Chromalox Electric Heater PD441 1 User Manual

®
Chromalox  
SERVICE REFERENCE  
Installation, Operation  
DIVISION  
SALES  
4
SECTION MTO-LT  
(Supersedes PD441)  
and  
REFERENCE  
PD441-1  
MAINTENANCE INSTRUCTIONS  
161-303567-001  
DATE  
MARCH, 1999  
Type MTO-LT  
Pipe Insert Immersion Heater  
A
Expansion Gap  
B
2-3/8”  
Max.  
Spacer  
2-1/16”  
I.D. Min.  
Type E2  
Moisture-Tight  
Explosion-Resistant  
Enclosure  
Pipe, Support &  
Tank (by others)  
Expansion Gap  
3/4” Pipe Outlet  
GENERAL  
Dim. (In.)  
A
Pipe  
Thd.  
the ultimate choice of pipe material based upon his knowledge of the  
chemical composition of the corrosive solution, character of the material  
entering the solution and controls which he maintains on the process.  
Chromalox cannot warrant any electric immersion heater against failure,  
if such failure is the result of corrosion due to improper material selec-  
tion by the user.  
Model  
kW  
Volts  
Phase  
B
MTO-241LT  
MTO-241LT  
MTO-251LT  
MTO-251LT  
MTO-275LT  
MTO-275LT  
MTO-212LT  
MTO-213LT  
4
4
5
240  
480  
240  
480  
240  
480  
480  
480  
1
1
1
1
1
1
1
1
127  
127  
163  
163  
211  
211  
319  
367  
120  
120  
156  
156  
204  
204  
312  
360  
2
2
2
2
2
2
2
2
5
7.5  
7.5  
11.5  
13  
1. Heater Construction Characteristics:  
A. High quality resistance wire held in place by compacted  
Magnesium Oxide Refractory enclosed in an Incoloy® sheath.  
B. Low to High Watt densities.  
C. Explosion Resistant/Liquid-Tight E-2 terminal enclosures  
are standard.  
WARNING: Calculate and allow for thermal expansion.  
Pipe insert will expand upon heating. The rear end of the  
pipe insert must remain free from the tank wall. Heating  
elements will also expand upon heating and must not  
extend to the end of the pipe insert.  
Chromalox type MTO-LT screwplug immersion heater is designed  
for insertion into a 2” or larger pipe.  
WARNING: It is the responsibility of the purchaser of the heater to make  
WARNING: Users should install adequate controls and  
safety devices with their electric heating equipment.  
Where the consequences of failure may be severe, back-  
up controls are essential. Although the safety of the  
installation is the responsibility of the user, Chromalox  
will assist in identifying equipment options.  
INSTALLATION  
WARNING: Hazard of Shock. Disconnect all power  
before installing heater.  
This Portion of Heater Above Liquid Level and  
Exposed to Air Will Lead to Premature Burnout of Element  
Expected Low  
Level of Liquid  
1. Before installing, check your type MTO-LT pipe insert heater  
for any damage that may have occurred during shipment.  
2. Check to insure that the line voltage is the same as that stamped  
on the nameplate.  
3. Do not bend the heating elements. If bending is necessary,  
WRONG  
consult factory.  
RIGHT  
Expected Maximum  
4. IMPORTANT: Mount heater in the tank so that the liquid level  
will always be above the effective heated portion of the heater (see  
Figure 1). If the heater is not properly submerged, it may overheat  
and damage the heating elements and create a possible fire hazard  
due to excessive sheath temperatures.  
Sediment Level  
Note: Locate Heater as low as possible for maximum liquid storage capacity. Heat  
does not move downward.  
5. Where work will pass over or near equipment, additional protec-  
tion such as a metal guard may be needed.  
Figure 1 - Open Tank Installation  
© 2010 Chromalox, Inc.  
 
OPERATION  
1. Do not operate heaters at voltages in excess of that stamped on the  
ject to a humid environment. This moisture absorption results in a  
cold insulation resistance of less than twenty megohms. Normally,  
this megohm value corrects itself after heatup and does not affect  
heater efficiency or life.  
heater since excess voltage will shorten heater life.  
2. Always maintain a minimum of 2” of liquid above the heater to  
prevent exposure of the effective heated length. If the heater is not  
properly submerged, it may overheat and shorten heater life. DO  
NOT OPERATE HEATER IF TANK IS DRY.  
A low megohm condition can easily be corrected by removing the  
terminal hardware and terminal enclosure and baking the heater in  
an oven at 350˚F for several hours, preferably overnight. Note:  
The lid must be removed from the housing.  
3. Be sure all trapped air is removed from a closed tank. Bleed the air  
out of the liquid piping system and heater housing prior to ener-  
gizing.  
Note: The tank or heating chamber in closed tank systems  
must be kept filled with liquid at all times.  
An alternate procedure is to energize the heaters at low voltage  
until the megohm reading returns to normal. When energizing  
heaters in air, the sheath temperature should not exceed 750˚F.  
4. Keep heating elements above sediment deposits.  
5. Low Megohm Condition — The refractory materials used in  
electric heaters may absorb moisture during transit or when sub-  
MAINTENANCE  
3. Remove any accumulated sludge deposits from around pipe  
and from tank.  
WARNING: Hazard of Shock. Disconnect all power to  
heater before servicing or replacing heaters.  
4. Check for loose terminal connections and tighten if necessary.  
5. If corrosion is indicated in the terminal housing, check terminal  
box gasket and replace if necessary. Check conduit layout to cor-  
rect conditions that allow corrosion to enter the terminal housing.  
6. Clean terminal ends of all contamination.  
1. Heaters should be checked periodically for coatings and corrosion  
and cleaned if necessary.  
2. The tank should be checked regularly for sediment around the  
heater pipe insert as sediment can act as an insulator and shorten  
heater life.  
 
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  
TA - Q0 - EF  
Litho in U.S.A.  
 

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