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9 - SYSTEM START-UP
9.9.6 - Positioning of the pressure tappings
Warning!
The supply for the pressure tappings is shown in the diagram below, for all flow directions:
Measurement points for delta p
A - B - C - D
Glass pipe
The pressure connections are used to measure the delta p between the three points:
P 1
Between the front section and after the wheel and the bypass in the Fresh Air section
P 2
Between the front section and after the wheel and the bypass in the Exhaust Air section
P 3
Between the Fresh Air and Exhaust Air sections
9.9.7 - Handling
- For certain sizes, the rotary partial heat exchanger comprises a self-contained block. This block is supplied resting on its rear
surface. See connection section (see § 7.9 Heat recovery units)
9.10 - Check after start-up
■ Water flow check:
- For each pan connection to the drainage network, make sure the water drains correctly from the pan (no retention) and that the
water in the siphon is still present. In the event of a problem, refer to § 7.1 Siphons.
- If the water does not drain correctly, make sure the unit is horizontal (see Installation section, § 6.3 Assembling the blocks).
- If a steam humidifier is installed, make sure there are no low points on the steam connection tubing.
■ Mechanical noise check:
In case of abnormal noise, check that:
- The transport chocks have been removed,
- The impellers are correctly centred on the sections,
- The impellers rotate freely when powered off,
- The impellers are correctly balanced,
- The impellers rotate in the correct direction,
- The belts are correctly tensioned,
- There is no vibration.
■ Air noise check:
In case of abnormal noise:
- Check the mountings of the connection ducts at the unit's inlet and outlet.
- If the noise is caused by a leak at a block connection, make sure the gasket is correctly positioned (see § 6.3 Assembling the
blocks).
- If the noise is caused by a leak at the door, adjust the hinges and handles.
- If the noise is caused by air passing through a damper, make sure that the servomotors are correctly set (opening/closing), based
on the site requirements.
- Incorrectly sized ducts resulting in excessive air speed may also cause this type of problem. The air duct network must therefore
be balanced before a problem can be assumed on the AHU.
60
C
Exhaust air
Fresh air
A
B
D
delta p
2
D
3
delta p
B
delta p
1
A
B
C
D
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