WHL-001 Rev. 001 Rel. 008 Date 8.23.18
8
Figure 1 - Drain Pan Dimensions and Recommended Service Clearances
C. Clearances for Service Access
NOTE:
In addition, it is recommended to provide a minimum service
clearance of 6” from the top of the water heater to allow for piping of
the T&P relief valve and top ports. Depending on the installation, this
clearance may need to be substantially greater than 6”.
NOTE:
If you do not provide the minimum clearances shown in Figure
1 it might not be possible to service the heater without removing it
from the space.
The space must be provided with combustion / ventilation air
openings correctly sized for all other appliances located in the same
space as the heater. The heater cover must be securely fastened to
prevent the heater from drawing air from the heater room. This is
particularly important if the heater is in a room with other appliances.
Failure to comply with the above warnings could result in substantial
property damage, severe personal injury, or death.
D. Residential Garage and Closet Installations
Precautions
If the heater is located in a residential garage, per ANSI Z223.1:
• Install the water heater burner and ignition devices a minimum
of 18” above the floor of the garage. This will ensure the burner
and ignition devices are well off the floor.
• When raising the water heater ensure the entire bottom and
fully filled weight of the water heater are fully supported.
• Locate or protect the water heater so it cannot be damaged by
a moving vehicle.
Check with your local Authority Having Jurisdiction for requirements
when installing the water heater in a garage or closet. Please read
the entire manual before attempting installation. Failure to properly
take factors such as venting, piping, condensate removal, and wiring
into account before installation could result in wasted time, money,
and possible property damage and personal injury.
E. Exhaust Vent and Intake Pipe
The heater is rated ANSI Z21.10.3 Category IV (pressurized vent,
likely to form condensate in the vent) and requires a special vent
system designed for pressurized venting.
NOTE: The venting options described here (and further detailed
in the Venting section, this manual) are the lone venting options
approved for this water heater. Failure to vent the water heater
in accordance with the provided venting instructions will void
the warranty.
The exhaust discharged by this water heater may be very hot.
Avoid touching or other direct contact with the exhaust gases of
the vent termination assembly. Doing so could result in severe
personal injury or death.
Do not attempt to vent this water heater by any means other than
those described in this manual. Doing so will void the warranty
and may result in severe personal injury or death.
Vents must be properly supported. Heater exhaust and intake
connections are not designed to carry heavy weight. Vent support
brackets must be within 1’ of the heater and the balance at 4’
intervals. Heater must be readily accessible for visual inspection
for first 3’ from the water heater. Failure to properly support vents
could result in property damage, severe personal injury, or death.
Failure to vent the water heater properly will result in serious
personal injury or death.
1. Direct Vent of Exhaust and Intake
If installing a direct vent option, combustion air must be drawn
from the outdoors directly into the water heater intake and exhaust
must terminate outdoors. There are three basic direct vent options
detailed in this manual: 1. Side Wall Venting, 2. Roof Venting, and 3.
Unbalanced Venting.
Be sure to locate the heater such that the exhaust vent and intake
piping can be routed through the building and properly terminated.
Different vent terminals can be used to simplify and eliminate
multiple penetrations in the building structure (see Optional
Equipment in Venting Section). The exhaust vent and intake piping
lengths, routing, and termination methods must all comply with the
methods and limits given in the Venting Section, this manual.
When installing a combustion air intake from outdoors, care must
be taken to utilize uncontaminated combustion air.
To prevent
combustion air contamination, see Table 2.
The space must be provided with correctly sized combustion/
ventilation air openings for all other appliances located in the
space with the water heater. For power venting installations using
room air for combustion, refer to the venting section, this manual,
for descriptions of confined and unconfined spaces. Do not install
the water heater in an attic. Failure to comply with these warnings
could result in substantial property damage, severe personal
injury, or death.
2. Power Venting, Indoor Combustion Air in Confined or
Unconfined Space
This heater requires fresh, uncontaminated air for safe operation
and must be installed in a mechanical room where there is adequate
combustion and ventilating air.
NOTE: To prevent combustion air
contamination, see Table 2.
Combustion air from the indoor space can be used if the space has
adequate area or when air is provided through a duct or louver
to supply sufficient combustion air based on the water heater
input. Never obstruct the supply of combustion air to the water
heater. If the water heater is installed in areas where indoor air is
