Daikin LREQ-BY1R, Installation Manual

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20B7Y1R
Air cooled refrigeration condensing unit
4P360438-1B – 2014.01
Installation manual
18
CAUTION
• Conduct an airtight test and vacuum drying precisely through the
service ports of both liquid and gas shutoff valves.
• Use charge hoses (provided with a pushing rod each) when using
the service ports.
8-2 Thermal insulation work
• Be sure to perform thermal insulation of the piping after the airtight
test and vacuum drying.
• Be sure to perform the thermal insulation of the liquid and gas
pipes in the connecting piping. Otherwise, water leakage may
result.
• Be sure to insulate liquid and gas connection piping. Failure to do
so may result in water leakage. Consult the following chart as a
general guide when selecting the insulation thickness.
• Liquid pipe arrival minimum temperature 0°C
Gas pipe arrival minimum temperature –45°C
• Reinforce the insulation material for the refrigerant piping
according to the environment of thermal installation. Otherwise, the
surface of the insulation material may result in dew condensation.
• If the dew condensation water on the shutoff valves is likely to flow
to the indoor unit side through the clearance between the insulation
material and piping because the outdoor unit is installed above the
indoor unit or for some other reasons, perform appropriate
treatment such as the caulking of the joints (see the illustrations
below).
• Attach the cover of the piping outlet with a knock hole opened. If
there is a feature of small animals intruding through the piping
outlet, cover the piping outlet with a blocking material (field supply)
on completion of the steps of
"10. REFRIGERANT
REPLENISHMENT" on page 19 (see the illustrations below).
Use the piping outlet for jobs required during the steps of
"10. REFRIGERANT REPLENISHMENT" on page 19 (e.g., a job
of taking in the charge hose).
Note
• After knocking out the holes, we recommend you remove burrs in
the knock holes and paint the edges and areas around the edges
using the repair paint.
• Make sure there is no gap in the Y–joint.
8-3 Checking of device and installation conditions
Be sure to check the followings.
For those doing electrical work
See "7-2 Procedure for incoming wiring" on page 14 .
1.
Make sure there is no faulty power wiring or loosing of a nut.
See
"7-3 Procedure for power supply wiring" on page 14 .
2.
Has the insulation of the main power circuit deteriorated?
Measure the insulation and check the insulation is above regular
value in accordance with relevant local and national regulations.
For those doing pipe work
1.
Make sure piping size is correct.
See
"6-1 Selection of piping material" on page 7 .
2.
Make sure insulation work is done.
See
"8-2 Thermal insulation work" on page 18 .
3.
Make sure there is no faulty refrigerant piping.
See
"6. REFRIGERANT PIPING" on page 6 .
9. CHECKS AFTER WORK COMPLETION
• Make sure the following works are complete in accordance with the
installation manual.

Piping work

Wiring work

Air tight test/vacuum drying

Installation work for indoor unit
Pressure-reducing valve
Nitrogen
Used for refrigerant
replenishment
Tank
(with siphon)
Meter
Vacuum pump
Valve
Charge
hose
Gas side shutoff valve
Shutoff valve
service port
Liquid side
shutoff valve
Field pipings Note:
Connection procedure for gauge
manifold and vacuum pump
R410A
Outdoor unit
To indoor
unit
Liquid side
shutoff valve
Gas side
shutoff valve
Indoor/Outdoor
interunit piping
Insulation material
Coking, etc.
Piping lead-out
hole lid
Gas side piping
Liquid side piping
Open a knock
hole at
Block