RM-PC-ADC On/Off Photocell & Automatic Dimming Photocell
Sensor - Recessed Mount, Low Voltage
SERIES # DESCRIPTION
RM-PC-ADC
ON/OFF & AUTOMATIC DIMMING PHOTOCELL SENSOR -
RECESSED MOUNT, LOW VOLTAGE
TYPICAL APPLICATIONS
• Daylight Harvesting
• Combination On/Off Switching &
Continuous Dimming of 0-10 VDC
Dimmable Ballast
FEATURES
• Full On/Off Control of Lighting
• Automatically Dims/Brightens 0-10
VDC ballasts as daylight changes
• Works as Stand Alone Unit or with
Occupancy Sensor System
• Capable of nding optimum set-point
• Digital Set-Point Control
• Programmable via simple
push-button commands
• Outputs to Power Pack or Lighting
Control System via SPDT Relay
• Dimming sinks up to 20 mA
• Green LED Activity Indicator
• 100 Hour Lamp Burn-in Timer Mode
AVAILABLE OPTIONS
• Dual Zone Control (-DZ)
• Low Temp/Hi Humidity (-LT)
SPECIFICATIONS
• Size: 4.40” (11.18 cm) square
• Sensor Weight: 6 Ounces
• Sensor Color: White
• Mounting: Recessed into a 4” x 4”
square junction box
• Relative Humidity: 20 to 90%
non-condensing
• Operating Temp: 14º to 160º F
(-10° to 71° C)
• Storage Temp: -14º to 160º F
(-26° to 71° C)
• 12 to 24 VAC/VDC Oper. Voltage
• UL, CUL, and Title 24 Compliant
• 5 Year Warranty
• Made in U.S.A.
LOW TEMP/HI HUMIDITY(-LT)
• Conformally coated Circuit Board is
corrosion resistant from moisture
• Operates down to -40º F(-40º C)
TEMP/HUMIDITY
Blank = 14º to 160º F
-LT = -40º to 160º F
T128-001-P
w/ Dual Zone Option!
DUAL ZONE (-DZ) OPTION
Daylight contribution diminishes as the distance from the source (windows) increases.
Therefore lights that are different distances from a window should not be controlled
from the same photocell sensor output. With the Dual Zone (-DZ) option, the RM-
PC-ADC has a second set of outputs that can control an additional zone of lighting.
The option works by using a relative set-point for the second zone that is a selected
percentage higher than the primary zone’s set-point. The percentage is chosen via
the digital push-button controls. A second 0-10 VDC dimming ballast can also be
controlled at a selected level higher as well. The -DZ option is ideal for classrooms
with individually controlled parallel rows of lights.
Model Numbering System: RM-PC-ADC-[DUAL ZONE]-[TEMP/HUMIDITY]
Blank = Single Zone
-DZ = Dual Zone
DUAL ZONE
The RM-PC-ADC Series combines the RM-PC On/Off Photocell sensor with the
RM-ADC Automatic Dimming Control sensor to provide the industry’s most
intelligent control of lighting for daylight harvesting applications. Ideal for public
spaces with windows like vestibules, corridors, or bathrooms; the sensors work
by monitoring daylight conditions in a room, then controlling the lighting so as to
insure that adequate lighting levels are maintained. The RM-PC-ADC can be used
alone or as part of an occupancy sensor system The sensors are powered with 12
to 24 VAC/VDC and typically operate with a PP-20 or MP-20 Power Pack; enabling
complete 20 Amp circuits to be controlled.
DAYLIGHT HARVESTING OPERATION
The sensor controls a 0-10 VDC dimmable ballast to achieve maximum daylight
harvesting while maintaining a minimum light level referred to as the “set-point”.
When no daylight is available, the sensor allows the dimmable ballast to operate at
its full bright level (10 VDC). As daylight increases and begins to contribute to the
overall light level of the room, the Automatic Dimming Control (ADC) feature starts
dimming the ballast proportionally. When sufcient daylight is present to maintain
the set-point without any contribution from the lights, the sensor will switch off the
ballast completely. The lights will remain off until the daylight level drops below the
set-point. At this point, the lights will be turned on with the ballast set at its full dim
level. As the daylight levels fall further, the
ADC feature will again take control of the
ballast; reducing the dim level (increasing the
brightness) in order to achieve the necessary
light level. At the point when all daylight
contribution is gone, the ballast will be back
at its full bright level. To make the series of
adjustments unnoticeable to room occupants,
a 10 to 20% safety factor is maintained to
prevent the system from cycling when the
light level is very near the set-point. There
is also a 20 minute delay before the sensor
switches the lights off to prevent the system
from cycling on a cloudy day; and a 45 second
delay before switching from “Off” to “On”.
AMPLE DAYLIGHT
Set-point
Lights Turn ON Lights Turn OFF
DIMMING RANGE
NO DAYLIGHT
