Chromalox PE436 User Manual

Chromalox

®

Installation, Operation

and

RENEWAL PARTS IDENTIFICATION

DIV. SEC.

GCHMT

NUMBER 3001

SALES

REFERENCE

DATE

SERVICE REFERENCE

PE436

161-303183-001

AUGUST, 1994

(Supersedes PF465)

GENERAL

INSTALLATION

© 2010 Chromalox, Inc.

Chromalox Type GCHMT Circulation Heater For

Steam, Gas and Air Heating

DANGER:

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 Electric Code. Failure to comply can result in
explosion or fire.

Hazardous area terminal enclosures are available, consult your
local Chromalox representative for details.

The GCHMT series is a general-purpose gas or steam circula-

tion heater intended for use indoors.

The 3 incoloy-sheathed tubular elements are centered in a 3”

diameter steel heating chamber and welded to a removable screw

plug. The assembly is surrounded by 1-1/2” insulation and sheet
metal jacket.

Depending upon the specifications, the GCHMT may or may
not be factory equipped with AR or other Chromalox thermostats.
Such thermostats function to control outlet temperatures under
abnormal flow condition. These controls do not fail-safe.

WARNING:

Users should install adequate back-up 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.

WARNING:

Hazard of electric shock. Disconnect all power

before installing heater.

1. Vertical mounting (axis of chamber vertical as in sketch
above) is preferred. Check factory for recommendations on hori­zontal mounting.

2. To avoid excess temperatures at electrical wiring, mount
heater with terminal enclosure at bottom, and use lower nozzle as
inlet to the circulating steam, air, or gas.

3. The GCHMT series of circulation heaters are provided with
mounting lugs to support the heater chamber. Refer to sketch
above for location of these mounting lugs.

4. Mount heaters to permit unrestrained expansion of chamber

due to temperature. This can be accomplished by using a slotted
mounting assembly on either of the lugs.

5.

DANGER:

Hazard of fire.

Provide minimum of 6” spacing
from a chamber and related piping to nearest combustible materi­al. Avoid operation of heater near combustible fluids or in com­bustible vapor or gas laden atmosphere.

6. Provide adequate space at terminal end to permit withdrawal
of the heater from chamber should servicing be required.

7. If two or more heaters are needed to provide the needed heat­ing capacity, arrange them for series gas or vapor flow.

8.

DANGER:

Possible explosion.

A pressure relief valve
should be provided by customer at outlet of vessel. There should
be no other valving between vessel and valve.

Watts Dimensions (in.)
Catalog Per
Number Voltage Phase KW Sq.In. A B C

GCHMT-30105 120 1

1

15

20-1/2 9-3/8 —

GCHMT-3105 240 or 480 1 or 3 23
GCHMT-30305

1 or 3 3

15

30-5/8 22-1/2 16-1/2

GCHMT-3305

240 or 480

23

GCHMT-30505

1 or 3 5

15 56-3/8 45-1/4 39-1/4

GCHMT-3505

240 or 480

23 30-5/8 22-1/2 16-1/2

GCHMT-30755

1 or 3 7.5

15 67-1/8 56 50

GCHMT-3075

240 or 480

23 56-3/8 45-1/4 39-1/4

GCHMT-30905

1 or 3 9

15 78-1/8 67 61

GCHMT-3905

240 or 480

23 56-7/8 45-1/4 39-1/4

Specifications — Table A

WARNING: Safe operating conditions depend on operating pressure, mass velocity
of gas and discharge temperature of the gas. At a given discharge gas temperature
heater element sheath temperature, and pipe body temperature tend to increase as gas
flow (mass velocity) decreases. The standard GCHMT has a 750˚F limitation on the
carbon steel body and a 1500˚F limit on the incoloy sheath elements. Check factory if
any doubt exists as to temperatures that will be encountered in your specific applica­tion. A stainless steel body is required at pipebody temperatures above 750˚F.

(Std.)

(Std.)

WIRING

WARNING:

Hazard of electrical shock. Any installation
involving electric heaters must be grounded to earth to elim­inate shock hazard.

1. Electrical wiring to heater must be installed in accordance
with the National Electric Code and/or local electrical codes.

2. When element wattages are not equal, heaters must not be
connected in series.

3. Electrical wiring to heater should be connected in rigid con-

duit or in flexible hose to keep corrosive vapors and liquids out of
the terminal housing. If high humidity is encountered, the conduit
should slope down away from the heater.

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 wire as shown in the diagram. (Figures 1 thru 3)

NOTE: Dotted lines indicate “customer furnished.”

OPERATION

1. Do not heat materials that are corrosive to the heating element
sheath or chamber. For steam heating service, condensate drain
may be provided from bottom of chamber. Check factory.

2. Terminal ends of heater must be protected from drippings con­densation spray or direct spill-over of material whose presence at
the terminals may damage heater electrical insulation. Liquid-

tight terminal enclosures are available to protect heater. Check
with local sales representative.

3. If foreign material is carried by the gaseous flow, install suit­able filters in the inlet pipe to the heater.

4. Do not allow heater to operate when steam, air or gas flow is
interrupted.

MAINTENANCE

WARNING:

Hazard of electric shock. Disconnect all power

before servicing heater.

1. Remove heating element assembly periodically to check
heater sheath for corrosion or excessive oxidation. Correct operat­ing conditions to minimize sheath deterioration.

2. Periodically check temperature control and limit control oper­ation to insure accurate and safe process operation.

3. Check all electrical connections periodically and retighten
connections which may have loosened in service. Replace wire
terminals which show signs of oxidation which would interfere
with establishment of reliable electrical connections.

RENEWAL PARTS IDENTIFICATION

THERMOSTAT 200-550˚F..........................300-048518-013

2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: [phone] www.chromalox.com

TA - U0 - EF

Printed in U.S.A.

3 Pole Contactors

3 Heating Elements

Line

Control
Volts

Thermostat

2 Pole Contactors

1, 2, or 3 Heating Elements

in Series

Line

Control
Volts

Thermostat

or Parrallel

3 Pole Contactors

3 Heating Elements

Line

Control
Volts

Thermostat

Figure 1

For Three Phase WYE Heaters

Figure 2

For Single Phase Heaters

Figure 3

For Three Phase Delta Heaters

Limited Warranty:

Please refer to the Chromalox limited warranty applicable to this product at

http://www.chromalox.com/customer-service/policies/termsofsale.aspx.