Noritz WHiC56 Service Manual page 74

* Installation Cautions
Gas Supply Piping
Because a large quantity of gas is used with these appliances, make sure to size the gas meter and
supply piping to match the maximum KW rating of the heater.
Air Supply and Vent Pipe
Before installation, note the following:
Vent pipe diameters and maximum vent length
*Refer to the installation manual for proper settings.
Make sure the installation location allows for a flue to be built that will be shorter than the maximum
allowable vent length.
* A longer vent will cause a danger of explosion.
Choose a good path for the vent pipe.
Do not penetrate the vent pipe through a fire wall.
Extend the vent pipe all the way to the outdoors.
Steam and condensed water may exit the vent pipe. Be sure to install the vent pipe so that the steam and
water droplets will not harm anything.
The condensate trap can be filled before connecting the vent pipe.
Filling the condensate trap with water
The drain trap unit can be fi lled before connecting the vent pipe.
Filling the drain trap unit before vent pipe installation.
DANGER
Please follow one of the procedures described below to ensure that the drain trap unit is fi lled with water.
1) Fill the drain trap unit by pouring approx. 850ml 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.)
Prior to initial start up, make sure that you fi ll the drain trap unit with water.
This is to prevent dangerous exhaust gases from entering the building.
Failure to fi ll the drain trap unit could result in severe personal injury or death.
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Intake
850ml
Exhaust