Chromalox ADH-005 Installation Instructions Manual page 4

General
FIRE/EXPLOSION HAZARD. This heater is not in-
tended for use in hazardous atmospheres where
flammable vapors, gases, liquids or other combus-
tible atmospheres are present as defined in the Na-
tional Electrical Code. Failure to comply can result
in personal injury or property damage.
1. Heater construction characteristics —
A. Alloy sheathed tubular elements, .475" diameter
B. Steel flange
C. Stainless steel support construction
D. High temperature alloy terminals and connections
E. Replaceable individual heating elements
F. Wiring terminals located outside the heated zone
2. Maximum Temperatures — Types ADH and ADHT pro-
cess air heaters can generally be used at the following
maximum temperatures shown, provided the minimum
air velocity is maintained uniformly through the heater.
Max. Outlet Air Temp. (˚F)
Air Velocity
(Ft./Sec.)
4
9
16
25
36
Do not energize heater in air with a velocity less
than 1 Ft. Per Second.
3. The heater may be bolted to the duct with the terminal
housing and flange at the top, at either side or at the bot-
tom.
4. Several heaters may be mounted in tandem so long as
proper controls are used to limit the maximum tempera-
ture attained.
5. Installation with duct transitions in some air distribution
systems, the duct heater may be considerably larger than
the ductwork and the duct area must be increased by a
sheet metal transition. The slope of the transformation
piece on the upstream side of the equipment is limited
to 30° as indicated in Figure 3. On the leaving side, the
slope should not be more than 45°.
Air
Flow
4 Ft. Min.
Figure 3
6. Use moisture proof terminal cover in atmospheres bear-
ADH ADHT
800 1050
800 1100
800 1150
800 1200
800 1200
30"
45˚
Max
45˚
30˚
Max
4 Ft. Min.
ing corrosive fumes or excessive moisture.
7. Use explosion resistant heaters in explosive atmospheres
and reduce current rating to elements.
8. Gas tight design — Achieved by the use of threaded fit-
tings with fiber washers to attach heating elements to
flange — prevents leakage of ducted air into terminal
housing.
9. Overtemperature protection— Thermocouple fastened to
the element sheath surface and wired to a terminal block
can be provided for accurate overheat protection (stan-
dard on ADHT models).
10. Flange mounting gasket — Packed separately with each
duct heater to minimize air leakage between the flange
and air duct. Refer to Table B and Figure 4.
Specifications – Table B
Flange Gasket
Part No. Flange Size
168-055429-001 11-1/8 x 5-5/8
168-055429-002 11-1/8 x 7-5/8
168-055429-003 11-1/8 x 9-5/8
168-055429-004 11-1/8 x 11-5/8
168-055429-005 11-1/8 x 13-5/8
168-055429-006 11-1/8 x 15-5/8
168-055429-007 11-1/8 x 17-5/8
168-055429-008 11-1/8 x 19-5/8
168-055429-009 11-1/8 x 21-5/8
168-055429-010 11-1/8 x 23-5/8
168-055429-011 11-1/8 x 27-5/8
168-055429-012 11-1/8 x 31-5/8
168-055429-013 11-1/8 x 35-5/8
168-055429-014 11-1/8 x 39-5/8
168-055429-015 11-1/8 x 43-5/8
168-055429-017
168-055429-018
Flange
Mounting
Gasket
Figure 4
4
Used on ADH
and ADHT
5 kW
10 kW
15 kW
20 kW
25 kW
30 kW
35 kW
40 kW
45 kW
50 kW
60, 120 kW
70kW
80, 144, 160 kW
90, 162, 180 kW
100 kW
20 x 27-5/8 216, 240 kW
20 x 33-5/8 270, 300 kW
2-1/2" x 1-1/4" x 3/4"
Knockouts
Duct Wall