Champion pp-28 ユーザーガイド
20
ELECTRICAL SERVICE
ELECTRICAL SERVICE (Cont.)
Automatic Fill/Low Water Heat Protection
Dual Float Switches –
Refer to Fig. 6
Each tank contains a dual float. The device consists of
an angled stem containing two reed switches.
Two stainless steel ball floats slide over the
stem and are free to move up and down.
The floats contain magnets. When the float moves on the
stem, it opens and closes its associated reed switch inside the
stem. The reed switches control relays. The relays control the
automatic fill and heat for different parts of the machine.
Float switches and their relays operate on 24VAC.
Each tank contains a dual float. The device consists of
an angled stem containing two reed switches.
Two stainless steel ball floats slide over the
stem and are free to move up and down.
The floats contain magnets. When the float moves on the
stem, it opens and closes its associated reed switch inside the
stem. The reed switches control relays. The relays control the
automatic fill and heat for different parts of the machine.
Float switches and their relays operate on 24VAC.
Circuit Explanation –
The following is a general explanation of the float switch circuit.
Refer to the electrical schematic on your machine for a detailed description
of the individual floats, relays, and wiring.
The following is a general explanation of the float switch circuit.
Refer to the electrical schematic on your machine for a detailed description
of the individual floats, relays, and wiring.
Bottom Float and Reed Switch:
• The bottom float controls the heat.
• When the bottom float is down, the bottom reed switch contacts are open.
• When the bottom float is up, the bottom reed switch contacts close.
• The bottom float controls the heat.
• When the bottom float is down, the bottom reed switch contacts are open.
• When the bottom float is up, the bottom reed switch contacts close.
Top Float and Reed Switch:
• The top float controls a fill valve.
• When the top float is down, the top reed switch contacts are open.
• When the top float is up, the top reed switch contacts are closed.
• The top float controls a fill valve.
• When the top float is down, the top reed switch contacts are open.
• When the top float is up, the top reed switch contacts are closed.
Initial Fill –
• When the tank is completely empty, both floats are down and their reed switch contacts
• When the tank is completely empty, both floats are down and their reed switch contacts
are open.
• The control relay for the float switch is de-energized.
• The fill valve for the tank is energized and the tank begins to fill with water.
• As the water level in the tank rises, the bottom float begins to move up.
• When the bottom float is completely up, its NO reed switch contacts close.
• This prepares the heat circuit, but the heat Does Not energize at this time.
• The tank continues to fill until the top float is completely up.
• The top float’s NO reed switch contacts close. Its control relay energizes.
• The fill valve de-energizes.
• The heat circuit energizes through the float switch and the contacts of the control relay.
• The fill valve for the tank is energized and the tank begins to fill with water.
• As the water level in the tank rises, the bottom float begins to move up.
• When the bottom float is completely up, its NO reed switch contacts close.
• This prepares the heat circuit, but the heat Does Not energize at this time.
• The tank continues to fill until the top float is completely up.
• The top float’s NO reed switch contacts close. Its control relay energizes.
• The fill valve de-energizes.
• The heat circuit energizes through the float switch and the contacts of the control relay.
During Normal Operation –
• If the water level in a tank falls below the level of the top float, the top float moves down and
• If the water level in a tank falls below the level of the top float, the top float moves down and
its reed switch contacts open.
• When the water level falls below the level of the bottom float, the bottom float moves down
and its reed switch opens.
• The control relay de-energizes. The fill valve energizes and refills the tank.
• The heat circuit will de-energize until the water level in the tank raises the top float again.
• The bottom float keeps the heat circuit ready as long as the water level is above the level of the
• The heat circuit will de-energize until the water level in the tank raises the top float again.
• The bottom float keeps the heat circuit ready as long as the water level is above the level of the
bottom float.
Figure 6
Dual Float
Switch