Riello NXHP Series Installation, Operation And Maintenance Instructions page 12

1 - INTRODUCTION
Before opening a refrigerant circuit, transfer
the refrigerant to bottles specifically provided
for this purpose and consult the pressure
gauges.
Change the refrigerant after an equipment
failure, following the procedure below. or
carry out a refrigerant analysis in a specific
laboratory.
If the refrigerant circuit remains open after an
i n t e r v e n t i o n ( s u c h a s a c o m p o n e n t
replacement, etc.):
■ Seal the openings if the duration is less than
a day
■ If more than 1 day, charge the circuit with
oxygen free nitrogen (inertia principle).
The objective is to prevent penetration of
atmospheric humidity and the resulting
corrosion.
1.2.4 - Repair safety considerations
All installation parts must be maintained by the
personnel in charge 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 unit repair check the
operation of the protection devices and create a
100% parameter operation report.
Comply with the regulations and recommendations
in unit and HVAC installation safety standards.
If the supply cord is damaged, it must be
replaced by the manufacturer, its service
agent or similarly qualified persons in order
to avoid a hazard.
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.
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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 removed from the heat pump.
Traces of vapour should be displaced with
dry nitrogen. Refrigerant in contact with an
open flame can produce toxic gases or an
explosion.
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.
Do not store any flammable material at less
than one meter of the unit.
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.