Water Piping Construction - Sanyo SGP-E70J2GU2 User Manual

Water heat exchange unit

(3) Water piping construction

● Only use water as the heat medium for the hot and cold water and the chilled water.
Otherwise, this could result in fires or explosions.
● Use water that complies with water standards for hot and cold water and for cooling water.
Poor quality water can cause breakdown or water leaks.
● Dispose of brine and cleaning fluid in accordance with the applicable regulations.
If these items are illegally disposed, not only will this result in legal matters, but it will also have bad effect
on the environment and health.
(1) Water pipes can be connected to either the front or the rear of the water heat exchanger unit. When shipped from the
factory, rubber stoppers are fitted to the openings. Openings that are not being used should be closed with the rubber
stopper.
(2) Connect the hot and cold water circulation pump to the inlet pipe side of the water heat exchanger.
(3) Make the opening of the water pipe larger than the opening of the connector (50A), and use as few bends as possible,
in order to reduce the pipe resistance as much as possible. Also, use unions or flanges near the unit, so that the unit
can be easily removed.
(4) Install a suitable water removal valve and air removal valve in the water pipes. If air becomes mixed with the liquid in
the pipes, this can cause noise, corrosion, and reduced performance.
(5) Make sure that there is always at least the minimum quantity of water (0.3m
small, provide a storage tank or similar). If there is insufficient water in the unit this will cause the system to stop
frequently or to breakdown.
(6) Provide a water thermometer and flow rate adjustment valve, so that during test running it is possible to adjust the
cold (hot) water flow rate while watching the water temperature. Also, after adjusting, do not touch the adjustment
valve.
(7) Adjust the water pressure so that the pressure in the water heat exchanger is less than ‚0.69N/mm
(8) Install an expansion tank within the water pipe system.
(9) The hot and cold water flow rate should be within the range shown in Figure 3. If used outside this range then it could
cause breakdown due to corrosion or freezing of the water heat exchanger unit.
(10) Provide sufficient insulation to the water pipes.
If insufficient insulation is provided then this will result in loss of heat. Also, in a severe cold period damage due to
freezing of the pipes can occur.
(11) Within the water heat exchanger unit there is a
circuit such that, if the external air temperature and
the temperature of the water within the unit fall, the
hot and cold water circulation pump automatically
starts, to prevent freezing within the water heat
exchanger unit. However, if the unit location or if
the insulation to the water pipes is insufficient, the
temperature of the water in the pump and hot and
cold water pipes might fall and freeze before the
temperature of the water in the unit falls. In this
situation provide a circuit which detects the outdoor
air temperature at the position of the whole water
circulation system where the water temperature falls
fastest, so that the hot and cold water circulation
pump can automatically start.
Attach suitable suspension fittings to the pipes, so
that no unreasonable load is applied to the water
heat exchanger unit.
Warning
Caution
Minimum necessary
flow rate
H - 20
6. Installation construction
3
) in the system. (if the water quantity is
‚2
.
Maximum allowable
flow rate
Standard flow rate
Hot and cold water flow rate (M3/h)