Service manual

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Installation
Filling the drain trap unit with water
The drain trap unit can be filled before connecting the vent pipe.
Filling the drain trap unit before vent pipe installation.
DANGER
Prior to initial start up, make sure that you fill the drain trap unit with water.
This is to prevent dangerous exhaust gases from entering the building.
Failure to fill the drain trap unit could result in severe personal injury or death.
Please follow one of the procedures described below to ensure that the drain trap unit is filled with water.
700ml
Intake
Exhaust
1) Fill the drain trap unit by pouring approx. 700ml of water into the
exhaust accessory on the top of the appliance as illustrated below.
Or, if the vent pipe has already been installed:
2) After installing the drain pipe, make sure that the area around the
appliance is well ventilated; open a window or a door if necessary.
Then, operate the unit and verify that condensate is coming out of the
drain pipe.
(During normal use of the water heater, condensate will begin to discharge
from the drain pipe within 30 minutes of use. However, depending on the
season and/or installation site conditions, it may take longer.)
• This product is a highly-efficient latent heat collection device and drain water is discharged from the drain
discharge port during combustion (max discharge: about 100cc/min). Be sure to perform drain piping.
• Use indirect water discharge when connecting the drain pipe from the device to a rainwater pipe. Do not install
a trap.
• Use indirect water discharge when connecting the drain pipe from the device to a sewage water pipe or other
drainage pipes and be sure to install a trap to prevent foul odors. (Take caution as there may be odor when
leaving the device unattended for a long period of time)
• The specified drain pipe size is R1/2". Do not narrow the diameter of the drain pipe in the middle.
• Use plastic pipe, such as PVC, for the drain line. Do not use steel, black iron, or any other material which can
corrode when placed into contact with water.
• Keep the drain pipe length to a minimum.
Install the pipe with a decline when horizontally
pulling the pipe in the middle.
• The end of the drain pipe must be released in to the air.
Be sure the pipe is not submerged in water. In addition,
take measures to prevent clogging of the pipe.
• After performing piping, check to make sure drain water
is properly drained. (In the case of normal hot water use,
drainage starts in about 15 minutes. However, the time
may vary depending on the season and other conditions.)
• Use tape or packing, etc. to the connection part of the
drain pipe.
Some of the seal material may damage the resin.
• Take measures to prevent the condensate drain lines from
freezing (insulation, heat tape, electric heaters, etc.).
Slope pipe
downwards 1/50.
1/2" PVC pipe
The end of the drain pipe
must have an air gap.
MAINTAIN CLEARANCE
Floor drain
(More than 30mm.)
DO NOT ADD
ANY VALVES
Condensate pipeing to floor drain
Drain pipe