Mitsubishi Electric PAC-IF021B-E Manual page 56

Table of Contents

Local application factors

* This FTC3 is designed to connect Mr.Slim/Ecodan inverter outdoor unit of MITSUBISHI ELECTRIC to local systems. Please check the following when designing

the local system.

* MITSUBISHI ELECTRIC does not take any responsibility for the local system design.

Heat exchanger

(1) Withstanding pressure

Designed pressure of outdoor unit is 4.15 MPa. Following must be satisﬁ ed for burst pressure of connecting application.

Burst pressure: More than 12.45 MPa (3 times more than designed pressure)

(2) Performance

Secure the heat exchanger capacity which meets the following conditions. If the conditions are not met, it may result in malfunction caused by the protection

operation or the outdoor unit may be turned off due to the operation of protection system.

1. Evaporate temperature is more than 4 °C in max. frequency operation under

2. In case of hot water supply, condense temperature is less than 58 °C in max. frequency operation with the outside temperature 7 °C D.B./6 °C W.B.

w1. Outdoor: 35 °C D.B./24 °C W.B.

(3) Heat exchanger internal capacity

Heat exchanger internal capacity must be within the capacity range shown below. If the heat exchanger below the minimum capacity is connected, it may result

in the back ﬂ ow of liquid or the failure of the compressor.

If the heat exchanger above the maximum capacity is connected, it may result in the deﬁ ciency in performance due to lack of refrigerant or overheating of the

compressor.

Model capacity

Maximum capacity [cm³]

Minimum capacity [cm³]

(4) Contamination maintenance

1. Wash the inside of heat exchanger to keep it clean. Be sure to RINSE not to leave ﬂ ux. Do not use chlorine detergent when washing.

2. Be sure that the amount of contamination per unit cubic content of heat transfer pipe is less than the following amount.

Example) In case of [9.52 mm

Residual water: 0.6 mg/m, Residual oil: 0.5 mg/m, Solid foreign object: 1.8 mg/m

Thermistor position

Refer to 3.2. (FTC), 3.4. (FTC2), or 3.3. (FTC3).

Note

· Install the hydraulic ﬁ lter at the water inlet pipework.

· Water quality should be to European Directive 98/83 EC standards

pH value of 6.5 - 8

Calcium ≤ 100 mg/L

Chrorine ≤ 100 mg/L

Iron/Manganese ≤ 0.5 mg/L

· Refrigerant pipe diameter from outdoor unit to refrigerant-water HEX (Only for SPLIT type)

Use the pipe with same diameter size as the refrigerant pipe connection diameter of outdoor unit. (Refer to outdoor unit installation manual.)

· Ensure that there is sufﬁ cient anti-freeze chemical in the water circuit. It is recommended to use 7 : 4 anti-freeze to water ratio.

To input the abnormal signal of water pump or the abnormal lowering of water ﬂ ow amount with non-voltage contact signal makes the outdoor unit stop forcibly.

For details, refer to 3.4.1. (FTC), 3.3.1. (FTC2), or 3.4.1. (FTC3).

· The water velocity in pipes should be kept within certain limits of material to avoid erosion, corrosion and excessive noise generation.

Be aware, and take care of , that local velocities in small pipes, bends and similar obstructions can exceed the values above.

e.g.) Copper: 1.5 m/s

Warning:

· Always use water that meets the above quality requirements. Using water that does not meet these standards may result in damage to the system

pipework and heating components.

· Never use anything other than water as a medium. It may cause a ﬁ re or an explosion.

· Do not use heated or cooled water that is produced by the air to water heat pump directly for drinking or cooking, or swimming pool. There is a risk

to damage your health. There is also a risk that installing the water heat exchanger may corrode if the necessary water quality for air to water heat

pump system cannot be maintained. If you wish to use the heated or cooled water from the heated pump for these purposes, take measure such as

to the second heat exchanger within the water piping system.

C-56

1800

420

600

the cooling rated conditions.

100

125

2130

3000