Specifications

Installation Manual EDUS04-740
52 Room Air Conditioners D-Series
In order to protect the environment, be sure to pump down
when relocating or disposing of the unit.
1) Remove the valve lid 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.
How to force cooling operation mode
Using the indoor unit operation/stop button
Press the indoor unit operation/stop button for at least five seconds. (Operation will start.)
•


Forced cooling operation will stop automatically after around 15 minutes.
To force a test run to stop, press the indoor unit operation/stop button.
Using the main unit’s remote control
1) Press the “operation/stop” button. (Operation will start.)
2) Press the temperature button and the “operation select” button at the same time.
3) Press the “operation select” button twice. ( will be displayed and the unit will enter test run mode.)
4) Press the “operation select” button to return the operation mode to cooling.
• Test run mode will stop automatically after around 30 minutes. To force a test run to stop, press the operation/stop button.
Gas shut-off
valve
Valve lid
Hexagonal
wrench
Close
Liquid shut-off valve
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” mm 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 kW/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.
3) 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
Gas side
Liquid side
Gas pipe thermal insulation
Liquid pipe
thermal insulation
O.D. 3/8”
Thickness 1/32”
I.D. 1/2”-2/3” I.D. 1/3”-1/2”
Thickness 1/3” minimum
09/12 class 09/12 class
O.D. 1/4”
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.)
After closing the liquid shut-off valve, close the gas shut-off valve within three minutes, then stop the forced operation.
Caution
Pump Down Operation