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INSTALLATION INSTRUCTIONS
• Check if adjacent wall or ceiling is fire resistant and allows safe distance for fire prevention.
• This water heater is suitable for residential water (potable) heating only. Do not use this
water heater for space heating, combination space heating/domestic water heating, or
commercial water heating applications.
• MWH-180 is not suitable for use in pool or spa applications.
• Maintain proper space around the unit for proper servicing and operation. Minimum
clearances from combustible materials are listed below.
• Secure enough space so that the inspection and repairs can be done easily.
• Secure space not only in front but also under the unit.
• Install the vent terminal in a place where sufficient ventilation can be secured.
• This unit is designed to be installed indoors using the proper vent piping to exhaust
by-products of combustion to the outside environment.
Contact your dealer or MPI for proper vent kits.
• Do not install the unit over other combustion appliances such as gas cooking stove or a
range.
Oil residue and dust in the air can adhere to the burner and the heat exchanger resulting in
deformation, loss of efficiency, or damage to electronic components.
• Do not install the vent terminal near the outlets of the other appliances.
Install the air intake terminal away from the wind path as the wind may cause imperfect
combustion.
• Keep the vent terminal away from the wall or the overhangs as far as possible even if it is
noncombustible in order to prevent discoloration and staining caused by the exhaust gas.
• Do not install the unit where commercial chemicals are used.
Those chemicals are ammonia, sulfur, chloride, ethylene compound and acids which are
used at beauty shop, laundry, factory and so forth.
• Do not install the unit over food or dishes.
• Installer must install a Pressure relief valve.
Pipe pressure relief to a drain or outside environment, or within 4" of the floor.
Pipe pressure relief discharge to a drain or outside environment. (refer to page 54)
• The appliance should be located in an area where leakage from the unit or connections will
not result in damage to the area adjacent to the appliance or to lower floors of the
structure. When such locations can not be avoided, it is recommended that a suitable drain
pan, adequately drained, be installed under the appliance. The pan must not restrict
combustion airflow.
Caution
Top of heater
Back of heater
Front of heater
Sides of heater
Floor
Vent pipe
12"
0"
6"
2"
12"
0"
(30.5cm)
(0cm)
(15.2cm)
(5.1cm) [6" (15.2cm) for reading of labels.]
(30.5cm)
(0cm)
Summary of Contents for MWH-180
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Page 61: ... 59 WIRING DIAGRAM ...