Mitsubishi Heavy Industries Technical Review Vol. 56 No. 4 (December 2019)1

FDTC series 4-way Ceiling Cassette Compact
Air-Conditioner featuring European Design

M i ts u b i s h i H e a v y I n d u s t r i e s T h e r m a l
S ystems, Ltd.

In the grid system ceilings common in European offices, lighting, ventilation holes, etc., arearranged to match the grid of the system ceiling, and air conditioners are also installed. For
compact cassette type indoor units often used in office applications, flat design panels that fit theentire ceiling design are preferred. To meet these market needs, we have developed a compact
cassette type indoor unit, the FDTC series, which fits system ceilings.

|1. Characteristics(1)

Use of European design
European refined design was adopted through cooperative design with German design
company Zweigrad (headquarters in Hamburg). In the pursuit of design properties, it gives adetailed and sophisticated impression, and features a timeless design that is high-class, modern
and doesn’t make you “feel the era.” The panel size of 620 mm × 620 mm was selected to fit
the grid of system ceilings of various standards. In addition, the panel thickness was reduced to10 mm so as not to damage the design of the entire ceiling without interference, even if lighting
or other equipment is installed in the adjacent space, and the protrusion from the ceiling surfaceof the system was minimized, making it possible to flatten the entire ceiling surface. A uniquehoneycomb structure was adopted for the suction grille part, smooth round edges were arranged
in appropriate places, and the gap dimensions between the components were unified as much as
possible to achieve a functional and stylish design. The louver of the air outlet is designed tohave a smooth round shape, and the gap between the louver and the opening is designed to be
as inconspicuous as possible when operation is stopped and the louver is closed. This creates aneven flatter impression as shown in Figure 1.

Figure 1 FDTC series appearance(2)

Draft prevention panel
The FDTC series features our patented draft prevention panel. Conventionally, a winddirection adjusting plate was installed near the air outlet as a field option when the user does notwant to be directly exposed to the wind from the air conditioner. However, once installed, itcannot be easily removed, and the appearance is negatively affected. Therefore, the draftMitsubishi Heavy Industries Technical Review 56 No. 4 (December 2019)2

prevention panel was built in, and the opening and closing operation by the user was enabled.
As a result, when the user does not want to be directly exposed to the wind, the draft prevention
panel is operated. Conversely, when the user wants to be exposed to the wind, the airconditioning plate is housed, and thus an air conditioning environment can be realizedaccording to the user’s taste at the time for each air outlet, as shown in Figure 2. The FDTC
panel, which is automatically housed when the air conditioner is turned off, was awarded theItalian A’ Design Award Gold Award for its aesthetic function and design.

Figure 2 The draft prevention panel operating
appearance

Figure 3 Air flow analysis results during
the draft prevention panel operation(3)Quietness
To satisfy the demand in Europe for quieter panel designs, the noise level at low air flow
was reduced to 25 dB (A), which is the top level in the industry, by optimizing air path design
with CFD (Computational Fluid Dynamics) as illustrated in Figure 3.
(4) Energy saving and comfort control using motion sensor
By controlling the preset temperature automatically according to the amount of humanactivity detected by a motion sensor, air conditioning that offers energy saving without
sacrificing comfort was enabled. The system is also equipped with a function that automaticallystops operation when a certain period of time elapses in the absence of a user, suppressing
wasteful operation.

|2. Specifications of FDTC
Table 1 shows the main specifications of the FDTC series.
Table 1

Specifications of FDTC Series (Building air conditioning indoor units for export)

FDTC indoor unit
15 KXZE1
Cooling kW
1.5
Rated capacity
HeatingkW
1.7
Cooling 3
Airflowm /min8-7-6-5
Heating
Noise
Cooling(sound powerdB (A) 49-48-46-43
Heatinglevel)
Noise
Cooling33-30-28-25(sounddB (A)33-30-26-22
pressure level) Heating
Indoormm
unit
Dimensions
Panelmm
WeightIndoorunitkgPanelkg

12.5

22 KXZE1
2.2
2.5

28 KXZE1
2.8
3.2

36 KXZE1
3.6
4.0

45 KXZE1
4.55.056 KXZE1
5.6
6.3

9-8-7-6

9-8-7-6

10-9-8-6

12-10-9-7

14-12-10-8

49-48-46-43

49-48-46-43

54-52-48-43

58-54-52-45

60-58-54-48

35-32-29-25

35-32-29-25

39-36-31-26

43-39-36-28

47-43-39-31

35-32-29-25

35-32-29-25

39-36-31-26

43-39-36-28

47-43-39-31

1414248 (H) x 570 (W) x 570 (D)
10 (H) x 620 (W) x 620 (D)
1313

14

Standard panel 3.0/Airflex panel 3.5|3. Future development
To differentiate us from other companies, we will continue to develop products that meetmarket needs as indoor units by adding external designs and functions that can be used effectively
by users in markets that focus on design properties.