Introduction; Installation Safety Considerations - Carrier AquaSnap 61WG Series Installation, Operation And Maintenance Instructions

1 - INTRODUCTION

Prior to the initial start-up of the units, the people involved in the
on-site installation, start-up, operation and maintenance of this
unit should be thoroughly familiar with these instructions and the
specific project data for the installation site.
The units are designed to provide a very high level of safety during
installation, start-up, operation and maintenance. They will provide
safe and reliable service when operated within their application
range.
They are designed for an operating life of 15 years by assuming
a 75% utilisation factor; that is approximately 100,000 operating
hours.
This manual provides the necessary information to familiarize
yourself with the control system before performing start-up
procedures. The procedures in this manual are arranged in the
sequence required for machine installation, start-up, operation
and maintenance.
Be sure you understand and follow the procedures and safety
precautions contained in the instructions supplied with the
machine, as well as those listed in this guide.
To find out, if these products comply with European directives
(machine safety, low voltage, electromagnetic compatibility,
equipment under pressure etc.) check the declarations of
conformity for these products.

1.1 - Installation safety considerations

After the unit has been received, when it is ready to be installed
or reinstalled, and before it is started up, it must be inspected for
damage. Check that the refrigerant circuit(s) is (are) intact,
especially that no components or pipes have shifted (e.g. following
a shock). If in doubt, carry out a leak tightness check and verify
with the manufacturer that the circuit integrity has not been
impaired. If damage is detected upon receipt, immediately file a
claim with the shipping company.
Do not remove the skid or the packaging until the unit is in
its final position. These units can be moved with a fork lift
truck, as long as the forks are positioned in the right place
and direction on the unit.
The units can also be lifted with slings, using only the
designated lifting points marked on the unit.
These units are not designed to be lifted from above. Use
slings with the correct capacity, and always follow the lifting
instructions on the certified drawings supplied with the unit.
Safety is only guaranteed, if these instructions are carefully
followed. If this is not the case, there is a risk of material
deterioration and injuries to personnel.
DO NOT COVER ANY PROTECTION DEVICES.
For unit installation and connection to the remote condenser
it is necessary to:
- Check the applicable air conditioning regulations and
safety standards (e.g. PED and EN378 for the European
Union)
- Determine which accessories (relief valves, fuses etc.)
are required so that these circuits comply with the
applicable regulations and standards.
If shut-off valves are used on the circuit, ensure that these
valves do not shut off the relief valve for the different
containers that they protect.
The protection devices include the fuse plugs and relief valve
(if used) in the refrigerant or heat transfer medium circuits.
Check if the original protection plugs are still present at the
valve outlets. These plugs are generally made of plastic and
should not be used. If they are still present, please remove
them. Install devices at the valve outlets or drain piping that
prevent the penetration of foreign bodies (dust, building
debris, etc.) and atmospheric agents (water can form rust or
ice). These devices, as well as the drain piping, must not
impair operation and not lead to a pressure drop that is higher
than 10% of the control pressure.
Classification and control
In accordance with the Pressure Equipment Directive and
national usage monitoring regulations in the European Union
the protection devices for these machines are classified as
follows:
Safety
accessories
Refrigerant side
High pressure switch
External relief valve (3)
Rupture disk
Fuse plug
Heat transfert lfuid side
External relief valve
(1) Classified for protection in normal service situations.
(2) Classified for protection in abnormal service situations. These accessories are
sized for fires with a thermal flow of 10kW/m². No combustible matter should be
placed within 6.5m of the unit.
(3) The instantaneous over-pressure limitation of 10% of the operating pressure
does not apply to this abnormal service situation.
The control pressure can be higher than the service pressure. In this case either
the design temperature or the high-pressure switch ensures that the service
pressure is not exceeded in normal service situations.
(4) The selection of these discharge valves must be made by the personnel
responsible for completing the hydraulic installation.
Do not remove these valves and fuses, even if the fire risk is
under control for a particular installation. There is no
guarantee that the accessories are re-installed if the
installation is changed or for transport with a gas charge.
All factory-installed relief valves are lead-sealed to prevent
any calibration change. If the relief valves are installed on a
Change over manifold (change-over), this is equipped with a
relief valve on each of the two outlets. Only one of the two
relief valves is in operation, the other one is isolated. Never
leave the reversing valve in the intermediate position, i.e. with
both ways open (locate the control element in the stop
position).
If a safety stop is removed for checking or replacement please
ensure that there is always an active safety stop on each of
the reversing valves installed in the unit.
The external relief valves must always be connected to drain
pipes for units installed in a closed room. Refer to the
installation regulations, for example those of European
standard EN 378 and EN 13136.
These pipes must be installed in a way that ensures that
people and property are not exposed to refrigerant leaks. As
the fluids can be diffused in the air, ensure that the outlet is
far away from any building air intake, or that they are
discharged in a quantity that is appropriate for a suitably
absorbing environment.
Periodic check of the relief valves: See paragraph 1.3 -
"Maintenance safety considerations".
Provide a drain in the drain pipe, close to each relief valve,
to avoid an accumulation of condensate or rain water.
All precautions concerning handling of refrigerant must be
observed in accordance with local regulations.
Ensure good ventilation, as accumulation of refrigerant in an
enclosed space can displace oxygen and cause asphyxiation
or explosions.
Inhalation of high concentrations of vapour is harmful and
may cause heart irregularities, unconsciousness, or death.
Vapour is heavier than air and reduces the amount of oxygen
available for breathing. These products cause eye and skin
irritation. Decomposition products are hazardous.
For WG/WGA size from 110 to 140, please follow instruction
on screen and stickers. You must unscrew 4 fixing red plates
keeping compressor from moving during transport. These
red plates are placed in the extremity of the C shaped
compressor support.
Over pressure protection
(1) in case of an external fire
x
x
x
x
(4) (4)
(2)
5