Chromalox PE429-1 dimensions General, Installation, Operation, Regular and Fuel Oil Heating

Installation, Operation

and

RENEWAL PARTS IDENTIFICATION

4	NWHO
(Supersedes PE429)	PE429-1

161-058065-001

FEBRUARY, 1986

2 x 3/4”

Slot

B

D

A 6” Outlet

Temperature

Control

6” Inlet

E 1”

813/16”

5 Conduit
Outlets
72° Apart
or		C
6 Conduit	Mounting
Outlets	Lug Centers
60° Apart

Type NWHO-45, 72, 108

Circulation Heaters for

Regular and Fuel Oil

Heating

Specifications – Table A

					Dimensions (In.)
			No. 3Ø
Model	Volts 3Ø	kW	Circuits	A	B	C	D	E
NWHO-4590	240 or 480	90	5	721/2	251/2	635/8	1813/16	121/2
NWHO-45125	240 or 480	125	5	871/2	251/2	785/8	1813/16	121/2
NWHO-45150	240 or 480	150	5	1021/2	251/2	935/8	1813/16	121/2
NWHO-45175	240 or 480	175	5	1171/2	251/2	1085/8	1813/16	121/2
NWHO-45200	240 or 480	200	5	125	251/2	1161/8	1813/16	121/2
NWHO-77220	240 or 480	200	6	971/2	273/4	885/8	19	133/4
NWHO-77225	240 or 480	225	6	1051/2	273/4	965/8	19	133/4
NWHO-77250	240 or 480	250	6	1131/2	273/4	1045/8	19	133/4
NWHO-108300	240 or 480	300	6	981/2	291/2	895/16	193/8	141/2
NWHO-108325	240 or 480	325	6	1041/2	291/2	955/16	193/8	141/2
NWHO-108350	240 or 480	350	6	1101/2	291/2	1011/16	193/8	141/2

These Dimensions are typical. Check factory for dimensions of a particular unit.

GENERAL

The high capacity NWHO-45, 72 or 108 series are intended for indoor use and are used primarily for oil heating.

The 45, 72 or 108 steel sheathed tubular elements are centered in a 14”, 16” or 18” diameter steel heating chamber, respectively, and welded to a removable steel flange. The assembly is sur- rounded by 2” of insulation and a sheet metal jacket.

Depending upon the order specifications, the NWHO-45, 72 or 108 may or may not be factory equipped with an MF2 or other Chromalox thermostat. Such thermostats function to control outlet

temperatures and to limit internal temperatures under abnormal flow conditions. These controls do not fail-safe.

CAUTION: 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 essen- tial. Although the safety of the installation is the responsibility of the user, Chromalox will be glad to make equipment recommendations.

1.Vertical mounting (axis of chamber vertical) is preferred. Check factory for constructions suitable for hori- zontal mounting.

2.Mount heater with terminal enclo- sure at top, and use lower nozzle as inlet to the circulating fluid.

3.The NWHO-45, 72 and 108 series of circulation heaters are provided with mounting lugs to support the heater chamber. Refer to Figure A for one suggested mode of support.

4.Mount heaters to permit unre- strained expansion of chamber due to temperature. The large flange lug

INSTALLATION

should be bolted solidly; however, the remaining lug should be bolted loosely to allow freedom of movement with expansion.

5. DANGER: Hazard of Fire. Provide minimum of 6” spac- ing from chamber and related piping to nearest combustible material. Avoid operation of heater near combustible fluids or in combustible vapor or gas laden atmosphere. Note: Contact factory for heaters suitable for use in hazardous locations.

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 heat- ing capacity, arrange them for series flow.

8.DANGER: Possible Explosion. A pressure relief valve

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

Figure A

© 2010 Chromalox, Inc.