General, Installation, Chromalox

Chromalox®

Installation Instructions

SERVICE REFERENCE

and

DIVISION 4

SECTION NWHO

SALES

(Supersedes PE408-3) PE408-4

RENEWAL PARTS IDENTIFICATION

REFERENCE

161-048341-001

1-3/8” Conduit

DATE JULY, 1990

Openings

16-1/16

Type NWHO-6

2” Pipe

Outlet

Circulation Heaters (for

Thermostat

Regular and Fuel Oil Heating)

Type AR

A B 25”

2” Pipe Inlet

8-5/8

Specifications — Table A

			Regular Oil Heaters

Mounting Lugs	Model	Volts	Phase	kW	W/In2		Dimensions (In.)
Mounting Lugs	Model	Volts	Phase	kW	W/In2	A		B	C
3/8” - 16						A		B	C
Threaded Holes -	NWHO-61215	240 or 480	3 Δ	12	23	41-3/4		30	11-3/8
1-1/2” Deep	NWHO-61515	240 or 480	3 Δ	15	23	48-3/4		37	14-1/8
1-1/4” Centers	NWHO-62015	240 or 480	3 Δ	20	23	60-1/4		48-1/2	20-5/8
	NWHO-62515	240 or 480	3 Δ	25	23	73-5/8		61-7/8	27-5/16
	NWHO-63015	240 or 480	3 Δ	30	23	86-5/8		74-7/8	33-7/8

			Fuel Oil Heaters

	NWHO-60825	240 or 480	1 or 3 Δ	8	15	41-3/4		30	11-3/8
	NWHO-61025	240 or 480	3 Δ	10	15	48-3/4		37	14-1/8
	NWHO-61225	240 or 480	3 Δ	12	15	60-1/4		48-1/2	20-5/8
	NWHO-61525	240 or 480	3 Δ	15	15	73-5/8		61-7/8	27-5/16
	NWHO-61825	240 or 480	3 Δ	18	15	86-5/8		74-7/8	33-7/8

GENERAL

The NWHO-6 series is a general-purpose regular and fuel oil solution circulation heater intended for use indoors. It is designed for 150 psig at 550˚F per ANSI standards.

The 6 steel-sheathed tubular elements are centered in a 5” diameter galvanized steel heating chamber and welded to a removable galvanized steel flange. The assembly is surrounded by 1-1/2” insulation and sheet metal jacket.

Depending upon the order specifications, the NWHO-6 may or may not be factory equipped with an AR or other Chromalox thermostat. (Note: UL listed models are factory pre-set with a

212˚F limit stop.) Such thermostats function to control outlet tem- peratures and to limit internal temperatures under abnormal flow conditions. These controls do not fail safe.

WARNING: Users should install adequate back-up con- trols and safety devices with their electric heating equip- ment. 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.

INSTALLATION

Caution: Hazard of Electric Shock. Disconnect all power before installing heater.

1.Vertical Mounting (Preferred) —

When the heater is vertically mounted, the terminal housing 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 the photo above and as in Figure A.

Note: A drain pipe located at the bottom of the heater should be pro- vided and enough room left, when mounting heater, to allow draining the heater.

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.)

Correct

Incorrect

Correct Incorrect