Specifications

EDUS04-740 Installation Manual
Room Air Conditioners D-Series 59
Outdoor Unit Installation
In order to protect the environment, be sure to pump down when relocating or disposing of the unit.
1)
Remove the valve lids from liquid shut-off valve and gas shut-off valve.
2) Carry out forced cooling operation.
3) After five to ten minutes, close the liquid shut-off valve with a
hexagonal wrench.
4) After two to three minutes, close the gas shut-off valve and
stop forced cooling operation.
Forced cooling operation
1) Press the Forced Operation switch (SW1) to begin forced cooling. Press the Forced Operation switch (SW1) again
to stop forced cooling.
Gas shut-off valve
Valve lid
Hexagonal wrench
Close
Liquid shut-off valve
Service port
ABC
ON
SW4
LED
- A
S52
Forced operation switch
SW1
S2
1A
123
Pump Down Operation
7. Refrigerant Piping Work
7-1 Cautions on Pipe Handling
1)
Protect the open end of the pipe against dust and moisture.
2)
All pipe bends should be as gentle as possible. Use a pipe bender for bending.
(Bending radius should be 1 1/4” to 1 5/8” or larger.)
7-2
Selection of Copper and Heat Insulation materials
When using commercial copper pipes and fittings, observe the following:
1) Insulation material: Polyethylene foam
Heat transfer rate: 0.041 to 0.052 W/mK (0.024-0.030 Btu/fth°F)
Refrigerant gas pipe’s surface temperature reaches 230°F max.
Choose heat insulation materials that will withstand this temperature.
2)
Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
• Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
• Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
Wall
If no flare cap is
available, cover
the flare mouth
with tape to keep
dirt or water out.
Be sure to
place a cap.
Rain
Gas pipe
Liquid pipe
Gas pipe
insulation
Liquid pipe
insulation
Finishing tape
Drain hose
Inter-unit wiring
Filling a cylinder with an attached siphon
Stand the cylinder upright when filling.
There is a siphon pipe inside, so the cylinder
need not be upside-down to fill with liquid.
Filling other cylinders
Turn the cylinder upside-down
when filling.
6. Refilling The Refrigerant
Check the type of refrigerant to be used on the machine nameplate.
Precautions when adding R410A
Fill from the liquid pipe in liquid form.
It is a mixture of refrigerant, so adding it in gas form may cause the refrigerant composition to change, preventing normal operation.
1) Before filling, check whether the cylinder has a siphon attached or not. (It should have something like “liquid filling siphon attached” displayed on it.)
Liquid pipe
thermal insulation
Gas pipe thermal insulationLiquid sideGas side
15/18 class 15/18/24 class24 class 15/18 class 15/18/24 class24 class
O.D. 1/2” O.D. 1/4” O.D. 5/8”
I.D. 1/2-5/8” I.D. 1/3-1/2” I.D. 5/8”-2/3”
Thickness 1/32” Thickness 1/32” Thickness 1/20”
Thickness 1/3” minimum