Sanyo SGP-M2 Manuel D'installation page 20

Procedure and Technical Points for System Installation - Hot Water Circulation
The following instruction documents are attached for the outdoor unit: "Procedures and Technical Points
for Electrical Wiring Work (Outdoors)" and "Procedures and Technical Points for Test Run." Be sure to also
refer to these documents.
Precautions on installation for hot water piping
• The permitted pressure in hot water piping in outdoor unit is 0.7 MPa.
• Install suitable water drainage valves and air extraction valves for hot water piping. Air mixing
with fl uid inside the pipes may result in noise, corrosion and reduced performance.
• Use a hot water circulation volume within the range of 2.1 m
• Operation outside this range may result in malfunction due to corrosion in the heat exchanger
and freezing in the pipe or in air residue.
• Always provide ample heat insulation work for the hot water pipes.
• Inadequate heat insulation will cause heat loss. There is also a danger of breakage in extremely
cold weather.
Install the hot water circulation pump on the hot water inlet piping side.
Ensure that the nozzle gauge for the hot water outlet piping is greater than the nozzle gauge of the
connecting piping (i.e., 20 A), and that there are as few bending portions and as little fl ow disturbance in
the piping as possible. Also, use union joints near the outdoor unit, and ensure that the unit can be easily
separated.
In the inlet piping of the outdoor unit, install a strainer (80 mesh or greater) to protect the hot water outlet
heat exchanger. Also, install valves in the outlet pipes, and before and after the strainer for maintenance
and servicing.
Fit the piping with temperature and pressure gauges. There are necessary for checking and maintenance
work.
Fit the water piping with a water temperature gauge and fl ow adjustment valve so that it is possible to
adjust the rate of hot water fl ow while reading the water temperature gauge during trial operation. Do not
touch the adjustment valve after the adjustment.
Install support fi xtures as appropriate for hot water outlet piping and ensure that the outdoor unit is not
subject to excessive loads.
Cleaning of hot water piping and air purging
Always clean the piping to remove waste and burr and also any remains of fl ux inside the piping, which
may cause deterioration of antifreeze agent and gelling.
Note
Ensure that air is thoroughly discharged. Residual air may prevent water fl ow and obstruct pipe cleaning.
Antifreeze and antirust
• Failure to use antifreeze may result in damage due to freezing around and resting of the appliance and
piping.
An antifreeze fi lling method is used to prevent freezing in the water circulation system. For prevention of
freezing and rust, always use the recommended antifreeze agent: Sanyo genuine Apollo GHP Coolant S.
Apply this antifreeze agent at a concentration of 35 to 55% in order to attain the rated performance for rust
and freezing prevention. Dilute the antifreeze using tap water.
Set the level of concentration of the antifreeze referring to a temperature 10°C below the lowest year-
round outdoor temperature.
Concentration (capacity)
Specifi c gravity (20°C)
Freezing point
Antifreeze Performance
35% 40%
1.056 1.063
-20°C -24°C
GB - 20
3 3
/h to 3.9 m /h.
45% 50%
1.071 1.078
-30°C -35°C
55%
1.085
-42°C