Chromalox Electric Heater PN400 3 User Manual
Installation, Operation  
and  
4
RST  
(Supersedes PN400-2)  
PN400-3  
161-049178-001  
RENEWAL PARTS IDENTIFICATION  
MAY, 1986  
Type RST and RSTO  
Unitary Electric Immersion Heaters  
3” Schedule 40  
Steel Pipe  
Immersed Length or “B”  
Dimension From End  
Of Adaptor Box To  
End Of Tubes  
Specifications – Table A  
Tank  
Heater  
Amperes**  
Adapter Box Dimensions (In.)  
Holding  
Temperature  
(°F)  
Approximate  
Net Weight  
(Lbs.)  
“B”  
No.  
Capacity Dimensions  
kW 240V  
480V  
18.5  
24.5  
30.6  
36.5  
46.2  
Model †  
Height  
81/  
Depth  
81/  
Length  
Dimension*  
Tubes  
175  
225  
275  
325  
375  
175  
225  
325  
375  
175  
225  
275  
325  
375  
175  
225  
275  
325  
375  
15  
20  
25  
30  
38  
18  
24  
36  
37.0  
49.0  
61.2  
73.0  
92.4  
RST (or) RSTO-21915  
RST (or) RSTO-21920  
RST (or) RSTO-21925  
RST (or) RSTO-51530  
RST (or) RSTO-52038  
RST (or) RSTO-31518  
RST (or) RSTO-41524  
RST (or) RSTO-61536  
RST (or) RSTO-81545  
RST (or) RSTO-31720  
RST (or) RSTO-41726  
RST (or) RSTO-51732  
RST (or) RSTO-61740  
RST (or) RSTO-71848  
RST (or) RSTO-31922  
RST (or) RSTO-41930  
RST (or) RSTO-51936  
RST (or) RSTO-61945  
RST (or) RSTO-72156  
2
4
20  
20  
20  
35  
35  
19’  
2
2
2
5
5
3
4
6
8
3
4
5
6
7
3
4
5
6
7
560  
560  
560  
1100  
1300  
635  
905  
1270  
1710  
695  
925  
1135  
1440  
1620  
8’ (Dia.)  
8,000  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
2
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
81/  
4
19’  
x
2
4
19’  
Gal.  
21’6”  
2
4
15’  
2
4
19’6”  
44.3  
58.7  
87.6  
22.2  
29.4  
43.8  
54.6  
2
4
25  
30  
40  
50  
25  
30  
35  
40  
45  
25  
30  
35  
40  
45  
25  
30  
35  
40  
45  
15’  
10’6” (Dia.)  
10,000  
x
2
4
15’  
Gal.  
2
4
15’  
15’6”  
45 109.2  
2
4
14’6”  
20  
26  
32  
40  
49.0  
63.5  
78.0  
97.2  
24.5  
31.7  
39.0  
48.6  
58.2  
2
4
17’  
10’6” (Dia.)  
12,000  
2
4
16’6”  
16’6”  
17’  
x
2
4
Gal.  
18’6”  
2
4
48 116.4  
2
4
17’6”  
18’8”  
19’  
18’6”  
19’  
20’6”  
19’6”  
23’  
25’  
25’6”  
26’  
22  
30  
36  
54.0  
73.0  
87.6  
27.0  
36.5  
43.8  
54.6  
68.0  
2
4
725  
10’6” (Dia.)  
15,000  
2
4
1055  
1230  
1530  
1830  
x
2
4
Gal.  
23’3”  
45 109.2  
56 136.0  
2
4
2
4
175  
225  
275  
325  
375  
24  
36  
58.7  
87.6  
48 116.4  
60 145.2  
72 174.2  
29.4  
43.8  
58.2  
72.6  
87.1  
RST (or) RSTO-32024  
RST (or) RSTO-42336  
RST (or) RSTO-52548  
RST (or) RSTO-62660  
RST (or) RSTO-72672  
2
4
3
4
5
6
7
755  
10’6” (Dia.)  
20,000  
2
4
1205  
1605  
1790  
2260  
x
2
4
Gal.  
30’101/  
2
”
2
4
2
4
*Heated length is four inches shorter than “B” dimension.  
**All amperes based on 3-phase 60 cycle power.  
† T suffix letter indicates 7 day 24 hour time clock, F suffix letter indicates flange mounting instead of adaptor box.  
© 2010 Chromalox, Inc.  
 
WIRING  
Typical Wiring Diagram for  
Type RST and RSTO  
Figure 2  
OPERATION  
2. Set the indicating temperature control at the desired temperature  
and the over-temperature cutout 50°F above this temperature.  
3. Close the control box door and turn the circuit breaker on. To  
energize the heater circuits, turn the on-off selector switch to  
the “on” position.  
CAUTION: To avoid possible damage to the heater,  
do not energize until the tank is filled with fluid.  
Recommended fluid level is 2” above the heater  
tube or pipe.  
1. Turn the master circuit breaker off and open the control box door.  
MAINTENANCE  
CAUTION: Hazard of Electrical Shock. Disconnect  
all power before servicing or replacing the heaters.  
1. To remove the heating element, first turn the circuit breaker to  
the off position. Then open the control box door and remove  
the screws from the sheet metal isolating panel located in the  
lower half of the control box.  
2. When removing the heating elements, make certain that the ter-  
minals and the ceramic insulators (RSTO type only) do not  
contact oil or any other liquid foreign matter.  
Note: Chromalox cannot be responsible for failures or damage  
caused by contamination on the ceramic insulators.  
3. Next remove the element wiring and finally the element  
mounting screw. Now pull the element straight out of the heat-  
ing tube.  
4. Note: Check electrical connections at heater terminals and  
tighten if necessary. This will help avoid hot temrinals which  
could destroy wiring insulation or heater terminals.  
-3-  
 
MAINTENANCE  
Overtemperature Cutout  
Tank  
Adapter  
Box  
OPTIONAL EQUIPMENT  
Figure 3  
Table 3  
No. Tubes  
A
B
C
D
E
F
G
H
J
K
L
M
Gasket P/N  
15  
13  
1
2
3
4
5
6
7
8
201/  
251/  
301/  
351/  
401/  
451/  
501/  
551/  
2
181/  
231/  
281/  
331/  
381/  
431/  
481/  
531/  
2
13/  
23/  
21/  
13/  
23/  
21/  
13/  
23/  
4
5
6
8
10  
11  
13  
15  
16  
15  
18  
24  
30  
33  
39  
45  
48  
–
1
2
3
4
5
6
7
–
22  
24  
28  
32  
34  
38  
42  
44  
1
2
3
4
5
6
7
8
73/  
73/  
123/  
123/  
123/  
173/  
223/  
223/  
4
/
16  
/
13  
16  
16  
132-122539-001  
132-122539-002  
132-122539-003  
132-122539-004  
132-122539-005  
132-122539-006  
132-122539-007  
132-122539-008  
15  
2
2
4
5
4
/
16  
/
13  
16  
15  
2
2
4
10  
15  
20  
25  
30  
35  
4
/
16  
/
13  
16  
15  
2
2
4
4
/
16  
/
13  
16  
15  
2
2
4
4
/
16  
/
13  
16  
15  
2
2
4
4
/
16  
/
13  
16  
15  
2
2
4
4
/
16  
/
13  
16  
15  
2
2
4
4
/
16  
/
CHROMALOX TYPE TMC 7-DAY TIMER (SUFFIX T)  
TMC 7-day Calendar, Electric Dial Timer is used to provide  
automatic start-up/off-on control of large tank heaters or could be  
set up for non-peak operation. Standard features: 7-day calendar  
dial permits different on/off schedules on different days of week.  
2 to 14 replaceable trippers for up to 4 on/off operations per day,  
up to 28 on/off operations per week. 3 hour minimum on or off  
time; 21 hour maximum on or off time. Independent 4-pole design  
allows SPST, DPST, SPDT switching. Manual on/off lever trans-  
fers switch operation without disburbing daily or weekly preset  
schedule. Heavy duty synchronous motor suitable for operation  
between –40°F and +140°F. Switch slider bar assures positive  
switching. Heavy duty terminals accommodate up to AWG No. 8  
Wire.  
-4-  
 
OPTIONAL EQUIPMENT  
OPERATION  
“Off” Setting – de-energized the entire control circuit, thus de-  
energizing all heating circuits in the system.  
“Automatic” Setting – allows the Day-Night Clock Panel to  
cycle the control system according to the program clock dial trip-  
per settings.  
To Set Trippers – refer to picture for typical setup of a Seven Day  
Program. Two trippers must be used for each day; an “A” tripper  
for switching from “Night Setback” to “Day Operation” and a “B”  
tripper for switching from “Day Operation” to “Night Setback”.  
WARNING: To set the correct day and time at begin-  
ning of initial start-up, ROTATE THE PROGRAM  
CLOCK DIAL CLOCKWISE ONLY. DO NOT ATTEMPT  
TO TURN POINTER!  
Adjusting and Maintenance of Time Switch:  
1. Periodically check trippers to insure that they are tightly fas-  
tened to Program Clock dial.  
WARNING: Tighten trippers with fingers only!  
2. Rotate Program Clock dial CLOCKWISE one hour in Spring to  
adjust for daylight savings time (in areas where required). In  
Fall, carefully rotate clock dial CLOCKWISE approximately  
one full turn to reset at correct day and time for standard time.  
Check all trippers to insure they have not moved during rotation.  
3. The Program Clock motor is permanently lubricated.  
Lubrication of other parts is not required.  
Renewal  
Part No.  
Volts  
Model  
Operation  
60 Hz  
Switch  
Amps  
4 Pole  
2 N.O.  
2 N.C.  
4. The Program Clock switch contacts are factory set and need no  
field adjustment.  
TMC71 311-057070-001  
Seven Day  
120  
40  
TYPE RST RENEWAL PARTS IDENTIFICATION  
240 Volts  
480 Volts  
Contactor #1  
Model  
Element  
Circuit Breaker  
Contactor #1  
Contactor #2  
Fuse  
Element  
Circuit Breaker  
Contactor #2  
Fuse  
RST-21915 157-120541-001 104-071818-024 072-120812-012 072-120812-012 128-114696-012 157-120541-002 104-071818-020 072-120812-012 072-120812-012 128-114696-029  
RST-21920 157-120541-003 104-071818-025 072-120812-008 072-120812-008 128-114696-012 157-120541-004 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RST-21925 157-120541-005 104-071818-028 072-120812-008 072-120812-008 128-114696-012 157-120541-006 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RST-51530 157-120541-007 104-071818-028 072-120812-008 072-120812-009 128-114696-012 157-120541-008 104-071818-024 072-120812-008 072-120812-012 128-114696-029  
RST-52038 157-120541-023 104-071818-045 072-120812-009 072-120812-009 128-114696-012 157-120541-024 104-071818-026 072-120812-008 072-120812-012 128-114696-029  
RST-31518 157-120541-007 104-071818-025 072-120812-012 072-120812-008 128-114696-012 157-120541-008 104-071818-020 072-120812-012 072-120812-012 128-114696-029  
RST-41524 157-120541-007 104-071818-026 072-120812-008 072-120812-008 128-114696-012 157-120541-008 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RST-61536 157-120541-007 104-071818-046 072-120812-009 072-120812-009 128-114696-012 157-120541-008 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RST-81545 157-120541-029 104-071818-049 072-120812-009 072-120812-009 128-114696-012 157-120541-030 104-071818-028 072-120812-008 072-120812-008 128-114696-029  
RST-31720 157-120541-009 104-071818-025 072-120812-012 072-120812-008 128-114696-012 157-120541-010 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RST-41726 157-120541-015 104-071818-028 072-120812-009 072-120812-009 128-114696-012 157-120541-016 104-071818-024 072-120812-012 072-120812-012 128-114696-029  
RST-51732 157-120541-019 104-071818-045 072-120812-009 072-120812-009 128-114696-012 157-120541-020 104-071818-026 072-120812-008 072-120812-012 128-114696-029  
RST-61740 157-120541-009 104-071818-045 072-120812-009 072-120812-009 128-114696-012 157-120541-010 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RST-71848 157-120541-031 104-071818-046 072-120812-009 072-120812-010 128-114696-013 157-120541-032 104-071818-028 072-120812-009 072-120812-009 128-114696-029  
RST-31922 157-120541-011 104-071818-026 072-120812-008 072-120812-009 128-114696-012 157-120541-012 104-071818-022 072-120812-012 072-120812-008 128-114696-029  
RST-41930 157-120541-001 104-071818-029 072-120812-009 072-120812-009 128-114696-012 157-120541-002 104-071818-024 072-120812-008 072-120812-008 128-114696-029  
RST-51936 157-120541-021 104-071818-045 072-120812-009 072-120812-009 128-114696-012 157-120541-022 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RST-61945 157-120541-001 104-071818-046 072-120812-009 072-120812-009 128-114696-012 157-120541-002 104-071818-028 072-120812-008 072-120812-008 128-114696-029  
RST-72156 157-120541-033 104-071818-020 072-120812-010 072-120812-010 128-114696-013 157-120541-034 104-071818-029 072-120812-009 072-120812-009 128-114696-029  
RST-32024 157-120541-013 104-071818-026 072-120812-008 072-120812-009 128-114696-012 157-120541-014 104-071818-022 072-120812-012 072-120812-008 128-114696-029  
RST-42336 157-120541-017 104-071818-045 072-120812-009 072-120812-009 128-114696-012 157-120541-018 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RST-52548 157-120541-025 104-071818-046 072-120812-009 072-120812-010 128-114696-013 157-120541-026 104-071818-028 072-120812-008 072-120812-008 128-114696-029  
RST-62660 157-120541-027 104-071819-020 072-120812-010 072-120812-010 128-114696-013 157-120541-028 104-071818-029 072-120812-009 072-120812-009 128-114696-011  
RST-72672 157-120541-035 104-071817-016 072-120812-010 072-120812-010 128-114696-013 157-120541-036 104-071818-029 072-120818-009 072-120812-009 128-114696-011  
-5-  
 
TYPE RSTO RENEWAL PARTS IDENTIFICATION  
240 Volts  
480 Volts  
Contactor #1  
Model  
Element  
Circuit Breaker  
Contactor #1  
Contactor #2  
Fuse  
Element  
Circuit Breaker  
Contactor #2  
Fuse  
RSTO-21915 063-120517-001 104-071818-024 072-120812-012 072-120812-012 128-114696-012 063-120517-002 104-071818-020 072-120812-012 072-120812-012 128-114696-029  
RSTO-21920 063-120517-003 104-071818-025 072-120812-008 072-120812-008 128-114696-012 063-120517-042 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RSTO-21925 063-120517-043 104-071818-028 072-120812-009 072-120812-009 128-114696-012 063-120517-006 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RSTO-51530 063-120517-007 104-071818-028 072-120812-009 072-120812-009 128-114696-012 063-120517-008 104-071818-024 072-120812-008 072-120812-012 128-114696-029  
RSTO-52038 063-120517-023 104-071818-045 072-120812-009 072-120812-009 128-114696-012 063-120517-024 104-071818-026 072-120812-008 072-120812-012 128-114696-029  
RSTO-31518 063-120517-007 104-071818-025 072-120812-012 072-120812-008 128-114696-012 063-120517-008 104-071818-020 072-120812-012 072-120812-012 128-114696-029  
RSTO-41524 063-120517-007 104-071818-026 072-120812-009 072-120812-009 128-114696-012 063-120517-008 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RSTO-61536 063-120517-007 104-071818-045 072-120812-009 072-120812-009 128-114696-012 063-120517-008 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RSTO-81545 063-120517-037 104-071818-046 072-120812-009 072-120812-009 128-114696-012 063-120517-037 104-071818-028 072-120812-008 072-120812-008 128-114696-029  
RSTO-31720 063-120517-009 104-071818-025 072-120812-012 072-120812-008 128-114696-012 063-120517-010 104-071818-022 072-120812-012 072-120812-012 128-114696-029  
RSTO-41726 063-120517-015 104-071818-028 072-120812-009 072-120812-009 128-114696-012 063-120517-016 104-071818-024 072-120812-012 072-120812-012 128-114696-029  
RSTO-51732 063-120517-019 104-071818-045 072-120812-009 072-120812-009 128-114696-012 063-120517-020 104-071818-026 072-120812-008 072-120812-012 128-114696-029  
RSTO-61740 063-120517-009 104-071818-045 072-120812-009 072-120812-009 128-114696-012 063-120517-010 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RSTO-71848 063-120517-031 104-071818-046 072-120812-009 072-120812-010 128-114696-013 063-120517-032 104-071818-028 072-120812-009 072-120812-009 128-114696-029  
RSTO-31922 063-120517-011 104-071818-026 072-120812-008 072-120812-009 128-114696-012 063-120517-012 104-071818-022 072-120812-012 072-120812-008 128-114696-029  
RSTO-41930 063-120517-001 104-071818-029 072-120812-009 072-120812-009 128-114696-012 063-120517-002 104-071818-024 072-120812-008 072-120812-008 128-114696-029  
RSTO-51936 063-120517-021 104-071818-045 072-120812-009 072-120812-009 128-114696-012 063-120517-022 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RSTO-61945 063-120517-001 104-071818-046 072-120812-009 072-120812-009 128-114696-012 063-120517-002 104-071818-028 072-120812-008 072-120812-008 128-114696-029  
RSTO-72156 063-120517-033 104-071818-020 072-120812-010 072-120812-010 128-114696-013 063-120517-034 104-071818-029 072-120812-009 072-120812-009 128-114696-029  
RSTO-32024 063-120517-013 104-071818-026 072-120812-008 072-120812-009 128-114696-012 063-120517-014 104-071818-022 072-120812-012 072-120812-008 128-114696-029  
RSTO-42336 063-120517-017 104-071818-045 072-120812-009 072-120812-009 128-114696-012 063-120517-018 104-071818-026 072-120812-008 072-120812-008 128-114696-029  
RSTO-52548 063-120517-025 104-071818-046 072-120812-009 072-120812-010 128-114696-013 063-120517-026 104-071818-028 072-120812-008 072-120812-008 128-114696-029  
RSTO-62660 063-120517-027 104-071819-020 072-120812-010 072-120812-010 128-114696-013 063-120517-028 104-071818-029 072-120812-009 072-120812-009 128-114696-011  
RSTO-72672 063-120517-035 104-071817-016 072-120812-010 072-120812-010 128-114696-013 063-120517-036 104-071818-029 072-120812-009 072-120812-009 128-114696-011  
PARTS COMMON TO ALL RST AND RSTO  
Hand Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .292-122885-001  
Contacts N.O. for Switch . . . . . . . . . . . . . . . . . . . . . . . .071-122886-001  
Fuse Block 2 Poles . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .129-050365-001  
Breaker Handle NEMA IV Handle . . . . . . . . . . . . . . . . . . . .139-071820-013  
Optional Equipment  
Window Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .168-071922-001  
Temperature Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .300-121011-006  
Overtemperture Control . . . . . . . . . . . . . . . . . . . . . . . . . . .300-057515-003  
Control Relay 2 Poles . . . . . . . . . . . . . . . . . . . . . . . . . . . . .072-120461-018  
Pilot Lights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213-122884-003  
Amber Lens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213-122884-007  
Red Lens . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .213-122884-004  
Time Clock 7-day . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .311-057070-001  
Adapter Flange Gasket . . . . . . . . . . . . .See Table 3 – Optional Equipment  
Limited Warranty:  
Please refer to the Chromalox limited warranty applicable to this product at  
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.  
2150 N. RULON WHITE BLVD., OGDEN, UT 84404  
Phone: 1-800-368-2493  
www.chromalox.com  
 

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