Panasonic U-20GES3E5 Manual Del Usuario página 14

(3) Fuel piping work of the GHP outdoor unit
As needed, attach devices 2, 3 or 5 to the outdoor unit external fuel gas pipe. (Fig. 11-1)
1 Flexible gas hose
A main valve must be installed for servicing the fuel gas tube.
CAUTION
• Use a reinforced gas hose or a low-pressure gas hose with fuel
gas joint bracket between the fuel gas pipe master valve and the
outdoor unit. In addition, avoid excess pressure or shock to the
outdoor unit's fuel gas inlet by taking measures such as making
the pipe path leading up to the gas hose as short as possible.
Otherwise, there is danger of fire resulting from fuel gas leakage.
• If necessary, install pipe brackets in the fuel gas pipe path to
reduce the risk of pressure or shock to the pipe path. In particular,
take sufficient precautions when installing near roads. There is a
danger of fire or explosion resulting from fuel gas leakage.
* In regions with heavy snowfall, take precautions to protect the
fuel gas pipe path from snow damage (Fig. 11-2).
• After installation work is completed, check that there is no gas
leakage from the fuel gas pipe/hose path. There is danger of fire
resulting from fuel gas leakage.
• To ensure safety in case of a gas leak, make sure that airflow
surrounding the outdoor unit is sufficient and gas will not
accumulate.
Accumulation of gas may result in fire or explosion.
(4) Exhaust drain pipe work of the GHP outdoor unit
Attach the included exhaust drain hose to the exhaust drain port (Fig. 8) and follow the precautions below in
performing plumbing work.
● The exhaust drain hose comes packaged on the reverse side of the electrical box panel of the outdoor unit.
WARNING
• 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 configure the pipes (as shown in Fig. 12) so
that exhaust gases are discharged into open air. (Make sure that the opening in the receiving drain
pipe is at least 60.5 mm in nominal diameter.) Exhaust gases flowing 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 flowing into the
building or indoor/outdoor units may result in poisoning or corrosion of the unit.
CAUTION
• If installing the outdoor unit on a roof, extend the exhaust drain pipe to the water drain (as shown in Fig. 13).
PROHIBITED: Do not install the drain pipes so they drain directly onto concrete surfaces,
waterproof sheets, or metal roofing.
Doing so may result in discoloring of concrete and metal surfaces, damage to
waterproof sheets, holes, and other damage.
● Fasten the exhaust drain hose (included) with a hose clamp.
If the exhaust drain hose leaks, it may cause corrosion to the equipment.
● When installing the exhaust drain hose (included) and plumbing the exhaust drain water tube, take care that
it is not blocked from bending/smashing the exhaust drain hose.
If the exhaust drain hose is blocked, it will result in poor engine combustion and may lead to an equipment
breakdown.
2 Pressure release tap
EN - 14
3 Strainer 4 Master valve
Fig. 11-1 Fuel Pipe Structure Diagram
Fuel gas pipe
Fig. 11-2 Fuel pipe protection example
5 Pipe bracket
Protective cover