Extron Electronics HRU 109 User Manual
HRB 109 and HRU 109 • Installation Guide
The Extron HRB 109 basic shelf and Extron HRU 109 shelf kit accommodate half-rack,
quarter-rack, and eighth-rack products in a half-rack width installation. The shelves can
accommodate a single device or combinations of smaller devices.
This installation guide describes how to
z Secure A/V products to the shelf.
z Secure a false front panel to the shelf (HRU 109 only).
z Secure the shelf to the rack rails.
Before Starting
Extron does not provide rails for the rack system. These must be purchased separately and
need to be installed (see the user guide provided by the supplier). The distance between
the rails must be half the standard rack width (8.85 inches or 22.48 cm) between the inside
edges of the rails (see the figure below).
1.75"
10.5"
8.85"
9.5"
Figure 1. Dimensions
You will also need a Phillips head screwdriver.
Included Parts
HRB 109 (Basic Shelf)
Half-rack shelf: 9.5 inches (24.1 cm) deep x 10.5 inches (26.7 cm) wide
(width not including mounting flanges 8.85 inches [22.5 cm])
(4) #10-32 rack shelf mounting screw with nylon captive cap washer
(8) #4-40 x 3/16 inch product mounting screw
HRU 109 (Shelf Kit)
Half-rack shelf: 9.5 inches (24.1 cm) deep x 10.5 inches (26.7 cm) wide
(width not including mounting flanges 8.85 inches [22.5 cm])
(4) #10-32 rack shelf mounting screw with nylon captive cap washer
(8) #4-40 x 3/16 inch product mounting screw
1/4-rack false faceplate
1/8-rack false faceplate
1
HRB 109 and HRU 109 • Installation Guide (Continued)
Underwriters Laboratories Guidelines for Rack Mounting
The following Underwriters Laboratories (UL) guidelines are relevant to the safe
installation of products in a rack:
Elevated operating ambient temperature — If a unit is installed in a closed or multi-unit
rack assembly, the operating ambient temperature of the rack environment may be greater
than room ambient temperature. Therefore, install the equipment in an environment
compatible with the maximum ambient temperature specified by Extron.
Reduced air flow — Install the equipment in the rack so that the equipment gets adequate
air flow for safe operation.
Mechanical loading — Mount the equipment in the rack so that uneven mechanical
loading does not create a hazardous condition.
Circuit overloading — Connect the equipment to the supply circuit and consider the effect
that circuit overloading might have on overcurrent protection and supply wiring. Give
appropriate consideration to the equipment nameplate ratings when addressing this
concern.
Reliable earthing (grounding) — Maintain reliable grounding of rack-mounted equipment.
Pay particular attention to supply connections other than direct connections to the branch
circuit (such as the use of power strips).
Secure Devices to the Shelf
TIP: It is easier to secure devices to the shelf before attaching the shelf to the rack.
All rack-mountable Extron devices have two
threaded holes in diagonally opposite corners of
the base plate for mounting onto the shelf.
CAUTION: Some products have hexagonal
holes in their base, which anchor
stand-offs for internal circuit boards
(see the figure to the right). Using these
holes will damage the product and will
not provide secure mounting.
Before securing a device to the shelf, decide where it will be placed. If multiple smaller
devices are to be placed on a single shelf they can be placed at the front of the rack or the
back. Ensure that adequate space remains for running cables.
To mount the device to the shelf, follow these instructions and see figure 2 on the opposite
page:
1. If the device has rubber feet attached, remove them.
2. Place the device on the rack so that the rack mounting holes are aligned with two holes
in the rack.
3. Secure the device to the shelf, using two of the provided 4-40 x 3/16 inch screws.
4. Repeat steps 1 to 3 to install other devices, as desired.
2
Hexagonal Stand-off
(for mounting
circuit board)
#4-40 Thread for
Rack Mounting
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