04. 02. 20. Document Number 671835
4
Nuaire |
Western Industrial Estate
|
Caerphilly
|
CF83 1NA
|
nuaire.co.uk
SQFT
Installation Manual
Fan 1
Fan 2
L1
L2
L3
Auto
change-over
control with
soft-starter
control
(by others)
460V 3 phase 60 Hz supply
Mains supply via local isolator (not shown)
380V 3 phase 60 Hz supply
400V 3 phase 50 Hz supply
Soft Starter
W1
U1
V1
W2 V2 U2
W1
U1
V1
W2 V2 U2
6
Wiring - Three Phase (4kW and Above) - Single Speed
5.0 SPECIFIC COMMISSIONING AND SERVICING
REQUIREMENTS
400°C for 2 hours Units for Smoke Extract
Exposure temperature/time: 400°C for 2 hours
These units are used to provide a SAFETY FUNCTION for people
in the event of fire in public premises or in the home: they are
therefore subject to strict constraints concerning their operating and
maintenance.
Operating Constraints
i. Check on the nameplate that the selected unit corresponds to the
maximum exposure temperature and duration.
ii. Non ventilated motors MUST be placed in the airflow from the driven
fan. Ventilated motors can be placed outside the flow.
iii. AFTER THE UNIT HAS BEEN SUBJECTED TO ONE EMERGENCY
DUTY OPERATION, IT MUST BE REPLACED.
iv. With variable speed control. Ensure that the maximum speed never
exceeds the speed of the motor supplied by the mains and that the
delivered power corresponds to the previous definitions. The unit
should be equipped with PTC thermistors connected to the protection
system during S1 duty and switched off during S2 duty (operation
during an emergency).
These qualifications ensure the qualification of the driven fan by the
manufacturer.
Maintenance Constraints
Regular service visits must be performed on the installation AT
LEAST EVERY 6 MONTHS, incorporating the following checks:
i. Checking the insulation resistance (R>100 MOhms, 500V DC)
•
If the drain holes are blocked, open them to eliminate any
accumulated condensation.
•
If R<100 MOhms, dry the stator in an oven and check the
insulation resistance. If the fault persists, replace the stator.
•
The stator must be replaced 5 years after installation or after
20,000 hours of operation.
ii. Cooling check
•
Ensure there is no dust or grease in the entire ventilation circuit
(housing fins, motor cover/fan if fitted driven fan).
•
Ensure the motor runs normally when switched on for a few
minutes.
iii. Bearing check (C3 or C4 play)
Run the motor during each maintenance visit. When the motor is cold,
a high level of noise may be caused by the texture of the grease. This
does not indicate a bearing fault.
S2 duty only:
The bearings must be replaced by an identical type every 5 years.
Ensure the motor runs normally when switched on for a few minutes.
S1 duty and Emergency in S2 duty:
a) Permanently greased bearings.
400°C range; replace on 2 pole motors after 10,000 hours of operation
and on motors with 4 poles or more after 20,000 hours.
b) Re-greaseable bearings
The information on the motor nameplates must be strictly respected
(grease quantity, grease quality and re-greasing frequency).
The bearings must be replaced after 20,000 hours of operation.
6.0 MAINTENANCE
Ensure that all mechanical and electrical connections and fixings are
secure and that inlet and outlet ductwork is free of any obstruction or
debris.
Briefly switch the fan on/off to ascertain correct direction of impeller
rotation, compare with the rotational label fitted and correct if
necessary.
Complete the test by running the fan for approximately 15 minutes,
taking and comparing voltage, full load and starting currents with the
fan rating label. Monitor flexible connections to ensure no leakage and
AV mounts for correct alignment.
It is important that maintenance checks are recorded and that the
schedule is always adhered to, in all cases, the previous report should
be referred to.
6.1 Routine Maintenance
•
Clean all areas of unit and treat any areas of corrosion.
•
Check all access doors for leakage and if necessary locks should be
adjusted and any replacement gasket materials should be replaced
as required.
•
Check that safety grilles are secure and free of obstruction.
6.2 Semi-Annually
•
Thoroughly inspect the unit and its components for corrosion,
acting immediately to treat/restore any damaged areas.
•
All electrical terminals within the unit should be tightened.
•
Check all earth connections.
•
Check resilient mounts (where applicable) and replace any that
have any wear or deterioration.
•
Check motor for undue wear, signs of overheating and apply
winding insulation and continuity tests.