Warranty; Safety Recommendations - Lennox WA Series Installation, Operating And Maintenance

WARRANTY

2 - WARRANTY
The warranty of the chillers is subject to the warranty definitions as agreed upon in the order.
It is expected that the design and installation of the unit utilises good working practices.
The warranty will be legally null and void if :
- Service and maintenance have not been executed in accordance with the regulations, repairs have not
been carried out by Lennox personnel or have been implemented without prior written permission by
Lennox.
- Modifications have been made to the equipment without prior written permission by Lennox.
- Settings and protections have been modified without prior written permission by Lennox.
- Non-original or other than the prescribed refrigerants or lubricants are used.
- The equipment has not been installed and/or connected in accordance with the installation instructions.
- The equipment is being used improperly, incorrectly, negligently or not in accordance with its nature
and/or purpose.
- A flow protection device is not fitted.
In these circumstances Lennox is indemnified from any product liability claims from third parties.
In the event of a warranty claim the machine serial number and Lennox order number must be quoted.
2.1 – SAFETY RECOMMENDATIONS
The safety information contained in this manual is provided as a guide for the safe handling of this
installation. Lennox does not vouch for the completeness of this information and can therefore not accept
liability for any possible omissions.
In the air cooled chillers, heat is being transported by a pressurised refrigerant, with changes in pressure and
temperature. Fans have been provided to discharge heat into the environment. The protection of operating and
maintenance personnel was central in the design of the air cooled chiller. Safety features have been included to
prevent excessive pressure in the system. Sheet metal parts have been fitted to prevent inadvertent contact with
(hot) pipes. The fans are equipped with protective grids and the electrical control panel is completely touch-proof.
This excludes some parts operating at a safe voltage (< 24 Volt). The service panels can only be opened using tools.
Notwithstanding that the air cooled chillers are equipped with extensive safety and protection features, the
utmost care and attention is needed when carrying out operations on the machine.
Make sure to get every safety precautions such as: individual protections (gloves, glasses, protective
clothes, safety shoes...), appropriates tooling, appropriate fire extinguishers for the system and the
refrigerant type within easy reach...
Make also sure that technicians are well trained to work on these units, and get necessary qualifications
(electrical, frigorific, local rules...). Any particular operation such as welding, soldering, or electrical works
must be done by properly qualified technicians.
It is essential to follow non exhaustive recommendations hereunder:
Never work on a unit that is still energized.
Any manipulation (opening or closing) of a shut-off valve must be carried out by a qualified and
authorised engineer. These procedures must be carried out with the unit shut-down.
Never work on any of the electrical components, until the general power supply to the unit has been cut.
During any maintenance operations on the unit, lock the power supply circuit in the open position ahead
of the machine. If the work is interrupted, check the lock before resuming the work.
WARNING: Even if the unit has been switched off, the power circuit remains energized, unless the unit or circuit
disconnect switch is open. Refer to the wiring diagram for further details.
For some units, a separate 220V power supply may exist, check the electrical wiring for more informations
In case of maintenance operations on fans (grills replacement ...) ensure that the power is shut off to
avoid automatic restart.
Before the opening of the refrigerant circuit, check the pressure with manometers or pressure sensors.
Never leave a unit stopped with valves closed on the liquid line, refrigerant could be trapped and the
pressure would rise.
Installation - Operation - Maintenance manual (IOM) • AIR COOLED CHILLERS & SPLIT UNITS - 1106-E
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