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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 haz-
ardous 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 corro-
sive 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 conse-
quences 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 recommenda-
tions.
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 exces-
sive 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