OSC24VAC


This part is available from http://www.controlshvac.com

 

The OSC24VAC ceiling mount, low profile panoramic  PIR Detector uses a Fresnel lens to provide up to 8 m coverage.

This passive infrared detector is designed to monitor a room and to transmit presence to a BMS via a dry contact
signal. The 24VAC operation makes the OSC24VA 100% compatible with standard BMS voltage system
This detector is suitable for occupancy detection of residential, factories, warehouses and office building.



Technical Specifications


  • 24V AC Operating Voltage
  • Operating current : 18mA. ( 0.4VA at 24VAC)
  • Wall/ceiling installation
  • PVC 2 part twist off
  • Tamper Switch
  • NO or NC alarm contact ( jumper selectable)
  • Maximum coverage detecting distance: 1m to 8m  (up to 24 square meter *)
  • Detecting Angle : 360deg
  • Self-testing start-up time 30 to 60 sec
  • Operation temperature -10C to +50C
  • Alarm indicator: red LED ( can be jumper deactivated)
  • Alarm output: N.C. or N.O AC/DC 28V , 100mA
  • Tamper output: N.C . or N.O.,DC28V, 100mA
  • Coverage axis : 11 far, 8 middle, 5 vicinities
  • Dual infrared sensor
  • Operating Humidity: up to 95 % RH non condensing
  • Anti RF interference: 1OMHz-1 GHz 20V 1m
  • Outline Size: 105mm diameter * 33 mm high ( with base)
  • Installation distance or height: 2.5m to 7m (recommended)




Terminal Block



Relay contacts

The relay output can be normally open (NO) or normally closed  (NC)  by selecting the proper jumper setting

To set the N.C. or  N.O.output type according to the BMC

 

Short 1&2: for  N.O.

Short 2&3 for : N.C.


Default is N.C  (jumper on 2&3)


N.O. is open when no movement is detected

N.C. is closed when no movement is detected


Relay contact are rated at 100ma  28V AC-DC






Tamper contact

Tamper contact is normally closed N.C. when the unit cover is on

Removing the cover will open the contact



LED Jumper

Will enable or disable the LED

 

Short 1&2: for LED on

Short 1&2: for LED Off

 

Default is 1&2


WARNING : When LED is disabled, there will not be any light to show the sensor is working.




Pulse Jumper:


The Pulse jumper is used to adjust the sensitivity and anti- interference

Selecting the numbers of IR pulses required to trigger a valid alarm

(Normally not changed unless detection interference are present.)



Short  1&2 for 1 pulse sensitivity

Short  2&3 for 2 pulse sensitivity

Open (none) for 3 pulse sensitivity

 

Default is 1&2








Testing

After the device is powered up, (If the LED jumper is on position 1&2 the LED indicator will turn on)


IMPORTANT

For proper testing , the lens cover must be fully attached to the base

Testing without the lens cover will not work as the unit initializes itself and adjust the parameter in a learn fonction

 

Step 1

Power the unit


Step 2

Wait for one minute

On power up, the detector will be in self-test for approximately a minute (60 sec.)

After the self-diagnostic is over, the detector will start in normal operating.


Step 3 

Proceed to a walk test as a normal user would need to be detected.

If enabled, the red LED will flash every time it is detecting motion.


BMS hookup


The OSC24VAC can be hooked up to many BMS systems

The most common usage is along with a VAV controller.


Contact to ground

If your VAV controller has a binary input that uses an NO/NC to ground contact for detection of state ( like in figure 1)

You can use the 24VAC from the VAV controller and route the ground signal to one of the the NO or NC contact.

The other side of the relay will return to the VAV controller input.


Set the NO/NC jumper on the OSC24VAC as per required by your BMS equipment

Ensure polarity is respected if your 24VAC power transformer is grounded



Fig. 1


Dry Contact

If your BMS system uses a totally isolated signal that shorts 2 wires that are not connected to the controller ground (like in figure 2)

You will need 4 conductors between the OSC24 and your BMS equipment


2 conductors for the 24VAV

2 conductors for the NO or NC contact

Polarity is irrelevant as the output relay is isolated from the power source.







NOTICE

 

 

This detector should not be used in life threatening detection situation

Please install and use the detector according to this manual

Don't touch the surface of sensor while the lens cover is off as it will affect the sensitivity of the detector.

Please cut power before cleaning

Use a soft cloth with alcohol if cleaning is required

Please user all safety precautions and personal protection while installing.


* Depending on obstacles, ambient lighting interference and radio interferences