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WATER CONNECTION
A suitable water hammer arrestor should be installed in the water line just ahead of the dishwasher.
Without Electric or Gas Booster Water Heater
The water supply line is connected to the line strainer (Fig. 1) with
3
/4" pipe. A manual shut off valve
and pipe union are required. The required incoming water supply temperature follows:
Sanitizing Mode
Fill and Final Rinse — Water Supply
Minimum Temperature Recommended Temperature
Hot Water Sanitizing 180°F
(82°C)
180°F
(82°C)
Chemical Sanitizing (Normal Duty) 120°F
(49°C)
140°F
(60°C)
Chemical Sanitizing (Light Duty) 120°F
(49°C)
140°F
(60°C)
Proper dishwasher operation requires a flowing pressure of 20 ± 5 psig at the dishwasher. If the
flowing pressure exceeds 25 psig, a pressure reducing valve (not supplied) must be installed in the
water supply line. CAUTION: The water pressure regulator must have a relief by-pass. Failure
to use the proper type of pressure regulator may result in damage to the unit.
A pressure gauge (Fig. 1) is provided for verification of proper water pressure. The water pressure
is monitored when the solenoid valve is open and water is flowing.
With Electric Booster Water Heater
The water supply line is connected to the flow control ahead of the line strainer below the booster
with
3
/4" pipe. A manual shut off valve and pipe union are required.
The water supply should have a minimum temperature of 110°F and a flowing pressure of 15 – 25
psig at the pressure gauge on top of the machine. If the flowing pressure exceeds 25 psig, a
pressure reducing valve (not supplied) must be installed in the water supply line. CAUTION: The
water pressure regulator must have a relief by-pass. Failure to use the proper type of
pressure regulator may result in damage to the unit.
Incoming water temperature below 110°F may require the wash cycle time to be extended from 40
to 60 seconds. To have the cycle time adjusted, contact your local authorized Hobart Service
Office.
When the fill / final rinse valve is on, water from the booster tank enters the dishwasher through the
final rinse arms. During the rinse cycle, this water is 180°F. Water will likely dribble out of the lower
rinse arm into the tank between cycles due to the natural expansion of water as it is being heated.
GAS TANK HEAT (When Specified)
Check the gas data plate attached to the
dishwasher or the tag attached to the incoming
gas piping for the type of gas to be used.
Connect the gas supply to the
1
/2" NPT gas
inlet at the manual gas valve. The burner is
not adjustable. The maximum flowing inlet
gas pressure must not exceed the Maximum
value in the table. If line pressure exceeds
the Maximum value in the table, an additional
regulator valve (not supplied) must be
installed in the supply line.
GAS PRESSURE SPECIFICATION
[ FLOWING GAS PRESSURE — NOT STATIC ]
Model
Type
of
Gas
BTU/HR
Inches W.C. (Water Column)
Incoming Line Pressure
Manifold
Pressure
Minimum Maximum
AM14F
AM14T
AM14TC
Natural 20,000 4.5 10.5 3.2
Propane 20,000 9.0 13.0 9.0