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HT SERIES SMOKE VENTING EQUIPMENT
Fans for emergency operation at high ambients for a limited period
1. SAFETY
Warning and safety information relevant to specific operations are contained within each section. The following warning
or advice categories are used:
DANGER!
Failure to follow these instructions may result in serious injury or death to the user in addition
to serious damage to the equipment.
WARNING! Failure to follow these instructions may result in minor injury or damage to the equipment.
CAUTION! Failure to follow these instructions may result in malfunction or damage to the equipment
DANGER!
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 contained within this leaflet, as well as those contained within our general
Instruction leaflet, which is 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 Aerofoil and Bifurcated Fan variants. They must be read in conjunction with
advice related to our standard temperature fans (see sections 12 onwards). Note: Where fans have a foot mounted motor
fitted, then the motor mounting feet must be positioned underneath the motor. Foot mounted motors must never
be suspended from their mounting feet. If in doubt, please refer to Woods Air Movement UK (Colchester Office).
3. SITE STORAGE, SUPPLY, INSTALLATION
WARNING!
When fans are stored (prior to installation), please ensure that access by un-authorised persons is prevented,
by using guards, barriers or secure premises to ensure that fan impellers (which may be rotating) do not present
a hazard. For more specific advice please refer to sections 12 onwards.
These instructions relate to all fans rated up to and including 600°C for 2 hours which are designed to be mounted into
or on the end of ductwork that is situated outside the fire zone. All fans (including our F600 Bifurcated fan range) are
also certified for use within fully immersed conditions (i.e. mounted inside the fire zone). However, in this case, when
using our F600/F400 Bifurcated fan range, please request additional installation instructions which relate to motor cooling
duct connections, auxiliary cooling fan selection advice, anti-vibration spring mount and flexible connector selections.
4. OPERATING CONDITIONS
Under emergency conditions, these fans are suitable for the temperature/time capability stated on their name plate or in
accompanying documentation. e.g. "HT300/1" or "F300 (60)" denotes that a fan is suitable for a single use at an emergency
condition of 300°C for 1 hour (60 minutes). Our JMF Bifurcated fan range can operate up to 600°C for 2 hours provided that
the air temperature at entry to the motor compartment does not exceed 40°C. If the emergency air temperature exceed
400°C, a means of ducting hot air away from the motor compartment to a safe location must be provided. In addition, a means
must also be provided to force ventilate the motor compartment, in order to supply cooling air which is at less than 40°C.
Motor cooling fan and associated ductwork shall be provided by others.
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. 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 an additional label
adjacent to the main nameplate.
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5. CONNECTION
The wiring to the fan must be in accordance with the connection diagram in the terminal box.
Fans are designed for a 3 phase electrical supply. On commissioning, the rotation of the impeller should always be checked
to ensure that it is running in the correct direction.
6. CABLE
Suitable fire-resistant cable must be used between the main supply, starter controls and the fan. The mains supply must 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.
7. CONTROL
High Temperature rated fans can either be run Direct-on-Line during their emergency [high temperature] operation, or via
an approved inverter (VSD), which has been selected in accordance with our EN12101-3:2015 certification. Where required,
a voltage waveform filter should also be fitted between the VSD and the fan drive motor. If in doubt, please seek advice from
Woods Air Movement.
Our HT fans can be soft-started, and speed controlled when operating in a normal ventilation mode. Use of non-approved
drives is permitted as long as the drive is by-passed from the control circuit once the fan is running at full speed. Variable
Speed Drives (VSDs) must not be located in the same fire compartment as the extract fans. They should instead be located
within a suitable fire protected compartment, remote from the fan. VSDs must be connected to the fans using appropriate HT
cable for the application and where required with screened cables to minimise the impact of EMC affects. VSDs should also be
fitted with appropriately selected voltage waveform, RFI or Harmonic filters, depending on 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 - HT FANS
For normal operation and planned preventative maintenance please refer to sections 17 and 18.
AT 3 MONTHLY INTERVALS WHEN FANS ARE NOT NORMALLY RUN
If the fan is intended for emergency use only, the resistance of its windings
to earth should be measured (at 500v dc). If the resistance value is found
to be less than 10 MΩ (Megaohm), then the motor should be dried out and
re-checked. Run the motor for at least 15 minutes to prevent hardening
of the grease and to minimise bearing corrosion issues.
AT 6 MONTHLY INTERVALS
For 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.
Part No. 407212
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