26
Guide to plan local applications
* This FTC is to connect Mr. Slim inverter outdoor unit of MITSUBISHI ELECTRIC to local applications. Be sure to check the following when
planning local applications.
* MITSUBISHI ELECTRIC does not take any responsibility on the local system design.
(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.
1. Evaporate temperature is more than 4
in max. frequency operation under
+
1
the cooling rated conditions.
2. In case of hot water supply, condense temperature is less than 58
in max. frequency operation with the
outside temperature 7
D.B./6
W.B.
+
1. Outdoor: 35
D.B./24
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.
Minimum capacity : 10
%
Model capacity [
)
] / Maximum capacity : 30
%
Model capacity [
)
]
e.g. When connecting to PUHZ-HRP
100
VHA
Minimum capacity : 10
%
100
=1000
)
Maximum capacity : 30
%
100
=3000
)
Maximum capacity [
)
]
Minimum capacity [
)
]
35
1050
350
50
1500
500
60
1800
600
71
2130
710
100
3000
1000
125
3750
1250
140
4200
1400
200
6000
2000
250
7500
2500
Model capacity
(4) Contamination maintenance
1. Wash the inside of heat exchanger to keep it clean. Be sure to rince 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
:
9.52mm
Residual water : 0.6
,
/
"
, Residual oil : 0.5
,
/
"
, Solid foreign object : 1.8
,
/
"
Refer to 4.2.
· Install the hydraulic filter at the water intake.
· Use the inlet water of higher than 5
˚
C and lower than 55
˚
C.
· The water in a system should be clean and with pH value of 6.5-8.0.
· The followings are the maximum values;
Calcium : 100mg/L
Chlorine : 100mg/L
Iron/manganese : 0.5mg/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.)
· Make sure to perform the frozen prevention measure for water pipe system.
The “5-6(IN3)” terminal on TB142 is for “Forced Comp. OFF” function as the EXTERNAL INPUT(Contact signal).
To input the abnormal signal of water pump or the abnormal lowering of water flow amount with non-voltage contact signal makes the outdoor
unit stop forcibly. For details, refer to 4.5.1.
· 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 : 1.5m/s
Warning
· Use clean enough water which meets water quality standards. The deterioration of water quality may result in the system breakdown
or the water leakage.
· Never use anything other than water as a medium. It may cause a fire 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. 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.
Heat exchanger
Thermistor position
Note
Summary of Contents for PUHZ-W50
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