Chromalox CES-100 Installation, Operation And Renewal Parts Identification Download Page 13

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OPERATION

AUTOMATIC BLOWDOWN INSTRUCTIONS
(IF FURNISHED)

The Automatic Blowdown is a device which automatically starts

up your boiler in the morning; shuts it down at night and blows down
(partially drains) the main boiler drain and the low water cut-off col-
umn for a predetermined time interval each working day.

The heart of the unit is an electrically operated straight through

type ball valve. It is specially designed to handle dirty, corrosive flu-
ids and particles without requiring cleaning or the use of a strainer.

Both the valve and the boiler are controlled by an electric control

unit which indicates with pilot lights when the drain valve is in the
opened or closed position and when the boiler is ON or OFF. In addi-
tion to the automatic control function, the unit has a push button which
momentarily de-energizes the boiler and opens the drain valve regard-
less of the time of day.

The unit may also be used to blow down boilers which run con-

tinuously, day and night.

INITIAL TESTING —

Set the switch marked “Programmed

duty/24 Hour duty” located on the panel box to the “ON” position.

On the large timer set the “ON” tab at about 8 AM and the “OFF”

tab at about 8 PM. Set the blowdown cycle dial at “O”.

Turn the large timer by hand until the “ON” tab passes the “TIME

NOW” indicator so the “TIME NOW” arrow indicates 10 AM.

Energize the main feed to the “LINE TERMINALS” of the unit.

The “BOILER ON” pilot light as well as the “VALVE CLOSED”
light should glow.

Hold down the “DRAIN” button for about six seconds. The

“BOILER ON” light should go out immediately as well as the
“VALVE CLOSED” light. It takes about 4 seconds for the drain valve
to open fully at which time the “DRAIN VALVE OPEN” light should
light. As soon as the “DRAIN” button is released the valve begins to
close. When it reaches the closed position, the “VALVE CLOSED”
and the “BOILER ON” should light up again.

Now turn the wheel on the large timer until the “OFF” tab passes

the “TIME NOW” arrow. The “BOILER ON” light should go out and
the valve should begin to open. Once the “VALVE OPEN” light goes
on, the valve should remain open for a few seconds and then auto-
matically close. The “VALVE CLOSED” light should light and the
“BOILER ON” light should remain off.

OPERATION—

Set the “BOILER PROGRAMMED DUTY”

switch to “BOILER ON” if the boiler is to be shut down each night.
Set it to “24-HOUR DUTY” if the boiler is to remain on continuous-
ly 24-hours per day (except during blowdown).

Set the tabs on the large timer for the ON and OFF times desired

for the boiler, screw in the small black day-skip tabs if is to remain off
during the weekend, etc.

If the boiler is on 24-hour duty, set the OFF tab for the time that is

desired for blowdown. the ON tab can be ignored, but must remain on
timer.

The small time delay relay controls the time that the drain valve

remains open. The time is controlled by adjusting knob marked
Blowdown cycle. Counterclockwise decreases, clockwise increases
blowdown time. Time must be adjusted by trial.

Boiler On

Valve Open

Valve Closed

Programmed Duty

24 Hour Duty

Manual Drain

Valve Actuator

Timer

Automatic Blowdown Control Cabinet

Display View of Automatic Blowdown Control Cabinet

Terminal Block

Support