8
Installation
Operation Indicator Lights
Green indicator lights inside the HRU control cabinet
indicate the operation state of the valves during the
set-up procedures. Refer to the set-up procedures on the
previous two pages to set the pressure reducing valves.
In addition, the green lights will indicate the operation of the
booster valves during normal operation. Refer to
the simplified logic diagram below which shows the
interaction of the timers, thermistor reader (temperature
control module) and the booster solenoid valves.
Exhaust Blowers
The HRU Exhaust Blowers operate when the dishwasher
is running.
Exhaust Blower 1: runs whenever the dishwasher pumps
and the final rinse are running.
Exhaust Blower 2: runs when only the final rinse is running.
FINAL
REHEAT
FILL
30 Sec.Timer
15 Sec.Timer
Green Indicator Lights
Thermistor
Reader
Indicator lights inside the control cabinet
indicate the operation of the valves.
Exhaust Blower
Fan 1 (Wire 11B)
Exhaust Blower
Fan 2 (Wire 17B)
Exhaust Blowers as viewed from the front of the dishwasher.
(Left-to-Right Dishwasher Operation Shown)
15 Second Timer (T1)
15 Seconds
Elapsed
Temperature
Less than
110˚F
Temperature
Greater than
110˚F
30 Second Timer (T2)
Cold Water/Final Rinse Valve
Thermistor Reader (TS)
The 15 second timer runs, then the 30 second timer runs in a alternating time cycle
Booster Temperature Thermistor Input
Controls the operation of the T1R
relay. The T1R relay powers the
COLD water valve depending
on the temperature input to
the Thermistor Reader.
The thermistor reader constantly
monitors the temperature of the
booster tank. It controls the
power to the timers through the
contacts of the T1R and T2R
relays. The operation of the
valves is dependent on the
temperature inputs to TS.
Controls the operation of the T2R
relay. The T2R relay powers the
HOT water valve depending
on the temperature input to
the Thermistor Reader.
Hot Water/Reheat Valve
Simplified HRU Cold and Hot Water Switching Logic Diagram
NOTE:
A detailed Logic Diagram is included at the
end of this manual
Summary of Contents for Eseries HRU
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Page 32: ...26 HRU Steam Booster Assembly 9 12 2 6 7 5 5 8 10 11 1 3 6 8 4 2 1 ...
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Page 41: ...35 Electrical Schematic ...
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