PLUMBING CONNECTIONS

Plumbing connections must comply with applicable sanitary, safety and plumbing codes.

Water Supply Connection

Water must be proper hardness. Recommended water hardness is 1 grain or less. Higher hardness may cause excessive formation of lime scale. Chlorides must not exceed 50 ppm.

A water hammer arrestor (meeting ASSE-1010 Standard) should be provided (by others) in the water supply line ahead of its connection to the line strainer. The water supply line should be a 3/4" pipe.

A flowing pressure of 15 to 25 psig is required at the pressure gauge, provided. The pressure gauge may be connected to a petcock, if equipped, and should remain closed, except when the flowing pressure is being checked. If the flowing pressure exceeds 25 psig, a pressure-reducing valve (not supplied on machines without booster) must be installed in the water supply line. A pressure-reducing valve with relief bypass is furnished with machines equipped with a 14KW electric booster.

The water-pressure regulator must have a relief bypass. Failure to use the proper type of pressure regulator may result in damage to the unit.

The minimum water supply temperature per cycle time required to maintain 180°F final rinse temperature is shown at the right:

Drain Connection

Cycle

Minimum Water Supply Temperatures

With Optional Booster Heater

Without Booster Heater

 

2 Minute

140°F

180°F

4 Minute

110°F

180°F

6 Minute

80°F

180°F

A proper drain should be connected to the 2" internal threads at the "T" fitting underneath the machine. The drain can be connected on either the left or right side of the "T" fitting. The right side of the "T" fitting is plugged at the factory, allowing the drain to be connected on the left side. If it is more convenient to connect the drain on the right side, remove the plug from the right side of the "T" fitting, reinstall it on the left side and connect the drain to the right side.

GAS CONNECTION (WHEN SPECIFIED)

Check the gas data plate attached to the dishwasher or tag attached to the gas burner tubing for type of gas to be used.

Connect the gas supply to the machine.

The burner is not adjustable. If line pressure is above 7" W.C. (natural gas) or 11" W.C. (propane gas), an additional regulator valve (not supplied) must be installed in the supply line.

The burner is ignited by solid state electronic circuitry; there is no pilot light. Gas flow is regulated by the temperature control circuit via a blower and centrifugal switch system.

STEAM CONNECTION (WHEN SPECIFIED)

Machines equipped with steam injector tank heat have a steam connection (3/4" female pipe thread) located under the machine at the rear, 6" above the floor. Machines equipped with steam coil tank heat have the steam supply connection (3/4" female pipe thread) located at the rear of the wash tank, 19" above the floor, and a condensate return connection (3/4" female pipe thread), located at the rear of the wash tank, 123/8" above the floor (a bucket-type trap is furnished). For either type of steam heat, flowing steam pressure should be 15 to 25 psig (50 psig maximum). A manually operated steam control valve (supplied by others) should be installed at a convenient location ahead of the steam supply connection.

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UW50 Untensil Washer 208-240/60/3 Page 18 of 112