Daikin LREQ5B7Y1 Installation Manual Download

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Installation manual

LREQ5~20B7Y1

Air cooled refrigeration condensing unit

4PW74302-1 – 2012.06

After installation, remove the transportation clasp (yellow) attached
to the large openings.

Note

Apply a filler cloth on a fork to prevent coating of the bottom frame from
coming off and rust from occurring when bringing in the unit with anti-
corrosion treatment type using a forklift.

5. PLACING THE UNIT

• Make sure the unit is installed level on a sufficiently strong base to

prevent vibration and noise.

• The base should be bigger around than the width of the unit’s legs

(66 mm), and should support the unit.
If protective rubber is to be attached, attach it to the whole face of
the base.

• The height of the base should be at least 150 mm from the floor.
• Secure the unit to its base using foundation bolts. (Use four

commercially available M12-type foundation bolts, nuts, and
washers.)

• The foundation bolts should be inserted 20 mm.

Note

• When installing on a roof, make sure the roof floor is strong enough

and be sure to water-proof all work.

• Make sure the area around the machine drains properly by setting

up drainage grooves around the foundation.
Drain water is sometimes discharged from the outdoor unit when it
is running.

• If the condensing unit is of brine

damage resistant or heavy brine
damage resistant type, use nuts
provided with resin washers to secure
the product to the foundation bolts (see
the illustration on the right-hand side).
The rustproof effect of the nut will be lost if the coatings on the
tightening portions of the nuts come off.

6. REFRIGERANT PIPING

To Piping Work Contractors

• Never open the shutoff valve until the steps specified in

"7. FIELD

WIRING" on page 10

and

"8-3 Checking of device and installation

conditions" on page 15

of piping.

• Do not use flux at the time of brazing and connecting refrigerant

pipes. Use phosphorous copper brazing filler metal (BCuP-2),
which does not require flux. Chlorine-based flux causes piping
corrosion. Furthermore, if fluoride is contained, the flux will have
adverse influences on the refrigerant piping line, such as the
deterioration of refrigerating machine oil.

CAUTION

• All field piping must be installed by a licensed refrigeration

technician and must comply with relevant local and national
regulations.

[Precautions for reuse of existing refrigerant piping/heat
exchangers]

Keep the following points in mind for the reuse of existing
refrigerant piping / heat exchangers.
A malfunction may result if there is deficiency.

• Do not use the existing piping in the following cases. Perform new

piping instead.

• The piping is different in size.
• The strength of the piping is insufficient.
• The compressor of the condensing unit previously used caused a

malfunction.
An adverse influence of residual substances, such as the oxidation
of refrigerant oil and the generation of scale, is considered.

• If the indoor unit or outdoor unit is disconnected from the piping for

a long time.
The intrusion of water and dust into the piping is considered.

• The copper pipe is corroded.
• The refrigerant of the condensing unit previously used was other

than R410A (e.g., R404A / R507 or R407C).
The contamination of the refrigerant with heterogeneity is
considered.

• If there are welded connections midway on the local piping, make

gas leakage checks on the welded connections.

• Be sure to insulate the connection piping.

The liquid and gas pipe temperatures are as follows:
Liquid pipe arrival minimum temperature: 0°C
Gas pipe arrival minimum temperature: –45°C
In the case of thickness insufficiency, add additional insulation
material or renew the existing insulation material.

• Renew the insulation material if the insulation material is degraded.

Keep the following points in mind for the reuse of existing heat
exchangers

• Units with insufficient design pressure (since this product is an

R410A unit) require a lower-stage design pressure of 2.5 MPa
[25 bars].

• Units for which the path to the heat exchanger has been routed so

that the flow of refrigerant is from bottom to top

• Units with copper tubing or fan corrosion
• Units that may be contaminated with foreign matter such as

rubbish or other dirt

Corner-hole
foundation

Independent
foundation

Beam
foundation
(horizontal)

Beam
foundation
(vertical)