model rly-dim-2d installation instructions

This product can be used with LED, ballast, tungsten, and general use loads.
Make sure all connections are in accordance with the National Electrical Code and local regulations.
To reduce the risk of electric shock, disconnect both normal and emergency power supplies before servicing.
This product is intended to be used to control indoor and outdoor located loads.
An unswitched AC power source is required (120-240VAC/ 277VAC).
Do not install near gas or electric heaters.
Do not attempt to service a sealed RLY-DIM-2D unit. If it is malfunctioning, return to the manufacturer, Myers
Power Products, Inc., 44 S. Commerce Way, Bethlehem, PA 18017.
The use of accessory equipment is not recommended by the manufacturer and may cause an unsafe
Do not use this product for other than intended use.
10. Servicing should be performed by qualified service personnel.
11. Equipment should be mounted in locations and at heights where it will not readily be subjected to tampering by
unauthorized personnel.
5-Year Limited Warranty
Myers Power Products warrants to the original purchaser/users for the published warranty period from the date of
shipment that should Myers equipment prove defective by reason of improper workmanship or material, Myers will
repair or replace the same equipment without charge. This warranty does not cover defects or malfunctions arising
from improper installation, operation, repair or neglect, accident, or abuse. Myers will honor its warranty provided the
equipment has not been physically damaged or improperly installed or connected. To obtain warranty/repair within
the warranty period, the defective product should be shipped freight prepaid to the address at the bottom of this
document. To the extent permitted by applicable law, all warranties extending beyond repair or replacement as
described above are disclaimed. This includes implied warranties of merchantability and fitness for a particular
purpose. Where applicable law prohibits disclaimers or the implied warranties of merchantability and fitness, those
warranties are limited to 12 months from date of shipment. Myers provides a 90-day money back guarantee if
equipment does not perform in accordance with the Myers published specifications. The liability of Myers and its
agents under all warranties is limited to repair and replacement as described herein and under no circumstances
shall there be liability for any other kind of loss, damage, or labor—either consequential or for injury to a person or
property or otherwise.
Electrical Specifications
Mechanical Specifications
120-240/277V Sensing Input
20 Amp Ballast Load Rating (120-277V)
20 Amp General Use Rating (120-277V)
1800W Incandescent Load Rating (120V)
1500W Incandescent Load Rating (277V)
Normally Closed Output Contact
Auxiliary N.O. Contact (1A/30VDC)
UL924 Listed (US UL/ CA UL)
Mounts in 4-11/16” Junction Box with Extension Box
Use single gang plaster ring or blank cover
Suitable for installation in the plenum
Tested to UL2043 UL94-5VA Plastic Flame Rating
Shipping Weight: 8 oz Color : White
Temperature: -10°C-60°C (14°F - 140°F)
Flush Mounted Size: 4-1/2” x 2-3/4” x 1/4”
Body Size: 2-7/8” x 1-3/4” x 1-7/32”
rsion 7
Myers Power Products, Inc., 44 S. Commerce Way, Bethlehem, PA 18017
In the past, all emergency lights were left on 24 hours a day to meet safety codes. Now you can specify
and install a UL924 Listed Emergency Power Control, RLY-DIM-2D, which converts up to 20A of
normal light fixtures to approved emergency lights. During normal operation, the RLY-DIM-2D dims
designated emergency lights using the same controls as your normal (non-emergency) lights. During a
utility power interruption, the RLY-DIM-2D turns designated emergency lights on, at full brightness,
regardless of dimmer position. The RLY-DIM-2D is intended for use with switching, 0-10V, and
DALI/EcoSystem dimming controls.
Which Model Do You Need?
0-10V, EcoSystem, or DALI Dimmable Loads
Line Voltage Dimmable Loads
Choose Model
Patented Automatic Diagnostic
When the room switch is turned off, RLY-DIM-2D tests itself for 2.5 seconds, verifying that an emergency
power source is available and that the RLY-DIM-2D, LED drivers, LED arrays, ballast, and lamp(s) are
functioning correctly. This feature eliminates the need for manual monthly testing and is approved for this
purpose. It supports installation in any location because its test switch does not need to be accessible.
This feature can be disabled in the field by cutting the blue jumper.
Inverter or Fire Alarm Remote Test Switch
Some applications demand that emergency lighting be activated upon fire alarm, security alarm, or
remote test switch activation. The RLY-DIM-2D is equipped with a low voltage override input (red jumper).
Contact your local Myers Power Products Sales Representative for more details.
This device can be remotely tested by applying 24VDC to the red jumper wire. Applications include fire
alarm override and inverter monthly testing. Please contact Myers Power Products for application and
wiring details.
The RLY-DIM-2D features a unique universal mounting, which is a single enclosure design that allows
flush, fixture, plenum, or panel mounting, as shown below.
Flush Mount Installation
Junction Box Installation
Fixture Mount Installation
Recommended box size 4-11/16” with
extension (total depth 4”minimum)
Recommended box size 4-11/16” with
extension (total depth 4”minimum).
Tested to UL 2043: suitable for
installation in the plenum.
Confirm body size (2-7/8” x 1-3/4” x 17/32”) will fit in fixture ballast channel
prior to installation.
rsion 7
Myers Power Products, Inc., 44 S. Commerce Way, Bethlehem, PA 18017
In order to install the RLY-DIM-2D in accordance with national/local code requirements, a qualified
electrician should review and understand the installation instructions: Check voltage and current
requirements. Verify and lock out circuit breakers on both regular (utility) power and 24 hours emergency
generator or inverter circuit. Install a self-adhesive 2" x 3" caution label in each fixture or load controlled
by the RLY-DIM-2D cautioning that the load is supplied from two different power sources: normal and
emergency. Review wiring diagram and connect wires, one at a time, in accordance with the numeric
In order to provide a safe light level, when regular power is interrupted, it is recommended that a
minimum 5000 lumen are controlled by a 24 hour emergency circuit and are spaced no farther than 24' in
any direction from each other in a normal 9' white ceiling environment.
Initial Testing and Troubleshooting
In a new installation, where hundreds of devices may be used, each having as many as 14 wires to be
correctly connected, it is important that a fast, convenient method is used to check connections. In order
to test that the wires are connected correctly, without any inconvenience to occupants, do not turn off
regular (utility) power until you have checked each device as follows:
1. Verify that the regular branch circuit breaker is connected and utility power is available. The green
LED should be lit. If the green LED is not lit, check connections and continuity to branch circuit
2. Verify that the emergency branch circuit breaker is connected and emergency power is available. The
red LED should be lit. If the red LED is not lit, check connections and continuity to branch circuit
3. Normal Operation Test: Turn the dimmer or other control device to the “ON” position. Normal and
emergency lights should turn on. Reduce the dimmer to ~50%, normal and emergency lights should
dim together. Turn room switch or control to the “OFF” position. Normal lights should turn off
immediately. If blue loop is connected, emergency lights should stay on for at least 2.5 seconds. If
blue jumper is cut and capped, emergency lights should turn off immediately.
4. Emergency Operation Test: Press and hold test button. Emergency lights should illuminate at full
brightness until test button is released.
No maintenance is required to keep the RLY-DIM-2D functional. However, regular testing should be
performed when the lamps, ballasts, LED drivers, or arrays have been replaced or when remodeling has
taken place.
Single Line Drawings
On a 20 Amp circuit, 1 RLY-DIM-2D can control up
to 20 Amps of emergency lighting load, or 20 RLYDIM-2Ds can each control 1 Amp of emergency
lighting load. One RLY-DIM-2D is required per
switch leg or zone.
Myers Power Products, Inc., 44 S. Commerce Way, Bethlehem, PA 18017
Model RLY-DIM-2D Wiring Diagrams
Wiring Diagram 1 (Suggested)
A common dimmer controls both normal and emergency lighting in a space. Upon loss of normal power, the emergency lighting comes on at full
brightness regardless of dimmer position.
Wiring Diagram 2 (Shunt)
A dedicated dimmer controls emergency lighting in a space. Upon loss of normal power, the emergency lighting comes on at full brightness regardless of
dimmer position.
Frequently Asked Questions
Do I need a separate normal and
emergency ballast/driver?
NO, the emergency light only needs a single ballast/driver. The Normal-Only light(s) shown are separate light fixtures that
you want to control with the same switch, but do not serve as emergency lighting during a power interruption.
Can I use the RLY-DIM-2D with 3-way
Why is my RLY-DIM-2D
This can occur with some dimmers when they do not have enough load on them. Changing to Wiring Diagram #2 should
eliminate this issue. Contact Myers Power Products for further assistance.
rsion 7
Myers Power Products, Inc., 44 S. Commerce Way, Bethlehem, PA 18017
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