Mitsubishi Electric PAC-IF012B Technical Manual page 13

[ 6 ] Notifi cation to design/select HEX (Refrigerant - Water)
• Specifi cations of AHU and compatibility with regulations must be confi rmed by your company.
• Selection of an appropriate AHU (with appropriate specifi cations to match those of units
connected to the AHU such as confi guration, dimension, life-span, vibration, noise level,
or features) must be made by your company.
• Mitsubishi Electric shall not be liable for any damage to the entire system or the AHU main
body caused by connected AHU with wrong specifi cation or wrong usage of AHU.
• Mitsubishi Electric shall not be liable for any damage to the outdoor units caused by AHU damage.
( AHU : hydro box or refrigerant - water HEX )
Heat exchanger
(1) Withstanding pressure
Designed pressure of outdoor unit is 4.15 MPa. Following must be satisfi ed 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 tem-
perature 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 mini-
mum capacity is connected, it may result in the back fl ow of liquid or the failure of the compressor.
If the heat exchanger above the maximum capacity is connected, it may result in the defi ciency in performance due to lack
of refrigerant or overheating of the compressor.
Minimum capacity : 10 х Model capacity [J] / Maximum capacity : 30 × Model capacity [J]
e.g. When connecting to PUHZ-HRP100 VHA2
Minimum capacity : 10 х 100 =1000 J
Maximum capacity : 30 х 100 =3000 J
Model capacity
Maximum capacity [J]
Minimum capacity [J]
(4) Contamination maintenance
1. Wash the inside of heat exchanger to keep it clean. Be sure to rinse not to leave fl ux. Do not use chlorine detergent for
wash.
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 M/C, Residual oil : 0.5 M/C, Solid foreign object : 1.8 M/C
Note:
• Install the hydraulic fi lter 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. (Water piping insulation, back-up pump
system, using of a certain % ethylene glycol instead of normal water)
[Reference]
TB142 has 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 fl ow amount with non-voltage contact
signal makes the outdoor unit stop forcibly. For details, refer to each part of I/F or FTC on this manual.
60(2.5HP) 71(3HP)
1800 2130
600 710
Warranty for SPILIT solution
100(4HP) 125(5HP)
3000
1000
13
140(6HP)
3750 4200
1250 1400