Method Statement For Air Balancing in HVAC System
Method Statement For Air Balancing in HVAC System
Method Statement For Air Balancing in HVAC System
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HVAC MOS
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HVAC MOS
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HVAC MOS
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HVAC MOS
the terminal index will rise. This does not affect the balancing
procedure since each terminal being adjusted is related in turn with the
index.
When all the terminals have been balanced on a sub-branch, each
terminal will be running with an equal percentage of the design flow
rate, within the allowable tolerances.
The flow rates at each terminals must be measured and recorded.
Once again a summation should be made to check that the total is in
reasonable agreement with the measured sub-branch flow.
Test results shall be recorded in the approved test sheets and
documents.
Air Balancing for Staircase Pressurization Fan
Check all pre-commissioning checks has been carried out.
Check Fire alarm interfacing and actuation will be done by the
specialist.
Set the all dampers in the grill outlet at full open position.
Take the initial flow of fan by adding up all the measured volume
from each outlet (Initial scan)
Compare the readings against the design volume, find the percentage
of design flow rate.
Find the index outlet (least favoured outlet) from the scan.
Keep the index outlet damper fully open.
Then throttle the air volume at each outlet to get the design percentage
of flow proportionally by anemometer with effective area.
Each time when you throttle the outlet by closing the damper, the
index outlet the air flow rises gradually, measure the index point of
each time.
Balance the air volume at all terminal (Including index)
proportionally.
PRESSURE MEASUREMENT
Fan functional will be checked.
All fire doors are closed during fan running will be confirmed.
Differential pressure measurement will be carried out between the
floor & stair.
Record the readings and compare with the specified pressure.
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