Chromalox PE414-3 User Manual

Chromalox

®

(Supersedes PE414-2)

PE414-3

NWH

161-304777-001

MAY, 2007

4

RENEWAL PARTS IDENTIFICATION

Installation, Operation

and

Circulation

Heaters for Oil or Water Heating

© 2010 Chromalox, Inc.

Specifications – Table A

GENERAL

READ ALL INSTRUCTIONS BEFORE USE

FIRE/EXPLOSION HAZARD. Ordinary location
heaters (designated E1) are 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 personal injury or
property damage.

This design has the versatility of field adjustments of voltage

kW through various wiring combinations.

The NWHSRG model is a general purpose water circulation
heater intended for indoor use. E2 designs have a Moisture
Resistant/Explosion Resistant enclosure. Designs are up to 40kW

- DO NOT USE THE NWHSRG MODEL FOR OIL.

The NWHOSR model is a general-purpose regular and fuel oil
solution circulation heater intended for use indoors. E2 designs
have a Moisture Resistant/Explosion Resistant enclosure. Designs
are up to 10kW - DO NOT USE THE NWHOSR MODEL FOR
WATER. Ensure the wiring guide for oil is used for the correct
wiring diagram.

Both the NWHSRG and NWHOSR use six INCOLOY

®

sheath
elements welded to a steel 2.5” screw plug. The vessel is cast iron
and is surrounded by 1.5” insulation and a sheet metal jacket. For
water applications, the vessel has a galvanized coating. A J-type
thermocouple in a thermowell is standard. These

versaTHERM

TM

heaters

are designed for 150 psig max. at 35°F min. to 300°F max.

IMPORTANT: 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.

ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do
so could result in personal injury or property dam­age. Heater must be installed or serviced by a
qualified person in accordance with the National
Electrical Code. NFPA 70.

The system designer is responsible for the safety
of this equipment and should install adequate
back-up controls and safety devices with their
electric heating equipment. Where the conse­quences of failure could result in personal injury or
property damage, back-up controls are essential.

If foreign material is to be carried by the liquid flow, install

suitable filters in the inlet pipe to the heater.

Ensure the temperature/pressure is controlled below the vapor
point of the liquid at all times and is within the temperature/pres­sure ratings for this heater.

Heating elements must be completely immersed in liquid when
energized.

Dim. (In.)

A B Model PCN

Cast Iron Body / Oil .5 to 10 kW

29 19 NWHOSR-06-04P5-E1 100108
29 19 NWHOSR-06-04P5-E1 100116
41 30

3

/4 NWHOSR-06-005P-E1 100124
29 19 NWHOSR-06-006P-E1 100132
29 19 NWHOSR-06-006P-E1 100140
41 30

3

/4 NWHOSR-06-010P-E1 100159

Galvanized Body / Water .5 to 40 kW

29 19 NWHSRG-06-018P-E1 100010
29 19 NWHSRG-06-018P-E1 100028
41 30

3

/4 NWHSRG-06-020P-E1 100036
29 19 NWHSRG-06-024P-E1 100044
29 19 NWHSRG-06-024P-E1 100079
41 30

3

/4 NWHSRG-06-040P-E1 100095

A

B

6"

Rotatable
Terminal
Cover

1" Conduit
Opening

Outlet
1" FNPT

Inlet
1" FNPT

1" FNPT Pipe Plug
(or Inlet)

8 / "

1

2

4"

2 Mtg. Lugs
/ "-13 x / " Deep

1

1

2

2

Specifications – Table B

Dim. (In.)

A B Model PCN

Cast Iron Body / Oil .5 to 10 kW

32 19 NWHOSR-06-04P5-E2 100255
32 19 NWHOSR-06-04P5-E2 100263
44 30

3

/4 NWHOSR-06-005P-E2 100271
32 19 NWHOSR-06-006P-E2 100280
32 19 NWHOSR-06-006P-E2 100298
44 30

3

/4 NWHOSR-06-010P-E2 100300

Galvanized Body / Water .5 to 40 kW

32 19 NWHSRG-06-018P-E2 100327
32 19 NWHSRG-06-018P-E2 100343
44 30

3

/4 NWHSRG-06-020P-E2 100351
32 19 NWHSRG-06-024P-E2 100360
32 19 NWHSRG-06-024P-E2 100378
44 30

3

/4 NWHSRG-06-040P-E2 100386

Dimensions (Inches)

A

B

11"

7-7/8"

6"

E1

E2

TM

INSTALLATION

ELECTRIC SHOCK HAZARD. Disconnect all power
before installing heater. Failure to do so could
result in personal injury or property damage.
Heater must be installed by a qualified person in
accordance with the National Electrical Code.
NFPA 70.

1. Vertical Mounting (Preferred) —

When the heater is vertically mounted, the electrical enclosure
will be at the top of the heater. The inlet pipe will be located on
the side near the bottom of the heater and the outlet pipe at the
top.

The axis of the chamber will be in a vertical position as in
Figure A.

2. Horizontal Mounting (Optional) —
When mounting heater horizontally, inlet and outlet pipes must
be up. In any other position, heater cannot be purged of air, and
elements may be seriously damaged. (See Figure B.)

Note: Heater cannot be completely drained in the horizontal posi­tion. When mounting the heater, allow adequate spacing for drain­ing the heater.

3. Whether vertical or horizontal, the heater should be rigidly
mounted so that vibration is at a minimum since excessive
vibration will result in erratic thermostat operation (if thermo­stat is used instead of thermocouple). The NWHOSR/NWH­SRG is provided with mounting lugs to support the heating
chamber. (See drawing on front page.)

FIRE HAZARD. An integral thermostat, if used, is
designed for temperature control service only.
Because the thermostat is not fail safe, it should
not be used for temperature limiting duty. Wiring to
this device is the responsibility of the user.

FIRE HAZARD. Since heaters are capable of devel­oping high temperatures, extreme care should be
taken to:

A. Provide minimum of 6” spacing from chamber

and related piping to nearest combustible mate­rial.

B. Do not operate near combustible fluids or in

combustible vapor or gas laden atmosphere.

4. Ensure clearance is available to allow removal of the heating

assembly from the chamber. Generally this is a space extend­ing from the electrical enclosure equal to the length of the
entire unit. Otherwise, removing the entire heater may be
required to service the heater.

5. Standard side inlet can be changed to the end connection for

ease of piping.

6. Mount heaters to permit unrestrained expansion of the chamber

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

7. If two or more heaters are required to provide the heating

capacity, pipe units in series or parallel.

EXPLOSION HAZARD. When heating in closed ves­sels, controls and back-up controls must be used
to regulate build-up of temperature and/or pres­sure.

8. A pressure relief valve should be provided by customer at out-

let of vessel. There should be no other valving between vessel
and relief valve.

9. Install adequate collection/drainage below the heater to prevent

damage to other materials and property at your location.

Figure B — Horizontal Mounting

Figure A — Vertical Mounting

Correct

Correct

Incorrect

Incorrect

2

3

WIRING

ELECTRIC SHOCK HAZARD. Any installation involv­ing electric heaters must be performed by a quali­fied person and must be effectively grounded in
accordance with the National Electrical Code to
eliminate shock hazard.

Ensure the correct Wiring Guide is used for your
heated medium and model type, and ensure the
correct wiring diagram is used. Miswiring could
result in an unsafe wattage.

1. Be sure line voltage matches your intended voltage and does

not exceed the max voltage on the nameplate.

2. Electric wiring to heater must be installed in accordance with

local and National Electrical Codes by a qualified person as
defined in the NEC.

3. Power controllers must be used with this product.

4. Electrical wiring to heater should be with rigid conduit or flex-

ible conduit to keep corrosive vapors and liquids out of the
electrical enclosure. If high humidity is encountered, the con­duit should slope down away from the heater.

5. Refer to appropriate wiring diagram for your model heater

from the Wiring Guide (on next two pages).

The specific Wiring Guide provides easy to follow steps to
determine the appropriate wiring diagram for your heater instal­lation. Figure 1 may be referenced as a general diagram of how
a contactor and temperature control are used in conjunction
with the specific wiring diagrams.

6. Use ground fault protection equipment where electrical insula-

tion failure can cause process problems.

7. When element wattages are not equal, heaters must not be con-

nected in series.

8. If flexible cord is employed, a watertight connector should be

used for entry of the cord into the electrical enclosure. Outdoor
applications require liquid-tight conduit and connectors.

9. If application uses a standard PCN at different voltages and

kWs from the Wiring Guide, refer to the Customer Wiring
Guide Supplement if included with these instructions, or con­tact Customer Service at [phone].

Note: Dotted lines indicate “customer furnished.” Complete power/temperature
control panels or components are available. Contact Chromalox 1-800-443-2640

for more information and assistance.

Contactor

Thermostat

L1

L2

To equipment disconnect
with overcurrent protection

L1
L2
L3

Heater

1Ø or 3Ø: Refer to wiring
diagram designated from the
the Wiring Guide for specific
wiring directions to
the heater.

or

Temperature control

L1

L2

Thermocouple

}}

Type "J"
thermocouple
is standard.

Control voltage

Figure 1