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A05-228-01

5551R with

6

″ base

5551B/5551R

The 5551B Intelligent Thermal Sensor’s unique dual

thermistor sensor will alarm at a fixed temperature of

135

°F.

The 5551R Intelligent Thermal Sensor will alarm at

135

°F and at an increase in excess of 15° per minute. This

enables the heat detector to communicate an alarm to the

central control panel prior to reaching the static set point,

providing a timely response to rapid temperature

increases.

Specifications – 5551B, 5551R

Dimensions

Height:

2.1

″ (5.3 cm) detector in base

Diameter:

4.0

″ (10.2 cm)

installed in B501 base

6.1

″ (15.5 cm)

installed in B501B base

Shipping Weight:

0.3 lbs. (150 g)

Temperature Range:

32

° to 100°F (0° to 38°C)

Humidity Range:

10% to 93% RH noncondensing

Sensitivity

5551B:

135

°F fixed temperature alarm

5551R:

135

°F fixed temperature or

15

° rise per minute

Operating Voltage:

15–32 VDC peak, 6.5 mA

current for visible LEDs latched on

Standby Current:

200

µA

Sensor:

Electronic, dual thermistors

Thermal Sensor Spacing:

UL listed to 50 ft. spacing. Other spacing may be used

depending on ceiling height and other conditions. See

NFPA 72 for more details on spacing requirements.

3

2

1

3

2

1

3

2

1

+

-

-

+

CLASS A OPTIONAL WIRING

REMOTE ANNUNCIATOR

+-

CAUTION: Do not loop wire under terminal 1 or 2.

Break wire run to provide supervision of connections.

500 Series Base

Wiring Diagram