Sanyo SGP-M2 Manuel D'installation page 31

(3) Exhaust drain pipe work
• If connecting the outdoor unit's exhaust drain to a covered drainage basin or gutter, or draining
multiple outdoor units to the same location, be sure to confi gure the pipes (as shown in Fig. 11) so
that exhaust gases are discharged into open air. (Make sure that the opening in the receiving drain
pipe is at least 50A in nominal diameter.) Exhaust gases fl owing into the building or indoor/outdoor
units may result in poisoning or corrosion of the unit.
• If a pipe is used for outdoor unit exhaust draining, do not use the same pipe for other purposes
(condensate draining for outdoor units, indoor unit draining, etc.). Exhaust gases fl owing into the
building or indoor/outdoor units may result in poisoning or corrosion of the unit.
• If installing the outdoor unit on a roof, extend the exhaust drain pipe to the water drain (as shown in Fig. 12).
PROHIBITED: Do not install the drain pipes so they drain directly onto concrete surfaces, waterproof
sheets, or metal roofi ng.
Doing so may result in discoloring of concrete and metal surfaces, damage to waterproof
sheets, holes, and other damage.
Slope the drain pipe at a gradient of 1/50 or more, and do not taper the pipe diameter (Fig. 11, 12). In addi-
tion, do not create any traps or peaks in the pipe.
If connecting multiple outdoor units to a single exhaust drain pipe, be sure to prevent exhaust gases from
fl owing backward by allowing the gases to discharge into open air where the drain hose enters the drain
pipe (with the drain pipe opening at least 50A in nominal diameter). Exhaust gases fl owing back into the
outdoor units while they are stopped may result in starting failures, engine stalls, corrosion of the unit, and
other problems. In addition, take measures to prevent drain water from splattering in locations where wind
is strong.
In cold regions where the exhaust drain pipe is likely to freeze, wrap heat tape or take other measures to
prevent freezing.
Use PVC or stainless steel tubing for the exhaust drain pipe.
As condensed water drips from the unit, be sure to install it in a location with good drainage. (Tubing for
the condensate drain port (Fig. 8) is not necessary, but follow the above precautions if tubing is installed.)
* Condensed water from the refrigerant tubing inside the unit is released through the condensate drain
port. Condensed water from the heat exchanger and water that gets inside the unit is released through
the drainage ports located at the center of either side panel.
Downward slope of
1/50 or more
Fig. 11 Draining the exhaust into a drainage
basin
Exhaust drain
pipe
Drainage
basin
Exhaust drain hose
Open to air
(opening at least 50A
in nominal diameter)
Downward slope of
1/50 or more
Fig. 12 Draining the exhaust into a water drain
GB - 31
Exhaust drain
pipe
Water drain
Exhaust drain hose
Open to air
(opening at least 50A
in nominal diameter)
(roof)