Repair Safety Considerations - Carrier AquaSnap 61AF 022 Installation, Operation And Maintenance Instructions

1 - INTRODUCTION

1.5 - Repair safety considerations

All installation parts must be maintained by the personnel in
charge, in order to avoid deterioration and injury. Faults and leaks
must be repaired immediately. The authorized technician must
have the responsibility to repair the fault immediately. After each
repair of the unit, check the operation of the protection devices
and create a report of the parameter operation at 100%.
Comply with the regulations and recommendations in unit and
HVAC installation safety standards, such as: EN 378 and ISO
5149.
RISK OF EXPLOSION
Never use air or a gas containing oxygen during leak tests to
purge lines or to pressurise a machine. Pressurised air mixtures
or gases containing oxygen can be the cause of an explosion.
Oxygen reacts violently with oil and grease.
Only use dry nitrogen for leak tests, possibly with an appropriate
tracer gas.
If the recommendations above are not observed, this can have
serious or even fatal consequences and damage the installation.
Never exceed the specified maximum operating pressures.
Verify the allowable maximum high- and low-side test pressures
by checking the instructions in this manual and the pressures
given on the unit name plate.
Do not unweld or flamecut the refrigerant lines or any refrigerant
circuit component until all refrigerant (liquid and vapour)as well
as the oil have been been transferred from the heat pump. Traces
of vapour should be displaced with dry air nitrogen. Refrigerant
in contact with an open flame can produce toxic gases.
The necessary protection equipment must be available, and
appropriate fire extinguishers for the system and the refrigerant
type used must be within easy reach.
Do not siphon refrigerant.
Avoid spilling liquid refrigerant on skin or splashing it into the
eyes. Use safety goggles and safety gloves. Wash any spills
from the skin with soap and water. If liquid refrigerant enters the
eyes, immediately and abundantly flush the eyes with water and
consult a doctor.
The accidental releases of the refrigerant, due to small leaks or
significant discharges following the rupture of a pipe or an
unexpected release from a relief valve, can cause frostbites and
burns to personnel exposed. Do not ignore such injuries.
Installers, owners and especially service engineers for these
units must:
- Seek medical attention before treating such injuries.
- Have access to a first-aid kit, especially for treating eye
injuries.
We recommend to apply standard EN 378-3 Annex 3.
Never apply an open flame (blowlamp) or overheated steam
(high-pressure cleaner) to the refrigerant circuit. Dangerous
overpressure can result
During refrigerant removal and storage operations follow
applicable regulations. These regulations, permitting
conditioning and recovery of halogenated hydrocarbons
under optimum quality conditions for the products and
optimum safety conditions for people, property and the
environment are described in standard NF E29-795.
Refer to the certified dimensional drawings for the units.
It is dangerous and illegal to re-use disposable (non-
returnable) reclaim cylinders or attempt to refill them. When
reclaim cylinders are empty, evacuate the remaining gas
pressure, and move them to a designated place for recovery.
Do not incinerate.
Do not attempt to remove refrigerant circuit components or
fittings, while the machine is under pressure or while it is
running. Be sure pressure is at 0 kPa and that the unit has
been shut-down and de-energised before removing
components or opening a circuit.
Do not attempt to repair or recondition any safety devices
when corrosion or build-up of foreign material (rust, dirt,
scale, etc.) is found within the valve body or mechanism. If
necessary, replace the device. Do not install relief valve in
series or backwards.
ATTENTION: No part of the unit must be used as a walkway,
rack or support. Periodically check and repair or if necessary
replace any component or piping that shows signs of damage.
Do not step on refrigerant lines. The lines can break under
the weight and release refrigerant, causing personal injury.
Do not climb on a machine. Use a platform, or staging to work
at higher levels.
Use mechanical lifting equipment (crane, hoist, winch, etc.)
to lift or move heavy components. For lighter components,
use lifting equipment when there is a risk of slipping or losing
your balance.
Use only original replacement parts for any repair or
component replacement. Consult the list of replacement parts
for the specification of the original equipment.
Do not drain water circuits containing industrial brines,
without informing the technical service department at the
installation site or a competent body first.
Close the entering and leaving water shut-off valves and purge
the unit hydraulic circuit, before working on the components
installed on the circuit (screen filter, pump, water flow switch,
etc.).
Periodically inspect all valves, fittings and pipes of the
refrigerant and hydraulic circuits to ensure that they do not
show any corrosion or any signs of leaks.
It is recommended to wear ear defenders, when working near
the unit and the unit is in operation.
Always ensure you are using the correct refrigerant type
before recharging the unit.
Charging any refrigerant other than the original charge type
(R-407C) will impair machine operation and can even lead to
a destruction of the compressors. The compressors operate
with R-407C and are charged with a synthetic polyol-ester oil.
Before any intervention on the refrigerant circuit, the complete
refrigerant charge must be recovered.