Sanyo SGP-E70J2GU2 User Manual page 125

Construction
• Cautions regarding hot water piping construction (applicable to E190J2GU2W)
● The allowable pressure of the outdoor unit hot water piping is 0.7MPa.
● Install an appropriate water or air purge valve on the hot water piping. If air gets mixed with the water flow
then this can cause noise, corrosion, and reduction of performance.
● Use a hot water circulation in the region of 2.1m
If it is used outside this range then it can cause breakdown due to corrosion or freezing of the heat exchanger,
or accumulation of air.
● Provide sufficient thermal insulation to the hot water removal pipe.
If the insulation is not sufficient it will cause heat loss, or damage due to freezing in a severe winter.
●
Install the hot water circulation pump on the inlet piping side of the hot water outlet.
●
The connector to the hot water outlet piping should be larger than (20A), and provided with as few bends as
possible to ensure low resistance. Also, by providing a union fitting near the outdoor unit for example, make it
easy to remove the outdoor unit.
●
Install a strainer (80 mesh or larger) on the inlet piping of the outdoor unit to protect the heat exchanger for
the outdoor unit outlet. Also, for ease of maintenance and servicing, install a valve on both sides of the strainer
and at the exit piping.
●
Install a thermometer and pressure gage on the piping. This is necessary for checking the operation condition
and for maintenance.
●
Install a water temperature gage and flow rate adjustment valve on the water piping, so that during test run the
flow rate can be adjusted while observing the water temperature.
●
Install an appropriate pipe support on the hot water outlet pipe, so that an excessive load is not imposed on the
outdoor unit.
●
Hot water pipe cleaning and air removal
●
Thoroughly clean the piping to remove dust and dirt, and any flux or material that can degrade the anti-freeze
and form gel compounds.
Note
Remove the air thoroughly. If there are air pockets then this can prevent water flow and pipe cleaning.
●Anti freeze and rust prevention
● If anti-freeze is not used then this can cause damage due to freezing and rusting around the unit and the
pipes.
●
The method to prevent freezing of the water circulating in the system is by adding anti-freeze. For freeze and rust
prevention, use the prescribed quantity of anti-freeze (Sanyo Genuine: Apollo GHP coolant S).
In order to obtain sufficient anti-freeze and rust prevention effect, add to 35-55% concentration.
● F
or dilution, use water complying with waterworks standards.
●
The concentration of anti-freeze should be chosen to be effective at 10
Concentration
(volume)
Specific gravity
(20
Freezing
temperature
Anti-freeze Capability Table
35%
1.056
o
C)
o
-20 C
4. Outdoor unit installation and construction
Caution
3 3
/h-3.9m /h.
Caution
o
C below the annual lowest temperature.
40% 45%
1.063 1.071
o o
-24 C -30 C
E - 38
50% 55%
1.078 1.086
o o
-35 C -42 C