Specifications
3-25
JOHNSON CONTROLS
FORM 102.20-N1 (1109)
3
FIG. 3-25 – MINIMUM AIR VELOCITY REQUIRED FOR SAFE OPERATION
2
4
6
8
10
12
14
16
0
100
2
200 300 400 500 600 700 800 900 1000 1100 1200
4
6
8
10
12
14
16
18
22
24
26
28
30
32
20
0
0
KW PER SQ. FT. FACE AREA
MINIMUM AIR VELOCITY REQUIRED
(FEET PER MINUTE)
KW PER SQ. FT. FACE AREA
MINIMUM AIR VELOCITY REQUIRED
(FEET PER MINUTE)
FINNED
TUBULAR
CONSTRUCTION
91 - 100° Inlet Air
81 - 90° Inlet Air
Below 80° Inlet A
ir
OPEN COIL
CONSTRUCTION
100 200 300 400 500 600 700 800 900 1000 1100 12000
Electric Heat Startup
Rotating parts and electrical shock
hazards exist. Lock out and tag out
the fan motor(s) and heat power
disconnects before servicing. FOL-
LOW THE LATEST “LOCKOUT
TAGOUT” PROCEDURE. Failure
to follow proper safety precau-
tions may result in serious injury
or death
All electrical connections in the heater, including
both eld and factory made connections, should be
checked for tightness before operating the heater.
In addition, after a short period of operation,
all connections should again be checked for
tightness.
DO NOT operate electric heat be-
low the minimum airow require-
ment.
A visual inspection of the heater elements should be
made prior to use of the heater. If physical damage is
evident, a Megohm test should be used to validate the
heater elements are safe for use. If a minimum value
of 10 megohms is not achieved then any damaged
elements or ceramic insulators must be replaced prior
to operation.
Ensure lters are clean and airow is
at minimum requirement or greater.
Preferably 100 % for this start up
procedure.
To operate this heater make sure all associated control
equipment is on, energize main supply disconnect and
set controlling thermostat above ambient temperature.
This heater is equipped with automatic and manual
reset temperature limiting controls. If it fails to operate,
make sure manual resets are operative by pushing reset
buttons.
Airow Requirements
See Fig. 3-25
Calculate KW per square foot of duct area as:
duct area (Sq.Ft.)