Chromalox Boiler CHPES 6A User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation, Operation  
DIVISION  
SALES  
4
SECTION CHPES  
(Supersedes PQ436)  
and  
REFERENCE  
PQ436-1  
RENEWAL PARTS IDENTIFICATION  
161-562802-002  
DATE  
MAY, 1999  
Type CHPES-6A through CHPES-180A  
High Pressure Electric Steam Boiler  
Standard Trim is 250 PSI — 0-225 PSI Operating Pressure Range  
Boiler Serial Number . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Power Circuit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Model. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Control Circuit Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
National Board No. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Amps . . . . . . . . . . . . . . . Phase . . . . . . . . . . . Cy . . . . . . . . . .  
Important — This data file contains the National Board Registration Certificate for your boiler. It must be kept near the boiler at all times.  
3 Phase Voltages*  
Output  
Quantity/Rating  
of Contactors  
Elec  
at  
No./kW  
Heating  
Elements  
Rating Cap. Vol. 212˚F  
(BHP) (kW) (Gals.) (Lbs./Hr.)  
Model  
208  
240  
480†  
Type CHPES — 20-250 PSIG  
CHPES-6A  
CHPES-9A  
CHPES-12A 1.22  
CHPES-18A 1.73  
CHPES-24A 2.45  
0.6  
0.9  
6
6
6
6
18  
27  
36.2  
51.2  
30  
30  
40  
50  
30  
30  
30  
30  
30  
30  
1-6  
1-9  
1-12  
1-17  
2-12  
9
12  
17  
24  
6
50  
30  
14.3  
72.3 2-40  
2-30  
2-30  
1-40  
87.4  
1-40  
1-30  
1-12  
1-17  
CHPES-30A 2.95  
CHPES-36A 3.47  
CHPES-48A 4.69  
29  
34  
46  
14.3  
40  
50  
1-50  
14.3 102.5 2-50  
2-50  
2-17  
1-40  
14.3 138.7  
2-50  
1-30  
2-50  
1-40  
1-30  
1-12  
2-17  
2-50  
14.3 174.8  
2-40  
2-30  
2-50  
4-50  
6-50  
8-50  
2-12  
2-17  
4-17  
6-17  
8-17  
CHPES-60A 5.91  
CHPES-72A 6.93  
58  
68  
2-40  
14.3  
205  
307  
410  
4-50  
6-50  
2-50  
3-50  
4-50  
CHPES-100A 10.40 102 27.8  
CHPES-135A 13.9 136 30.5  
1-30  
CHPES-160A 16.1 157.5 30.5  
CHPES-180A 18.4 180 30.5  
475  
543  
7-60  
8-60  
7-22.5  
3-60  
4-60 8-22.5  
* Single phase available up to and including 24 kW capacity.  
† All boilers must have separate 120V Control Circuit or Transformer.  
Boilers under 40 Amps max are not fused.  
© 2010 Chromalox, Inc.  
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DIMENSIONS  
Type CHPES — Dimensions (In.)  
Type CHPES — Dimensions (In.)  
Model  
CHPES-6A  
CHPES-9A  
A
B*  
C
D
E
F
G
H
I
J
1
1
1
1
1
K
L
Model  
A
B*  
C
D
E
F
G
H
I
J
1
1
1
K
1
1
1
1
1
1
1
L
37 22-1/2 30 15-1/4 20 30-1/2 9-1/2 16 1/2  
1/2 1/2  
1/2 1/2  
1/2 1/2  
1/2 1/2  
CHPES-48A 43-1/2 26  
CHPES-60A 43-1/2 26  
CHPES-72A 43-1/2 26  
CHPES-100A 63-1/2 30  
CHPES-135A 63-1/2 32  
CHPES-160A 63-1/2 32  
CHPES-180A 63-1/2 32  
46 17-1/2 23 34-1/2 16-1/2 24-1/2  
46 17-1/2 23 34-1/2 16-1/2 24-1/2  
46 17-1/2 23 34-1/2 16-1/2 24-1/2  
1
1
1
3/4  
3/4  
3/4  
3/4  
3/4  
3/4  
3/4  
37 22-1/2 30 15-1/4 20 30-1/2 9-1/2 16 1/2  
CHPES-12A 37 22-1/2 30 15-1/4 20 30-1/2 9-1/2 16 1/2  
CHPES-18A 37 22-1/2 30 15-1/4 20 30-1/2 9-1/2 16 1/2  
55  
21  
27  
36 16-3/4 37-1/2 1-1/2 1-1/4  
CHPES-24A 43-1/2 26  
CHPES-30A 43-1/2 26  
46 17-1/2 23 34-1/2 16-1/2 24-1/2  
1
1
3/4  
55 20-1/2 26 37-1/2 16 37-1/2  
55 20-1/2 26 37-1/2 16 37-1/2  
55 20-1/2 26 37-1/2 16 37-1/2  
2
2
2
1-1/4  
1-1/4  
1-1/4  
46 17-1/2 23 34-1/2 16-1/2 24-1/2  
46 17-1/2 23 34-1/2 16-1/2 24-1/2  
1
1
1
1
1
1
3/4  
3/4  
CHPES-36A 43-1/2 26  
*Add two inches for transformer.  
INSTALLATION  
water line valves open at all times except during blowdown.  
WARNING: To avoid electrical shock hazard, boilers  
must be suitably grounded to earth.  
1. The boiler should be mounted on a solid level foundation. Note:  
When installing boiler, allow sufficient room (21” minimum) to  
facilitate removal of elements if and when necessary.  
2. WARNING: A minimum distance of 18” between boil-  
er and any combustible material must be maintained.  
3. Complete all piping to boiler. Connect water line to tagged fitting  
on the motor and pump assembly, if used, or to tagged fitting on  
water control feeder.  
4. When any type of feed other than a pump feed is used — the exist-  
ing water supply must be 10 pounds greater than the boiler operat-  
ing pressure to assure water supply maintains proper water level in  
boiler. Otherwise, lack of water can cause heater failure. Keep feed  
5. All water feed systems are connected to water inlet check valve.  
6. Connect steam line (with Globe valve) to boiler steam outlet.  
Valve should be placed as close as possible to boiler outlet and  
sized per label on boiler.  
7. To insure maximum efficiency of supplied kW, all piping from  
outlet should be insulated.  
8. Drain and relief valve piping should be in accordance with state  
and local codes. Floor drain to be provided directly below unit.  
9. All electrical wiring should be done by licensed electrician in  
accordance with national and local electrical codes.  
10. If pump is located less than 30 feet from boiler, a second  
check valve is required.  
Typical Plumbing Installation of a Steam Boiler with Condensate Return System  
Insulated Steam Lines  
(Pitch Down 5˚)  
Heat  
Exchanger  
Gate  
Safety  
Valve  
Water/Steam  
Separator  
Globe  
Valve  
Valve  
(Typical  
Load)  
Trap  
Trap  
Vacuum  
Breaker  
Check  
Valve  
Check  
Valve  
Check  
Valve  
Return  
Pitch Down 5˚  
Cold Water  
Make-Up  
Vent  
Boiler  
Drain  
Condensate  
Return  
Steam  
Drain  
Water  
Condensate  
Vapor  
Strainer  
Gate  
Valve  
Centrifugal  
Turbine Pump  
3
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WIRING  
damage. Industrial type lightning protectors should be installed per  
manufacturer’s recommendations at your service entrance. Check  
your contractor or electrical dealer for recommended type for your  
system.  
WARNING: Hazard of Shock. Disconnect all power  
before working on boiler. Boilers must be effectively  
grounded in accordance with the National Electrical  
Code to eliminate shock hazard.  
5. Be sure all electrical connections are sufficiently tightened.  
6. WARNING: Substitution of components or modifica-  
tion of wiring system voids the warranty and may  
lead to dangerous operating conditions.  
7. SPECIAL INSTRUCTIONS FOR CUSTOMERS SUPPLY-  
ING THEIR OWN CONDENSATE OR PUMP SYSTEMS.  
A. Check the voltage of the motor before making the wiring con-  
nection. Some Chromalox boilers are supplied with dual volt-  
age systems. The motor should always match the voltage of the  
control circuit.  
WARNING: Use 90˚copper conductors only.  
1. Select proper wire gauge and type for supply conductors in accor-  
dance with the National Electrical Code and local wiring codes fol-  
lowing wiring diagram supplied (See recommendations for dis-  
connect switches and fusing).  
2. The unit is completely wired and pre-tested before shipment. No  
internal wiring is required. Check all electrical connections for  
tightness and retighten if necessary before energizing.  
If a separate control circuit is used, the control circuit should be  
connected to the control terminal block, inside access door (not  
required with transformer).  
B. The motor circuit should be wired into the pump control as  
shown in wiring diagram (float type pump control). If boiler is  
equipped with solid state pump control, refer to wiring diagram  
and use terminals 5 and 2.  
3. Safety Switches — WARNING: Purchaser should use a  
safety switch employing circuit breakers or fuses  
between his main power source and the boiler.  
4. Because of their water lines, boilers are susceptible to lightning  
TYPICAL WIRING DIAGRAMS  
Use Applicable wiring diagrams based on model number and power voltage.  
3 Phase Voltage  
3 Phase Voltage  
3 Phase Voltage  
Boiler  
208  
1
1
1
1
240  
1
1
1
1
480  
1
1
1
1
Boiler  
208  
2
2
4
6
240  
2
2
4
6
480  
3
3
5
7
Boiler  
208  
8
240  
8
10  
12  
10  
480  
9
11  
12  
10  
CHPES-6A  
CHPES-9A  
CHPES-12A  
CHPES-18A  
CHPES-24A  
CHPES-30A  
CHPES-36A  
CHPES-48A  
CHPES-60A  
CHPES-72A  
CHPES-100A  
CHPES-135A  
CHPES-160A  
CHPES-180A  
Export  
2
2
3
6
6
7
14  
Diagram 1  
L1 L2  
L3  
1
GND  
C1  
1 HTR  
1L1  
1L2  
1L3  
FU1  
FU2  
1
GND  
FU3  
CR  
IT1  
IT2  
IT3  
10L  
20L  
30L  
Feed Water  
Motor  
2L1  
2L2  
2L3  
FU4  
FU5  
FU6  
1
Mtr  
Customer  
Connect  
FU9  
FU8  
H2  
FU7  
H1  
1PB  
FU  
2
Feed Water  
Electrical  
Connection  
Optional Transformer  
1
3
3
GND  
X1  
X2 X4  
X3  
3
GND  
2
1
2
1
B
W
2
1
FU9  
1PB  
GND  
GND  
1LT  
R
BR  
Y
On  
Off  
B
Boiler On  
IFS  
Feed Water  
CR  
1PS  
Heater  
Contactors  
2PS  
O
O
O
C1  
C2  
C3  
C4  
1
HTR  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
Wire Color Code  
Black  
B
=
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
* Boilers under 40 Amps total (not fused)  
Y
G
BL  
W
White  
4
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TYPICAL WIRING DIAGRAMS  
Diagram 2  
L1 L2  
L3  
1
GND  
C1  
1 HTR  
2 HTR  
1L1  
1L2  
1L3  
FU1  
FU2  
2
GND  
FU3  
C2  
2L1  
2L2  
2L3  
FU4  
FU5  
FU6  
CR  
IT1  
IT2  
IT3  
10L  
20L  
30L  
Feed Water  
Motor  
3L1  
3L2  
3L3  
FU7  
FU8  
1
Mtr  
FU9  
Customer  
Connect  
FU11  
H4  
FU10  
H3  
H1  
H2  
FU12  
1TB  
1PB  
Optional Transformer  
X1  
X2 X4  
X3  
3
2
1
Feed Water  
Electrical  
Connection  
2 GND  
GND  
C1  
FU  
C2  
FU  
2
1
B
FU12  
1PB  
W
4 5 6  
1 2 3  
1LT  
R
BR  
Y
On  
Off  
B
Boiler On  
IFS  
CR  
Feed Water  
1PS  
2PS  
O
O
O
C1  
C2  
Heater  
Contactors  
1
2
HTR  
HTR  
Wire Color Code  
Black  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
B
=
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
Diagram 3  
L3  
L1 L2  
1
C1  
GND  
1 HTR  
2 HTR  
1L1  
1L2  
1L3  
FU1  
FU2  
2
GND  
FU3  
2L1  
2L2  
2L3  
CR  
IT1  
IT2  
IT3  
10L  
20L  
30L  
Feed Water  
Motor  
3L1  
FU4  
FU5  
3L2  
3L3  
1
Mtr  
FU6  
Customer  
Connect  
FU7  
FU8  
H4  
H1  
H3  
X3  
H2  
FU9  
1PB  
Optional Transformer  
X1  
2 GND  
X2 X4  
3
2
1
Feed Water  
Electrical  
Connection  
GND  
C1  
FU  
2
1
B
1 2 3  
W
FU9  
1PB  
1LT  
R
BR  
Y
On  
Off  
B
Boiler On  
IFS  
Feed Water  
CR  
1PS  
2PS  
O
O
O
Heater  
Contactor  
C1  
1
2
HTR  
HTR  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
Wire Color Code  
Black  
B
=
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
* Boilers under 40 Amps total (not fused)  
White  
5
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TYPICAL WIRING DIAGRAMS  
Diagram 4  
1
L1 L2  
L3  
GND  
C1  
C3  
3 HTR  
1 HTR  
2 HTR  
1L1  
1L2  
1L3  
FU1  
FU2  
FU7  
FU8  
3L1  
3L2  
1L3  
2
GND  
FU3  
FU9  
C2  
2L1  
2L2  
2L3  
FU4  
FU5  
FU6  
CR  
IT1  
IT2  
IT3  
10L  
Feed Water  
Motor  
4L1  
4L2  
4L3  
FU10  
20L  
30L  
FU11  
FU12  
1
Mtr  
Customer  
Connect  
FU13  
H1  
FU14  
H4  
H3 H2  
Optional Transformer  
1PB  
X1  
X2 X4  
X3  
FU15  
1TB  
2
3
1
GND  
Feed Water  
Electrical  
Connection  
2
1
2 GND  
B
W
FU15  
1PB  
1LT  
R
1 GND  
BR  
Y
On  
Off  
B
Boiler On  
IFS  
C1  
C2  
C3  
FU  
CR  
C1  
Feed Water  
3
1PS  
2PS  
FU  
1 2 3  
Htr  
O
FU  
4 5 6  
O
O
Heater  
7 8 9  
Contactor  
C2  
C3  
1
2
Heater  
Contactor  
HTR  
HTR  
Wire Color Code  
Black  
B
=
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
Diagram 5  
L1 L2 L3  
1
GND  
C1  
C2  
1 HTR  
2 HTR  
1L1  
1L2  
1L3  
FU1  
FU2  
2
GND  
FU3  
2L1  
2L2  
2L3  
FU4  
FU5  
FU6  
CR  
3 HTR  
3L1  
3L2  
3L3  
IT1  
10L  
FU7  
Feed Water  
Motor  
4L1  
4L2  
4L3  
IT2  
IT3  
20L  
30L  
FU8  
FU9  
1
Mtr  
Customer  
Connect  
FU10  
H1  
FU11  
H4  
H2  
H3  
Optional Transformer  
FU12  
1TB  
1PB  
X3  
X4  
X2  
X1  
3
2
1
GND  
Feed Water  
Electrical  
Connection  
2
1
2 GND  
C2  
FU  
4 5 6  
C1  
FU  
1 2 3  
B
W
FU12  
1PB  
1LT  
R
BR  
On  
Off  
B
Boiler On  
IFS  
Y
CR  
C1  
C2  
Feed Water  
1PS  
2PS  
O
O
O
3
HTR  
Heater  
Contactors  
1
2
HTR  
HTR  
Wire Color Code  
Black  
B
=
BR = Brown  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
6
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TYPICAL WIRING DIAGRAMS  
Diagram 6  
1
L1 L2  
L3  
GND  
C1  
C3  
C4  
3 HTR  
4 HTR  
1 HTR  
2 HTR  
1L1  
1L2  
1L3  
FU1  
FU2  
FU7  
FU8  
3L1  
3L2  
1L3  
2
GND  
FU3  
FU9  
C2  
2L1  
2L2  
2L3  
FU4  
FU5  
FU10  
FU11  
4L1  
4L2  
4L3  
FU6  
FU12  
CR  
IT1  
IT2  
IT3  
10L  
Feed Water  
Motor  
5L1  
5L2  
5L3  
FU13  
20L  
30L  
FU14  
FU15  
1
Mtr  
Customer  
Connect  
FU17  
H2  
X2  
FU16  
H1  
1PB  
Optional Transformer  
FU18  
X1  
X3  
X4  
Feed Water  
Electrical  
Connection  
1TB  
2
3
1
GND  
2
1
2 GND  
B
W
FU18  
1PB  
1LT  
R
1 GND  
BR  
Y
On  
Off  
B
Boiler On  
IFS  
C1  
C2  
C4  
C3  
CR  
C1  
Feed Water  
3
Htr  
4
Htr  
FU  
10  
FU  
7 8 9  
FU  
1PS  
FU  
2PS  
O
O
O
Heater  
4 5 6  
1 2 3  
11 12  
Contactors  
C2  
C3  
1
2
HTR  
HTR  
Wire Color Code  
Black  
B
=
C4  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
1
GND  
Diagram 7  
L3  
L1 L2  
C1  
C2  
2 HTR  
4 HTR  
1 HTR  
3 HTR  
FU4  
FU5  
FU6  
1L1  
FU1  
2L1  
FU2  
FU3  
1L2  
1L3  
2L2  
2L3  
2
GND  
4L1  
4L2  
4L3  
3L1  
3L2  
3L3  
CR  
IT1  
IT2  
IT3  
10L  
FU7  
Feed Water  
Motor  
5L1  
5L2  
5L3  
20L  
FU8  
FU9  
1
Mtr  
30L  
Customer  
Connect  
FU11  
H4  
FU10  
H1  
H3  
H2  
3
GND  
FU12  
1TB  
Optional Transformer  
1PB  
X1 X3  
X2 X4  
2
3
1
Feed Water  
Electrical  
Connection  
2 GND  
C2  
GND  
C1  
2
1
FU  
FU  
B
1 2 3  
4 5 6  
W
FU12  
1PB  
1LT  
R
BR  
Y
On  
Off  
B
Boiler On  
3
4
IFS  
HTR  
HTR  
Feed Water  
CR  
1PS  
O
2PS  
O
O
Heater  
Contactors  
C1  
C2  
1
2
HTR  
HTR  
Wire Color Code  
Black  
B
=
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
7
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TYPICAL WIRING DIAGRAMS  
Diagram 8  
L2  
L1  
L3  
1
GND  
C1  
C5  
C6  
1 HTR  
1L1  
5 HTR  
6 HTR  
5L1  
5L2  
5L3  
FU13  
FU14  
FU15  
FU1  
FU2  
FU3  
2
1L2  
1L3  
GND  
C2  
C3  
C4  
2 HTR  
3 HTR  
4 HTR  
2L1  
2L2  
2L3  
FU16  
6L1  
6L2  
6L3  
FU4  
FU17  
FU18  
FU5  
FU6  
3L1  
3L2  
3L3  
FU7  
FU8  
FU9  
CR  
IT1  
4L1  
4L2  
4L3  
7L1  
7L2  
7L3  
Feed Water  
Motor  
FU10  
FU11  
FU12  
FU19  
FU20  
10L  
20L  
30L  
1
Mtr  
IT2  
IT3  
FU21  
FU22  
FU23  
Customer  
Connect  
Feed Water  
Electrical  
1PB  
1TB  
Connection  
FU24  
Optional Transformer  
X1  
X2 X4  
X3  
3
GND  
1
2
3 GND  
C1  
C3  
C2  
2
1
2
GND  
FU  
4 5 6  
FU  
1 2 3  
FU  
7 8 9  
B
W
FU24  
1PB  
1LT  
R
On  
BR  
B
Boiler  
On  
Off  
IFS  
Y
C4  
C5  
C6  
Feed Water  
5
6
CR  
C1  
C2  
C3  
HTR  
HTR  
3PS  
2PS  
1PS  
FU  
10  
FU  
13  
FU  
16  
O
O
O
Heater Contactor  
Heater Contactor  
11 12  
14 15  
17 18  
3
HTR  
4
HTR  
1
HTR  
2
HTR  
Heater Contactor  
Heater Contactor  
Heater Contactor  
Heater Contactor  
C4  
C5  
C6  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
Wire Color Code  
Black  
B
=
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
Diagram 9  
L1 L2 L3  
FU1  
FU2  
FU3  
1
GND  
C1  
1 HTR  
C3  
5 HTR  
5L1  
1L1  
1L2  
FU7  
FU8  
FU9  
2
GND  
5L2  
5L3  
1L3  
2 HTR  
3 HTR  
4 HTR  
2L1  
2L2  
6 HTR  
6L1  
6L2  
6L3  
2L3  
C2  
3L1  
3L2  
FU4  
FU5  
FU6  
3L3  
CR  
4L1  
4L2  
4L3  
IT1  
IT2  
IT3  
10L  
Feed Water  
Motor  
7L1  
7L2  
7L3  
FU10  
20L  
30L  
FU11  
FU12  
1
Mtr  
Customer  
Connect  
FU15  
FU13  
FU14  
H2 H4  
1 GND  
Feed Water  
Electrical  
1PB  
1TB  
Connection  
H1 H3  
3 GND  
Optional Transformer  
C1  
C3  
C2  
3
1
2
2
GND  
X1 X3  
X2 X4  
FU  
4 5 6  
FU  
1 2 3  
FU  
7 8 9  
GND  
1
2
B
W
FU15  
1PB  
1LT  
R
On  
BR  
Y
B
Boiler  
On  
5
6
Off  
IFS  
HTR  
HTR  
Feed Water  
CR  
3PS  
2PS  
1PS  
O
3
4
O
O
Heater Contactor  
Heater Contactor  
Heater Contactor  
C1  
C2  
C3  
HTR  
HTR  
1
HTR  
2
HTR  
Wire Color Code  
Black  
BR = Brown  
B
=
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
8
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TYPICAL WIRING DIAGRAMS  
L2  
L1  
L3  
1
GND  
Diagram 10  
C1  
C5  
1 HTR  
1L1  
5 HTR  
5L1  
5L2  
5L3  
FU1  
FU2  
FU3  
FU13  
FU14  
FU15  
2
1L2  
1L3  
GND  
C2  
C3  
C4  
C6  
C7  
C8  
2 HTR  
3 HTR  
4 HTR  
6 HTR  
7 HTR  
2L1  
2L2  
2L3  
FU4  
FU16  
6L1  
6L2  
6L3  
FU5  
FU6  
FU17  
FU18  
3L1  
3L2  
3L3  
7L1  
7L2  
5L3  
FU7  
FU8  
FU9  
FU13  
FU20  
FU21  
4L1  
4L2  
4L3  
FU10  
FU11  
FU12  
6 HTR  
8L1  
FU22  
8L2  
8L3  
FU23  
FU24  
CR  
IT1  
Feed Water  
Motor  
9L1  
9L2  
9L3  
FU25  
FU26  
10L  
20L  
30L  
1
Mtr  
IT2  
IT3  
FU27  
Customer  
Connect  
FU28  
H1 H3  
FU29  
H4  
Feed Water  
Electrical  
H2  
1PB  
1TB  
Connection  
FU30  
Optional Transformer  
3
1
2
GND  
X1  
X2 X4  
X3  
3 GND  
C8  
22  
C5  
C7  
C6  
1
2
2
B
W
GND  
16  
17 18  
13  
14 15  
19  
20 21  
FU30  
1PB  
1LT  
R
23 24  
On  
BR  
Y
B
Boiler  
On  
8
7
HTR  
HTR  
Off  
IFS  
Feed Water  
CR  
C1  
C2  
C3  
C1  
C4  
C2  
C3  
5
HTR  
6
3PS  
1PS  
O
O
O
HTR  
10  
1
2
3
4
5
6
7
8
9
11 12  
3
HTR  
4
Heater Contactor  
Heater Contactor  
HTR  
1
2
Wire Color Code  
Black  
HTR  
HTR  
C4  
C5  
B
=
BR = Brown  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
R
=
=
=
=
=
=
Red  
C6  
C7  
C8  
2PS  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
L1 L2 L3  
FU1  
FU2  
FU3  
1
Diagram 11  
GND  
C1  
1 HTR  
C3  
5 HTR  
5L1  
1L1  
1L2  
FU7  
FU8  
FU9  
2
5L2  
5L3  
GND  
1L3  
2 HTR  
3 HTR  
4 HTR  
2L1  
2L2  
6 HTR  
7 HTR  
6L1  
6L2  
6L3  
2L3  
C2  
C4  
FU4  
5L1  
3L1  
3L2  
FU10  
FU11  
FU12  
7L2  
5L3  
FU5  
FU6  
3L3  
4L1  
4L2  
4L3  
8 HTR  
8L1  
8L2  
8L3  
CR  
IT1  
Feed Water  
Motor  
9L1  
9L2  
9L3  
FU13  
FU14  
10L  
20L  
30L  
1
Mtr  
IT2  
IT3  
FU15  
Customer  
Connect  
FU17  
H4  
FU16  
FU18  
Feed Water  
Electrical  
1 GND  
1PB  
1TB  
H1 H3  
H2  
Connection  
Optional Transformer  
3 GND  
C1  
C3  
C4  
C2  
X1 X3  
X2 X4  
3
2
1
2
GND  
FU  
10  
GND  
FU  
4 5 6  
FU  
1 2 3  
FU  
7 8 9  
1
2
11 12  
B
W
7HTR  
8
FU18  
1PB  
HTR  
1LT  
On  
BR  
Y
B
Boiler  
On  
R
5
HTR  
6
HTR  
Off  
IFS  
Feed Water  
CR  
C1  
C2  
C3  
C4  
3PS  
1PS  
O
3
HTR  
4
HTR  
O
O
Heater Contactor  
Heater Contactor  
1
HTR  
2
HTR  
Wire Color Code  
Black  
B
=
2PS  
BR = Brown  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
9
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TYPICAL WIRING DIAGRAMS  
Diagram 12  
L2  
L1  
L3  
1
GND  
C1  
C5  
C6  
C7  
1 HTR  
1L1  
5 HTR  
5L1  
5L2  
5L3  
FU1  
FU2  
FU3  
FU13  
FU14  
FU15  
2
1L2  
1L3  
GND  
C2  
C3  
C4  
2 HTR  
3 HTR  
4 HTR  
6 HTR  
7 HTR  
2L1  
2L2  
2L3  
FU4  
FU16  
6L1  
6L2  
6L3  
FU5  
FU6  
FU17  
FU18  
3L1  
3L2  
3L3  
7L1  
7L2  
5L3  
FU7  
FU8  
FU9  
FU19  
FU20  
FU21  
CR  
4L1  
4L2  
4L3  
FU10  
FU11  
FU12  
IT1  
Feed Water  
Motor  
8L1  
8L2  
8L3  
FU22  
FU23  
10L  
20L  
30L  
1
Mtr  
IT2  
IT3  
FU24  
Customer  
Connect  
Feed Water  
Electrical  
FU25  
H1  
FU26  
H4  
1PB  
H2  
H3  
1TB  
Connection  
FU27  
Optional Transformer  
X3  
X1  
X4  
X2  
3 GND  
C5  
C7  
3
C6  
1
2
GND  
2
FU  
13  
FU  
16  
FU  
19  
1
2
GND  
B
W
14 15 17 18 20 21  
FU27  
1PB  
7
HTR  
1LT  
R
On  
BR  
Y
B
Boiler  
On  
C1  
C2  
C3  
FU  
8
Off  
C4  
IFS  
5
HTR  
6
Feed Water  
CR  
C1  
C2  
C3  
HTR  
FU  
2
FU  
10  
FU  
5
3PS  
1PS  
O
O
O
Heater Contactor  
Heater Contactor  
Heater Contactor  
Heater Contactor  
Heater Contactor  
Heater Contactor  
Heater Contactor  
1
3
4
6
7
9
11 12  
3
HTR  
4
HTR  
1
2
HTR  
HTR  
C4  
C5  
Wire Color Code  
Black  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
B
=
2PS  
BR = Brown  
C6  
C7  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
Diagram 13  
L2  
L1  
L3  
1
GND  
C1  
C2  
C3  
C4  
1 HTR  
5 HTR  
1L1  
5L1  
5L2  
5L3  
FU1  
FU2  
FU3  
FU7  
FU8  
FU9  
2
1L2  
1L3  
GND  
2 HTR  
3 HTR  
4 HTR  
6 HTR  
7 HTR  
2L1  
2L2  
2L3  
6L1  
6L2  
6L3  
3L1  
3L2  
3L3  
FU4  
FU5  
FU6  
7L1  
7L2  
5L3  
FU10  
FU11  
FU12  
4L1  
4L2  
4L3  
CR  
IT1  
Feed Water  
Motor  
8L1  
8L2  
8L3  
FU13  
FU14  
10L  
20L  
30L  
1
Mtr  
IT2  
IT3  
FU15  
Customer  
Connect  
Feed Water  
Electrical  
1PB  
1TB  
Connection  
FU16  
H1  
FU17  
H4  
FU18  
H2  
X3  
H3  
3 GND  
Optional Transformer  
C1  
C2  
C3  
C4  
X1  
X4  
X2  
2
3
1
2
FU  
10  
FU  
5
GND  
GND  
FU  
2
FU  
8
1
4
6
2
1
3
7
9
11 12  
B
7
HTR  
W
FU18  
1PB  
1LT  
R
On  
BR  
Y
B
Boiler  
On  
5
HTR  
6
HTR  
Off  
IFS  
Feed Water  
CR  
C1  
C2  
C3  
3PS  
2PS  
3
HTR  
4
HTR  
1PS  
O
O
O
Heater Contactor  
Heater Contactor  
Heater Contactor  
Heater Contactor  
1
HTR  
2
HTR  
Wire Color Code  
Black  
B
=
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
C4  
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Y
G
BL  
W
White  
10  
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TYPICAL WIRING DIAGRAMS  
Diagram 14  
346V 3Ø 50 HZ  
L2  
1
L1  
L3  
GND  
C1  
C3  
C4  
1 HTR  
1L1  
3 HTR  
4 HTR  
3L1  
3L2  
3L3  
FU1  
FU2  
FU3  
FU7  
FU8  
FU9  
2
1L2  
1L3  
GND  
C2  
2 HTR  
2L1  
2L2  
2L3  
4L1  
4L2  
4L3  
FU4  
FU5  
FU6  
FU10  
FU11  
FU12  
Feed Water  
Electrical  
CR  
IT1  
Feed Water  
Motor  
5L1  
5L2  
5L3  
FU13  
FU14  
10L  
20L  
30L  
3
1PB  
Connection  
1
Mtr  
GND  
FU16  
IT2  
IT3  
1TB  
FU15  
1CR  
Customer  
Connect  
C1  
C2  
C3  
C4  
2
GND  
1
FU  
10  
FU  
5
GND  
FU  
2
FU  
8
4
6
1
3
7
9
11 12  
220 VAC Single Phase Control Circuit  
3
GND  
3
4
1
2
HTR  
HTR  
B
W
FU16  
1PB  
1LT  
R
1
1
HTR  
2
HTR  
On  
BR  
Y
B
Boiler  
On  
Off  
IFS  
9.9  
CR  
2PS  
1PS  
Cabinet Exterior Left Side  
Panel Layout  
Cabinet Exterior Right Side  
O
O
C1  
C2  
C3  
Heater Contactor  
Heater Contactor  
Heater Contactor  
Heater Contactor  
Wire Color Code  
Black  
C4  
B
=
BR = Brown  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
1CR-1  
1CR-2  
Customer Pump  
Connection  
B
W
Y
G
BL  
W
White  
PRE-OPERATION CHECK  
After proper wiring and piping of boiler system is complete, testing of  
controls can start. Before testing controls, it is recommended that  
all contactor fusing be removed. This is to prevent possible element  
failure under test conditions.  
A. OPERATING AND TESTING THE McDONNELL &  
MILLER LOW WATER CUTOFF CONTROL.  
1. Be sure all valves from incoming water supply are fully open.  
Turn boiler switch to “ON” position, pump or solenoid  
valve will energize, allowing boiler to fill with water. Proper  
water level is automatically reached with level control sup-  
plied. Pump or solenoid feed will shut off at proper water level.  
Contactor(s) will energize, supplying power voltage to ele-  
ments.  
WARNING: Be sure all electrical connections are tight  
before energizing boiler. Reset all manual reset con-  
trols by pushing reset buttons on: (1) high limit control  
located on top of boiler and (2) McDonnell & Miller  
located on the side of boiler.  
Cut-off  
and  
Alarm  
Pump  
Switch  
Low-Water  
Cut-Off  
Terminals  
2. Checking operation of pump switch. (Figure 1) With water  
level visible in sight glass, partially open drain valve at bottom  
of boiler. If automatic blowdown supplied, push manual blow-  
down switch until valve open light is on, hold for few seconds.  
Water level will fall, allowing float to trip pump switch to  
“ON” position. Close drain valve or release manual blowdown  
switch.  
Adjusting  
Screws  
Alarm  
Circuit  
Terminals  
Pump  
Circuit  
Pump motor or solenoid valve will energize and water level  
will resume to normal level in sight glass.  
Terminals  
3. Checking low water cutout switch operation, open drain  
valve completely. If automatic blowdown supplied, push in  
and hold manual blowdown switch until water level falls  
enough to trip cutout switch. Close drain valve or release man-  
ual blowdown switch. If low water cutout is automatic reset,  
pump or solenoid will return water level to normal. If low  
water cutout is manual reset, then manual reset button on  
McDonnell & Miller low water cutoff control must be pushed  
to complete circuit. Turn off boiler. Reinstall contactor  
fuses.  
Pump  
Switch  
Line  
Figure 1 — Automatic Reset Low-Water Cutoff Junction Box  
11  
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OPERATION  
B. ADJUSTING OPERATING PRESSURE CONTROLS  
allow pressure to build up. When pressure gauge reading approaches  
set point of pressure control, the switch will trip and shut off boiler.  
Turn off boiler.  
To reset pressure control, bleed off enough pressure in the boiler by  
opening steam outlet drain, or blowdown valve to allow the operating  
control to reset.  
4. HIGH LIMIT PRESSURE CONTROL OPERATION  
The high limit is tested in the same manner but with the operating  
control set above the pressure setting of the high limit. (Figure 3)  
1. Chromalox boilers are supplied with operating and high limit pres-  
sure controls. One is used for controlling the operating pressure of  
the boiler while the other is used as a high limit control. To deter-  
mine the difference in the controls, the high limit has a manual reset  
lever on top of the case. Also, there is no differential scale present.  
2. On all controls, the pressure adjusting screw on the top of the case  
sets the desired pressure. Turning the screw counterclockwise  
reduces the pressure setting (CUT OUT) (See Figure 2). High limit  
control should be set at 10 psig above the operating pressure of the  
boiler.  
CAUTION: THIS IS FOR TEST PURPOSES ONLY!  
When the high limit trips, turn off boiler and reset high limit to  
proper setting. The manual reset level must be pushed to resume  
operation upon startup.  
3. The differential adjusting screw on the operating control is set in the  
same manner as the pressure adjusting screw. The CUT OUT set-  
ting minus the differential setting, equals CUT IN pressure of the  
operating control.  
Pressure  
Adjusting  
Screw  
Pressure  
Manual  
Adjusting  
Reset  
Differential  
Adjusting Screw  
Mercury  
Switch  
Screw  
Mercury  
Switch  
Lever  
Scaleplates  
Scaleplates  
Differential  
Setting  
Indicator  
Pressure  
Setting  
Indicator  
Pressure  
Setting  
Indicator  
Operating  
Lever  
Index  
Mark  
Index  
Mark  
Pointer  
Operating  
Lever  
Diaphragm  
Assembly  
Pointer  
Leveling  
Indicator  
Leveling  
Indicator  
Diaphragm  
Assembly  
Figure 2 — Pressure Control  
To check operation of the controls, close steam outlet valve and adjust  
operating pressure control to a low pressure setting. Also, set high limit  
control at 10 psig above operating pressure control. Turn on boiler, and  
Figure 3 — Hi Limit Control  
OPERATION  
RECOMMENDED START-UP PROCEDURES  
than mineral content, take this into consideration in determining  
which schedule is to be followed.  
1. At end of the working day, while boiler is still operating, turn  
switch to the OFF position and close water supply valve. De-ener-  
gize wall mounted safety switch.  
1. Close globe valve on steam outlet side of boiler. (Customer Supplied)  
2. Turn on boiler and allow pressure to build up to operating pressure.  
3. Only open globe valve at quarter turns at first, introducing smaller  
amounts of steam into process. Avoid opening globe valve all at  
once. This will eliminate the possibility of evacuating the boiler of  
water caused by the suddenly increased boiling of the water in the  
vessel as the pressure is reduced. On boilers where constant pres-  
sure is not maintained, globe valve should be kept partially closed.  
This will maintain a constant head on the boiler and stabilize any  
fluctuation in boiler water level.  
2. If blowing-down into a receptacle, allow pressure to decrease to  
15-20 psi before opening blowdown valve.  
3. It is preferable to connect the blowdown valve directly into a  
drainage system. If this is done, the boiler can be discharged at  
operating pressure.  
4. When discharge is complete and boiler is drained — (a) close the  
blowdown valve; (b) open water supply valve; (c) put boiler switch  
in the ON position; and, (d) close wall mounted safety switch.  
5. When refilling is complete, turn off the boiler switch unless further  
operation is desirable.  
6. If you have been supplied with a Manual Reset Low Water control  
as required in some states, the reset button on the control must be  
pushed before boiler will begin developing pressure. (Do not push  
reset until boiler has filled with water.)  
Note: For best boiler performance, a 1/4” less steam valve  
than size of safety valve should be plumbed as close as practi-  
cable to steam outlet. Where 1/2” safety valve is used on boil-  
er, a 1/4” steam valve is recommended.  
MANUAL BLOWDOWN INSTRUCTIONS  
Blowdown is an essential part of boiler operation. It is the best  
preventative maintenance you can give your boiler and will add  
years of life to the unit. Make sure a blowdown schedule is estab-  
lished and followed regularly.  
The use of chemical boiler cleaning compounds in these boilers  
voids all warranties unless approved by manufacturer. Some com-  
pounds will damage copper sheathed heating elements to shorten  
useful life.  
In extremely hard water areas, blowdown is necessary once a  
day. In soft water areas, once each week. If there is a particular  
problem which applies to your own local water condition other  
12  
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OPERATION  
AUTOMATIC BLOWDOWN INSTRUCTIONS  
OPERATION— Set the “BOILER PROGRAMMED DUTY”  
(IF FURNISHED)  
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).  
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.  
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. Tzhe 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.  
Timer  
Boiler On  
Valve Open  
Valve Closed  
Programmed Duty  
24 Hour Duty  
Manual Drain  
Automatic Blowdown Control Cabinet  
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”.  
Valve Actuator  
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.  
Display View of Automatic Blowdown Control Cabinet  
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.  
Blowdown Cycle  
30's  
Cycle  
Adjustment  
80's  
0's  
Boiler On  
Valve Closed  
Valve Open  
On/Off Switch  
Indicator Light  
Indicator Light  
Terminal Block  
7 Day Clock  
Support  
2
3
1FU  
15A  
w
Clock  
Prorammed Duty  
24 Hour Duty  
3
A
B
1
7-Day Timer  
Switch  
PB Switch  
Fuse  
Control  
Relay  
(2.3)  
1
1CL  
1CL  
8
1
2
4
G
Ball Valve  
Control  
(5)  
Boiler On  
1TR  
Time Delay Relay  
1PB  
1LT  
R
1CR  
3
B
PR  
P
6
Manual Drain  
1
4
2
2
Y
3
2
6
2
10  
Terminal Block  
Component Layout  
2
7
11  
8
1CR  
Boiler Control  
(3)  
Replace with  
Motorized  
Amp Fuse Only  
2PB  
2LT  
R
1TR  
2B  
2A  
O
8
7
R
B
/
R
Valve Closed  
Exterior Side  
3
Blowdown Valve  
Valve Open  
M
W
2
3LT  
R
0
BL  
O
11  
10  
/
BL  
1A  
1B  
Wiring Diagram for Automatic Blowdown  
13  
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OPTIONAL EQUIPMENT FOR STEAM BOILERS  
AUXILIARY LOW WATER CUTOFF  
Operation  
Operation of this control is accomplished by sensing a minute AC  
current flowing between submerged contact probe in the boiler shell.  
When this minute AC current is conducted through an external cir-  
cuit resistance up to 40,000 ohms or less, a signal of sufficient magni-  
tude is present to trigger the SCR and, in turn energize the control  
relay.  
the motor runs, the wiper on the feedback potentiometer moves in a  
direction to balance the circuit. When the circuit is again in balance, the  
balancing relay contacts open and the motor stops.  
Similarly if the pressure of the controlled medium falls, the wiper on  
the controller potentiometer moves toward B, and the “open” contacts  
in the balancing relay make. The motor drives towards its open position  
until circuit balance is achieved.  
The slightest change in the pressure of the controlled medium will  
cause a change in the number of elements energized to compensate for  
it, thus keeping the pressure constant. This process is called modulation.  
PROPORTIONAL PRESSURE CONTROL ONLY SUPPLIED  
WITH SEQUENCER  
As the water level in the boiler drops below the level of the probe,  
the AC current is broken and the control relay is de-energized. The  
control will not energize until sufficient water is present in the boiler.  
Specifications  
Input Supply — 120 vac/50-60 hz  
Main Setting — Turn the adjustment screw until the indicator is  
opposite the low point of the desired throttling range. That is, if the pres-  
sure is to be held at a minimum of 50 psi, set the indicator at 50 psi. The  
pressure will them be maintained between 50 psi and a higher pressure  
equal to the 50 psi plus the throttling range.  
Detectable Range — 100,000 ohms  
Probe Voltage — 24 Vac  
Probe Current — 10 milliamps  
Control Relay — Single pole double throw  
WARNING: Control will not work with de-ionized or  
THROTTLING RANGE SETTING L91B  
demineralized water.  
After setting the indicator for the minimum pressure, turn the throt-  
tling range adjustment screw until the throttling range indicator points to  
the desired throttling range on the scale. This scale is graduated from  
“min” to “F”. The value of each division varies with the scale range of  
the instrument.  
Typical Wiring for  
Auxiliary Low Water Cutoff  
Electronic Resistance Sensing  
Amplifier for Auxiliary  
Low Water Cutoff  
PRESSURE  
SCALE RATING  
0-15 psi  
VALUE EACH  
DIVISION ON SCALE  
2.2 psi  
20-300 psi  
16.4 psi  
480V  
3
1
60 HZ  
L2  
Pressure scale rating will vary depending on pressure control supplied.  
CHECKOUT  
GND  
L1  
L3  
C1  
FU  
FU  
FU  
1 HTR  
After the controller has been installed, wired, and set, it should be  
tested with the system in operation. First allow the system to stabilize.  
Then observe the operation of the controller while raising and lowering  
its set point. Pressure should increase when the set point is raised and  
decrease when the set point is lowered. Use accurate pressure testing  
equipment when checking out the controller. Do not rely on inexpensive  
gauges. The controllers are carefully calibrated at the factory.  
If the motor or actuator runs the proper direction when the set point  
is adjusted, it can be assumed that the controller is operating properly. If  
it runs in the wrong direction, reverse the B and W wires. Observe the  
action of the motor to see if it stabilizes. If the motor is moving con-  
stantly, widen the proportioning range a little at a time, until the system  
is stable.  
2
GND  
Fuses Supplied  
on Boilers Rated  
Over 40 Amps.  
FU2  
FU1  
H1 H3 H2 H4  
480V/120V  
1.5 KVA  
1
2
3
X3  
X2 X4  
X1  
GND  
2
1
B
FU3  
W
1LT  
R
1PB On  
BR  
B
Boiler On  
Off  
W
W
3
2
2
2
2
3
6
Auto  
Blow  
Down  
6
System  
1PS  
Y
Feed Water  
(Solenoid Pump)  
1PS  
O
O
W
L1 L2  
O
2PS  
BL  
Heater  
Contactor  
BL  
C1  
H
NO  
C
C1  
Adjusting Screw  
R
Differential Adjusting Screw  
LWCO Probe  
Aux. Low  
Water Cutoff  
PROPORTIONING PRESSURE CONTROL FOR  
SEQUENCER AND SCR CONTROLS  
Typical Operation  
Pressure variations cause the bellows to expand or contract.  
Linkage between the bellows and the potentiometer wiper causes the  
wiper to move across the windings on the potentiometer. This varies  
the resistance between R and B, and between R and W, causing an  
unbalance in the circuit connected to the controller.  
R
A proportioning pressure control is used to regulate a motor driven  
or solid state sequencer. The controller potentiometer, the feedback  
potentiometer in the motor and a balancing relay in the motor form an  
electric bridge circuit. As long as the pressure of the controlled medi-  
um remains at the set point of the controller, the circuit is balanced;  
i.e., equal currents flow through both sides of the balancing relay and  
the relay contacts are open. When the circuit is balanced, the motor  
does not run.  
W
B
If the pressure of the controlled medium rises, the wiper in the con-  
troller moves toward W. This unbalances the circuit so a larger current  
flows through one side of the balancing relay. The “close” contacts in  
the relay make, causing the motor to drive toward its closed position. As  
(L91B) Proportioning Pressure Control used with Sequencer Control  
14  
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OPTIONAL EQUIPMENT FOR STEAM BOILERS  
IF A CONTROLLER SEEMS TO OPERATE IMPROPERLY  
If the controller is suspected of operating improperly, it may be  
further checked as follows:  
1. Leave the controller installed where it is, but disconnect all power  
to the boiler.  
2. Loosen the cover screw below the main scaleplate and remove the  
cover.  
3. Disconnect the wires from the controller.  
4. Connect an ohmmeter between controller terminals B and W to  
measure the resistance of the potentiometer in the controller. The  
ohmmeter should read about 135 ohms on an L91B.  
5. Connect the ohmmeter between controller terminals W and R and  
raise the set point of the controller above the actual pressure being  
measured. The ohmmeter should read the full value of the poten-  
tiometer measured in step 4 (135 ohms for an L91B).  
6. Slowly lower the set point of the controller while observing the  
ohmmeter reading. The resistance should drop to zero at some set  
point below the actual pressure.  
Sequencer (5-Step)  
7. An approximation of the proportioning range can be made by  
observing the change in set point required for a resistance change  
from zero to full value.  
8. When the controller is operating properly, reconnect the wires,  
replace the cover, tighten the cover screw, and reset the controller  
to the desired value.  
TESTING OPERATION OF SEQUENCER  
1. With boiler off, remove wiring from pressure control on  
sequencer low voltage terminal board.  
2. Turn on boiler to supply the voltage to the sequencer. Short ter-  
minal R and B for counterclockwise rotation and terminal R and  
W for clockwise rotation.  
9. Reconnect power to the controlled motor.  
3. If sequencer operates under this test procedure, but when rewired  
to pressure controller and does not function, check pressure con-  
trol. Note that wiring is W-B and B-W-R-R between sequencer  
and pressure controller  
Main Scale  
Adjusting  
Screw  
Proportioning Range  
Adjusting Screw  
BOILER SEQUENCE — SOLID STATE  
Solid State Progressive Sequencer  
The solid state progressive sequencer provides accurate elec-  
tronic control of multi-stage loads of the type used in Chromalox  
steam boilers. It features progressive sequencing (first on-first off)  
which equalizes the operating time of each load. This control gives  
visual indication of each energized stage by means of integral solid  
state light emitting diodes. In the event of power interruption, all  
heating elements are immediately de-energized for safety. When  
power resumes, the control will restage the loads one at a time.  
The solid state sequencer operates on 120V AC/60 Hz and each  
output is relay switched with a load rating of 125 VA at 120V AC.  
The input to the sequencer is a 0-135 OHM potentiometer sup-  
plied on the operating pressure control. The sequencer has a sensi-  
tivity control which is adjustable from min. to max. This sensitivity  
control defines the amount of resistance (pressure) deviation  
allowed before adding or subtracting a load. Potentiometer resis-  
tance should decrease with increasing pressure. Connections are  
made to red and white terminals of proportional pressure control.  
See Wiring Diagram 337-300164-452 for Boiler With Solid State  
Sequencer.  
R
W
B
Main Scale  
Setting  
Indicator  
Set Point  
Increase  
Ohmmeter  
B
R
W
Increases to  
135 Ohms  
Terminals are not Labeled, but Screw-Heads are  
Color Coded Red (R), White (W) and Blue (B).  
BOILER SEQUENCER (5 STEP) MOTOR DRIVEN  
RECYCLE FEATURE  
The step control is designed to drop out all contactors when con-  
trol circuit is interrupted. On resumption of power, the camshaft  
rotates to the counterclockwise (ccw) limit, opening all the load  
switches. The recycle relay then energizes, pulling in the load con-  
tact, and finally the camshaft rotates clockwise (cw) to the position  
called for by the pressure controller energizing, in sequence, the  
required load stages.  
Solid State Sequencer  
15  
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OPTIONAL EQUIPMENT FOR STEAM BOILERS  
480V 3Ø 60 HZ  
L1 L2 L3  
Feed Water  
Motor  
CR  
IT1  
IT2  
IT3  
10L  
20L  
30L  
1
Mtr  
Optional Transformer  
Customer  
Connect  
W
Boiler  
On  
Auto  
Blowdown  
System  
Feed Water  
CR  
Sequencer  
Solenoid Valve  
Wire Color Code  
Black  
B
=
BR = Brown  
Pressure  
Control  
Heater Contactor  
R
=
=
=
=
=
=
Red  
O
Orange  
Yellow  
Green  
Blue  
Heater Contactor  
Heater Contactor  
Heater Contactor  
Y
480/120V  
G
BL  
W
5 Step  
Control  
White  
Typical wiring for boilers equipped with Auto Blowdown System and/or Solid State Sequencer  
WATER FEED SYSTEMS  
HIGH PRESSURE FEED  
1. Locate feed on level floor or platform.  
High pressure makeup water pumps are used when water pressure  
does not exceed boiler pressure by more than 10 psi and when con-  
densate water is not returned to the boiler. Note: Consult factory or  
sales office for motor/pump sizing for appropriate water feed system.  
2. Connect water line to tagged fitting on feed.  
3. Connect piping from discharge to water inlet check valve on boil-  
er with minimum of 90˚ bends or other restrictions.  
4. All electrical wiring should be done by licensed electricians in  
accordance with local and national electrical codes. Refer to boil-  
er instruction for manual wiring diagram.  
Installation  
WARNING: Hazard of Electric Shock. Water feed system  
must be effectively grounded in accordance with the  
National Electrical Codes to eliminate shock hazard.  
5. If pump is located less than 30 feet from boiler, a second check  
valve is required.  
Automatic High Pressure Water Feed Pump/Motor Assembly  
Pump Motor Dimensions  
Pipe  
Pressure Size  
Range (NPT)  
Dimensions (In.)  
Assembly  
Model  
HP  
A
B
C
D
E
F
ES-38020  
3/4  
0-200  
1/2 16-1/4  
3
7-3/16 4-7/8 6-1/2 6-1/8  
16  
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WATER FEED SYSTEMS  
CONDENSATE RETURN SYSTEMS  
B. The motor circuit should be wired into the pump control located on  
the boiler. See boiler instruction sheet for wiring diagram.  
C. All electrical wiring should be done by licensed electrician.  
D. Be sure to use the proper wire. Electrical wiring to boiler  
should be in accordance with National Electrical Code or local  
wiring code following wiring diagram supplied.  
Chromalox condensate return systems are used wherever condensed  
steam can be collected for reuse in the boiler. Significant energy can be  
saved by returning condensate to the boiler. The condensed water is free  
from corroding minerals and carries a substantial amount of heat which  
does not have to be replenished.  
IMPORTANT: Vacuum breaker is required whenever using a conden-  
Plumbing  
sate return system.  
A. Connect water line to tagged fitting on the motor and pump assem-  
Installation — Wiring  
bly control feeder.  
B. Interconnecting piping between boiler and condensate return system  
should be installed with a minimum of 90˚ bends or other restrictions.  
A. Check the voltage of the motor before making the wiring connection.  
Some Chromalox boilers are supplied with dual voltage systems. The  
motor should always match the voltage of the control circuit.  
1-1/4” NPT Vent  
L
30 Gal.  
Condensate  
Return Inlet  
Return System  
Make-Up Valve  
Inlet  
1-1/4” NPT  
3” NPT  
Discharge  
H
1” NPT  
Drain  
W
Dimensions (In.)  
Condensate  
Model  
Storage Tank  
Capacity (Gals.)  
Pump Discharge  
Conn. (NPT)  
Condensate  
Ref. Conn. (NPT)  
For Boiler Model  
Max. Pressure (psig)  
Pump (Hp) Motor (Volts/Phase)  
240 / 480 1  
L
H
W
HPCS-  
3003  
All CHPES  
250  
30  
3
1-1/4  
2
36  
42-3/16 24  
MAINTENANCE  
INSTRUCTIONS FOR ELEMENT REPLACEMENT  
WARNING:Before installing your new elements, be sure  
the McDonnell-Miller low-water cut-off is operating  
perfectly and the float chamber and lower equalizer  
column are completely clear of sludge or other foreign  
matter.  
WARNING: Hazard of Shock. Disconnect all power  
before working on boiler.  
Chromalox Electric Steam Boilers are designed for years of trouble-free  
performance. To establish a good preventative maintenance program,  
we suggest the building maintenance man or engineer familiarize him-  
self with these simple rules:  
1. The use of specific boiler cleaning compounds cannot be rec-  
ommended. We do recommend that a reputable firm of water treat-  
ment engineers be consulted regarding conditioning boiler water.  
Proper selection must be made of a compound to prevent damage to  
copper sheath heating elements.  
Failure to do this may cause the immediate burnout of the new ele-  
ments.  
All elements are thoroughly checked before shipment. The manu-  
facturer cannot be responsible for burnouts caused by a faulty low-water  
cut-off.  
The lower equalizer column can best be examined by breaking the  
unions on either side and then visually and manually examining the pip-  
ing with your fingers or probes to see if it is clear and clean.  
2. The sight glass should be checked daily to ensure the boiler has ade-  
quate water.  
3. A monthly inspection should be made of internal wiring. All elec-  
trical connections should be checked for tightness.  
A check for water or steam leaks should also be made and any loose  
fittings immediately tightened.  
4. If boiler is equipped with Solid State Auxiliary Low Water Cutoff,  
every four months the probe should be checked for deposits and  
cleaned, if necessary. This is accomplished by removing inspection  
plate, removing the probe (with a standard sparkplug wrench) clean-  
ing and replacing.  
Boiler  
1-1/2"  
1" Steam Equalizing Pipe  
Pump and Low  
Water Control  
Normal Boiler  
Water Level  
Note: The system will not operate if the boiler is using distilled,  
demineralized or deionized water. At the same time, one of the bot-  
tom heating elements should be removed. If scale has begun to form,  
all elements should be cleaned and boiler drained and flushed.  
5. IMPORTANT: The Manufacturers’ Data Report enclosed  
within the instruction sheet is very important and must be put in a  
safe place. You may be called upon to produce it by a state agency.  
Cutoff Level  
is Arrow Mark  
Blowdown  
Valve  
1" Water Equalizing Pipe  
17  
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MAINTENANCE  
READ COMPLETELY BEFORE STARTING WORK  
7. When all (6) flange bolts are tight, connect all wires to terminals.  
Make certain wires are clean and bright to assure good electrical  
contact and nuts on screws are firmly secured.  
WARNING: Avoid use of chemical cleaning com-  
pounds. Follow maintenance instructions.  
8. Open water valve so water supply can reach boiler feed mecha-  
nism.  
1. Disconnect boiler from electric power supply at main safety  
switch or fuse panel. Then, turn boiler switch to “off” position.  
2. On automatic feed units, close valve on incoming water line. Drain  
boiler completely of water.  
3. Open boiler door to expose heating element.  
4. Disconnect wire (electric) leads connecting element to main power  
system of boiler. Again note wire connections to facilitate  
reassembly. Proceed to remove (6) 5/16-18 bolts from flange.  
5. Thoroughly clean boiler flange of all foreign material. Be certain  
no part of old gasket remains on boiler flange.  
9. Put main safety switch to “on” position.  
10. Turn boiler to “on” position.  
11. As boiler automatically refills, observe the new flange assemble  
for possible leaks. If water is noticed, to bolts must be retightened.  
Before doing this, turn the boiler off at the main fuse safety switch.  
12. As boiler is heated to working pressure, check flange assembly  
again for leaks.  
6. Apply “Slic-Tite” Gasket Compound or equal to both surfaces of  
new gasket with supplied replacement element. Proceed to install  
element flange assembly with gasket between boiler flange and  
element flange. In doing this, be careful to align flange holes so  
wire connection terminals on element assembly are in line with  
previously disconnected wire leads to facilitate easy connections.  
WARNING: Avoid the use of chemical cleaning com-  
pounds. Follow maintenance instructions  
RENEWAL PARTS IDENTIFICATION  
Safety Valve  
Operating Pressure Control  
Range 10-300 Psi  
Manual Reset High  
Limit Control  
Steam Outlet  
Pressure Gauge, 0-600 Psi  
On/Off Switch and  
Pilot Light  
Water Level Sight Glass  
McDonnell & Miller #194  
Low Water Cutoff/Pump  
Check Valve/Water Inlet  
(not shown)  
Drain Blowdown Valve  
Drain Blowdown Valve  
18  
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RENEWAL PARTS IDENTIFICATION  
Part Description  
VALVES & GAUGES  
Part Number  
Part Description  
Part Number  
PRESSURE CONTROLS & SEQUENCES  
1/4” Ball Valve (Pressure Gauge) . . . . . . . . . . . . . . . . . . . . . . . .  
Blowdown Valve 1” CHPES-24A  
through 180A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Pressure Gauge 3-1/2” 0-600 psi CHPES-100A  
344-121194-007  
344-121194-042  
Operating Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Hi-Limit Control (Manual Reset) 15 psi . . . . . . . . . . . . . . . . . . .  
Proportional Pressure Control . . . . . . . . . . . . . . . . . . . . . . . . . .  
5-Step Motor-Driven Sequencer . . . . . . . . . . . . . . . . . . . . . . . .  
10-Step Motor-Driven Sequencer . . . . . . . . . . . . . . . . . . . . . . .  
6-Step Solid State Sequencer . . . . . . . . . . . . . . . . . . . . . . . . . .  
10-Step Solid State Sequencer . . . . . . . . . . . . . . . . . . . . . . . . .  
Siphon Tube for Pressure Controls . . . . . . . . . . . . . . . . . . . . . .  
429-300038-009  
429-300038-008  
429-300039-004  
323-121505-001  
323-121505-002  
323-300107-015  
323-300107-015  
215-300026-002  
CONTACTORS  
through 180A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Fusible Contactors  
30 amp with 35-60 amp 600V block . . . . . . . . . . . . . . . . . . . . .  
40 amp with 35-60 amp 600V block . . . . . . . . . . . . . . . . . . . . .  
50 amp with 35-60 amp 600V block . . . . . . . . . . . . . . . . . . . . .  
Non Fusible Contactors  
130-118661-012  
LOW WATER CUTOFF & PUMP CONTROLS  
072-122686-003  
072-122686-006  
072-122686-009  
MM-94 Control Complete (Auto Reset) . . . . . . . . . . . . . . . . . . .  
MM-94M Control Complete (Manual Reset) . . . . . . . . . . . . . . .  
292-300065-007  
292-300065-008  
CONTROL VOLTAGE TRANSFORMERS (120V SECONDARY)  
60 amp without fuse block . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
50 amp without fuse block . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
072-047913-016  
072-047913-019  
1KVA 208V Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1KVA 240/480V Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1-1/2 KVA 208V Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
1-1/2 KVA 240/480V Primary . . . . . . . . . . . . . . . . . . . . . . . . . . .  
315-300088-020  
315-300088-021  
315-300088-025  
315-300088-026  
POWER FUSES AND TERMINAL BLOCKS  
40 amp without fuse block . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
30 amp without fuse block . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
35 amp 600V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
40 amp 600V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
45 amp 600V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
50 amp 600V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
60 amp 600V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Fuse Block 35-60 amp 60 amp 600V . . . . . . . . . . . . . . . . . . . .  
Power Terminal Blocks  
072-047913-012  
072-047913-020  
128-123459-012  
128-123459-013  
128-123459-014  
128-123459-015  
128-123459-016  
129-047445-002  
COLD WATER INJECTION PUMPS (0-100 PSIG)  
Motor and Pump used in ES-38020 HP . . . . . . . . . . . . . . . . . . .  
Pump only used in ES-38020 HP . . . . . . . . . . . . . . . . . . . . . . . .  
Motor and Pump used in ES-38020 HP . . . . . . . . . . . . . . . . . . .  
Strainer used in ES-38020 HP . . . . . . . . . . . . . . . . . . . . . . . . . .  
V-Band Mount used in ES-38020 HP . . . . . . . . . . . . . . . . . . . . .  
Solenoid Valve used in ES-38020 HP . . . . . . . . . . . . . . . . . . . .  
226-300177-009  
226-300173-011  
193-121843-020  
351-118664-001  
355-300174-001  
344-121780-002  
3 Pole 115 amp 1 line circuit 1 load circuits . . . . . . . . . . . . . . .  
3 Pole 175 amp 1 line circuit 4 load circuits . . . . . . . . . . . . . . .  
303-071809-032  
303-071809-012  
CONDENSATE RETURN SYSTEMS  
Hose Assembly 18” Long used in EES-38020 HP . . . . . . . . . . . . .  
Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Overload . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Condensate Return System . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
349-300181-002  
128-121133-053  
359-122688-031  
296-300222-026  
HEATING ELEMENTS — SPECIFY VOLTAGE  
3 Pole 335 amp 1 line circuit 4 load circuits . . . . . . . . . . . . . . .  
3 Pole 335 amp 1 line circuit 8 load circuits . . . . . . . . . . . . . . .  
SINGLE PHASE  
12kW 208V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
12kW 480V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17kW 208V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17kW 480V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
THREE PHASE  
12kW 208V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
12kW 240V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
12kW 346V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
12kW 380V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
12kW 480V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17kW 208V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17kW 240V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17kW 346V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17kW 380V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
17kW 480V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
22.5kW 240V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
303-071809-014  
303-071809-016  
AUX LOW WATER CUT-OFF (OPTIONAL EQUIPMENT)  
155-554735-004  
155-554735-009  
155-554735-006  
155-554735-011  
Pump/Motor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Probe Spark Plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Aux Low Water Cut-off Board with Relay . . . . . . . . . . . . . . . . . .  
Aux Low Water Cut-off Board Without Relay . . . . . . . . . . . . . . .  
Relay for Aux Low Cut-off Board . . . . . . . . . . . . . . . . . . . . . . . .  
Probe 7-15/16” CHPES 6A through 18A . . . . . . . . . . . . . . . . . .  
Contact Factory  
346-300035-001  
323-300033-016  
323-300033-017  
072-300047-003  
242-300036-019  
155-554735-003  
155-554735-001  
155-554735-012  
155-554735-017  
155-554735-008  
155-554735-005  
155-554735-002  
155-554735-013  
155-554735-018  
155-554735-010  
155-554735-021  
MISCELLANEOUS PARTS  
Probe 9-1/2” CHPES 24A through 72A . . . . . . . . . . . . . . . . . . .  
Probe 10-15/16” CHPES-100A through CHPES-180A . . . . . . . .  
ON-OFF Switch with Pilot Light . . . . . . . . . . . . . . . . . . . . . . . . .  
Control Circuit Fuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Control Circuit Terminal Block 4 Pole 250V 20AMP . . . . . . . . .  
Control Circuit Fuse Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Blank Flange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Element Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
242-300036-002  
242-300036-017  
292-053223-002  
128-072576-027  
303-075443-003  
129-300029-001  
121-300199-001  
132-146012-001  
GAUGE GLASS ASSEMBLIES, CHECK VALVES & SIGHT GLASSES  
22.5kW 480V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
22.5kW 550V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Check Valve 1/2” CHPES-6A through 18A . . . . . . . . . . . . . . . . .  
Check Valve 3/4” CHPES-24A through 180A . . . . . . . . . . . . . . .  
Gauge Glass Assemble Valves  
(O-ring gaskets included) . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Protector Rods (2 Required) CHPES-6A  
through 18A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Protector Rods (2 required) CHPES-24A  
through 180A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
O-ring gaskets (2 required) . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Sight Glass Tubing, 7” CHPES-6A  
155-554735-022  
AUTO BLOWDOWN PARTS  
155-554735-019  
344-114590-013  
344-114590-014  
Stainless Steel Bolts (6 required) for Element . . . . . . . . . . . . . .  
Vacuum Breaker Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Motorized Valve 1/2” CHPES-6A through CHPES-18A . . . . . . . .  
Motorized Valve 1” CHPES-24A through CHPES-180A . . . . . . .  
Timer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Relay SPST No. 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Relay Interval Delay .6-60 Sec. 3 . . . . . . . . . . . . . . . . . . . . . . . .  
Switch Momentary Contact DPDT 4 . . . . . . . . . . . . . . . . . . . . . .  
Switch Rocker SPDT 5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Pilot Light Red 6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Terminal Block 4 Pole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Terminal Block 5 Pole . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Fuse Block 30A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Fuse 15A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
345-072565-428  
344-300149-003  
344-300089-009  
344-300089-010  
292-300101-002  
072-300072-002  
072-300148-001  
292-300146-001  
272-300147-001  
213-300145-001  
303-075444-003  
303-075444-004  
129-024494-001  
128-121133-072  
344-120970-004  
242-121047-008  
242-121047-001  
132-073284-003  
through 18A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  
Sight Glass Tubing, 9” CHPES-24A through 72A . . . . . . . . . . .  
Sight Glass Tubing, 11” CHPES-100A through 180A . . . . . . . .  
374-121046-006  
374-121046-038  
374-121046-015  
SAFETY VALVE  
250 psig 1/2” CHPES-6A through 180A . . . . . . . . . . . . . . . . . . .  
344-300032-006  
19  
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Limited Warranty:  
Please refer to the Chromalox limited warranty applicable to this product at  
2150 N. RULON WHITE BLVD., OGDEN, UT 84404  
Phone: 1-800-368-2493  
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