Pump Down Operation - Daikin H-Series Engineeiring Data

Installation Manual
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.)
• Be sure to use the R410A tools to ensure pressure and to prevent foreign objects entering.
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.
Selection of Copper and Heat Insulation materials
7-2
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)
Choose heat insulation materials that are designed for HVAC use.
2) Be sure to insulate both the gas and liquid piping and to provide insulation dimensions as below.
Gas side
09/12 class
O.D. 3/8 inch
Thickness 0.031 inch (C1220T-O)
3)
Use separate thermal insulation pipes for gas and liquid refrigerant pipes.
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.
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
3) Press the "operation select" button twice. (
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.
CAUTION
After closing the liquid stop valve, close the gas stop valve within 3 minutes, then stop the forced operation.
50
Outdoor Unit Installation (3)
Gas pipe thermal insulation
Liquid side
O.D. 1/4 inch I.D. 0.472-0.590 inch
Minimum bend radius
1-3/16 inch or more

Pump Down Operation

button and the "operation select" button at the same time.
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.
Rain
Liquid pipe
thermal insulation
09/12 class
I.D. 0.315-0.393 inch
Thickness 0.393 inch Min.
will be displayed and the unit will enter test run mode.)
EDUS04-904
Filling other cylinders
Turn the cylinder
upside-down when
filling.
Wall
Be sure to
place a cap.
If no flare cap is
available, cover the
flare mouth with
tape to keep dirt or
water out.
Inter-unit wiring
Gas pipe
Liquid pipe
Gas pipe
Liquid pipe
insulation
insulation
Finishing tape Drain hose
Hexagonal
wrench
Liquid stop valve
Close
Gas stop
valve
Valve cap
Room Air Conditioners H-Series