Guide To Plan Local Applications; Heat Exchanger - Mitsubishi Electric PAC-IF021B-E Manual De Instalación

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.

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. In case of hot water supply, condense temperature is less than 58
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
e.g. When connecting to PUHZ-HRP100 VHA
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 /
Thermistor position
Refer to 4.2.
Note
· Install the hydraulic filter at the water intake.
· Use the inlet water with a temperature 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
· When connecting metal pipes made of different materials, be sure to insulate the joint to prevent electrolytic etching.
· Set up a field system so that the inlet water temperature and water flow rate can be within the allowable range specified in our technical data, etc.
If the unit is used out of the allowable range, the parts of unit might be damaged.
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.
2
in max. frequency operation under
Model capacity [ ] / Maximum capacity : 30
100 =1000
100 =3000
35 50 60
1050 1500 1800
350 500 600
1
the cooling 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