Local Application Factors
* This interface is to connect Mr. Slim inverter outdoor unit of MITSUBISHI ELECTRIC to local applications. Please check the
following when designing the local system.
* MITSUBISHI ELECTRIC does not take any responsibility on the local system design.
1. 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.
1. Evaporate temperature is more than 4
in max. frequency operation under
+
1
the cooling rated conditions.
2. Condense temperature is less than 60
in max. frequency operation under
+
2
the heating rated conditions.
3. 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. Indoor: 27
D.B./19
W.B. Outdoor:
35
D.B./24
W.B.
+
2. Indoor: 20
D.B.
Outdoor:
7
D.B./6
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-RP
100
VHA2
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
,
/
"
2. Thermistor position
<Target temp.thermistor (TH1)> (Used only in *auto mode (Only for Air to Air applications))
1. Put thermistor (TH1) where average intake temperature for heat exchanger can be detected.
2. It is better to put thermistor (TH1) where radiant heat from heat exchanger can be avoided.
To use this interface for manual step control, put a fixed resistor of 4~10k
Ω
instead of thermistor (TH1 on the terminal
block TB61).
* Auto mode: In this mode, the capacity step of the outdoor unit is controlled automatically to let the target (intake)
temperature reach the setting temperature. (Only for air to air application)
<Liquid pipe thermistor(TH2)>
1. Put thermistor (TH2) where liquid refrigerant pipe temperature can be detected.
2. It is better to protect the thermistor (TH2) with heat insulating materials not to be affected by the ambient temperature, etc.
3. In case that the refrigerant is distributed by distributor, put thermistor (TH2) before the distributor.
<Cond./Eva. temp. thermistor (TH5)>
1. Put thermistor (TH5) where Cond./Eva. temperature can be detected on the indoor HEX pipe.
8
GB
