CLEVELAND RANGE
SEQUENCE OF OPERATIONS
Steam Coil Boiler Base
1. To turn the unit on, depress the red on/off rocker switch.
x
115 VAC is sent to the upper cabinets and terminal block in control box.
x
115 VAC is sent to normally open drain valve closing it.
x
115 VAC is sent to L1 and L2 of the water level board.
2. With the water level board energized and no water in the boiler
x
115 VAC is sent from the WF terminal to the fill solenoid.
x
The fill solenoid opens and the boiler fills through the drain valve.
x
The water fills to the low probe shorting it to ground
x
115 VAC is sent from the HTR terminal through the normally closed contacts of the
highlimit pressure switch to contacts of the ice cube relay and the amber reset switch,
energizing the amber light.
3. When the momentary amber switch is depressed 115 VAC is sent to the coil of the ice cube
relay closing it.
x
The relay latches itself through a jumper to the coil.
x
If either the high-pressure switch or the low water cut off float switch opens, the
latch circuit opens.
x
When the contacts close the amber light will energize and the process may begin
again.
x
The relay contacts close sending 115 VAC through the normally closed contacts of the
operating pressure switch to the coil of the supply steam solenoid. .
4. With 115 VAC to the coil of the supply steam solenoid.
x
The solenoid opens.
x
Steam is sent to the coil in the boiler.
5. The water in the boiler is heated to steam.
x
As steam is generated and pressure builds the air is pushed out through the steamtrap.
x
When steam goes through the steam trap and heats it to 192 degrees it closes.
6. Pressure builds in the boiler to the set point .
x
The operating pressure switch opens and the heat circuit is de-energized.
x
When the pressure drops below the set point the heat circuit is energized and the heat
process begins again.
7. Water continues to fill until the high probe is grounded.
x
When the high probe is grounded the WF terminal on the water level board is de-
energized.
x
The fill solenoid closes until the high probe is ungrounded for 05 seconds.