How to
Mounting a UL 864 Smoke Control Enclosure
You mount UL 864 Smoke Control enclosures on any hard surface, such as metal, wood, brick, mortar, and thin drywall (hollow wall). Be sure to always mount the enclosure indoors.
The enclosures you use in the SmartStruxure Solution smoke control system must meet the following minimum criteria.
Any enclosures you use to house controllers and products participating in the smoke control system must be UL Listed under one of the following UL Standards:
UL 50 Enclosures for Electrical Equipment
UL 508 Industrial Control Panels
UL 864 Control Units and Accessories for Fire Alarm Systems
Compliance with one of those standards will regulate the dimensions of the enclosures sides (height, width, depth), the gauge of metal used to produce the enclosure and the strengthening/forming of the metal necessary for the gauge metal used.
The enclosures you use for the PS-24V, Automation Server (AS-SMK), AS-P (AS-P-SMK) and the I/O modules must also provide a minimum metal surface area based on the power (watts) being dissipated inside the enclosure.
The metal enclosure you select must provide a minimum of 160 cubic inches for each watt of power being dissipated in the enclosure. For example, an enclosure that measures 24 inches High (610 mm) x 24 inches Wide (610 mm) x 10 inches Deep (254 mm) provides 5760 cubic inches. Dividing 5760 by 160 produces a value of 36 watts.
For the 24x24x10 size enclosure, the sum of the name plate power ratings for the Automation Server (AS-SMK), AS-P (AS-P-SMK) and I/O modules must not exceed the 36 watts value. You must also include any accessory items such as an EIS series Ethernet Switch (6W for Copper version and 10W for Fiber version) and the 24 VAC power transformer.
The approved 24 VAC transformers have output ratings ranging from 40 VA to 240 VA. The efficiency of the transformer determines the amount of that maximum load VA that will be dissipated in the enclosure as heat.
For more information, see Smoke Control Enclosures and Requirements .
For more information, see Transformers .
Recommended Enclosures
The following enclosure models are recommended for use with the SmartStruxure Solution smoke control system.
Warning
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Unintended equipment operation Equipment Damage Be sure to install the smoke control system enclosures inside a protected property, such as a building. They are not designed to be installed outside. Failure to observe this precaution can result in personal injury or equipment damage. Failure to follow these instructions can result in death, serious injury, or equipment damage. |
There are six Unity series enclosures recommended here.
|
Model Number |
Material |
Width |
Height |
Depth |
Volume Cubic Inches |
|
UNM-SCH13186RC |
16gaCRS |
13 in (330 mm) |
18 in (457 mm) |
6 in (152 mm) |
1410 (23,105 cm) |
|
UNM-SCH181810RC |
16gaCRS |
18 in (457 mm) |
18 in (457 mm) |
10 in (254 mm) |
3240 (53,094 cm) |
|
UNM-SCH242410RC |
16gaCRS |
24 in (610 mm) |
24 in (610 mm) |
10 in (254 mm) |
5760 (94,389 cm) |
|
UNM-SCH243610RC |
16gaCRS |
24 in (610 mm) |
36 in (914 mm) |
10 in (254 mm) |
8640 (141,584 cm) |
|
UNM-SCH303610RC |
14gaCRS |
30 in (762 mm) |
36 in (914 mm) |
10 in (254 mm) |
10800 (176,980 cm) |
|
UNM-SCH304810RC |
14gaCRS |
30 in (762 mm) |
48 in (1219 mm) |
10 in (254 mm) |
14400 (235,973 cm) |
The Unity models are designed for wall mounting. For more information, see Mounting a UL 864 Smoke Control Enclosure .
The figure that follows shows the construction of the UNM-SCH13186RC enclosure. For more information, see UNM-SCH13186RC Enclosure .
The next figure shows the larger and stronger UNM-SCH 303610RC enclosure. For more information, see UNM-SCH303610RC Enclosure .
The construction here is typical of the other UNM models UNM-SCH181810RC through UNM-SCH304810RC.
The UNM series enclosures do not have predefined knockout locations. You may punch conduit connection holes on any of the four sides (top, bottom, left, or right).
Ensure that the power limited wiring in the enclosure is separated from the non-power limited wiring, such as the line voltage to the transformers and possible Digital Output relay output control wiring.
The Unity series enclosures have been in wide use for a number of years with the Continuum series controllers. The six Unity enclosure models referenced here are now approved for use with smoke control systems for housing the documented legacy controller models. These enclosures provide additional space for the controllers, accessories, and the segregation and routing of controller wiring.
When used with the b3, b-Link and other referenced accessory items, be sure to select the enclosure size that achieves a metal enclosed volume of 71 cubic inches (or larger) per watt using the accumulated ratings for the controller devices. You can include one of the transformers (40VA up to 100VA) described previously in the enclosure.
You must position the legacy controller assemblies and accessory electronics devices in the enclosure to provide a minimum vertical space of 1 inch (25.4 mm) above the transformer and a minimum horizontal space of .50 inch (12.7 mm) between the transformer and the electronics.
As an example, consider the following legacy application.
The most commonly used model UNM-SCH242410RC enclosure provides a 24 inch (609.59 mm) x 24 inch (609.59 mm) x 10 inch (254 mm) size that you can use to house a b3920 controller along with the two supported xP expansion modules. The controller is 45VA and the expansion is 6VA (maximum for the two xP modules) giving a total of 51VA. This delivers 123 cubic inches per watt which exceeds the 71 cubic inch minimum.
The MNA-FLO-1 is a small enclosure designed for mounting over the damper shaft and fastening to the VAV box panel. The MNA-FLO-1 accomodates the internal mounting of VAV controllers, such as the b3865-V-S, b3866-V-S, b3885-V-S, MNB-V1-2 and MNB-V2-2. The following figure shows the dimensions of the MNA-FLO-1 enclosure.
The MNA-FLO-1 provides knockouts in the positions shown for .50 inches (13 mm) or .75 inches (19 mm) conduit connections.
For more information, see MNA-FLO-1 Enclosure .
The MNB-300-ENC is a small enclosure designed specifically to house the MNB-300 controller. You can mount this enclosure on a wall or panel. Four integrated mounting studs are provided in the base for attaching the MNB-300.
Conduit connections are supported with two knockouts along the top and bottom of the unit. Each knockout provides a double size supporting a 0.875 inch (22 mm) hole for .50 inch (13 mm) conduit, or a 1.125 inch (28 mm) hole for .75 inch (19 mm) conduit.
Typically, the UL-ENCL is a small enclosure you use with b3 series controllers. This enclosure is 19 inches (483 mm) high, 15 inches (381 mm) wide, and approximately 4 inches (102 mm) deep, including a 3 inch (76 mm) base with a two tiered door. Vent louvres are provided on the left and right sides of the enclosure.
You can wall mount this enclosure using the two key slot holes (.28 inch (7 mm) x .50 inch (13 mm)) along the top of the enclosure and two .28 inch (7 mm) along the bottom of the enclosure.
The UL-ENCL enclosure does not feature a DIN rail. Instead, you mount controllers and expansion modules using screws fastened through the pre-drilled backplate. A key lock and a tamper switch are also provided for added security. The enclosure provides space to accommodate controller and power transformer mounting.
For conduit connections, 1.65 inch (42 mm) knockouts are available on the right (2), left (1), top (2), bottom (2) and rear (2).
Ensure that the power limited wiring in the enclosure is separated from the non-power limited wiring, such as the line voltage to the transformer and possible relay output control wiring. The minimum separation is .25 inch (6 mm).
The I2-ENCL-S enclosure is the same design and is used for the same applications as the model UL-ENCL enclosure described previously. The model UL-ENCL replaces the I2-ENCL-S enclosure. However, you may encounter existing I2-ENCL-S enclosures when upgrading an existing system to a SmartStruxure Solution smoke control system. The continued use of the I2-ENCL-S enclosure is approved in the SmartStruxure system.
Typically, the 3P-UL-ENCL enclosure is a legacy system enclosure used with Continuum DIN rail mounted controller products. The enclosure measures 36 inches (913 mm) x 24 inches (610 mm) x 6.5 inches (165 mm) (Height x Width x Depth) and provides 3 DIN rails that you can use for mounting the power supply, controller and I/O modules. Generally, the Unity series enclosures are used for new system installations, but the 3P-UL-ENCL is also approved for use in the SmartStruxure smoke control system.
The VAV-ENCL-S is a small enclosure specifically designed for b3 VAV controllers such the b3865-S and b3866-S. Typically, this enclosure is not sold with new systems. However, you may frequently encounter it when upgrading previous systems to the SmartStruxure Solution smoke control system.
This enclosure is approved for use with the earlier b3 series VAV controllers. You can also use this enclosure when changing to any of the other listed VAV controllers. Refer to the SmartStruxure Solution Smoke Control Design Guide for more information.
This enclosure is 14.25 inches (362 mm) high, 12.3 inches (312 mm) wide, and approximately 4 inches (102 mm) deep. A .88 inch (22 mm) hole is provided in the rear for insertion of the VAV damper shaft and mating with the VAV actuator collar. For conduit connections, three knockouts are provided on the bottom and one on the right of the unit.
Ensure that the power limited wiring in the enclosure is separated from the non-power limited wiring, such as the line voltage to the transformer and the relay output control wiring. The minimum separation is .25 inch (6 mm).
Refer to these mounting dimension drawings before mounting the UL 864 smoke control enclosures:
For more information, see MNA-FLO-1 Enclosure .
For more information, see UNM-SCH13186RC Enclosure .
For more information, see UNM-SCH181810RC Enclosure .
For more information, see UNM-SCH242410RC Enclosure .
For more information, see UNM-SCH243610RC Enclosure .
For more information, see UNM-SCH303610RC Enclosure .
For more information, see UNM-SCH304810RC Enclosure .
Be sure you have the proper diameter mounting hardware and anchoring system. For more information, see UL 864 Smoke Control Enclosure Mounting Hardware .
Check the hardware manufacturer's maximum recommended weight-bearing loads before choosing your mounting hardware.
Find a suitable location and surface on which to mount your enclosure.
Position the enclosure in a vertical (portrait) orientation with the keyhole-shaped mounting holes at the top.
Drill two mounting holes intended for the top two screws (or anchors). Ensure that the holes are spaced apart according to the precise width at the top of the enclosure.
Refer to the mounting dimension graphics.
Install the screws (or anchors) in the holes, leaving just enough distance between the head of the mounting hardware and the wall to accommodate the enclosure material thickness.
Slip the heads of the mounted screws (or anchors) through the two keyhole slots at the top of the enclosure.
Tighten the two screws (or anchors).
Screw in and tighten the two bottom screws (or anchors) into the slots at the bottom of the enclosure.
UL 864 Smoke Control Enclosure Mounting Hardware
MNA-FLO-1 Enclosure
UNM-SCH13186RC Enclosure
UNM-SCH181810RC Enclosure
UNM-SCH242410RC Enclosure
UNM-SCH243610RC Enclosure
UNM-SCH303610RC Enclosure
UNM-SCH304810RC Enclosure