®
Chromalox
SERVICE REFERENCE
Installation, Operation
and
Maintenance Instructions
DIVISION
SALES
4
SECTION PTHF
(Supersedes PD438-1)
161-620127-001
REFERENCE
PD438-2
DATE
AUGUST, 1998
Type PTHF Over-the-Side Immersion Heater
5"
Specifications
Cat No. Volts Watts
Phase Date Code
4-11/16"
Part Number
Dimensions (In.)
Model
Number
Approx.
Weight (Lbs.)
1-1/2"
Volts Phase kW
5/16" x 1-1/2"
A
B
7
C
Slot For Mounting
2 Places
6"
7/8 Dia. Hole Each Side
For 1/2 in. Conduit
PTHF-302
PTHF-304
PTHF-402
PTHF-404
PTHF-602
PTHF-604
PTHF-802
PTHF-804
PTHF-1002
PTHF-1004
240
480
240
480
240
480
240
480
240
480
1 or 3
3
3
16
16
18
18
22
22
27
27
31
31
9
9
9
9
9
9
9
9
9
9
7
1 or 3
7
7
Integral Manual Reset
Thermal Cutout
4-5/8"
1 or 3
4
9
8
1 or 3
4
9
8
3
3
3
3
3
3
6
13
13
18
18
22
22
9
6
9
C
1/8"
A
1/4"
Cold End
1"
8
10
10
11
11
1-1/2"
8
10
10
B
1/8"
B Dimension is heated section. C Dimension is cold section.
Note: “XX” after model number denotes special dimensions.
Spacer Bar
1/2"
9-1/8" 1/4"
2-13/16"
Figure 1
GENERAL
1. Heater Construction Characteristics
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.
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.
Chromalox type PTHF over-the-side immersion heaters are
especially suited for heating corrosive solutions to 212˚F.
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.
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.
INSTALLATION
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.
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.
4. In an electroplating operation the heaters are not, under any
circumstance, to be placed between the electrodes and the work.
© 2010 Chromalox, Inc.
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