John Wood Takagi - 320H-520H - Manual (Page 5)

5
CAUTION
• The warranty will not cover damage
caused by water quality.
• Only potable water or potable water
/ glycol mixtures can be used with
this water heater. Do not introduce
pool or spa water, or any chemically
treated water into the water heater.
• Water hardness levels must not
exceed 7 grains per gallon (120
ppm) for single family domestic
applications or more than 4 grains
per gallon (70 ppm) for all other
types of applications. Water hard-
ness leads to scale formation and
may affect/damage the water heater.
Hard water scaling must be avoided
or controlled by proper water treat-
ment.
• Water pH levels must be between
6.5 and 8.5
• Well water must be treated.
WARNING
• Although this water heater is designed to
operate with minimal sound, the manu-
facturer does not recommend installing
the unit on a wall adjacent to a bedroom,
or a room that is intended for quiet study
or meditation, etc.
• Locate your heater close to a drain
where water leakage will not do damage
to surrounding areas. As with any water
heating appliance, the potential for leak-
age at some time in the life of the prod-
uct does exist. The manufacturer will not
be responsible for any water damage
that may occur. If you install a drain pan
under the unit, ensure that it will not
restrict the combustion air flow.
• The 520H models are high efficien-
cy products that create condensation.
A condensation drain tube must be
installed with these models to discharge
condensate into a drain outlet. For more
information, refer to pg. 15.
• The manufacturer does not recommend
installing the 520H model in an attic due
to safety issues. If you install your 520H
model in an attic:
• Make sure your unit will have
enough combustion air and proper
ventilation.
• Keep the area around you’re the
water heater clean. When dust col-
lects on the flame sensor, the water
heater will shut down on errors.
• Locate unit for easy access for ser-
vice and maintenance.
• A drain pan, or other means of pro-
tection against water damage, is
required to be installed under the
water heater in case of leaks.
General
1. Follow all local codes, or in the absence of local codes,
the most recent edition of CSA B149.1 Natural Gas,
Propane Installation Code.
2. The manifold gas pressure is preset at the factory. It is
computer controlled and should not need adjustment.
3. Maintain proper space for servicing. Install the unit so
that it can be connected or removed easily. Refer to pg.
7, and pg. 8 for proper clearances.
4. The electrical connection requires a means of disconnec-
tion, to terminate power to the water heater for servicing
and safety purposes.
5. If you will be installing the unit in a contaminated area
with a high level of dust, sand, flour, aerosols or other
contaminants/chemicals, they can become airborne and
enter and build up within the fan and burner causing
damage to the unit.
6. Particles from flour, aerosols, and other contaminants
may clog the air vent or reduce the functions of the rotat-
ing fan and cause improper burning of the gas. Regularly
ensure that the area around the unit is dust- or debris-
free; regular maintenance is recommended for these
types of environment.
7. Do not install the unit where the exhaust vent is pointing
into any opening in a building or where the noise may
disturb your neighbors. Make sure the vent termination
meets the required distance by local code from any
doorway or opening to prevent exhaust from entering a
building (refer to pg. 12).
Included Accessories
Check that the installation manual, the communication
cable, the product registration card and the PVC adaptor
are included with the unit (the adaptor comes with the 520H
model only).
Items
Manual Qty: 1
Communication Cable (Gray) Qty: 1
Product Registration Card Qty: 1
TH-PA01 PVC adaptor
(520H model only)
Qty: 1
For details on how to connect the adaptor, refer to pg.10 &.
11.