Chromalox PD438-2 User Manual
Chromalox
®
DIVISION 4 SECTION
PTHF
SALES
REFERENCE
DATE
SERVICE REFERENCE
Installation, Operation
and
Maintenance Instructions
PD438-2
161-620127-001
AUGUST, 1998
(Supersedes PD438-1)
GENERAL
© 2010 Chromalox, Inc.
Type PTHF Over-the-Side Immersion Heater
WARNING:
This heater is not intended for use in hazardous atmospheres where flammable vapors, gases,
liquids or other combustible atmospheres are present
as defined in the National Electrical Code. Failure to
comply can result in explosion or fire.
Chromalox type PTHF over-the-side immersion heaters are
especially suited for heating corrosive solutions to 212˚F.
WARNING: It is the responsibility of the purchaser of the
heater to make the ultimate choice of sheath material based
upon his knowledge of the chemical composition of the corrosive solution, character of the materials entering the solution,
and controls which he maintains on the process. Chromalox
cannot warrant any electric immersion heater against failure by
sheath corrosion if such failure is the result of operating beyond
our control.
1. Heater Construction Characteristics
A. High quality resistance wire held in place by compacted
magnesium oxide in stainless steel sheath.
B. Medium Watt Density.
C. Light weight and low profile.
D. Manual rest cutout to shut off heater in an overtemperature
condition is standard.
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 be glad to make equipment recommendations.
Model
Dimensions (In.)
Approx.
Number
Volts Phase kW
ABC
Weight (Lbs.)
PTHF-302 240 1 or 3 3 16 7 9 7
PTHF-304 480 1 or 3 3 16 7 9 7
PTHF-402 240 1 or 3 4 18 9 9 8
PTHF-404 480 1 or 3 4 18 9 9 8
PTHF-602 240 3 6 22 13 9 9
PTHF-604 480 3 6 22 13 9 9
PTHF-802 240 3 8 27 18 9 10
PTHF-804 480 3 8 27 18 9 10
PTHF-1002 240 3 10 31 22 9 11
PTHF-1004 480 3 10 31 22 9 11
Specifications
INSTALLATION
WARNING:
Hazard of Electrical Shock. Disconnect all
power before installing heater.
1. WARNING: Do not scrape or scratch thermal cutout capil-
lary on heating elements. Damage could result.
2. Before installing the type PTHF heater, inspect it for possible
damage which may have occurred during shipment. Also, check
to insure the line voltage is the same as that on the nameplate.
3. WARNING: Mount heater in the tank so the liquid level will
always be above the effective heated portion of the heater. If
heater is not properly submerged, it will overheat and damage
the heating elements and create a possible fire due to excessive sheath temperature.
4. In an electroplating operation the heaters are not, under any
circumstance, to be placed between the electrodes and the work.
4-5/8"
A ±1/4"
B ±1/8"
C ±1/8"
2-13/16"
Spacer Bar
1/2"
1"
9-1/8" ±1/4"
Cold End
1-1/2"
7/8 Dia. Hole Each Side
For 1/2 in. Conduit
Integral Manual Reset
Thermal Cutout
Cat No. Volts Watts
Phase Date Code
Part Number
5/16" x 1-1/2"
Slot For Mounting
2 Places
6"
5"
4-11/16"
1-1/2"
B Dimension is heated section. C Dimension is cold section.
Note: “XX” after model number denotes special dimensions.
Figure 1
WIRING
WARNING:
Hazard of Electric Shock. Any installation
involving electric heaters must be effectively grounded
in accordance with the National Electrical Code to eliminate shock hazard.
1. Electrical wiring to heater must be installed in accordance
with the National Electrical Code and local electric codes by a
qualified person. WARNING: Use copper conductors only.
2. Wire heater with manual reset thermal cutout as shown in
Figures 2 thru 4.
Note:
1. Manual reset thermal cutout rating 25 amps 120-277 Vac.
2. Customer supplied thermostat/liquid level control wiring not
shown.
INSTALLATION
5. DANGER: Hazard of Fire. Since these heaters are capa-
ble of developing high temperatures, care should be taken to
maintain liquid level above heated portion (dimension B of
Figure 1) of heater.
OPERATION
1. Do not operate heater at voltages in excess of that stamped on
the heater since excess voltage will shorten heater life.
2. Always maintain a minimum of 2” of solution above the heater
portion of the element 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 dry.
(Note: Heated portion of element is Dimension B of Figure 1).
3. Sludge should not be allowed to build-up to the point where it
contacts heater as this can lead to premature heater failure.
4. Maximum recommended process temperature is 212˚F.
5. If manual reset cutout trips, disconnect power to heater and
check for cause of overheat condition. Correct condition, then
remove heater terminal cover and push black reset button to reset
the cutout. Assemble terminal cover before re-energizing heater.
MAINTENANCE
WARNING:
Hazard of Severe Shock. Disconnect all
power to heater before servicing or replacing heaters.
1. Heaters should be checked periodically for corrosion buildup
and cleaned if necessary.
2. Tank should be checked regularly for sediment around the end
of heater as this sediment can act as an insulation and shorten
heater life.
3. WARNING: Do not scratch or scrape thermal cutout capil-
lary when cleaning. Cleaning should be done chemically.
C1
1
2
3
3
2
1
C2
2 Pole Contactor
Customer Supplied
Line Voltage
Ground
Factory
Field
Cutout
Green
120V or 240V
Control Circuit
C1
1
3 Pole Contactor
Customer Supplied
Line Voltage
Ground
Factory
Field
Cutout
Green
120V or 240V
Control Circuit
2
3
3
2
1
C2
C1
3 Pole Contactor
Customer Supplied
Line Voltage
Ground
Factory
Field
Cutout
Green
120V or 240V
Control Circuit
C2
1
2
3
1
2
3
Single Phase for:
PTHF-302, -304, -402, -404
Figure 2
Figure 3
Three Phase for:
PTHF-602, -604, -802, -804, -1002, -1004
Three Phase for:
PTHF-302, -304, -402, -404
Figure 4
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493 www.chromalox.com
TA - Q0 - EF
Litho in U.S.A.
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
http://www.chromalox.com/customer-service/policies/termsofsale.aspx.
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