Chromalox CES-6 - Manual (Page 13)

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.
13
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
7 Day Clock
Control
Relay
Time Delay Relay
311 7 2 10 2 6 28
Terminal Block
Component Layout
Support
Replace with
Amp Fuse Only
Manual Drain
24 Hour Duty
Prorammed Duty
Valve Open
Valve Closed
Boiler On
Blowdown Cycle 30's
0's 80's
Cycle
Adjustment
On/Off Switch
Indicator Light
Indicator Light
Switch
PB Switch
Fuse
Valve Closed
Boiler Control
(3)
Boiler On
Ball Valve
Control
(5)
7-Day Timer
(2.3)
Exterior Side
2
w
Clock
3A
1 8
1LT
2LT
3LT
0 Valve Open
Blowdown Valve
Motorized
6
Y
B
2A
1A
2B
1B
BL
2
3
4
2
3 4
1
2 1
P
2PB
1PB
1CL
1CL
1TR
PR 1CR
G
3
B
1FU
15A
7 R
B 10
1CR
1TR
1
R
R 8
2 W
O R /
M
OBL / R 11
Wiring Diagram for Automatic Blowdown