Thermal Insulation Of Refrigerant Piping; Installing The Water Stopper; Installing The Sealing Material For Base Leg - Mitsubishi Electric CITY MULTI PQHY-P-YLM-A Serie Manual De Instalación

Because the refrigerant used with the unit is nonazerotropic, it must be
charged in the liquid state. Consequently, when charging the unit with
refrigerant from a cylinder, if the cylinder does not have a siphon pipe,
charge the liquid refrigerant by turning the cylinder upside-down as shown in
Fig.10.3.3. If the cylinder has a siphon pipe like that shown in the picture on
Fig.10.3.3, the liquid refrigerant can be charged with the cylinder standing
upright. Follow the cylinder specifications carefully. If the unit should
accidentally be charged with gas refrigerant, replace all the refrigerant with
new refrigerant. Do not use the refrigerant remaining in the cylinder.
[Fig. 10.3.3] (P.12)
A Siphon pipe B If the R410A cylinder does not have a siphon pipe.
10.4. Thermal insulation of refrigerant
piping
Add insulation to refrigerant piping by covering high-pressure/liquid pipe and
low-pressure/gas pipe separately with enough heat resistant polyethylene, so
that there isn't a gap insulation in the joint between indoor unit and insulation,
and itself. When insulation is insufficient, there is a possibility of condensation,
etc. Pay special attention to insulation in the ceiling plenum.
[Fig. 10.4.1] (P.12)
A Steel wire
C Asphaltic oily mastic or asphalt
E Outer covering B
Heat Glass fiber + Steel wire
insulation
Adhesive + Heat - resistant polyethylene foam + Adhesive tape
material A
Indoor Vinyl tape
Outer
Floor exposed Water-proof hemp cloth + Bronze asphalt
covering B
Heat source Water-proof hemp cloth + Zinc plate + Oily paint
Note:
• When using polyethylene as the insulation, asphalt shall not be
required.
• Do not insulate the electric wires.
[Fig. 10.4.2] (P.12)
A High-pressure/liquid pipe
D Finishing tape
[Fig. 10.4.3] (P.12)
Penetrations
[Fig. 10.4.4] (P.12)
<A> Inside wall (concealed)
<C> Outside wall (exposed)
<E> Roof pipe shaft
<F> Access hole on fire and boundary walls
Sleeve
A
Lagging
C
Band
E
Sleeve with edge
G
Mortar or other incombustible caulking
I
Explosion-resistant insulation
J
When filling a gap with mortar, cover the access hole part with steel plate so that
the insulation will not caved in. Use incombustible materials for both insulation
and covering. (Vinyl covering should not be used.)
• Insulation for the pipes to be added on site must meet the following
specifications:
Heat source unit
High-pressure pipe
-BC controller
Low-pressure pipe
for PQRY-P·Y(S)LM-A
Pipe size 6.35 to 25.4 mm
BC controller
[1/4 to 1 in]
-indoor unit
Pipe size 28.58 to 38.1 mm
for PQRY-P·Y(S)LM-A
[1-1/8 to 1-21/32 in]
Pipe size 6.35 to 25.4 mm
Heat source unit
[1/4 to 1 in]
-indoor unit
Pipe size 28.58 to 38.1 mm
for PQHY-P·Y(S)LM-A
[1-1/8 to 1-21/32 in]
Temperature Resistance 100°C [212°F] min.
* If pipes are located in a high-temperature high-humidity environment, such
as the top floor of a building, insulation thicker than the ones specified in the
chart above.
* When the client presents certain specifications, ensure that those also meet
the specifications on the chart above.
30
B Piping
D Insulation material A
B Low-pressure/gas pipe C Electric wire
E Insulation
<B> Outside wall
<D> Floor (waterproofing)
Insulation
B
Caulking material
D
Waterproofing layer
F
Lagging material
H
10 mm [13/32 in] or more
20 mm [13/16 in] or more
10 mm [13/32 in]
or more
15 mm [19/32 in]
or more
10 mm [13/32 in]
or more
15 mm [19/32 in]
or more

10.5. Installing the water stopper

Make sure to install the supplied water stopper and sealing material when
providing insulation.
* When using PQRY-P series, install them to only the low-pressure pipe.
* When using PQHY-P series, install them to both liquid pipe and gas pipe.
Use the water stoppers and sealing material that fit each pipe.
[Fig. 10.5] (P.13)
A Position the edge of the supplied paper with mark at the edge of the pipe
cover. Then, wind the sealing material to the pipe, using the mark on the
paper to properly align it.
B Extend the field-supplied insulation all the way to the end of the sealing
material described in step A.
C Install the water stopper at the end face of the insulation.
D Mark
E Install the sealing material so that the edges of the material meet at the top.
F Inside the unit
G Pipe cover
H The seam of the insulation should be at the top.
I Sealing material for water stopper
J Install the water stopper so that the slit of the water stopper is at the top.
K Water stopper
L Sealing material for field piping
10.6. Installing the sealing material for base
leg
[Fig. 10.6] (P.13)
A Enlarged view
B Sealing material attachment process
C Process 1: Attach the sealing material (for base leg) 1.
D Process 2: Attach the sealing material (for base leg) 2.
E Process 3: Attach the sealing material (for water panel). (only right front)
F Panel assy W
G Only sealing materials (for base leg) 1, 2
H Sealing materials (for base leg) 1, 2 and sealing material (for water panel)
I Sealing material (for base leg) 1
J Sealing material (for base leg) 2
K Sealing material (for water panel) (only right front)
L Put sealing material inward.
M Match the end face.