Mitsubishi Electric CITY MULTI CMB-WP108NU-AA Manual De Instalación página 7

HBC controller 1 HBC controller 2
Slope of twinning pipes (high-pressure side and low-pressure side)
When using twinning pipes on the high-pressure piping and the low-pressure piping, connect them
horizontally.
If the slope exceeds the specified angle, it may cause lack of capacity.
Notes:
• Have a fire extinguisher nearby before brazing work.
• Provide no-smoking signs at the brazing workplace.
• After pipe connection, be sure to check that there is no gas leakage, using
a leak detector or soap-and-water solution.
• Before brazing the refrigerant piping, always wrap the piping on the main
body, and the thermal insulation piping, with damp cloths to prevent heat
shrinkage and burning the thermal insulation tubing. Take care to ensure
that the flame does not come into contact with the main body itself.
• Do not use leak-detection additives.
• Straight run of pipe connecting twinning pipe is 500 mm [19-11/16 in] or
more.
• Piping work shall be kept to a minimum.
• The pipes shall be protected from physical damage.
Warning:
Do not mix anything other than the specified refrigerant (R410A) into the
refrigerating cycle when installing or moving. Mixing air may cause the
refrigerating cycle to reach abnormally high temperature, resulting in burst pipes.
Caution:
Cut the tip of the outdoor unit piping, remove the gas, and then remove the
brazed cap.
[Fig. 4.2.2]
A
B
A Cut here
4.3. Insulating pipes
Be sure to add insulation work to piping by covering high-temperature pipe and low-
temperature pipe separately with enough thickness heat-resistant polyethylene
foam, so that no gap is observed in the joint between the HBC controller and
insulating material, and insulating materials themselves. When insulation work is
insufficient, there is a possibility of condensation. Pay special attention to insulation
work in the ceiling plenum.
[Fig. 4.3.1]
C
B
A
D
E F
A Locally procured insulating material for pipes
B Bind here using band or tape.
D Lap margin: more than 40 mm [1-5/8 in] E Insulating material (field supply)
F Unit side insulating material
• Insulation materials for the pipes to be added on site must meet the following
specifications:
Outdoor unit High-pressure pipe
-HBC controller Low-pressure pipe
Temperature Resistance 100°C [212°F] min.
• Installation of pipes in a high-temperature high-humidity environment, such as
the top floor of a building, may require the use of insulation materials thicker than
the ones specified in the chart above.
• When certain specifications presented by the client must be met, ensure that
they also meet the specifications on the chart above.
• The brazed connections must be covered with insulation, with its seam facing
upward and fastened with the bands.
4.4. Additional refrigerant charge
Notes:
• Charge refrigerant in a liquid state.
- Charging refrigerant in the gaseous state will change the composition of the
refrigerant and lead to a performance drop.
• Do not use a charging cylinder when charging refrigerant.
- The use of a charging cylinder may change the composition of the refrigerant
and lead to a performance drop.
• For the connection with outdoor units other than those listed in the table,
refer to the Databook of the HBC controller.
(Unit: mm [in])
Pipe size
ø15.88 [5/8] (Brazing)
B Remove brazed cap
C Do not leave any opening.
10 mm [13/32 in] or more
20 mm [13/16 in] or more
The table below summarizes the factory-charged amount of refrigerant, the
maximum amount of refrigerant to be added on site, and the maximum total amount
of refrigerant in the system.
The amount of refrigerant that is shown in the table below is factory-charged in the
outdoor units. The amount necessary for extended piping is not included and needs
to be added on site.
Factory-charged
Unit model
amount [kg (oz)]
PURY-P72T/YNU 5.2 (184)
PURY-P96T/YNU 8.0 (283)
PURY-P120T/YNU 8.0 (283)
PURY-P144T/YNU 10.8 (381)
PURY-P168T/YNU 10.8 (381)
The amount of refrigerant that is shown in the table below is the maximum amount to
be added on site.
Maximum amount
Unit model to be added
[kg (oz)]
PURY-P72T/YNU 21 (741)
PURY-P96T/YNU 25.4 (896)
PURY-P120T/YNU 25.4 (896)
PURY-P144T/YNU 33.1 (1168)
PURY-P168T/YNU 33.1 (1168)
Both refrigerant overcharge and undercharge will cause problems. Charge the
system with the proper amount of refrigerant.
Record the added refrigerant amount on the label attached to the control box panel
for future servicing.
Calculation of the amount of additional refrigerant
• The amount of refrigerant to be added depends on the size and the total
length of the high-pressure piping and liquid piping.
• Calculate the amount of refrigerant to be charged according to the formula below.
• Round up the calculation result to the nearest 0.1 kg (0.1 oz).
• The refrigerant does not need to be added for the indoor units in a Hybrid
City Multi system.
■ (E)P72 to 168T/YNU (R410A refrigerant)
(1) Units "m" and "kg"
<Formula>
• When the piping length from the outdoor unit to the farthest HBC controller is
30.5 m (100 ft) or shorter
Amount of High-pressure pipe
additional = ø22.2 total length
charge (kg) × 0.23 (kg/m)
Outdoor unit model
PURY-(E)P72T/
YNU
PURY-(E)P96T/
YNU
+
PURY-(E)P120T/
YNU
PURY-(E)P144T/
YNU
PURY-(E)P168T/
YNU
Table <A>
* Amount of refrigerant to be charged for
single-module units
* In the case all connected indoor unit
models are Case 1, do Not add the
refrigerant listed in table <A>.
Instead, add the following amount of
refrigerant.
Case 1: PEFY-WL06/24NMAU-A**
→Add 0.55 kg per PEFY-WL06/24NMAU-A**.
Factory-charged
Unit model
amount [kg (oz)]
PURY-EP72T/YNU 5.2 (184)
PURY-EP96T/YNU 8.0 (283)
PURY-EP120T/YNU 8.0 (283)
PURY-EP144T/YNU 10.8 (381)
PURY-EP168T/YNU 10.8 (381)
Maximum amount
Unit model to be added
[kg (oz)]
PURY-EP72T/YNU 21 (741)
PURY-EP96T/YNU 25.4 (896)
PURY-EP120T/YNU 25.4 (896)
PURY-EP144T/YNU 33.1 (1168)
PURY-EP168T/YNU 33.1 (1168)
High-pressure pipe High-pressure pipe
+ ø19.05 total length + ø15.88 total length
× 0.16 (kg/m) × 0.11 (kg/m)
Amount (kg/HBC
Amount (kg)
controller)
+
1.5 3.0
1.5
3.0
2.5
4.0
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