A/C Systems in Coaches: Technical Specifications

The ability of the air conditioning unit to cool the air, measured in K.Cal/hr or TR(tons of refrigeration).

A substance used to transfer heat in an air conditioning system, e.g., Freon 22.

Hermetic or semi-hermetic compressors are used in the A/C package unit, using Freon 22 as the refrigerant.

The A/C unit requires 415V, 3-phase, 50Hz AC power.

The component of the A/C unit where the refrigerant releases heat.

The condenser coil uses copper tubes with aluminum fins.

The typical power consumption is 5.25 kW +/- 20% depending on the ambient temperature.

Each coach requires two roof-mounted A/C units with a minimum cooling capacity of 20,000 K.Cal/hr (6.6TR).

The target inside temperature is 24ºC, maintaining relative humidity (RH) below 40% in Dry and Wet summers.

Each circuit should have less than 3.0 kg of R22 refrigerant.

The condenser motor has a power of 1 horsepower (1 HP) x 2, operates at 1400 RPM ±10%, and draws 1.8 amps ±10% at 415 volts, 3-phase, 50 Hz, AC with a power factor of 0.7. It has IP 55 protection.

The evaporator unit is fin-on-tube type, with a face area of 0.265 m² (x 2).

The tubes in the evaporator are made of copper with an outer diameter of 9.62 mm (3/8") .

The evaporator fins are made of aluminum and have a thickness of 0.19 mm and 4.3 fins/cm.

The evaporator fan is a centrifugal type blower with a diameter ranging from 254 to 279 mm (10 to 11 inches).

The evaporator has an airflow of 2,000 CFM (3,400 cubic meters per hour).

The external static pressure on the evaporator is 20 mm water gauge minimum.

The evaporator motor has a power of 1.5 horsepower (HP), operates at 1400 RPM ±10%, and draws 2.2 amps ±10% at 415 volts, 3-phase, 50 Hz, AC with a power factor of 0.7. It has IP 44 protection.

The AC system must introduce at least 0.35 cubic meters per minute per person of fresh air into the compartment.

Main duct air velocity: 360 m/min max; 150 mm below duct/diffuser: 10 m/min max; 1.2 m from floor: 15 m/min max.

Devices mounted on branch ducts directing cool air towards lower berths on both longitudinal and transverse sides of the coach.

These are present on the branch diffuser for longitudinal berths, allowing control over the amount of cool air delivered.

Consist of two parts, each directing cool air towards the lower berths on the transverse sides of the coach.

The coach receives power through two sets of 415V, 3-phase, 4-wire feeders, connected using inter-vehicular couplers.

Each coach has a control panel for managing the distribution and changeover of the 415V power supply.

A 3KVA transformer converts the 415V supply to 190V for powering lights and fans.

A separate control panel/junction box inside the coach manages the distribution of 190V (110V, 1-phase) power for lights and fans.

Two sets of latched and electrically interlocked couplers at each end panel of the coach transmit power to adjacent coaches.

The water raising apparatus operates on a 240V, 1-phase, 50Hz AC supply.

A 24V, 90AH battery provides emergency lighting in case of power failure.

The air conditioning unit is designed to keep the inside of the coach cool, even in hot summer weather.

The A/C unit is designed to cool the air with a minimum capacity of 20,000 K.Cal/hr or 6.6TR (tons of refrigeration) per unit.

The compressor is the main part of the A/C unit that compresses the refrigerant to move heat.

Freon 22 or R22 is the refrigerant used in the A/C system, which absorbs heat from the inside of the coach.

The condenser is where the refrigerant releases its heat to the outside air.

The A/C system aims to maintain a comfortable inside temperature of 24°C even in hot summers, with 40% humidity or less.

The A/C unit is powered by a 415V, 3-phase, 50 Hz AC power supply.

The condenser has two propeller fans to keep it cool and help it release the heat.

The typical power consumption of the A/C unit is 5.25 kW, but it can vary by 20% depending on the temperature.

The A/C system is designed to provide at least 0.35 cubic meters of fresh air per minute per person.

The condenser motor has a power output of 1 horsepower (HP) for each of the two units, equaling 2 HP total.

The condenser motor runs at 1400 revolutions per minute (RPM), with a tolerance of ±10%.

The condenser motor draws 1.8 amps of current, with a tolerance of ±10%, at the specified voltage and frequency.

The condenser motor has an IP 55 protection rating, making it resistant to dust and water.

Each evaporator unit has a face area of 0.265 square meters.

The control panel in each coach manages the distribution and changeover of the 415V power supply, ensuring the coach receives the correct amount of power.

A separate panel inside the coach manages the distribution of 190V power for the lights and fans.

The water raising apparatus, likely a water pump, operates on a 240V, 1-phase, 50Hz AC supply.

The A/C unit keeps the inside of the coach cool and comfortable, especially in hot weather.

The compressor is the main part of the A/C system. It compresses the refrigerant, moving heat from the inside to the outside.

Freon 22 (R22) is the refrigerant used. It absorbs heat from the inside and releases it outside.

The condenser is where the refrigerant releases the heat it absorbed from inside the coach.

The A/C system aims to keep the inside temperature at a comfortable 24°C even in hot weather, with humidity below 40%.

The A/C unit needs a 415V, 3-phase, 50Hz AC power supply to operate.

The condenser has two propeller fans that help cool it down and release the heat efficiently.

The A/C unit typically consumes 5.25 kW of power, but it can vary by 20% depending on the temperature outside.

The A/C system ensures at least 0.35 cubic meters of fresh air per minute for each person.

The AC system must introduce at least 0.35 cubic meters of fresh air per minute per person into the compartment.

The coach receives power through two sets of 415V, 3-phase, 4-wire feeders, which are connected using inter-vehicular couplers. Each coach has a control panel to manage the distribution and changeover of the 415V power supply.

A 3KVA transformer converts the 415V supply to 190V for powering the lights and fans in the coach.

The water raising apparatus operates on a 240V, 1-phase, 50Hz AC supply.

This unit is used to charge the emergency lighting battery.