Chromalox PD441-1 User Manual
Chromalox
®
DIVISION 4 SECTION
MTO-LT
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation, Operation
and
MAINTENANCE INSTRUCTIONS
PD441-1
MARCH, 1999
(Supersedes PD441)
161-303567-001
© 2010 Chromalox, Inc.
Type MTO-LT
Pipe Insert Immersion Heater
GENERAL
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
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 selection by the user.
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: Users should install adequate controls and
safety devices with their electric heating equipment.
Where the consequences of failure may be severe, backup 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.
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,
consult factory.
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.
5. Where work will pass over or near equipment, additional protec-
tion such as a metal guard may be needed.
Note: Locate Heater as low as possible for maximum liquid storage capacity. Heat
does not move downward.
Figure 1 - Open Tank Installation
Dim. (In.) Pipe
Model kW Volts Phase A B Thd.
MTO-241LT 4 240 1 127 120 2
MTO-241LT 4 480 1 127 120 2
MTO-251LT 5 240 1 163 156 2
MTO-251LT 5 480 1 163 156 2
MTO-275LT 7.5 240 1 211 204 2
MTO-275LT 7.5 480 1 211 204 2
MTO-212LT 11.5 480 1 319 312 2
MTO-213LT 13 480 1 367 360 2
Expected Low
Level of Liquid
This Portion of Heater Above Liquid Level and
Exposed to Air Will Lead to Premature Burnout of Element
Expected Maximum
Sediment Level
Type E2
Moisture-Tight
Explosion-Resistant
Enclosure
A
B
Spacer
Expansion Gap
Pipe, Support &
Tank (by others)
Expansion Gap
2-1/16”
I.D. Min.
2-3/8”
Max.
3/4” Pipe Outlet
RIGHT
WRONG
INSTALLATION
6. Heater must not be operated in sludge.
7. Install the heater using a high quality pipe sealing compound on
the threads. Screw the heater into the opening (Figure 2). Tighten
sufficiently with wrench applied on the hex portion of the screwplug.
8. Closed Tank Installation
NOTE: When heating in closed vessels, controls and
back-up controls must be used to prevent buildup of temperature and/or pressure.
A. Horizontal Position (Figure 3)
A1. Place heater at an elevation so that natural circulation can take
place.
A2. Position outlet and inlet in a vertical plane, facing upward to
prevent air pockets. Be sure all trapped air is removed from the
closed tank. Bleed the air out of the liquid piping system and
heater housing prior to operation.
A3. IMPORTANT: Heater should never be located at the highest
point in the system. Provide expansion tank, if necessary.
B. Vertical Position (Figure 4)
9. DANGER: Hazard of Fire — Since the heaters are
capable of developing high temperatures, extreme
care should be taken to:
A. Avoid contact between heaters and combustible materials.
B. Keep combustible materials far enough away to be free of the
effects of high temperatures.
Locate Drain Pipe
at Bottom of Heater.
Sediment Deposits may be
Removed Through Drain Pipe
Maximum Sediment Level.
Install Heater Above
This Level But as Near to it as
Possible for Maximum Heated
Solution Storage Capacity
Suitable
Wiring
Drip Loop Recommended
to Minimize Passage of
Moisture Along Wiring
Into Terminal Wiring
and Connections
Outlet
Inlet
Figure 4 - Closed Tank in Vertical Position
Heater
Outlet
Inlet
Note: In a Forced Circulation System,
Use Pump In Inlet Side
Figure 3 - Closed Tank in Horizontal Position
WIRING
WARNING: Hazard of Shock. Any installation involving
electric heaters must be effectively grounded in accordance with the National Electrical Code.
1. Electric wiring to heater must be installed in accordance with
the National Electrical Code and with local codes by a qualified
person as defined in the NEC. WARNING: Use copper con-
ductors only.
2. When element wattages are not equal, heaters must not be
connected in series.
3. Electrical wiring to heater should be contained in rigid con-
duit or in sealed flexible hose to keep corrosive vapors and liquids out of the terminal housing.
4. If flexible cord is employed, a watertight connector should be
used for entry of the cord into the terminal box. Outdoor applications require liquid-tight conduit and connectors.
5. Bring the power line wires through the opening in the terminal
box. Connect line wires as shown in the wiring diagram (see
Figure 5).
WARNING: Care must be taken to insure the heated portion does not extend into the
coupling area (see Dimensions).
Approx. 6” Cold
Figure 2 - Exploded View Pipe Insert Heater Mounting
2”
L-1
L-2
240-480V — Figure 5
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