Refrigerant Piping - Toshiba MML-UP0071BH-UL Installation Manual

 Pipe material, size and insulator
The following materials for piping work and insulating process are procured locally.
Pipe material PVC pipe, pipe elbow (Nominal outer diameter Ø0.8" (20 mm))
Insulator Foamed polyethylene foam, thickness: 0.4" (10 mm) or more
Drain pan
Drain hose
Use adhesive for PVC pipe
PVC pipe
Elbow
Insulation
 Connecting drain pipe
Insert the drain hose into the connector until the hose can go no farther.
REQUIREMENT
• Connect the hard vinyl chloride pipes by using adhesive agents for vinyl chloride so that water does not leak.
• It takes some time to dry and indurate the adhesive agent. (Refer to the manual of adhesive agent.) Do not apply any
extra force on the connecting section until the adhesive agent is dried.
CAUTION
Sometimes, debris will accumulate in the drain pan while installation work is in progress. Remove the drain filter from
the drain pan and clean it.
After cleaning the drain filter, replace it in the drain pan.
 Check the draining
Pour water on the drain pan. Confirm that water drains well and does not leak from the drain hose connecting part.
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Drain filter
6

Refrigerant piping

CAUTION
When the refrigerant pipe is long, provide support
brackets at intervals of 8'2" to 9'10" (2.5 to 3 m) to clamp
the refrigerant pipe. Otherwise, abnormal sound may be
generated.
Use the flare nut attached with the indoor unit or R410A
flare nut.
 Permissible piping length and
height difference
They vary depending on the outdoor unit. For details,
refer to the Installation Manual attached to the outdoor
unit.
 Pipe size
Unit: in(mm)
Pipe size
Model MML-
Gas side Liquid side
UP007 to UP012 3/8" (9.5)
UP015, UP018 1/2" (12.7)
UP024 5/8" (15.9)
 Connecting refrigerant piping
Flaring
1
Cut the pipe with a pipe cutter.
Remove burrs completely. (Remaining burrs may
cause gas leakage.)
2
Insert a flare nut into the pipe, and flare the
pipe.
Use the flare nut provided with the unit or the one
used for the R410A refrigerant. The flaring
dimensions for R410A are different from the ones
used for the conventional R22 refrigerant. A new
flare tool manufactured for use with the R410A
refrigerant is recommended, but the conventional
tool can still be used if the projection margin of the
copper pipe is adjusted to be as shown in the
following table.
– 6 –
Projection margin in flaring: B
Outer dia. of
R410A tool used
copper pipe
1/4" to 5/8" 0 to 0.02"
(6.4 to 15.9) (0 to 0.5)
Flaring diameter size: A
Outer dia. of copper pipe
1/4" (6.4)
3/8" (9.5)
1/4" (6.4)
1/2" (12.7)
1/4" (6.4)
5/8" (15.9)
3/8" (9.5)
A
* In case of flaring for R410A with the conventional
flare tool, pull it out approx. 0.02" (0.5 mm) more than
that for R22 to adjust to the specified flare size. The
copper pipe gauge is useful for adjusting projection
margin size.
• The sealed gas was sealed at the atmospheric
pressure so when the flare nut is removed, there will
be no "whooshing" sound: This is normal and is not
indicative of trouble.
• Use two spanners to connect the indoor unit pipe.
Work using two spanners
Unit: in (mm)
Conventional
tool used
0.04" to 0.06"
(1.0 to 1.5)
Unit: in (mm)
A +0
–0.02" (0.4)
0.36" (9.1)
0.52" (13.2)
0.65" (16.6)
0.78" (19.7)
EN
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