Concept
Smoke Control Enclosures and Requirements
You must install most of the controls products listed here in an enclosure that meets the following minimum criteria. After the criteria, several specific enclosure models are listed as examples of enclosures that meet the minimum criteria you can use for the smoke control system.
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, Smoke Control Servers 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 Smoke Control 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 listed in the guide 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. To determine the transformer watts used for accumulating total watts consumed in the enclosure, use the following table.
|
Transformer Model # |
Output Rating VA |
Mfg. Model |
Watts in Enclosure |
|
EMSC-541 |
50 |
88-50 |
17.6W |
|
EMSC-542 |
100 |
88-100 |
35.3W |
|
EMSC-543 |
240 |
TR240VA001 X240DAA |
53.4W |
|
EMSC-583 |
75 |
LE11800 120-024-075-2TF-CB |
26.4W |
|
EMSC-616 |
75 |
TR75VA001 X075CAA |
16.6W |
|
EMSC-618 |
96 |
TR100VA001 X100CAA |
21.4W |
|
024-024-040-TF |
40 |
LE10500 024-024-040-1TF |
14.2W |
|
01-2100-323 |
40 |
YD60B-017 E66-40-BW-9920 |
14.2W |
Select the Transformer Model and using the Watts In Enclosure value, add that value to the sum of the Smoke Control and I/O module power ratings.
The transformer Watts In Enclosure values listed here represent the inefficiency of the transformers delivered as heat in the enclosure and include an added margin required for the agency approval at this time.
An Automation Server (AS-SMK), or AS-P (AS-P-SMK) with the following I/O collection is packaged for installation in the smoke control system.
|
Model |
Watts |
|
AS-P Automation Server UI-8-AO-V-4-H DO-FA-12-H UI-16 |
10.0 7.0 1.0 1.8 1.8 |
|
Subtotal EMCS-616 Transformer |
11.6 16.6 |
|
Total Watts |
28.2 Watts (Automation Server) 31.2 Watts (AS-P) |
Because 28.2 Watts multiplied by 160 cu.in. = 4512 cubic inches, this is the minimum enclosure size needed for thermal dissipation with the Automation Server.
Because 31.2 Watts multiplied by 160 cu.in. = 4992 cubic inches, this is the minimum enclosure size needed for thermal dissipation with the AS-P.
An enclosure such as the UNM-SCH242410RC enclosure provides 5760 cubic inches so you can use this size or larger for the application.
An Automation Server (AS-SMK), or AS-P (AS-P-SMK) with the following I/O collection is packaged for installation in the smoke control system.
|
Model |
Watts |
|
AS-P Automation Server UI-8-AO-V-4-H DO-FA-12-H UI-16 AO-8-H AO-V-8-H UI-16 DO-FC-8 UI-8/DO-FC-4-H DI-16 |
10.0 7.0 1.0 1.8 1.8 4.9 0.7 1.8 2.2 1.9 1.6 |
|
Subtotal EMCS-616 Transformer |
24.7 (Automation Server) 27.7 (AS-P) 16.6 |
|
Total Watts |
41.3 Watts (Automation Server) 44.3 Watts (AS-P) |
Because 41.3 Watts multiplied by 160 cu.in. = 6608 cubic inches, this is the minimum enclosure size needed for thermal dissipation with the Automation Server.
Because 44.3 Watts multiplied by 160 cu.in. = 7088 cubic inches, this is the minimum enclosure size needed for thermal dissipation with the AS-P.
An enclosure such as the UNM-SCH243610RC enclosure provides 8640 cubic inches so you can use this size or larger for the application.
If the EIS8-100T Ethernet switch is included in the enclosure with the Smoke Control Servers, it adds 6 watts (nameplate rating on the EIS) to the total equalling 47.3 watts (Automation Server) or 50.3 watts AS-P requiring a minimum of 7568 cubic inches (Automation Server) or 8048 cubic inches (AS-P). That added equipment is still fine within the same enclosure and supports up to 6.7 additional watts (1072 / 160 = 6.7).
When installing the transformer in the enclosure with the electronics, you must position the transformer so a 3-inch vertical space/gap exists between it and the electronics modules. The position must provide a 1-inch horizontal space/gap.
The transformer presents the largest watt element in the power accumulation described here. You may choose to place the transformer(s) in a separate enclosure next to the enclosure holding the Smoke Control and I/O modules and possibly allow a smaller enclosure for the Smoke Control and I/O modules. The minimum size restrictions discussed here are associated with maintaining enclosure internal temperature for the benefit of the Automation Server, AS-P and associated electronics modules. When you use a separate enclosure to house only the transformer(s), it does not need to provide the minimum capacities described here.
Unity Series Enclosures
There are six Unity series general purpose enclosures recommended for use with the SmartStruxure smoke control system. This includes the following models and sizes:
|
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 following figure shows the construction of the UNM-SCH13186RC enclosure.
The next figure shows the larger and stronger UNM-SCH 303610RC 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. Refer to the UL 864 Smoke Control System Enclosure Guide for additional information on the enclosures, their general requirements, and available options.
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 MNA-FLO-1 enclosure.
The MNA-FLO-1 provides knockouts in the positions shown for .50 inch (13 mm) or .75 inch (19 mm) conduit connections.
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.
The UL-ENCL is a small, general purpose enclosure typically used 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.
The 3P-UL-ENCL enclosure is a legacy system enclosure typically 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. This enclosure is not typically 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 VAV controllers listed in this guide. For more information, see MS/TP BACnet Controllers .
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).
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 legacy controller models described in this guide. 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, 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 listed in this guide (40VA up to 100VA) in the enclosure. For more information, see Transformers .
You must position the legacy controller assemblies and accessory electronics devices in the enclosure to provide a minimum vertical space of 1 inch (25 mm) above the transformer and a minimum horizontal space of .50 inch (13 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 (610 mm) x 24 inch (610 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.
SmartStruxure Solution Hardware Overview
MS/TP BACnet Controllers
Network Accessories
UNM-SCH13186RC Enclosure
UNM-SCH181810RC Enclosure
UNM-SCH242410RC Enclosure
UNM-SCH243610RC Enclosure
UNM-SCH303610RC Enclosure
UNM-SCH304810RC Enclosure
MNA-FLO-1 Enclosure
FSCS and FAP Introduction
StruxureWare Building Operation Overview
Transformers