Lay-Out And Installation Requirements - Lennox WA Series Installation, Operating And Maintenance

3.3 - LAY-OUT AND INSTALLATION REQUIREMENTS

The following preparations are important for the installation of the chiller :
- Air-cooled chillers with helicoids fans such as Ecologic are designed for outdoor installation. Please consult Lennox
prior to implementing other types of installation.
- Locate the chiller where it is least affected by wind (install windbreaks where wind speeds > 2.2 m/s).
- The ground beneath the unit must be flat, level and of sufficient strength to support the weight of the unit with its full
liquid charge, and the occasional presence of the usual service equipment.
In locations exposed to frost, the supporting surface, if the unit is installed on the ground, must be built on concrete
stakes extending downwards beyond the normal depth of frost. It is always advisable to build a supporting surface
detached from the general building structure to avoid transmission of vibrations.
- On normal applications, unit rigidity and point load positions enable installation to minimise vibrations. Vibration
isolators may be used by contractors on installations requiring particularly low vibration levels.
- Use of vibration isolators MUST be accompanied by installation of flexible connections in the unit water
piping. Vibration isolators must also be fixed to the unit BEFORE being fixed to the ground.
Selection of vibration absorbing isolator capacity is not LENNOX's responsibility.
The unit must be bolted to the vibration isolators and the latter solidly fixed into the concrete slab.
Check that vibration isolator contact surfaces fit flush to the floor. If necessary, use spacers or re-surface the
flooring, but in all events, make sure that the isolators seat flatly on the supporting surface.
- It is essential that the units be installed with sufficient free space around them to enable proper circulation of air
ejected by the condensers and to provide easy access to all unit components for servicing and maintenance. If the
air rejected by the condenser encounters any obstacles, it will tend to be recycled by the fans. This will cause an
increase in the temperature of the air used to cool the condensers. Obstruction of the air outlet will also impair air
distribution across the entire heat exchanging surface of the condenser. Both of these conditions, which reduce the
heat exchange capacity of the coils, will cause an increase in condensing pressure. This will lead to a loss of
capacity and an increase in compressor power input.
- To prevent air flow to be reversed due to prevaling winds, units cannot be completely shrouded with a higher,
uninterrupted wind shield. If such a configuration cannot be avoided, an air ejection duct must be installed at the
same height as the surrounding shield.
It is important that units must be leveled failure to install unit correctly will void warranty.
Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 1106-E
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