Chromalox NWHO-6 Installation Instructions And Renewal Parts Identification

Installation Instructions

RENEWAL PARTS IDENTIFICATION
1-3/8" Conduit
Openings
C
A
B 25"
2" Pipe Inlet
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
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.
Correct
© 2010 Chromalox, Inc.
Chromalox
and
16-1/16
2" Pipe
Outlet
Thermostat
Type AR
8-5/8
Incorrect
Figure A — Vertical Mounting
®
Circulation Heaters (for
Regular and Fuel Oil Heating)
Specifications — Table A
Mounting Lugs
Model
3/8" - 16
Threaded Holes -
NWHO-61215
1-1/2" Deep
NWHO-61515
NWHO-62015
1-1/4" Centers
NWHO-62515
NWHO-63015
NWHO-60825
NWHO-61025
NWHO-61225
NWHO-61525
NWHO-61825
GENERAL
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
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.)
SERVICE REFERENCE
4
DIVISION SECTION
SALES
(Supersedes PE408-3)
REFERENCE
JULY, 1990
DATE
Type NWHO-6
Regular Oil Heaters
Volts Phase kW W/In 2
240 or 480 3 Δ 12 23
240 or 480 3 Δ 15 23
240 or 480 3 Δ 20 23
240 or 480 3 Δ 25 23
240 or 480 3 Δ 30 23
Fuel Oil Heaters
240 or 480 1 or 3 Δ 8 15
240 or 480 3 Δ 10 15
240 or 480 3 Δ 12 15
240 or 480 3 Δ 15 15
240 or 480 3 Δ 18 15
Correct
Incorrect
Figure B — Horizontal Mounting
NWHO
PE408-4
161-048341-001
Dimensions (In.)
A B C
41-3/4 30 11-3/8
48-3/4 37 14-1/8
60-1/4 48-1/2 20-5/8
73-5/8 61-7/8 27-5/16
86-5/8 74-7/8 33-7/8
41-3/4 30 11-3/8
48-3/4 37 14-1/8
60-1/4 48-1/2 20-5/8
73-5/8 61-7/8 27-5/16
86-5/8 74-7/8 33-7/8