Preparation; Overview: Preparation; Preparing The Installation Site; Installation Site Requirements Of The Outdoor Unit - Daikin LRMEQ4BY1 Installer And User Manual

▪ 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 "5.3.7 To select the expansion valve" on
page 13.
▪ 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.
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.
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
LRMEQ+LRLEQ3+4BY1
Air-cooled refrigeration condensing unit
4P500362-1A – 2018.09
5.2 Preparing the 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 an installation location with sufficient space for carrying the
unit in and out of the site.
5.2.1 Installation site requirements of the
outdoor unit
INFORMATION
Also read the following requirements:
▪ General installation
"General safety precautions" chapter.
▪ Service space requirements. See the "Technical data"
chapter.
▪ Refrigerant piping
difference). See further in this "Preparation" chapter.
INFORMATION
The sound pressure level is less than 70 dBA.
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
environment.
NOTICE
This equipment is compliant with Class A of EN55032/
CISPR 32. In a residential environment this equipment
may cause radio interference.
NOTICE
The equipment described in this manual may cause
electronic noise generated from radio-frequency energy.
The equipment complies to specifications that are
designed to provide reasonable protection against such
interference. However, there is no guarantee that
interference will not occur in a particular installation.
It is therefore recommended to install the equipment and
electric wires keeping proper distances away from stereo
equipment, personal computers, etc.
a b c d a b e
a Earth leakage protector
b Fuse
c Indoor unit (Showcase)
d Personal computer or radio
e Indoor unit (Blower coil)
f User interface
g Outdoor unit
5 Preparation
site requirements. See the
requirements (length, height
and light industrial
f a b g
(mm)
Installer and user reference guide
9