Daikin Applied (UK) Ltd.
REV A
– PAGE 9. SECTION 11 ADDED. 11/03/14
Page 15 of 37
Commissioning & Testing (continued)
Pre-run Check (continued)
11) If starting a forward curved fan then care must be taken not to overload the motor
above its rated full load current. To achieve this we would recommend that the inlet
and outlet dampers are partially closed. To measure the full load current a suitable
clamp meter should be used.
12) Ensure that all access panels are in closed position and securely fastened.
Start-up Checks
After assembly of the Air Handling Unit and connecting ductwork the following checks
should be made. The fan discharge ductwork must be fully fixed to the unit before
starting up the AHU to ensure that it is not possible to touch the fan impellor. To carry
out some of these checks it may be necessary to start the fan with the access door
open or side panel removed.
Strict attention to personal safety must be adhered to at all times. All work must comply
with the Health and Safety at Work Act 1974.
Competent, well-trained personnel must be employed in the following operations:
Rotation of Fan Impeller
1)
Test run the motor and drives to ensure that the fan is rotating in the right direction.
The correct rotation direction is marked on the fan scroll. If the rotation direction is
incorrect, stop the motor and reverse any two (2) of the incoming supply lines to the
Direct on Line Starter, Star Delta Starter or the Inverter Drive. (3 phase supply).
If
required, the fan speed may be checked using a strobe light.
2) Check that there is no untoward vibration. Stop the fan and investigate if excessive
vibration is found.
3) Measure the voltage and drawn current of the motor while all panels are in position.
The drawn current must not exceed the full load current stamped on the motor
