Use and Care Manual

42
Completely
insula
te the
wate
r inlet and
outlet fit
tings.
Do not cover the
water drain plug with
insulation.
The water in the pipe
can be drained.
Insulate the water supply
valve completely.
Cold water supply
• Be sure to check the water pressure.
- In order for the client to use the Water Heater
comfortably, 15 to 150 psi* (103.4 to 1034 kPa)
of pressure is needed from the water supply.
* Recommended 50 to 80 psi for maximum
performance.
- If the water pressure is low, the Water Heater
cannot perform to its full capability, and may
become a source of trouble for the client.
- If the water pressure is low, local boiling will
occur inside the Water Heater causing abnormal
sounds and decreasing the durability of the Heat
Exchanger.
- If the water pressure is too high, use a Pressure
Reducing Valve and a Water Hammer Arrester.
• Recommend installing a pressure meter on the
inlet.
• Mount a check valve (near the inlet) when
required by local code.
• Mount a shut off valve (near the inlet).
NOTE
Do not use PVC, iron, or any piping
which has been treated with
chromates, boiler seal or other
chemicals.
Hot water supply
• Try to make the piping as short as possible.
The longer the piping, the greater the heat loss.
• Use mixing valves with low water flow resistance.
• Use shower heads with low pressure loss.
• If the Maximum flow of water cannot be obtained
with the supplied water pressure and/or the
water supply pressure is below the recommended
pressure, use a pump to increase the pressure
and water flow.
• Noritz recommends the installation of a wye
pattern strainer downstream on the hot water
supply to prevent loose scale from accumulating
and clogging fixtures.
NOTE
Do not use lead, PVC, iron or any
piping which has been treated with
chromates, boiler seal or other
chemicals.
Outdoor Installation
• Freezing is prevented within the Water Heater
automatically unless the outside temperature
without wind is below -4°F (-20°C).
• If this model is installed in an area where the
outside temperature can approach freezing
conditions of -4°F (-20°C) or below, then
additional freeze protection measures must be
used.
Perform the following insulation measures for
prevention of freezing.
• Take appropriate heat insulation measures (e.g.
wrapping with heat insulation materials, using
heat tape, electric heaters, solenoids, or pipe
covers) according to the climate of the region
to prevent the plumbing external to the Water
Heater from freezing.
The freeze prevention heaters will not prevent
this plumbing from freezing.
• Make sure that there are no water leaks from the
cold and hot water supply lines, then insulate the
pipes completely.
• Be sure to also completely insulate the water
supply valve and the cold and hot water
connections on the Water Heater.
• For temporary freeze protection measures, refer
to the Owner’s Guide.
NOTE
In order for the freeze prevention
heaters to operate, the Water Heater
must connect the electrical power at
all times.
Indoor Installation
• Freezing is prevented within the Water Heater
automatically unless the outside temperature
without wind is below -30°F (-35°C).
• If this model is installed in an area where the
outside temperature can approach freezing
conditions of -30°F (-35°C) or below, then
additional freeze protection measures must be
used.
NOTE
The room temperature must be
greater than 32°F (0°C) to prevent
freezing and the room inside must not
have negative pressure.
8.1.2 Freeze Prevention
Connecting the Water Supply