FläktGroup HT Series Installation guide

Brand: FläktGroup

Model: HT Series

Type: Installation guide

HT SERIES

SMOKE VENTING

EQUIPMENT

» SAFETY, INSTALLATION AND MAINTENANCE INSTRUCTIONS

PART NO. 412111

AIR MOVEMENT

FIRE SAFETY

HT200°C OR HIGHER FOR 2 HOURS

CONTENTS

GENERAL SAFETY WARNING

INSTALLATION, OPERATION AND MAINTENANCE

INSTRUCTIONS

SITE STORAGE, SUPPLY, INSTALLATION

OPERATING CONDITIONS

CONNECTION

CABLE

CONTROL

MAINTENANCE

LUBRICATION

TESTING (FANS AND CONTROLS)

LONG TERM RELIABILITY

PARAGRAPHS

HT Series Smoke Venting Equipment

FANS FOR EMERGENCY OPERATION AT HIGH AMBIENTS FOR A LIMITED PERIOD

1. SAFETY

This product contains rotating parts and electrical connections which can be a danger and cause injury. It is

of paramount importance for any fan that is required to function in emergency conditions, that the installer and

user must follow all relevant instructions in this leaﬂet, as well as those contained in the general Instruction

Leaﬂet supplied with this product.

To ensure that fans will operate continuously during a high air temperature emergency, the electrical system

must have been designed and installed to accommodate the speciﬁc emergency conditions of temperature and

duration. A maintenance procedure must be put in place and a record of the activities that have been performed

must be kept.

2. INSTALLATION, OPERATION AND MAINTENANCE INSTRUCTIONS

These instructions apply to all axial fans, including Aerofoils, Bifurcated Fans and UDA Roof Units. They must be

read in conjunction with those in the standard Instruction Leaﬂet for these fans:- Aerofoil Fans:- Pt. No. 416421

3. SITE STORAGE, SUPPLY, INSTALLATION

Refer to the above instruction leaﬂet . When fans are retained in storage, access by un-authorised persons

must be prevented with the use of guards, barriers or secure premises to ensure that fan impellers which may

be rotating do not present a hazard.

For 600°C Bifurcated fans in fully-immersed conditions please enquire for speciﬁc installation instructions.

4. OPERATING CONDITIONS

Under emergency conditions, these fans are suitable for the temperature/time capability given on the name

plate or in the accompanying documentation. e.g. “HT300/1” is suitable for a single use at 300°C for 1 hour.

Bifurcated fans can operate up to 600°C for 2 hours provided that the air temperature at entry to the motor

compartment does not exceed 50°C. When an emergency air temperature above 400°C has to be allowed for, it

will be necessary to provide means of ducting heated air from the motor compartment to a safe location and to

supply cooling air to the motor, at less than 50°C.

Unless otherwise stated fans are suitable for continuous operation, prior to the emergency, in ambient

temperatures of -40 to +40°C. They are only suitable for start-up between -20 to +40°C (Roof Units can be used

up to +50°C). On the fan nameplate, the maximum temperature may be shown as +40°C but when

installed for emergency use, the temperature/time capability will be as shown on the special label adjacent to

the main nameplate.

5. CONNECTION

The wiring to the fan must be in accordance with the connection diagram in the terminal box.

Fans are designed primarily for 3 phase electrical supply but some smaller fans are available for 1 phase

supply. Where 1 phase fans are to be installed, the capacitor must be mounted well outside the potential high

temperature area. On commissioning, the rotation of the impeller should always be checked.

6. CABLE

Suitable ﬁre-resistant cable should be used between the main supply, starter controls and the fan. The mains

supply should be from a guaranteed or separately maintained source, to enable the fan to continue running

under emergency conditions.

Duct-mounted terminal boxes for all HT fan speciﬁcations are designed to accommodate MICC supply cables.

PT 407212

7. CONTROL

High Temperature rated fans must be run Direct-on-Line during their emergency [high temperature] operation.

Operating the fan at 100% speed through an inverter “Fire Mode” is not permitted except for Fläkt Woods’

approved drives and fan/drive combinations.

Soft-start of HT fans and speed control of fans during day-to-day mode is permitted using non-approved

drives so long as the drive is by-passed from the circuit once up to full speed. Drives must not be located in

the same ﬁre compartment as the extract fans unless suitably protected and provided with cooling air. Drives

must be connected to the fans using appropriate HT cable for the application.

Over-heat protection, Vibration sensors, Bearing sensors and inverter motor over-heat protection circuits must

be disabled during emergency mode if provided.

8. MAINTENANCE

For normal operation and planned preventative maintenance please refer to document 416421.

AT 3 MONTHLY INTERVALS WHEN FANS ARE NOT NORMALLY RUN

If the fan is intended for emergency use only, the resistance of the

windings to earth should be measured (at 500v dc). If the resistance is

found to be less than 10 megohms, the motor should be dried out and

re-checked. Run the motor for at least 15 minutes to prevent hardening

of the grease and corrosion of the bearing.

AT 6 MONTHLY INTERVALS

On bifurcated fans only; remove the impeller and check the

condition of the shaft packing seal located behind the shaft seal

retaining plate. Replace the packing seal (Part No. 407212) if

necessary.

9.LUBRICATION

ATTENTION!

It is necessary to record the number of hours the motor has operated in order to determine when

bearing relubrication is required. If the motor is not running continuously, the date of installation

must be recorded, since relubrication is recommended every six months, even if the motor was not

run during this time.

ATTENTION!

Beware of all rotating parts!

Grease can cause skin and eye irritation when regreasing. Follow all safety precautions speciﬁed

by the grease manufacturer.

SHIELDED/SEALED BEARINGS

Small motors (frame 80-132) which are ﬁtted with ‘sealed for life’ ZZ/2Z bearings, greased for life must be

replaced after 20,000 running hours. Check motor nameplate for determining the bearing type used.

MACHINES FITTED WITH GREASE NIPPLES

Motor grease nipples are usually ﬁtted to 160 frame motors and above. Regular maintenance and adherence to

re-greasing procedures will prolong bearing life. Failure to do this may shorten bearing life considerably.

Maintenance includes:

a) Attention to the overall bearing status;

b) Cleaning and lubrication;

c) Detailed inspection of the bearings.

Although a well tuned ear can often distinguish unusual noises, more sophisticated equipment should be used

to obtain a quantiﬁed bearing analysis.

Bearings should be lubricated to avoid metallic contact of the moving parts, and also for protection against

corrosion and wear. Lubricant properties deteriorate in the course of time due to mechanical operation,

furthermore, all lubricants are subject to contamination under working conditions. For this reason, lubricants

must be renewed or replenished from time to time.

NOTE!

Bearings with grease nipples facilities must be replaced after 40,000 running hours.

LUBRICATIONS INTERVALS

ATTENTION!

If Krytox GPL226 grease is supplied, it may cause higher noise levels particularly at low

temperatures, or when intermittent duty does not allow a running temperature above 20 °C in the

bearing. Please contact Fläkt Woods if the service temperature is below -5 °C.

Type of grease, lubrication intervals, amount of grease and type of bearing and clearance are indicated on the

motor nameplate. Lubrication intervals depend on motor size, speed, working conditions, type of grease used

and ambient temperatutre.

NOTE!

If the supplied motor was intended for horizontal operation, but is operated in a vertical position,

the lubrication intervals should be reduced by half.

QUALITY AND AMOUNT OF GREASE

Correct lubrication is important for proper bearing operation, i. e., grease must be applied correctly and in

sufﬁcient amount. A lack of grease or excessive greasing may cause bearing damage.

ATTENTION!

It is recommended to measure the weight of one shot of grease, in order to determine the

number required to match the quantity on the motor nameplate.

Excessive greasing causes overheating due to high resistance caused by the rotating parts and, in particular,

by the lubricant compacting and losing its lubricating characteristic. Excess of grease may cause leakage and

motor winding contamination. Lack of greasing causes overheating due to high friction between the rolling

elements and the outer ring and inner race, which result in premature bearing failure.

GREASE COMPATIBILITY

Incompatibility between different grease types can cause problems.

ATTENTION!

Never mix greases of different bases.

Example: lithium-based grease should never be mixed with sodium or calcium-based grease.

ATTENTION!

To avoid any eventual grease incompatibility, always regrease bearings with the grease type

indicated on the motor nameplate.

As a general rule, greases with the same speciﬁcation are compatible, however this is dependant on the

formula. Before mixing grease types, therefore, please consult the grease supplier.

DRIVE END AND NON-DRIVE END BEARING RELUBRICATION STEPS

1. Before lubricating the bearing, clean the area around the grease nipples with clean cotton cloth;

2. With the motor running, add the amount of grease indicated on the bearing nameplate;

3. Leave the motor running for sufﬁcient time to spread the grease on the bearing;

4. Check bearing temperature to make sure there is no signiﬁcant variation.

NOTE!

On ﬁrst start or after a bearing re-lubrication there may be a slight temperature rise for the initial

10-20 hours.

If the motor can not be lubricated while it is running, lubrication can be carried out while a machine is at a

standstill, proceeding as below:

1. Inject about half amount of required grease, and run the motor at full speed for 5 minutes;

2. Switch off the motor and inject the remaining grease;

3. Start the motor again to spread the grease internally.

ATTENTION!

The bearing life is estimated by calculations according to ISO 281:2007-02 to give a L10 life. Beyond

each periodical maintenance, our recommended bearing condition check frequency is at each

lubrication. Depending on the results, bearing may need replacing.

ATTENTION!

The lubrication intervals are based on a bearing operating temperature of 75°C (frames 63 to 200)

and 85°C (frames 225 to 500). Some designs may vary. An increase of the ambient temperature

raises the bearing temperature correspondingly. For each 15°C of temperature rise, the relubrication

period should be halved.

ATTENTION!

160 frame motors mounted inside fan ducts, and with grease nipples, should have external grease

nipples mounted on the exterior of the duct with a nameplate afﬁxed advising the type, quantity and

re-lubrication interval of the grease.

MOTORS WITHOUT LUBRICATORS

Motor frame sizes less than 132 or motors not ﬁtted with lubricators operating in ambient temperatures up to

50°C; the motor should be dismantled, shaft seals and bearings replaced and relubricated after 20,000 hours

running, or 3 years, whichever is the shorter, (10,000 hours where motor speed exceeds 1800 rpm).

To relubricate motors in airstream above 300°C, the special grease used has a very low ﬁll requirement and

these fans, therefore, do not have relubrication facilities. The old grease should be washed out with its

designated solvent. The bearings should be reﬁlled with grease leaving the housing empty. If a bearing is

removed from the rotor, it should be discarded and a new one ﬁtted, using the approved grease.

10. TESTING (FANS AND CONTROLS)

It is recommended that the system is tested for emergency operation every 6 months. This test should review all

elements of the system [fans, controls, dampers etc] for correct operation.

Note: Fans should only be run for short periods as no thermal overloads are in circuit for emergency condition.

11. LONG TERM RELIABILITY

Consideration should be given by the responsible Engineer, to a major reﬁt after operation for 50,000 hours. This

would involve rewinding with materials of equivalent thermal endurance and replacement of bearings.

Guidance on the time span prior to re-ﬁt can be given by Fläkt Woods Limited on receipt of full operational

information, duty cycle, “HT” category, and other nameplate data. To maintain CE marking of High Temperature

Fans; motor rewinds must be conducted by Fläkt Woods.

THIS LEAFLET SHOULD BE PASSED TO THE USER TO ENABLE THE FAN TO BE MAINTAINED

IN A SAFE CONDITION.

WWW.FLAKTWOODS.COM

WE BRING

BETTER AIR™

TO LIFE

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FläktGroup HT Series Installation guide

FläktGroup HT Series Installation guide

FläktGroup HT Series Installation guide

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