not applicable
Inline
Fan by Others
Once hood and fan (if external) is installed and powered,
navigate into the service menu on the user interface.
Navigation instructions can be found on pages 20-21.
Press the "Balance Exhaust Fan" button, and fan will
turn on and ramp to full speed.
Once fan is on, connect one end of manometer to
plenum pressure port (1/8 inch MNPT barb located near
grease filter) and take reading. Adjust the max speed as
necessary to match the pressure with the corresponding
value on the screen (or reference the table below based
on your hood size and configuration).
For example, for a 36 inch, non-NFPA 101 compliant,
external fan – top discharge, inline fan configuration
model, to obtain the designed 300 CFM, we need the
plenum pressure reading to be 0.25 in. wc.
Plenum Pressure
High
Reading for Percent of
CFM
Designed CFM Max CFM
.21 250
.27 250
.13 250
.13 250
.67 500
.34 500
.34 500
.28 300
.20 300
.25 300
.25 300
.54 500
.62 500
.62 500
High Low
Approximate
Percent of
Low CFM
Max CFM
70% 214
50% 300
100% 150
100% 150
80% 375
100% 300
100% 300
60%
(Default)
80% 225
50% 360
100% 180
100% 180
100% 300
100% 300
100% 300