English
7
Outdoor Unit Installation
6.
Refilling the refrigerant
Check the type of refrigerant to be used on the machine nameplate.
Precautions when adding R410A
Fill from the gas pipe in liquid form.
It is a mixed 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.
NOTE
National implementation of EU regulation on certain fluorinated greenhouse gases may require to provide the appropriate official
national language on the unit. Therefore an additional multilingual fluorinated greenhouse gases label is supplied with the unit.
Sticking instructions are illustrated on the backside of that label.
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.
3) Use separate thermal insulation for gas and liquid refrigerant pipes.
Gas side
Liquid side
Gas pipe
thermal insulation
Liquid pipe
thermal insulation
O.D. 12.7mm
O.D. 6.4mm
I.D. 14-16mm
I.D. 8-10mm
Minimum bend radius
Thickness 10mm Min.
40mm or more
30mm or more
Thickness 0.8mm (C1220T-O)
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.
Turn the cylinder upside-down
when filling.
Filling other cylinders
Please fill in with indelible ink,
the factory refrigerant charge of the product,
the additional refrigerant amount charged in the field and
the total refrigerant charge
on the refrigerant charge label supplied with the product.
Important information regarding the refrigerant used
This product contains fluorinated greenhouse gases covered
by the Kyoto Protocol. Do not vent gases into the atmosphere.
Refrigerant type:
GWP
value:
GWP = global warming potential
factory refrigerant charge of the
product:
see unit name plate
additional refrigerant amount
charged in the field
total refrigerant charge
Contains fluorinated greenhouse
gases covered by the Kyoto
Protocol
outdoor unit
refrigerant cylinder and manifold
for charging
The filled out label must be adhered in the
proximity of the product charging port
(e.g. onto the inside of the stop valve cover).
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
Inter-unit wire
Liquid pipe
Drain hose
Finishing tape
Gas pipe
insulation
Liquid pipe
insulation
