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Water Heat Exchanger Unit
(4) Water piping construction
Warning
!
Use only water as the heat-transfer medium for the hot/cold water circuits and the coolant circuits.
Use of other fl uids could result in fi re or explosion.
Caution
!
Use hot/cold water and coolants that complies with refrigeration and air-conditioning equipment water
quality guidelines (JRA-GL 02-1994)*.
Poor quality water can cause breakdown or water leaks.
Dispose of brine and cleaning fl uid in accordance with applicable local regulations.
Disposing of these items improperly may not only result in legal penalties, but may also degrade the
environment and public health.
* Refer to the reference materials for details.
1. Connect the hot/cold water circulation pump to the inlet side of the water heat exchanger.
2. The inside diameter of the water pipe should be larger than that of the connectors (50A), with as few bends
as possible in order to minimize fl ow resistance. Also, install unions or fl anges near the unit so that it can
be easily removed.
3. Install appropriate valves to enable removal of water and air from the water pipes. Noise, corrosion, and
reduced performance are likely to occur if air becomes mixed with the liquid in the pipes.
4. Make sure that the system always contains at least the minimum quantity of water (if necessary, provide
a storage tank or similar). Insuffi cient water in the unit will cause the system to stop frequently or to break
down.
5. Provide a fl ow rate adjustment valve, so that the hot/cold water fl ow rate can be adjusted while watching
the water temperature during testing. Do not touch the adjustment valve after adjusting.
6. Adjust the water pressure so that the pressure in the water heat exchanger does not exceed 0.686 MPa.
7. Include an expansion tank in the water pipe system installation.
8. The hot/cold water fl ow rate should be within the range shown in Figure 6. Operating outside this range
could cause breakdown due to corrosion or freezing of the water heat exchanger unit.
GHP Chiller TECHNICAL DATA.indb A-23
GHP Chiller TECHNICAL DATA.indb A-23
6. Installation considerations
A-23
2012/04/06 13:42:06
2012/04/06 13:42:06
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