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VENT PIPE INSTALLATION
Warning
:
• Failure to follow the installation instructions could cause FIRE, CARBON MONOXIDE
POISONING, or DEATH.
• Never change the position of any dip switch other than No.7 & No.8.
• Unauthorized alteration and use of the unit in a wrong setting may cause material damage,
injury accident, scalding, or even death.
• Exceeding the maximum vent length is dangerous and may result in bad combustion.
• Be sure to connect the vent pipes in such a way so that no exhaust gas leaks when they are
installed in a concealed area, such as the attic.
Caution
:
• The edges of sheet metal parts may be sharp.
Always wear gloves and appropriate eye, foot, and other protections when handling these
products.
• It is recommended that experienced professionals familiar with the opration and maintenance of
heating appliances and vent / air intake system install this system.
These instructions are a guide to assist a professional installer.
• Before commencing installation, please read the installation instructions carefully.
• Failure to follow the installation instructions could cause not only the lower performance of
appliance but also property damage or personal injury.
• Different manufactures have different joint systems and adhesives.
Do not mix pipe, fitting, or joining methods from different manufacturers.
• Examine all components for shipping damage prior to installation.
Note
:
• In case D value is longer than 34 for Natural Gas, the unit shall be relocated with vent length
of less than 34'.
• In case D value is longer than 18 for Propane Gas, the unit shall be relocated with vent length
of less than 18'.
• In case vent pipe requires extension, use coaxial vent pipe and elbows and start from the vent
terminal side.
• Install the vent pipe at slight decline toward the vent terminal. (refer to page 45)
• Install the vent pipe securely by using sling fittings to support the connected parts.
• Use fittings at 5' (1.5m) intervals. Do not use wire.
• When installing extended vent pipe :
Take special precaution to stay clear of combustible surfaces.
• In case of horizontal direct vent installation, be sure to use recommended vent terminal.
• In case of horizontal direct vent installation with recommended vent terminal, connect reducer
between water heater and vent terminal.
• In case of other horizontal direct vent installation, connect reducer between pipe and vent
terminal.
• The input rating of this MPI water heater is based on sea level operation.
At higher elevations, the actual input rate may be lower than the value listed on the rating label.
• This water heater is certified for installations from sea-level to 4,500 feet above sea level.
• For installations from 4,500 feet to 7,700 feet, refer to the settings in page 40.
In case of installations for Natural Gas model, reduce Maximum Manifold Gas Pressure at 2.2".
Summary of Contents for MWH-180
Page 60: ... 58 WIRING DIAGRAM ...
Page 61: ... 59 WIRING DIAGRAM ...
