Pump Down Operation - Daikin R410A Split Series Installation Manual

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 0.052W/mK (0.035 to 0.045kcal/mh°C)
Refrigerant gas pipe's surface temperature reaches 110°C 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.
Gas side
O.D. 9.5mm
Minimum bend radius
Thickness 0.8mm (C1220T-O)
3) Use separate thermal insulation for gas and liquid refrigerant pipes.
•

Pump Down Operation

CAUTION
• When pressing the switch, do not touch the terminal block. It has a high voltage, so doing so
may cause electric shock.
• After closing the liquid stop valve, close the gas stop valve within 3 minutes, then stop the
pump down operation.
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 pump down 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 pump down operation.
Pump down operation
 Using the outdoor unit pump down operation switch
Push on " " (SW1) with a screwdriver. (The operation will start.)
• Pump down operation will stop automatically after around 15 minutes.
To stop the operation, press the switch (SW1).
English
Liquid side
O.D. 6.4mm
30mm or more
Gas pipe Liquid pipe
thermal insulation thermal insulation
I.D. 12-15mm I.D. 8-10mm
Thickness 10mm Min.
Be sure to
place a cap.
Rain
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt
or water out.
Inter-unit wire
Gas pipe
Gas pipe
insulation
Finishing tape
Liquid
stop valve
Gas
stop valve
Service port
Push
Wall
Liquid pipe
Liquid pipe
insulation
Hexagonal
wrench
Close
Valve cap
Power supply
terminal block
Screwdriver
9