Installation manual

Outdoor Unit Installation (3)
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.
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.
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.
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.
After closing the liquid stop valve, close the gas stop valve within 3 minutes, then stop the forced operation.
CAUTION
Pump Down 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.)
How to force cooling operation mode
Using the indoor unit operation/stop button
Press the indoor unit operation/stop button for at least 5 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 side
Liquid side
Gas pipe thermal insulation
Liquid pipe
thermal insulation
O.D. 3/8 inch
Minimum bend radius
1-3/16 inch or more
Thickness 0.031 inch (C1220T-O)
I.D. 0.472-0.590 inch I.D. 0.315-0.393 inch
Thickness 0.393 inch Min.
09/12 class 09/12 class
O.D. 1/4 inch
In order to protect the environment, be sure to pump down
when relocating or disposing of the unit.
1) Remove the valve cap from liquid stop valve and gas stop valve.
2) Carry out forced cooling operation.
3) After 5 to 10 minutes, close the liquid stop valve with a hexagonal wrench.
4) After 2 to 3 minutes, close the gas stop valve and stop forced cooling operation.
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.
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 stop
valve
Valve cap
Hexagonal
wrench
Close
Liquid stop valve