Guide To Plan Local Applications - Mitsubishi Electric PAC-IF011B-E Installationshandbuch

Guide to plan local applications

* This interface 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. 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
2. Condense temperature is less than 60
3. In case of hot water supply, condense temperature is less than 58
outside temperature 7 D.B./6 W.B.
1. Indoor: 27 D.B./19 W.B.
2. Indoor: 20 D.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
e.g. When connecting to PUHZ-RP100 VHA2
Minimum capacity : 10
Maximum capacity : 30
Model capacity
Maximum capacity [ ]
Minimum 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 step 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 4~10kΩ instead of thermistor(TH1 on the terminal
block TB61).
* Auto step 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.
8
in max. frequency operation under
in max. frequency operation under
Outdoor: 35 D.B./24 W.B.
Outdoor: 7 D.B./6 W.B.
Model capacity [ ] / Maximum capacity : 30
100 =1000
100 =3000
35 50 60
1050 1500 1800
350 500 600
1
the cooling rated conditions.
2
the heating rated conditions.
in max. frequency operation with the
Model capacity [
71 100 125
2130 3000 3750
710 1000 1250
]
140 200 250
4200 6000 7500
1400 2000 2500