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PLUMBING CONNECTIONS
WARNING: PLUMBING CONNECTIONS MUST COMPLY WITH APPLICABLE SANITARY,
SAFETY AND PLUMBING CODES.
WATER SUPPLY
The water supply must be within the recommended hardness range of 4 to 6 grains per gallon.
Lower hardness can cause corrosion; higher hardness can cause formation of lime scale.
The plumber who connects this machine is responsible for making certain that water lines are
THOROUGHLY FLUSHED OUT BEFORE connecting to the dishwasher. This flush-out is
necessary to remove all foreign matter, such as chips (resulting from cutting or threading of
pipes), pipe joint compound from the lines or, if soldered fittings are used, bits of solder or
cuttings from the tubing. Debris, if not removed, may lodge in the dishwasher's plumbing
components and render them inoperative. Manual valves or solenoid valves fouled by foreign
matter, and any expenses resulting from this fouling, are NOT the responsibility of the manufacturer.
WATER REQUIREMENTS
Proper water quality can improve ware washing performance by reducing spotting, lowering
chemical supply costs, enhancing effectiveness of labor and extending equipment life. Local
water conditions vary from one location to another. The recommended proper water treatment
for effective and efficient use of this equipment will also vary depending on the local water
conditions. Ask your municipal water supplier for details about local water specifics before
installation.
Recommended water hardness is 4 to 6 grains of hardness per gallon. Chlorides must not exceed
50 parts per million. Water hardness above 6 grains per gallon should be treated by a water
conditioner (water softener or in-line treatment). Water hardness below 4 grain per gallon also
requires water treatment to reduce potential corrosion. Water treatment has been shown to
reduce costs associated with machine cleaning, reduce deliming of the dishwasher, reduce
detergent usage and reduce corrosion of metallic surfaces in the booster water heater and
dishwasher.
Sediment, silica, chlorides or other dissolved solids may lead to a recommendation for particulate
filtration or reverse osmosis treatment.
If an inspection of the dishwasher or booster heater reveals lime buildup after the equipment has
been in service, in-line treatment should be considered and, if recommended, should be installed
and used as directed. Contact your local Hobart Service Office for specific recommendations.
NOTE: Iron in the water supply can cause staining. An iron filter is recommended for iron
concentration greater than 0.1 parts per million. High chloride levels in the water supply can
cause pitting. A chloride removal system is required if levels exceed 50 parts per million.
REQUIRED PLUMBING AND WATER SUPPLY CHARACTERISTICS
Model Temperature Flowing Pressure
SR24H 110°F Minimum 25 ± 3 psig
SR24C 120°F Minimum 25 ± 3 psig
DRAIN
Recommended drain height is 17" AFF or less. If drain hose is looped above a sink, the loop must
not exceed 38" AFF. A mimimum 1
1
/2" trade size drain pipe is required, reduced down to
3
/4" FPT
connection for flexible drain hose (supplied). Refer to DETAILS AND DIMENSIONS for more
information. Check for leaks.