Daikin LRMEQ3BY1, Installation And Operation Manual

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4 Preparation
Installation and operation manual
7
4BY1
Air-cooled refrigeration condensing unit
4P495373-1 – 2017.07
b Refrigerant piping
c Indoor unit (Blower coil)
d Indoor unit (Showcase)
3.3 About the indoor units
NOTICE
To be sure your system setup (outdoor unit+indoor unit(s))
will work, you have to consult the latest technical
engineering data for ZEAS condensing unit.
The ZEAS condensing unit can be combined with several types of
third party indoor units and is intended for R410A use only.
When installing indoor units, mind the following:
▪ Expansion valve . Install an R410A expansion valve on each
indoor unit. Insulate the feeler block of the expansion valve.
INFORMATION
▪ Install either a mechanical thermostatic expansion
valve, or an electronic expansion valve (proportional or
pulse type).
▪ When installing a pulse-type electronic expansion
valve, make sure to protect the piping from pressure
waves caused by the opening and closing of the valve.
The installation of a pulse type expansion valve is the
responsibility of the installer.
For more information, see "4.2.6 To select the expansion valve" on
page 8 .
▪ Solenoid valve . Install an R410A solenoid valve (with an
operating differential pressure of 3.5 MPa [35 bar] or more) on the
primary side of the expansion valve for each indoor unit.
▪ Filter . Install a filter on the primary side of the solenoid valve for
each indoor unit. Determine the filter mesh count based on the
size specified by the solenoid valve and the expansion valve being
used.
▪ Refrigerant flow . Route the path to the indoor unit heat
exchanger so that the refrigerant flow is from top to bottom.
▪ Defrosting type . Use either off-cycle defrosting or electric heater
defrosting models. Do NOT use hot-gas defrosting models.
3.3.1 About reusing existing indoor heat
exchangers
In some cases you may reuse existing indoor heat exchangers, in
other cases not.
Reuse NOT allowed
You may not reuse existing indoor heat exchangers in the following
cases:
▪ When the design pressure is insufficient. Minimum design
pressure = 2.5 MPa or 25 bar
▪ When the path to the heat exchanger has been routed so that the
flow of refrigerant is from bottom to top.
▪ When the copper piping or fan is corroded.
▪ When the heat exchanger is contaminated. Foreign materials
(including oils for fabrication) must be ≤30 mg/10 m.
Reuse allowed
In other cases than above, you may reuse existing indoor heat
exchangers. However, if the old condensing unit did NOT use the
same refrigerant (R410A) and the same oil (FVC68D) as the new
one, you must clean the heat exchanger tubes to remove any
residue.
If the old condensing unit did NOT use the same refrigerant (R410A)
as the new one, make sure the expansion valve is compatible with
R410A.
4 Preparation
4.1 Preparing the installation site
4.1.1 Installation site requirements of the
outdoor unit
Mind the spacing guidelines. See the "Technical data" chapter, and
the figures on the inside of the front cover.
CAUTION
Appliance not accessible to the general public, install it in a
secured area, protected from easy access.
This unit, both indoor and outdoor, is suitable for
installation
in a commercial and light industrial
environment.
NOTICE
This equipment is compliant with Class A of EN55032/
CISPR 32. In a residential environment this equipment
may cause radio interference.
INFORMATION
The sound pressure level is less than 70 dBA.
4.2 Preparing refrigerant piping
4.2.1 About reusing existing piping
In some cases you may reuse existing piping, in other cases not.
Reuse not allowed
You may not reuse existing piping in the following cases:
▪ When the compressor in the old installation had problems
(example: breakdown). Possible consequence: oxidised coolant
oil, scale residue and other adverse effects.
▪ When the indoor and outdoor units were disconnected from the
piping for a long time. Possible consequence: water and dirt in
the piping.
▪ When the copper piping is corroded.
Reuse allowed
In other cases than above, you may reuse existing piping but keep
the following in mind:
Item Description
Piping diameter Must comply with requirements. See
"4.2.2 Refrigerant piping requirements" on
page 8
.
Piping material
Piping length and
height difference
Piping insulation If deteriorated, must be replaced.
Must comply with requirements. See To
insulate the refrigerant piping.
Welded connections Must be checked for gas leaks.
Cleaning piping If the old condensing unit did NOT use the
same refrigerant (R410A) and the same oil
(FVC68D) as the new one, you must clean
the piping to remove any residue.