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HEATER SELECTION AND INSTALLATION
Heaters should be selected on the basis of the actual
full load current and service factor as shown on the mo-
tor nameplate or in the motor manufacturer's published
literature.
When motor and overload relay are in the same ambi-
ent and the service factor of the motor is 1. 1 5 to 1.25,
select heaters and set FLA adjustment dial from the
heater application table. If the service factor of the
motor is 1.0, or there is no service factor shown, ro-
tate the FLA adjustment dial counter-clockwise one
half (1/2) position.
The conductors attached to the terminals of an overload
relay act as a heat sink and are a consideration in es-
tablishing the current rating of each heater element. To
prevent nuisance tripping, which will occur if undersized
conductors are used, select the wire size as if the con-
ductors had an insulation temperature rating of 75°C,
even if the conductors actually used have a temperature
rating higher than 75°C.
Protect heater and starter against short circuits by pro-
viding branch circuit protection in accordance with the
National Electric Code.
Note: Before installing heater packs, refer to the motor
nameplate for FLA (full load amps) and service factor
(1.5 or 1.0). Select the heater pack from the proper table
below.
To install:
A. Insert
three
(3)
identically numbered
heater packs into the
overload relay with
an FLA rating that in-
cludes the motor
nameplate FLA (full
load amps).
B. Tighten the heater
pack
mounting
screws securely per
r e c o m m e n d e d
torque values listed
below.
Heater Pack Numbers
H2001B thru H2017B
H2018 thru H2024
OVERLOAD RELAY HEATER SELECTION
Recommended Torque
9 lb-in [1 N - m]
24-30 lb-in [2.7-3.4 N-m]
PART 7
C. Adjust the FLA adjustment dial to the motor name-
plate FLA (full load amps).
THE OVERLOAD IS NOW
SET FOR 1.15 SERVICE
FACTOR.
D. If the motor nameplate is
1.0 service factor, rotate
the FLA adjustment dial
counter-clockwise one half
(1/2) position.
E. The overload is factory set
for M (MANUAL) reset
operation. If automatic
reset is required, turn the
reset adjustment dial to
A (AUTO). Automatic reset
is not intended for
two-wire control devices.
TO REMOVE HEATER PACKS
Loosen two (2) heater packs mounting screws and re-
move heater pack from overload relay.
OVERLOAD RELAY SETTING -This bimetalic ambient
compensated overload relay is adjustable within the FLA
range of the heater pack. Each heater pack is marked
with its FLA ratings. With proper heater section, the over-
load relay will ultimately trip at 125% FLA for a 1. 1 5
service factor motor and at 115% FLA for a 1.0 service
factor motor.
HEATER SELECTION / INSTALLATION - Select the ap-
propriate heater pack number which corresponds to the
motor FLA rating for your application. Insert each heater
into the overload relay and tighten heater mounting
screws securely per table below.
NOTE: A total of three individual heaters must be in-
stalled in order for the overload relay to work properly.
Heater Pack Numbers
H2001B thru H2017B
H2018 thru H2024
- Page 17 -
Torque
9 lb-in
24-30 lb-in
I.B. 8926-1
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