5
1 - INTRODUCTION
The 61XWH units are designed to cool and heat water (or brine)
for the air conditioning and heating of buildings and industrial
processes.
Prior to the initial start-up of the 61XWH units, the people involved
in the on-site installation, start-up, operation, and maintenance of
this unit must be thoroughly familiar with these instructions and the
specific project data for the installation site (Machine room, etc).
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.
Always ensure that all required safety measures are followed,
including those in this document, such as: wearing protective
clothing (gloves, safety glasses and shoes) using appropriate tools,
employing qualified and skilled technicians (electricians, refrigeration
engineers) fully trained in the use of flammable refrigerants and
following local regulations (see annexe E in EN 378 -4 - Guidelines
for repairs of equipment using flammable refrigerants).
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.
According to ISO-817, R1234ze(E) is classified in safety group
A2L: lower flammability. One of the characteristic of this
refrigerant is the absence of flammable mixture with air under
21°C of ambiance and controlled humidity conditions.
However when humidity or temperature goes up, this
refrigerant can become flammable and can represent a
potential danger if flammability risks are not properly
mitigated within the machine room installation.
Local building codes and safety standards shall be followed.
In absence of local codes and standards, please refer to EN-378
(2012) (Safety requirements for substances classified A2) or to
ISO-5149 (2014) (for substances classified A2L) as a guide.
Customer shall obtain approval from the local building
authorities.
Carrier also provides additional guidelines for the safe use
of R1234ze(E) refrigerant that should be added to the
requirements of safety standards and building codes to insure
that the risks are minimised to acceptable levels.
Refer to paragraph 2 “additional guidelines for safe use of
R1234ze(E) refrigerant in machinery rooms”
For further details on physical properties, flammability &
toxicity characteristics, hazards Identification, installation
safety requirements, etc, refer to standards such as:
• ASHRAE 34, EN 378, ISO-817 and ISO-5149
•
Safety Data Sheet (SDS) supplied by the refrigerant
manufacturer
•
European union’s REACH database (Registration,
Evaluation, Authorisation and Restriction of Chemicals)
1.1 - Installation safety considerations
The 61XWH heat pumps are classified as “indirect heat exchange
system” and are designated to be installed in a special machinery
room (Class C as per ISO-5149 and EN-378) where
only
authorized personnel
have access, who are acquainted with
general and special safety precautions of the establishment and
are qualified and trained in monitoring and maintenance. The
access limitation device must be installed by the customer (e.g.
cut-off, enclosure).
The refrigerant R1234ze(E) falls into refrigerant safety group A2L
in accordance to ISO-5149 and A2 in accordance to EN-378. No
Charge limitations apply for the level of occupancy is ‘C’. Please
refer to these standards for further details. This level needs to be
confirmed by the customer.
Refer also to paragraph 2 for “Additional guidelines for safe use
of R1234ze(E) refrigerant in machinery rooms”
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 fill a
claim with the shipping company.
Carrier strongly recommends employing a specialised company
to unload the machine.
It is compulsory to wear personal protection equipment.
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.
Use slings or lifting beams with the correct capacity, and always
follow the lifting instructions on the certified drawings supplied with
the unit. Do not tilt the unit more than 15°.
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.
Never cover any protection devices.
This applies to the relief valves in the refrigerant or heat transfer
medium circuits, and the pressure switches.
Ensure that the valves are correctly installed, before operating the
unit.
DO NOT OBSTRUCT ANY PROTECTIVE DEVICES:
This applies to any fusible plugs, rupture disks and valves fitted
on the refrigerant or heat transfer fluid circuits. Check whether 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. Fit devices at the valve or
discharge piping outlets to 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 discharge
piping, must not impair operation or lead to a pressure drop that
is higher than 10% of the set pressure.
CLASSIFICATION AND CONTROL:
In accordance with the Pressure Equipment Directive and national
usage monitoring regulations in the European Union, the protective
devices fitted to these machines are classified as follows:
Safety
device
(1)
Device for damage
limitation in the event of an
external fire
(2)
Refrigerant Side
High pressure safety loop
(3)
X
External relief valve
(4)
X
Rupture disk
X
Heat transfer fuid side
External relief valve
(5)
(5)
(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) High pressure safety loop = SRMCR as described in component section of this
manual and in electrical diagram.
(4) The instantaneous overpressure 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.
(5) The selection of these relief valves must be made by the personnel responsible
for completing the hydraulic installation.
