Drain Piping; Refrigerant Piping Work; Flaring The Pipe End - McQuay M5WMY10KR Installation Manual

01_EN_3P257187-1A.fm Page 10 Thursday, November 12, 2009 12:01 PM
Indoor Unit Installation
6.

Drain piping

1) Connect the drain hose, as described right.
2) Remove the air filters and pour some water into the drain pan to check the water
flows smoothly.
3) If drain hose extension or embedded drain piping is required, use appropriate parts that match the hose front end.
[Figure of hose front end]
φ16
4) When extending the drain hose, use a commercially available
extension hose with an inner diameter of 16mm.
Be sure to thermally insulate the indoor section of the extension
hose.
5) When connecting a rigid polyvinyl chloride pipe
(nominal diameter 13mm) directly to the drain
hose attached to the indoor unit as with
embedded piping work, use any commercially
available drain socket (nominal diameter 13mm)
as a joint.

Refrigerant Piping Work

1.

Flaring the pipe end

1) Cut the pipe end with a pipe cutter.
2) Remove burrs with the cut surface facing downward
so that the chips do not enter the pipe.
3) Put the flare nut on the pipe.
4) Flare the pipe.
5) Check that the flaring is properly made.
WARNING
• Do not use mineral oil on flared part.
• Prevent mineral oil from getting into the system as this would reduce the lifetime of the units.
• Never use piping which has been used for previous installations. Only use parts which are delivered with the unit.
• Do never install a drier to this R410A unit in order to guarantee its lifetime.
• The drying material may dissolve and damage the system.
• Incomplete flaring may cause refrigerant gas leakage.
10
φ18
The drain hose provided
to indoor unit.
Set exactly at the position shown below.
Indoor unit
drain hose
φ16
The drain hose provided
Heat insulation tube
to indoor unit.
(field supply)
φ18
Commercially available drain
socket
(nominal diameter 13mm)
(Cut exactly at
right angles.) Remove burrs.
Flaring
A
Flare tool for R410A
Clutch-type Clutch-type (Rigid-type)
A 0-0.5mm 1.0-1.5mm
Die
Flare's inner
surface must
be flaw-free.
The drain hose should
be inclined downward.
No trap is permitted.
Do not put the end
of the hose in water.
Extension drain hose
Commercially available rigid
polyvinyl chloride pipe
(nominal diameter 13mm)
Conventional flare tool
Wing-nut type (Imperial-type)
1.5-2.0mm
Check
The pipe end must
be evenly flared in
a perfect circle.
Make sure that the
flare nut is fitted.
■English