DESC:TECHNICAL FIELD
[001] The embodiments herein generally relate to air conditioners and more particularly, to an inbuilt water drain system for an indoor unit of the air conditioner, which prevents accumulation of water, leakage of water and accumulation of particulate matter thereby preventing blockage of drain outlet of the indoor unit, resulting in smooth removal of condensed water without water overflow in the indoor room.

BACKGROUND
[002] During regular operation of an air conditioner, water condensation occurs on evaporator coil(s) due to ambient temperature and humidity while a compressor is ON. Additionally, the water vapors present in atmospheric air also gets condensed on the evaporator coil. The water generated from both these sources gets accumulated in the reservoir of indoor unit chassis. Further, the particulate matter present in the room atmosphere gets settled on the evaporator coil during normal operation. This particulate matter along with the accumulated water over time results in scale formation. After a time period, scaling blocks the drain outlet of drain tray of air conditioner which in turn prevents the water to flow to the external drain pipe, resulting in water overflow in the indoor room. In conventional air conditioners, the water which gets accumulated in reservoir of the indoor unit chassis along with particulate matter drains through the drainpipe that is connected to a drain outlet of a drain tray of the reservoir due to gravity. Draining through gravity is subjected to low stability of the water drain system as once a drainage pipeline is blocked, the drainage function cannot be normally realized. Another conventional air conditioner includes usage of drainage pumps for effectively discharging the condensed water. The drainage pump is located external to the air conditioner indoor unit and requires various other additional arrangements to remove the water or blockage. The aforementioned water drainage arrangement consumes more packaging space which is not desired by the user. Further, the dry run of drainage pump may reduce the operating efficiency of the pump due to unavailability of required water at the pump inlet side.
[003] Therefore, there exists a need for an inbuilt water drain system in an air conditioner, which obviates the aforementioned drawbacks.

OBJECTS

[004] The principal object of embodiments herein is to provide an inbuilt water drain system for an indoor unit of the air conditioner, which prevents accumulation of water, leakage of water and accumulation of particulate matter thereby preventing blockage of drain outlet of the indoor unit, resulting in smooth removal of condensed water without water overflow in the indoor room.
[005] Another object of embodiments herein is to provide a dual action water drain system for the air conditioner, where the one action of the water drain system being draining accumulated water through gravity when the level of accumulated water in the reservoir of indoor unit reaches a predefined limit, and the other action of the water drain system being forced draining of accumulated water by using pump when the level of accumulated water rises above the predefined limit and reaches a threshold level.
[006] Another object of embodiments herein is to provide the inbuilt water drain system for the air conditioner, which consumes less packaging space.
[007] Another object of embodiments herein is to provide the inbuilt water drain system for the air conditioner, which is concealed when the indoor unit of the air conditioner is installed to the wall.
[008] Another object of embodiments herein is to provide the inbuilt water drain system for the air conditioner, which facilitates removal of particulate matter and avoids the precipitation and scale formation at the drain location sump of the chassis of indoor unit and drainpipe.
[009] Another object of embodiments herein is to provide the inbuilt water drain system for the air conditioner, which effectively drains water in various humidity conditions.
[0010] Another object of embodiments herein is to provide the inbuilt water drain system for the air conditioner, which effectively drains the water even when the drainpipe sometimes gets partly pinched due to improper installation, resulting in water accumulation in the indoor unit reservoir.
[0011] Another object of embodiments herein is to provide the inbuilt water drain system for the air conditioner, which effectively drains the water irrespective of the orientation of the drainpipe (the disorientation of the drainpipe which usually happens due to improper installation).
[0012] Another object of embodiments herein is to provide the inbuilt water drain system for the air conditioner, which ensures timely removal of accumulated water from the reservoir of the indoor unit of air conditioner.
[0013] These and other objects of embodiments herein will be better appreciated and understood when considered in conjunction with following description and accompanying drawings. It should be understood, however, that the following descriptions, while indicating embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.

BRIEF DESCRIPTION OF DRAWINGS
[0014] The embodiments are illustrated in the accompanying drawings, throughout which like reference letters indicate corresponding parts in various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:
[0015] FIG. 1 depicts a perspective view of an indoor unit of an air conditioner with an inbuilt water drain system, according to embodiments as disclosed herein;
[0016] FIG. 2 illustrates detail A of the inbuilt water drain system, according to embodiments as disclosed herein;
[0017] FIG. 3 depicts an exploded perspective view of the inbuilt water drain system, according to embodiments as disclosed herein;
[0018] FIG. 4 depicts a perspective view of a water reservoir of the indoor unit in which a float sensor is mounted on a motor cover, according to embodiments as disclosed herein;
[0019] FIG. 5 depicts detail (B) of the float sensor positioned mounted on the motor cover, according to embodiments as disclosed herein;
[0020] FIG. 6 depicts a cross-sectional view of the inbuilt water drain system integrated to the indoor unit of the air conditioner, according to embodiments as disclosed herein;
[0021] FIG. 7 depicts detail (C) of the inbuilt water drain system integrated to the indoor unit of the air conditioner, according to embodiments as disclosed herein;
[0022] FIG. 8 depicts a block diagram which shows communication between a controller unit, the float sensor and a pump of the inbuilt water drain system, according to embodiments as disclosed herein;
[0023] FIG. 9 depicts a perspective view of an inlet duct of the inbuilt water drain system, according to embodiments as disclosed herein;
[0024] FIG. 10 depicts a side view of the inlet duct, , according to embodiments as disclosed herein;
[0025] FIG. 11 depicts a perspective view of an intermediate duct of the inbuilt water drain system, according to embodiments as disclosed herein;
[0026] FIG. 12 depicts a front view of the intermediate duct, according to embodiments as disclosed herein;
[0027] FIG. 13 depicts a perspective view of an outlet duct of the inbuilt water drain system, according to embodiments as disclosed herein;
[0028] FIG. 14 view of cross-sectional view of the outlet duct, according to embodiments as disclosed herein; and
[0029] FIG. 15 depicts a flowchart showing steps of a method for draining accumulated water from the water reservoir in the indoor unit of the air conditioner, according to embodiments as disclosed herein.

DETAILED DESCRIPTION
[0030] The embodiments herein and the various features and advantageous details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein may be practiced and to further enable those of skill in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0031] The embodiments herein achieve inbuilt water drain system for an indoor unit of the air conditioner, which prevents accumulation of water, leakage of water and accumulation of particulate matter thereby preventing blockage of drain outlet of the indoor unit, resulting in smooth removal of condensed water without water overflow in the indoor room. Further, embodiments herein achieve inbuilt water drain system for the air conditioner, which consumes less packaging space. Referring now to the drawings Figs 1 through 15, where similar reference characters denote corresponding features consistently throughout the figures, there are shown embodiments.
[0032] FIG. 1 depicts a perspective view of an indoor unit (12) of an air conditioner (10) with an inbuilt water drain system (100), according to embodiments as disclosed herein. FIG. 2 illustrates detail A of the inbuilt water drain system (100), according to embodiments as disclosed herein. In an embodiment, the inbuilt water drain system (100) includes an inlet duct (102), a pump (104), an intermediate duct (106), an outlet duct (108), a controller unit ((110), (as shown in fig. 8)) and a float sensor (112). For the purpose of this description and ease of understanding, the inbuilt water drain system (100) is explained herein with below reference to be provided in the air conditioner (10) for effective draining of condensed water accumulated in the water reservoir (14) of the indoor unit (12) even when a drain outlet (14P) of a drain tray (14T) of the water reservoir (14) is blocked, and irrespective of the orientation of the drain pipe. However, it is also within the scope of the invention to practice/use the inbuilt water drain system (100) for draining water from a washing machine or refrigerator or any other machine, where draining of accumulated water is required, without otherwise deterring the intended function of the inbuilt water drain system (100) as can be deduced from the description and corresponding drawings.
[0033] FIG. 9 depicts a perspective view of an inlet duct (102) of the inbuilt water drain system (100), according to embodiments as disclosed herein. FIG. 10 depicts a side view of the inlet duct (102), according to embodiments as disclosed herein. An inlet (102i) of the inlet duct (102) is connected to a drain outlet (14P) which is defined on a drain tray (14T) of the water reservoir (14). An outlet (102p) of the inlet duct (102) is connected to an inlet ((104i), (as shown inn fig. 3)) of the pump (104). The inlet duct (102) includes a first portion (102A) and a second portion (102B). The second portion (102B) angularly extends from the first portion (102A). An angle between a longitudinal axis (102X) of the second portion (102B) and a center horizontal plane (102H) of the first portion (102A) is at least 14.3o ± 0.1?. The inlet (102i) of the inlet duct (102) is defined in the first portion (102A). The outlet (102p) of the inlet duct (102) is defined in the second portion (102B). The second portion (102B) is tapered in a direction towards the outlet (102p) of the inlet duct (102). A diameter of the second portion (102B) at the outlet (102p) is lesser than a diameter of the first portion (102A) at the inlet (102i). The first portion (102A) has an inner diameter of at least 16.8 ± 0.1 mm and an outer diameter of at least 21.5 mm. A length of first portion (102A) is at least 20 mm. The portion (102BB) of the second portion (102B) which adjoins the first portion (102A) has an inner diameter of 13.5 mm. The second portion (102B) at the outlet (102p) has an inner diameter of 8± 0.1 mm and an outer diameter of 13 mm. A distance between the longitudinal axis (102X) of the second portion (102B) at center of the outlet (102p) and a center horizontal plane (102H) of the first portion (102A) is 10.3 mm. A distance between the outlet (102p) of the second portion (102B) and a center vertical plane (102V) of the first portion (102A) is at least 26.3 ± 0.1 mm.
[0034] The pump (104) is in communication with the controller unit (110). The mounting bracket (105) is adapted to mount the pump (104) thereon by using fasteners. The mounting bracket (105) is made of flame-retardant high impact polystyrene (HIPS).
[0035] FIG. 11 depicts a perspective view of an intermediate duct (106) of the inbuilt water drain system (100), according to embodiments as disclosed herein. FIG. 12 depicts a front view of the intermediate duct (100), according to embodiments as disclosed herein. An inlet (106i) of the intermediate duct (106) is connected to an outlet ((104p), (as shown in fig. 3)) of the pump (104). The intermediate duct (106) includes a first portion (106A), an intermediate portion (106B) and a second portion (106C). The intermediate portion (106B) angularly extends from the first portion (106A). The second portion (106C) extends from the intermediate portion (106B). The inlet (106i) of the intermediate duct (106) is defined in the first portion (106A). The outlet (106p) of the intermediate duct (106) is defined in the second portion (106B). The first portion (106A) of the intermediate duct (106) has an inner diameter of at least 8± 0.1 mm and an outer diameter of at least 13 mm. A length of said first portion (106A) of the intermediate duct (106) is at least 11± 0.2 mm. The second portion (106C) of the intermediate duct (106) has an inner diameter of at least 8± 0.1 mm and an outer diameter of at least 13 mm. An angle between a longitudinal axis (106BX) of the intermediate portion (106B) and a center horizontal plane (106H) of the first portion (106A) of the intermediate duct (106) is at least 144.1?. A distance between the outlet (106p) and a center vertical plane (106V) of the intermediate duct (106) is at least 48± 0.2 mm. A distance between a longitudinal axis (106CX) of the second portion (106C) and the center horizontal plane (106H) of the first portion (106A) of the intermediate duct (106) is 16.7± 0.2 mm. A distance between the outlet (106p) and a point of intersection of the longitudinal axis (106CX) of the second portion (106C) and the longitudinal axis (106BX) of the intermediate portion (106B) of the intermediate duct (106) is 25± 0.1 mm. A distance between the longitudinal axis of the second portion (106C) and the inlet (106i) of said intermediate duct (106) is at least 21 ± 0.2 mm.
[0036] FIG. 13 depicts a perspective view of an outlet duct (108) of the inbuilt water drain system (100), according to embodiments as disclosed herein. FIG. 14 view of cross-sectional view of the outlet duct (108), according to embodiments as disclosed herein. An inlet (108i) of the outlet duct (108) is connected to an outlet (106p) of the intermediate duct (106), and an outlet (108p) of the outlet duct (108) is connected to a drain pipe (not shown). The outlet duct (108) includes a first portion (108A) and a second portion (108B) transversely extending from the first portion (108A). The inlet (108i) of the outlet duct (108) is defined in the first portion (108A). The outlet (108p) of the second duct (108) is defined in the second portion (108B). A diameter of the first portion (108A) is lesser than a diameter of the second portion (108B) of the outlet duct (108). The first portion (108A) of the outlet duct (108) has an inner diameter of 6 ± 0.1 mm and an outer diameter of 8.6 ± 0.1 mm. The second portion (108B) of the outlet duct (108) has an inner diameter of 12.4 ± 0.1 mm and an outer diameter of 16 ± 0.1 mm. A distance between a longitudinal axis (108AX) of the first portion (108A) and the outlet (108p) of the outlet duct (108) is at least 45 ± 0.1 mm. A distance between a longitudinal axis (108BX) of the second portion (108B) and the inlet (108i) of the outlet duct (108) is at least 25.5 ± 0.1 mm.
[0037] The float sensor (112) is in communication with the controller unit (110). The float sensor (112) is configured to detect a level of the accumulated water in the water reservoir (14) and send signals to the controller unit (110) upon the accumulated water level reaching a threshold level (FAL) in the water reservoir (14). The controller unit (110) is configured to receive the signals from the float sensor (112) and actuate the pump (104) which in turn facilitates pumping of the accumulated water from the water reservoir (14) to the drainpipe via the ducts (102, 106, 108) when the level of the accumulated water is reached to the threshold level (FAL). The threshold level (FAL) of the accumulated water in the water reservoir (14) is a float sensor activation level ((FAL), (as shown in fig. 7)). The float sensor (112) is mounted onto a motor cover (16) of the indoor unit (12) of the air conditioner (10) and is located in the drain tray (14T) in vicinity of the drain outlet (14P). The ducts (102, 106, 108) are adapted to reduce noise of water flow during operation of said pump (104).
[0038] The float sensor (112) is configured to send signal to the controller unit (110) upon the accumulated water level falls below the threshold level (FAL) in the water reservoir (14) and accordingly the controller unit (110) is configured to de-actuate the pump (104) to facilitate siphoning of accumulated water from the water reservoir (14) to the drain pipe through the ducts (102, 106, 108) due to gravity on the accumulated water level reaching the predefined limit (GAL) in the water reservoir (14). The predefined limit (GAL) of the accumulated water in the water reservoir (14) is a gravity activation level (GAL). The gravity activation level (GAL) of the accumulated water is defined below the float sensor activation level (FAL) in the reservoir (14).
[0039] The intermediate duct (106) is adapted to retain the accumulated water at least between the inlet (106i) of the intermediate duct (106) and the drain outlet (14P) when the accumulated water level falls below the predefined limit (gravity activation level (GAL)) and reaches a drain outlet level ((DOL), (as shown in fig. 7)) in the water reservoir (14) thereby preventing dry running of the pump (104) during its subsequent operation by the controller unit (110) on the accumulated water level reaching the threshold level (FAL). The drain outlet level (DOL) is defined at the drain outlet (14P) and is defined below the gravity activation level (GAL) in the water reservoir (14). At least a portion of the intermediate duct (106) is positioned a plane which is above the drain outlet (14P) of the drain tray 14).
[0040] FIG. 15 depicts a flowchart showing steps of a method (200) for draining accumulated water from the water reservoir (14) in the indoor unit (12) of the air conditioner (10), according to embodiments as disclosed herein. For the purpose of this description and ease of understanding, the method (200) is explained herein with below reference to draining accumulated water from the water reservoir (14) in the indoor unit (12) of the air conditioner (10) even when a drain outlet (14P) of a drain tray (14) of the water reservoir (14) is blocked, and irrespective of the orientation of the drain pipe. However, it is also within the scope of this invention to practice/implement the entire steps of the method (200) in a same manner or in a different manner or with omission of at least one step to the method (200) or with any addition of at least one step to the method (200) for draining accumulated water from a washing machine or refrigerator or any other machine, where draining of accumulated water is required, without otherwise deterring the intended function of the method (200) as can be deduced from the description and corresponding drawings. At step (200), the method (200) includes, siphoning, by ducts (102, 106, 108) in fluid communication with a drain outlet (14P) of a drain tray (14T), the accumulated water from the water reservoir (14) to a drain pipe due to gravity on the level of the accumulated water reaching a predefined limit (GAL) in the water reservoir (14).
[0041] At step (204), the method (200) includes, detecting by, a float sensor (112), a level of the accumulated water in the water reservoir (14) and sending, by the float sensor (112), one or more signals to a controller unit (110) upon the accumulated water level reaching a threshold level (FAL) in the water reservoir (14). At step (206), the method (200) includes, actuating, by the controller unit (110), a pump (104) based on the signal sent by the float sensor (112) to the controller unit (110). At step (208), the method (200) includes, pumping, by the pump (104), the accumulated water from the water reservoir (14) to the drain pipe the ducts (102, 106, 108) upon operating the pump (104) by the controller unit (110) when the accumulated water level is reached to the threshold level (FAL) in the water reservoir (14). At step (210), the method (200) includes, sending, by the float sensor (112), signals to the controller unit (110) upon the accumulated water level falls below the threshold level (FAL) in the water reservoir (14). At step (212), the method (200) includes, de-actuating, by the controller unit (110), the pump (104) based on the signal sent by the float sensor (112) to the controller unit (110) upon the accumulated water level falls below the threshold level (FAL) in the water reservoir (14). At step (214), the method (200) includes, siphoning, by the ducts (102, 106, 108), accumulated water from the water reservoir (14) to the drain pipe due to gravity when the accumulated water level falls below the threshold level (FAL) and reaches the predefined limit (GAL) in the water reservoir (14). At step (216), the method (200) includes, retaining, by the duct (106), the accumulated water at least between an inlet (106i) of an intermediate duct (106) and a drain outlet (14P) of a dray tray (14T) of the water reservoir (14) when the accumulated water level falls below the predefined limit (GAL)) and reaches a drain outlet level (DOL) in the water reservoir (14) thereby preventing dry running of the pump (104) during its subsequent operation by the controller (110) on the accumulated water level reaching the threshold level (FAL).
[0042] The technical advantages of the inbuilt water drain system (100) are as follows. The inbuilt water drain system prevents accumulation of water, leakage of water and accumulation of particulate matter thereby preventing blockage of drain outlet of the indoor unit, resulting in smooth removal of condensed water without water overflow in the indoor room. The dual action water drain system facilitates draining of accumulated water through gravity when the level of accumulated water in the reservoir of indoor unit reaches a predefined limit, and also facilitates draining of accumulated water by using pump when the level of accumulated water rises above the predefined limit and reaches a threshold level. The inbuilt water drain system is concealed when the indoor unit of the air conditioner is installed to the wall and also consumes less packaging space. The inbuilt water drain system facilitates removal of particulate matter and avoids the precipitation and scale formation at the drain location sump of the chassis of indoor unit and drain pipe. The inbuilt water drain system effectively drains water in various humidity conditions. The inbuilt water drain system effectively drains the water even when the drainpipe sometimes gets partly pinched due to improper installation, resulting in water accumulation in the indoor unit reservoir. The inbuilt water drain system ensures timely removal of accumulated water from the reservoir of the indoor unit of air conditioner.
[0043] The foregoing description of the specific embodiments will so fully reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modifications within the spirit and scope of the embodiments as described herein.
,CLAIMS:We claim,
1. An inbuilt water drain system (100) for an air conditioner (10), said inbuilt water drain system (100) comprising:
a pump (104) in communication with a controller unit (110);
an inlet duct (102), wherein an inlet (102i) of said inlet duct (102) is connected to a drain outlet (14P) which is defined on a drain tray (14T) of a water reservoir (14), and an outlet (102p) of said inlet duct (102) is connected to an inlet (104i) of said pump (104);
an intermediate duct (106), wherein an inlet (106i) of said intermediate duct (106) is connected to an outlet (104p) of said pump (104);
an outlet duct (108), wherein an inlet (108i) of said outlet duct (108) is connected to an outlet (106p) of said intermediate duct (106), and an outlet (108p) of said outlet duct (108) is connected to a drain pipe; and
a float sensor (112) in communication with said controller unit (110), said float sensor (112) is configured to detect a level of the accumulated water in the water reservoir (14) and send signals to said controller unit (110) upon the accumulated water level reaching a threshold level (FAL) in the water reservoir (14),
wherein
said controller unit (110) is configured to receive the signals from said float sensor (112) and actuate said pump (104) which in turn facilitates pumping of the accumulated water from the water reservoir (14) to the drainpipe via said ducts (102, 106, 108) when the level of the accumulated water is reached to the threshold level (FAL).

2. The inbuilt water drain system (100) as claimed in claim 1, wherein said threshold level (FAL) of the accumulated water in the water reservoir (14) is a float sensor activation level (FAL);
said float sensor (112) is mounted onto a motor cover (16) of an indoor unit (12) of the air conditioner (10) and is located in the drain tray (14T) in vicinity of the drain outlet (14P); and
said ducts (102, 106, 108) are adapted to reduce noise of water flow during operation of said pump (104).

3. The inbuilt water drain system (100) as claimed in claim 2, wherein said float sensor (112) is configured to send signal to said controller unit (110) upon the accumulated water level falls below said threshold level (FAL) in the water reservoir (14) and accordingly said controller unit (110) is configured to de-actuate said pump (104) to facilitate siphoning of accumulated water from the water reservoir (14) to the drain pipe through said ducts (102, 106, 108) due to gravity on the accumulated water level reaching the predefined limit (GAL) in the water reservoir (14);
the predefined limit (GAL) of the accumulated water in the water reservoir (14) is a gravity activation level (GAL); and
said gravity activation level (GAL) of the accumulated water is defined below said float sensor activation level (FAL) in the reservoir (14).

4. The inbuilt water drain system (100) as claimed in claim 3, wherein said intermediate duct (106) is adapted to retain the accumulated water at least between the inlet (106i) of said intermediate duct (106) and the drain outlet (14P) when the accumulated water level falls below said predefined limit (gravity activation level (GAL)) and reaches a drain outlet level (DOL) in the water reservoir (14) thereby preventing dry running of said pump (104) during its subsequent operation by said controller (110) on the accumulated water level reaching said threshold level (FAL);
said drain outlet level (DOL) is defined at the drain outlet (14P) and is defined below said gravity activation level (GAL) in the water reservoir (14); and
at least a portion of said intermediate duct (106) is positioned a plane which is above the drain outlet (14P) of the drain tray 14).

5. The inbuilt water drain system (100) as claimed in claim 1, wherein said system (100) includes a mounting bracket (105) adapted to mount said pump (104) thereon; and
said mounting bracket (105) is made of a flame-retardant high impact polystyrene (HIPS).

6. The inbuilt water drain system (100) as claimed in claim 1, wherein said inlet duct (102) includes a first portion (102A) and a second portion (102B), wherein said second portion (102B) angularly extends from said first portion (102A), where an angle between a longitudinal axis (102X) of said second portion (102B) and a center horizontal plane (102H) of said first portion (102A) is at least 14.3o ± 0.1o,
wherein
said inlet (102i) of said inlet duct (102) is defined in said first portion (102A);
said outlet (102p) of said inlet duct (102) is defined in said second portion (102B);
said second portion (102B) is tapered in a direction towards said outlet (102p) of said inlet duct (102);
a diameter of said second portion (102B) at said outlet (102p) is lesser than a diameter of said first portion (102A) at said inlet (102i);
said first portion (102A) has an inner diameter of at least 16.8 ± 0.1 mm and an outer diameter of at least 21.5 mm;
a portion (102BB) of said second portion (102B) which adjoins said first portion (102A) has an inner diameter of 13.5 mm;
said second portion (102B) at said outlet (102p) has an inner diameter of 8± 0.1 mm and an outer diameter of 13 mm;
a length of first portion (102A) is at least 20 mm;
a distance between the longitudinal axis (102X) of said second portion (102B) at center of said outlet (102p) and a center horizontal plane (102H) of said first portion (102A) is 10.3 mm; and
a distance between said outlet (102p) of said second portion (102B) and a center vertical plane (102V) of said first portion (102A) is at least 26.3 ± 0.1 mm.

7. The inbuilt water drain system (100) as claimed in claim 1, wherein said intermediate duct (106) includes a first portion (106A), an intermediate portion (106B) and a second portion (106C), wherein said intermediate portion (106B) angularly extends from said first portion (106A), wherein said second portion (106C) extends from said intermediate portion (106B),
wherein
said inlet (106i) of said intermediate duct (106) is defined in said first portion (106A);
said outlet (106p) of said intermediate duct (106) is defined in said second portion (106B);
said first portion (106A) of said intermediate duct (106) has an inner diameter of at least 8± 0.1 mm and an outer diameter of at least 13 mm;
said second portion (106C) of said intermediate duct (106) has an inner diameter of at least 8± 0.1 mm and an outer diameter of at least 13 mm;
a length of said first portion (106A) is at least 11± 0.2 mm;
an angle between a longitudinal axis (106BX) of said intermediate portion (106B) and a center horizontal plane (106H) of said first portion (106A) is at least 144.1 o;
a distance between said outlet (106p) and a center vertical plane (106V) of said intermediate duct (106) is at least 48± 0.2 mm;
a distance between a longitudinal axis (106CX) of said second portion (106C) and the center horizontal plane (106H) of said first portion (106A) is 16.7± 0.2 mm;
a distance between said outlet (106p) and a point of intersection of the longitudinal axis (106CX) of said second portion (106C) and the longitudinal axis (106BX) of said intermediate portion (106B) of said intermediate duct (106) is 25± 0.1 mm; and
a distance between the longitudinal axis of said second portion (106C) and said inlet (106i) of said intermediate duct (106) is at least 21 ± 0.2 mm.

8. The inbuilt water drain system (100) as claimed in claim 1, wherein said outlet duct (108) includes a first portion (108A) and a second portion (108B) transversely extending from said first portion (108A), wherein
said inlet (108i) of said outlet duct (108) is defined in said first portion (108A);
said outlet (108p) of said outlet duct (108) is defined in said second portion (108B);
a diameter of said first portion (108A) is lesser than a diameter of said second portion (108B);
said first portion (108A) of said outlet duct (108) has an inner diameter of 6 ± 0.1 mm and an outer diameter of 8.6 ± 0.1 mm;
said second portion (108B) of said outlet duct (108) has an inner diameter of 12.4 ± 0.1 mm and an outer diameter of 16 ± 0.1 mm;
a distance between a longitudinal axis (108AX) of said first portion (108A) and said outlet (108p) of said outlet duct (108) is at least 45 ± 0.1 mm; and
a distance between a longitudinal axis (108BX) of said second portion (108B) and said inlet (108i) of said outlet duct (108) is at least 25.5 ± 0.1 mm.

9. A method (200) for draining accumulated water from a water reservoir (14) in an indoor unit (12) of an air conditioner (10), said method (200) comprising:
siphoning, by ducts (102, 106, 108), the accumulated water from the water reservoir (14) to a drain pipe due to gravity on the level of the accumulated water reaching a predefined limit (GAL) in the water reservoir (14);
detecting by, a float sensor (112), a level of the accumulated water in the water reservoir (14) and sending, by the float sensor (112), one or more signals to a controller unit (110) upon the accumulated water level reaching a threshold level (FAL) in the water reservoir (14);
actuating, by the controller unit (110), a pump (104) based on the signal sent by the float sensor (112) to the controller unit (110); and
pumping, by the pump (104), the accumulated water from the water reservoir (14) to the drain pipe the ducts (102, 106, 108) upon operating the pump (104) by the controller unit (110) when the accumulated water level is reached to the threshold level (FAL) in the water reservoir (14).

10. The method (200) as claimed in claim 9, wherein said method (200) includes,
sending, by the float sensor (112), signals to the controller unit (110) upon the accumulated water level falls below the threshold level (FAL) in the water reservoir (14);
de-actuating, by the controller unit (110), the pump (104) based on the signal sent by the float sensor (112) to the controller unit (110);
siphoning, by the ducts (102, 106, 108), accumulated water from the water reservoir (14) to the drain pipe due to gravity when the accumulated water level falls below the threshold level (FAL) and reaches the predefined limit (GAL) in the water reservoir (14); and
retaining, by the duct (106), the accumulated water at least between an inlet (106i) of an intermediate duct (106) and a drain outlet (14P) of a dray tray (14T) of the water reservoir (14) when the accumulated water level falls below the predefined limit (GAL)) and reaches a drain outlet level (DOL) in the water reservoir (14) thereby preventing dry running of the pump (104) during its subsequent operation by the controller (110) on the accumulated water level reaching the threshold level (FAL),
wherein
the threshold level of the accumulated water in the water reservoir (14) is a float sensor activation level (FAL);
the float sensor (112) is mounted onto a motor cover (16) of an indoor unit (12) of the air conditioner (10) and is located in a drain tray (14T) in vicinity of a drain outlet (14P);
the predefined limit (GAL) of the accumulated water in the water reservoir (14) is a gravity activation level (GAL);
the drain outlet level (DOL) is defined at the drain outlet (14P) and is defined below the gravity activation level (GAL) in the water reservoir (14); and
at least a portion of said intermediate duct (106) is positioned a plane which is above the drain outlet (14P) of the drain tray 14).