67
Local application factors
* This FTC 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 satisfied 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.
• 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.
(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 flow of liquid or the failure of the compressor.
If the heat exchanger above the maximum capacity is connected, it may result in the deficiency in performance due to lack of refrigerant or overheating of the compressor.
Outdoor unit
PUHZ-SW
40
50
75
100
—
120
160
200
SUHZ-SW
—
45
—
—
—
—
—
—
PUHZ-SHW
—
—
80
112
140
—
230
—
Maximum capacity [cm³]
1050
1500
2130
3000
3750
4200
6000
7500
Minimum capacity [cm³]
350
500
710
1000
1250
1400
2000
2500
(4) Contamination maintenance
1. Wash the inside of heat exchanger to keep it clean. Be sure to RINSE not to leave flux. 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 4.4.
Notes
· Install the hydraulic filter at the water inlet pipework.
· Inlet water temperature of heat exchanger should be within the range 5 °C - 55 °C.
· The water in both primary and sanitary circuit should be clean and with pH value of 6.5-8.0
· The followings are the maximum values;
Calcium: 100 mg/L, Ca hardness: 250 mg/L
Chrorine: 100 mg/L, Copper: 0.3 mg/L
· Other constituents should be to European Directive 98/83 EC standards.
· 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 sufficient anti-freeze chemical in the water circuit. It is recommended to use 7 : 4 anti-freeze to water ratio.
· 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 fire or an explosion.
· Do not use heated water that is produced by the air to water heat pump directly for drinking or cooking. 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 water from the heated pump for these purposes, take measure such as to the second heat exchanger within the water piping system.
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