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whl-648 Rev. 000 Rel. 003 Date 3.6.18
10
Part 3 - Prepare the Appliance Installation
Remove all sides of the shipping crate to allow the appliance to be
moved into its installation location.
COLD WEATHER HANDLING - If the appliance has been stored in
a very cold location (BELOW 0
o
F) before installation, handle with
care until the components come to room temperature. Failure to
do so could result in damage to the appliance.
Carefully consider installation when determining appliance
location. 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.
This appliance is certied for indoor use only. DO NOT INSTALL
OUTDOORS. Outdoor installations ARE NOT covered by warranty.
Failure to install the appliance indoors could result in property
damage, severe personal injury, or death.
A. Locating the Appliance
Incorrect ambient conditions can lead to damage to the heating
system and put safe operation at risk. Ensure that the installation
location adheres to the information included in this manual. Failure
to do so could result in property damage, serious personal injury,
or death. Failure of appliance or components due to incorrect
operating conditions IS NOT covered by product warranty.
This appliance must be installed upright in the vertical position as
described in this manual. DO NOT attempt to install this appliance
in any other orientation. Doing so will result in improper appliance
operation and property damage, and could result in serious
personal injury or death.
1. Installation Area (Mechanical Room) Operating Conditions
tEnsure ambient temperatures are higher than 32
o
F / 0
o
C and
lower than 104
o
F / 40
o
C
tPrevent the air from becoming contaminated by the
products, places, and conditions listed in this manual
tAvoid continuously high levels of humidity
tNever close existing ventilation openings
tEnsure a minimum 1” clearance around hot water and
exhaust vent pipes
tNOTE: To prevent condensing in the fan, it is recommended
to avoid prolonged exposure to temperatures below 45
o
F
This appliance has a condensate disposal system that may freeze
if exposed to sustained temperatures below 32
o
F. Precautions
should be taken to protect the condensate trap and drain lines
from sustained freezing conditions.
The service life of the appliance’s exposed metallic surfaces,
such as the casing, as well as internal surfaces, such as the heat
exchanger, are directly inuenced by proximity to damp and salty
marine environments. In such areas higher concentration levels of
chlorides from sea spray coupled with relative humidity can lead
to degradation of appliance components. In these environments,
appliances must not be installed using direct vent systems which
draw outdoor air for combustion. Such appliances must be installed
using room air for combustion. Indoor air will have a much lower
relative humidity, and hence potential corrosion will be minimized.
2. Check for nearby connections to:
tSystem water piping
tVenting connections
tGas supply piping
tElectrical power
tCondensate drain
Locate the appliance where any leakage from the relief valve, related
piping, tank, or connections will not result in damage to surrounding
areas or lower oors of the building. The appliance should be located
near a oor drain or installed in a drain pan. Leakage damages ARE
NOT covered by warranty.
3. Check area around appliance. Remove any combustible materials,
gasoline, and other ammable liquids.
Failure to keep the appliance area clear and free of combustible
materials, liquids, and vapors can result in substantial property
damage, severe personal injury, or death.
4. Gas control system components must be protected from dripping
water during operation and service.
5. If the appliance is to replace an existing appliance, check for and
correct any existing system problems, such as:
tSystem leaks
tLocation that could cause the system and appliance to freeze
and leak
tIncorrectly sized expansion tank
6. Clean and ush system when reinstalling an appliance.
tCondensate Removal Pump (Part # 554200)
t2” Mesh Vent Screens (Part # 7850P-088)
tUL353 Low Water Cut-O Kit (Part # 7855P-315)
NOTE: When using an optional system sensor, pipe insulation
must be wrapped around it to improve temperature measurement
accuracy and increase overall system eciency.
Do not introduce toxic chemicals, such as antifreeze or appliance
treatments, into any piping meant for potable water purposes.
B. Leveling
In order for the condensate to properly ow out of the collection
system, the area where you locate the appliance must be level.
Location must also fully support the weight of the lled appliance.
NOTE: When installing in a zero clearance location, it may not be
possible to read or view some product labeling. It is recommended to
make note of the appliance model and serial number.
Do not connect the appliance DHW connections to any heating
systems or components that have been previously used for non-
potable applications.
Ensure that all piping and components connected to the appliance
are suitable for potable water applications.
Do not use this appliance only for space heating applications.
Circulators suitable for DHW applications must be used.
Failure to take precautions could result in property damage,
severe personal injury, or death.
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