Siemens OP121 User Manual

A6V10281367_d_en_--
SIEMENS Industry, Inc.
2021-12-17
Smart Infrastructure
Installation Instructions
Models OP121/OH121
Photoelectric Smoke Detector
Photo Smoke/Thermal Detector
UL268 7th edition listed
Figure 1 Figure 2
OP121 OH121
Photoelectric Smoke Detector Photo Smoke/Thermal Detector
These
instructions are written in accordance with the
installation guidelines of NFPA 72, National Fire Alarm
Code, and CAN/ULC-
S524, The Installation of Fire Alarm
Systems.
AIR CURRENTS
Before a detector can sense a fire, the products of
combustion or smoke mu
st travel from the fire to the
detector. This travel is especially influenced by air
currents; therefore, consider air movement when
designing the system. While combustion products tend
to rise, drafts from hallways, air diffusers, fans, etc., may
help or
hinder the travel of combustion products to the
detector. When positioning a detector at a particular
location, give consideration to windows and doors, both
open and closed, and to other factors influencing air
movement. Do not install a detector in the a
ir stream of
a room air supply diffuser. It is better to position a
detector closer to an air return.
SPECIFICATIONS
Environmental
Operating Temperature:
32 °F (0 °C) to 100 °F (38
°
C)
Humidity: Up to 95 % RH, non-condensing
Air Pressure: No effect
Air Velocity:
 Open area protection: 0 - 300 ft/min
 Duct application: 300 - 4000 ft/min
Alarm Temperature (model OH121): 135 °F (57 °C)
UL listed with STI Mechanical Protection Guard Model:
STI-9604 (see www.sti-usa.com for details)
Electrical
Voltage: 16-27 VDC
Ripple: 3 V peak-to-peak
Supervisory Current: 100 μA max
Alarm Current: 30-50 mA
Start-up Time: 30 seconds max
DO NOT install this detection device until all
construction is completed.
DO NOT store this detection device where it can be
contaminated by dirt, dust, or humidity.
DETECTOR PLACEMENT
For a clean air application, use 30-
foot center spacing
(900 sq ft) from NFPA Standard 72 initiating devices
chapter and CAN/ULC-S524 as a
starting point for a
detector installation layout. This spacing, however, is
based on ideal conditions –
smooth ceiling, no air
movement, and no physical obstructions. In some
applications, considerably less area is protected
adequately by each smoke detec
tor. In all installations,
place the detector on the ceiling, a minimum of 6
inches
from a side wall, or on a wall, 12 inches from the ceiling.
Follow the drawings provided or approved by Siemens
Industry, Inc. or by its authorized distributors. See
NFPA 72, National Fire Alarm Code, initiating devices
chapter for additional guidance on special issues such
as beamed construction and high stockpiling.
TO AVOID NUISANCE ALARMS
Do not
locate the detectors where excessive smoke
concentrations exist under normal conditions, or in areas
of prolonged high relative humidity where condensation
occurs.
Do not
locate the detectors next to an oil burner, or
garage where exhaust fumes can trigg
er an alarm. Other
causes of false alarms are dust accumulation, heavy
concentrations of steam, heavy pipe or cigar smoke, and
certain aerosol sprays.

Siemens OP121 Specifications

General

Brand	Siemens
Model	OP121
Category	Smoke Alarm
Language	English

Summary

Installation Instructions

Detector Placement

Guidelines for positioning smoke detectors for optimal coverage and performance.

To Avoid Nuisance Alarms

Recommendations for preventing false alarms from environmental factors like smoke, humidity, or exhaust.

Air Currents

Considerations for air movement that can affect smoke detection speed and accuracy.

Specifications

Environmental

Operating temperature, humidity, air pressure, and velocity limits for the detector.

Electrical

Voltage, current, and start-up time requirements for the detector's electrical connections.

Wiring and Installation

Wiring Diagram and Connections

Instructions and diagrams for connecting detectors to control units and remote devices.

Detector Mounting

Procedures for securely installing and removing the detector from its base.

Do Not Paint

Warning against painting the detector, which can impair its function.

LED Indicator Operation

Explanation of the detector's LED colors and flash patterns indicating status and alarms.

Testing and Configuration

Flashing at Start-up

Describes initial LED indicator behavior during the first 180 seconds after power-up.

Sensitivity and Functional Tests

Procedures for testing detector sensitivity and overall functional operation.

Detector Configuration

Details on changing detector settings using the magnetic switch for different applications.

Magnetic Switch Logic

How the magnetic switch controls alarm detection, faults, and configuration confirmation.

Equipment Compatibility and Compliance

Compatible Control Equipment

Lists control equipment models compatible with the detectors and their wiring instructions.

FCC Statement

Regulatory information regarding radio frequency emissions and interference compliance.