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5 Preparation
4.2.1
Identification label: Outdoor unit
Location
Model identification
Example: LR ME Q 4 A Y1 [*]
Code
LR
ZEAS condensing unit
ME
Medium temperature refrigeration
Q
Refrigerant R410A
3+4
Capacity class
A
Model series
Y1
Power supply
[*]
Minor model change indication
4.3
About the outdoor unit
This installation manual concerns the ZEAS condensing unit.
This unit is intended for outdoor installation and aimed for air to air
cooling applications.
Specification
Capacity (cooling)
Ambient design temperature (cooling)
4.4
System layout
a
b
c
a
Outdoor unit (ZEAS condensing unit)
b
Refrigerant piping
c
Indoor unit (Blower coil)
d
Indoor unit (Showcase)
4.5
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 mechanical thermostatic
expansion valve on each indoor unit. Insulate the feeler block of
the mechanical thermostatic expansion valve.
Installer and user reference guide
8
Explanation
LRMEQ3+4
5.90~8.40 kW
–10~43°C DB
d
▪ 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 mechanical thermostatic 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 mechanical
thermostatic 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.
▪ Multiple indoor units. When installing multiple indoor units,
install them at the same level. A combination of showcases and
blower coils is allowed if they are installed on the same floor.
▪ Defrosting type. Use either off-cycle defrosting or electric heater
defrosting models. Do NOT use hot-gas defrosting models.
4.5.1
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 [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 mechanical thermostatic expansion
valve is compatible with R410A.
5
Preparation
5.1
Overview: Preparation
This chapter describes what you have to do and know before going
on-site.
It contains information about:
▪ Preparing the installation site
▪ Preparing the refrigerant piping
▪ Preparing the electrical wiring
5.2
Preparing installation site
Do NOT install the unit in places often used as work place. In case
of construction works (e.g. grinding works) where a lot of dust is
created, the unit must be covered.
Choose the installation location with sufficient place for carrying the
unit in and out of the site.
LRMEQ3+4AY1
Air-cooled refrigeration condensing unit
4P442131-1 – 2016.03
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Troubleshooting
