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American Metal Ware Hot Water Boiler Page 6
Dual Level Control
Auto Refill And Low Water Cutoff System
I)
II)
Dual Level Control: What it does:
Description and Operation of Dual Level Control System:
A.
B.
C.
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
in more. 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 automatically 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 -
2. ELECTRODE ASSEMBLY -
3. METAL ENCLOSURE -
(TANK BODY)
switches power to both the thermostat and
water inlet solenoid valve by sensing changes
in water level.
consists of a high (short) and a low (extra long)
sensing electrode, or probe, molded in an epoxy
body.
provides a common (ground) connection for the
electrode circuit.
HIGH
RED WIRE
GREEN WIRE
TRANSFORMER
RELAYS
FILL HEAT
MN
120VAC
PROBES
HI XL C
PRINTED CIRCUIT
RED WIRE
HIGH
LOW
GREEN WIRE
LOW
SIDE MOUNTED PROBES
TOP MOUNTED PROBES