Grindmaster AMERICAN METAL WARE 87710 - Manual (Page 11)

Dual Level Control Auto Refill And Low Water Cutoff System
1. Dual Level Control: What it does:
A.
B.
C.
2. Description and Operation of the Dual Level Control System:
A.
AUTO REFILL of the water compartment to keep the tank filled with water. When
water is used, the fill valve opens automatically to let more in. The fill valve
closes when the water level reaches full.
LOW WATER CUTOFF to prevent burn out of the electric immersion heater when
there is not enough water to cover it. When low water occurs, the heat automati-
cally switches off. The heat stays off until more water is added.
A device called a DUAL LEVEL CONTROL keeps the tank filled with water and
turns off the heat when water is low by simultaneously monitoring two different
water levels.
Components
1. Dual Level Control - switches power to both the thermostat and water inlet
solenoid valve by sensing changes in water level.
2. Electrode Assembly - consists of a high (short) and a low (extra long) sensing
electrode, or probe, molded in an epoxy body.
3. Metal Enclosure (tank body)- provides a common (ground) connection for the
electrode circuit.
Page 12 American Metal Ware 87710E Coffee Urn
Green Wire
Red Wire
Side Mounted Probes Top Mounted Probes
Green Wire
Low
Red Wire
Relays
Fill Heat
Probes
HI XL C
H
120 VAC
N
Transformer
Printed Circuit
High
Low
High