|HVAC Guide Specifications
Outdoor Air-Cooled Liquid Chiller
60 to 390 Tons (210 to 1370 kW) Nominal
80 to 390 Tons (280 to 1370 kW) Nominal with Greenspeed® Intelligence
Carrier Model Number:
Part 1 — General
1.01 SYSTEM DESCRIPTION
Microprocessor controlled, air-cooled liquid chiller for outdoor installation, utilizing scroll compressors, low sound fans and optional hydronic pump system. For units that incorporate Greenspeed intelligence, all fans are controlled with variable speed fan drive motors. Chiller software shall be specifically developed to coordinate optimal fan speed for application conditions and provide refrigerant circuit optimization, resulting in higher part-load efficiency and reduced acoustic levels.
NOTE: Hydronic pump packages are only available on 30RB060-190 units. Hydronic pump packages are not available when optional heat reclaim is selected.
1.02 QUALITY ASSURANCE
A. Unit shall be rated in accordance with AHRI (Air- Conditioning, Heating and Refrigeration Institute) Standard 550/590, latest edition (U.S.A.) and all units shall be ASHRAE (American Society of Heating, Refrigeration, and Air-Conditioning Engineers) 90.1 compliant.
B. Unit construction shall comply with ASHRAE 15 Safety Code, UL (Underwriters Laboratories) latest edition, and ASME (American Society of Mechanical Engineers) applicable codes (U.S.A. codes).
C. Unit shall be manufactured in a facility registered to ISO (International Organization for Standardization) 9001 Manufacturing Quality Standard.
D. Unit shall be full load run tested at the factory.
1.03 DELIVERY, STORAGE AND HANDLING
A. Unit controls shall be capable of withstanding 150 F (66 C) storage temperatures in the control compartment.
B. Unit shall be stored and handled per unit manufacturer's recommendations.
Part 2 — Products
Factory assembled, single-piece or factory-matched duplex chassis, air-cooled liquid chiller. Contained within the unit cabinet shall be all factory wiring, piping, controls, refrigerant charge (R-410A), and special features required prior to field start-up.
B. Materials of Construction:
1. The base rail is industrial-quality, 7ga, zinc-dipped, galvanized frame (with Magni-coated screws).
2. Cabinet shall be galvanized steel casing with a baked enamel powder or pre-painted finish. 3. Cabinet shall be capable of withstanding 500-hour salt spray test in accordance with the ASTM (American Society for Testing and Materials) (U.S.A.) B-117 standard.
1. Condenser fans shall be direct-driven (VFD [variable frequency drive] controlled on units with Greenspeed intelligence), 9-blade airfoil cross-section, reinforced polymer construction, shrouded-axial type, and shall be statically and dynamically balanced with inherent corrosion resistance.
2. The variable speed drives for the condenser fans on 30RB units with Greenspeed intelligence shall include a DC link reactor.
3. Air shall be discharged vertically upward.
4. Fans shall be protected by coated steel wire safety guards.
D. Compressor/Compressor Assembly:
1. Fully hermetic scroll type compressors.
2. Direct drive, 3500 rpm (60 Hz), protected by motor temperature sensors, suction gas cooled motor.
3. External vibration isolation rubber-in-shear.
4. Each compressor shall be equipped with crankcase heaters to minimize oil dilution.
1. Shell-and-tube type, direct expansion.
2. Tubes shall be internally enhanced seamless-copper type rolled into tube sheets.
3. Shall be equipped with Victaulic-type water connections.
4. Shell shall be insulated with 3/4-in. (19-mm) PVC foam (closed-cell) with a maximum K factor of 0.28.
5. Design shall incorporate a minimum of 2 independent direct-expansion refrigerant circuits.
6. Cooler shall be tested and stamped in accordance with ASME Code for a refrigerant working side pressure of 445 psig (3068 kPa). Cooler shall have a maximum water-side pressure of 300 psig (2068 kPa).
7. Cooler shall be provided with a factory-installed flow switch.
1. Coil shall be air-cooled Novation® heat exchanger technology with microchannel (MCHX) coils and shall have a series of flat tubes containing a series of multiple, parallel flow microchannels layered between the refrigerant manifolds. Coils shall consist of a two-pass arrangement. Coil construction shall consist of aluminum alloys for fins, tubes, and manifolds in combination with a corrosion-resistant coating.
2. Tubes shall be cleaned, dehydrated, and sealed.
3. Assembled condenser coils shall be leak tested and pressure tested at 656 psig (4522 kPa).
G. Refrigeration Components:
Refrigerant circuit components shall include replaceable-core filter drier, moisture indicating sight glass, electronic expansion device, discharge service valve and liquid line service valves, and complete operating charge of both refrigerant R-410A and compressor oil.
H. Controls, Safeties, and Diagnostics:
1. Unit controls shall include the following minimum components:
a. Microprocessor with non-volatile memory. Battery backup system shall not be accepted.
b. Separate terminal block for power and controls.
c. Control transformer to serve all controllers, relays, and control components.
d. ON/OFF control switch.
e. Replaceable solid-state controllers.
f. Pressure sensors shall be installed to measure suction and discharge pressure. Thermistors shall be installed to measure cooler entering and leaving fluid temperatures as well as optional heat reclaim condenser entering and leaving fluid temperatures, and refrigerant pump down pressure and temperature.
2. Unit controls shall include the following functions:
a. Automatic circuit lead/lag.
b. Hermetic scroll compressors are maintenance free and protected by an auto-adaptive control that minimizes compressor wear.
c. Capacity control based on leaving chilled fluid temperature and compensated by rate of change of return-fluid temperature with temperature set point accuracy to 0.1° F (0.06° C).
d. Limiting the chilled fluid temperature pulldown rate at start-up to an adjustable range of 0.2° F to 2° F (0.11° C to 1.1° C) per minute to prevent excessive demand spikes at start-up.
e. Seven-day time schedule.
f. Leaving chilled fluid temperature reset from return fluid and outside air temperature.
g. Chilled water pump and optional heat reclaim condenser water pump start/stop control and primary/standby sequencing to ensure equal pump run time.
h. Dual chiller control for parallel chiller applications without addition of hardware modules and control panels (additional thermistors and wells are required).
i. Timed maintenance scheduling to signal maintenance activities for pumps, strainer maintenance and user-defined maintenance activities.
j. Low ambient protection to energize cooler and optional heat reclaim or hydronic system heaters.
k. Periodic pump start to ensure pump seals are properly maintained during off-season periods.
l. Single step demand limit control activated by remote contact closure.
m. Generation of 0 to 10 vdc signal to control 3-way valve position when optional heat reclaim is employed.
n. Nighttime sound mode to reduce the sound of the machine by a user-defined schedule.
a. The control panel shall include, as standard, a scrolling marquee display capable of indicating the safety lockout condition by displaying a code for which an explanation may be scrolled at the display with time and date stamp.
b. Information included for display shall be:
1) Compressor lockout.
2) Loss of charge.
3) Low fluid flow.
4) Cooler coil and optional heat reclaim coil freeze protection.
5) Cooler set point.
6) Optional heat reclaim set point.
7) Chilled water reset parameters.
8) Thermistor and transducer malfunction.
9) Entering and leaving-fluid temperature.
10) Evaporator and condenser pressure.
11) System refrigerant temperatures.
12) Chiller run hours.
13) Compressor run hours.
14) Compressor number of starts.
15) Time of day:
a) Display module, in conjunction with the microprocessor, must also be capable of displaying the output (results) of a service test. Service test shall verify operation of every switch, thermistor, fan, and compressor before chiller is started.
b) Diagnostics shall include the ability to review a list of the 30 most recent alarms with clear language descriptions of the alarm event. Display of alarm codes without the ability for clear language descriptions shall be prohibited.
c) An alarm history buffer shall allow the user to store no less than 30 alarm events with clear language descriptions, time and date stamp event entry.
d) The chiller controller shall include multiple connection ports for communicating with the local equipment network, the Carrier Comfort Network® (CCN) system and access to chiller control functions from any point on the chiller.
e) The control system shall allow software upgrade without the need for new hardware modules.
16) Crankcase heater failure.
a. Unit shall be equipped with thermistors and all necessary components in conjunction with the control system to provide the unit with the following protections:
1) Loss of refrigerant charge.
2) Reverse rotation.
3) Low chilled fluid temperature.
4) Thermal overload.
5) High pressure.
6) Electrical overload.
7) High heat reclaim leaving fluid temperature.
b. Condenser fan and factory pump motors shall have external overcurrent protection.
I. Operating Characteristics:
1. Unit shall be capable of starting and running at outdoor ambient temperatures from 32 F to 125 F (0° to 52 C) for all sizes.
2. Unit shall be capable of starting up with 95 F (35 C) entering fluid temperature to the cooler.
Condenser-fan motors shall be totally enclosed single-speed, 3-phase type with permanently lubricated bearings and Class F insulation.
K. Electrical Requirements:
1. Unit/module primary electrical power supply shall enter the unit at a single location (some chiller voltage/size combinations require 2 power supplies).
2. Unit shall operate on 3-phase power at the voltage shown in the equipment schedule.
3. Control points shall be accessed through terminal block.
4. Unit shall be shipped with factory control and power wiring installed.
L. Chilled Water Circuit:
1. Chilled water circuit shall be rated for 300 psig (2068 kPa). Units with optional pump package are rated for 150 psig (1034 kPa) working pressure.
2. Thermal dispersion proof of flow switch shall be factory installed and wired.
3. Optional hydronic package:
a. With or without VFD (variable frequency drive) (30RB060-190 units only):
1) Field pipe connections shall be Victaulic type.
2) Optional single or primary/standby operation pump systems. Dual pump systems shall have a pump discharge check valve.
3) Pumps shall be vertical in-line, single stage design, and capable of being serviced without disturbing piping connections.
a) Pump casing shall be of class 30 cast iron.
b) The impeller shall be of cast bronze, closed type, dynamically balanced, keyed to the shaft and secured by locking cap screw.
c) The hydronic kit will be provided with a flush line connection to ensure lubrication at the seal face and allow for positive venting of the seal chamber.
d) Each port shall be fitted with an isolation valve that allow the units to operate in parallel or standby, yet may be used to isolate one pumping unit for servicing or removal with the other pump still running.
e) Pump shall be rated for 150 psig (1034 kPa) working pressure.
f) The pump case shall have gage tappings at the suction and discharge nozzles and include drain ports.
g) Dual pumps shall allow for the servicing of one pump without draining the chilled water loop.
h) Motors shall be premium efficiency, totally enclosed fan cooled (TEFC) 3-phase type with grease lubricated ball bearings.
i) Each pump shall be factory tested per Hydraulic Institute Standards.
4) Pressure/temperature taps (3) shall be factory installed to measure the pressure differential across the pump and across the strainer.
5) Combination valve (which includes check, isolation, and modulation) shall be factory installed. Pressure/temperature taps (2) shall be factory installed to measure the pressure differential across the combination valve.
6) Hydronic assembly shall have factory-supplied electric freeze protection to –20 F (–29 C).
7) Piping shall be Schedule 40 black steel.
8) Cast iron or ductile iron body 1/8-in. perforated strainer. A factory-installed, removable fine mesh start-up strainer for initial run period shall be included. The start-up strainer must be removed within 24 hours after chiller start-up.
b. With VFD (these comments are applicable in addition to the comments in section a when the VFD hydronic package is employed [30RB060-190 units only]):
1) The drive shall be of the VVC-PWM (voltage vector control - pulse with modulation) type, providing near unity displacement power factor without the need for external power factor correction capacitors at all loads and speeds.
2) The drive and motor protection shall include; motor phase to ground fault, loss of supply phase, over voltage, under voltage, motor over temperature, inverter overload, over current. Over current is not allowed, ensuring hydronic units will not overload the motor at any point in the operating range of the unit.
3) Sensorless control software shall be available in the hydronic unit to provide automatic speed control without the need for pump mounted (internal/external) or remotely mounted differential pressure system feedback sensors. Control mode setting and minimum/maximum head set points shall be set at the factory and be user adjustable via the programming interface.
4) The integrated control shall incorporate an integrated graphical user interface that shall provide running and diagnostic information and identify faults and status in clear English language. Faults shall be logged/recorded for review at a later date. It shall be possible to upload parameters from one drive into the nonvolatile memory of a computer and download the parameters into other drives requiring the same settings. The key pad shall incorporate Hand-Off-Auto pushbuttons to enable switching between BMS (Building Management System) and manual control. The drive shall incorporate a USB port for direct connection to a PC and an RS485 connection with Modbus RTU protocol. Optional protocols available should include BACnet and LonWorks.
5) The control shall have the following additional features: Sensorless override for BMS, manual pump control or closed loop PID control; programmable skip frequencies and adjustable switching frequency for noise/vibration control; auto alarm reset; motor preheat function; six programmable digital inputs; two analog inputs; one programmable analog/digital output; two volt-free contacts.
6) The hydronic unit shall be capable of operating in any of the following control modes:
a) Duty pump and standby pumps with Sensorless control
b) Duty pump and standby pumps with remote sensor or building system (BAS) control.
M. Special Features:
Certain standard features are not applicable when the features designated by * are specified. For assistance in amending the specifications, contact your Carrier representative.
1. High-efficiency variable condenser fans:
All fans on the unit shall have variable speed fan motors to provide higher part load efficiency and reduced acoustic levels. Each fan circuit shall have a factory-installed, independent variable speed drive with display. Variable speed drives are rated IP-55 enclosures and UL Listed. The use of this option, with the addition of antifreeze in the cooler circuit and wind baffles, shall allow running with outdoor ambient temperatures down to –20 F (–28.9 C). This option is not available with sizes 060 and 070, and it is not available in combination with low ambient head pressure control.
* 2. Low Ambient Head Pressure Control:
Unit shall be capable of running at outdoor ambient temperatures down to –20 F (–29 C) with the addition of antifreeze in the cooler circuit, wind baffles, and field-installed or factory-installed solid-state head pressure control with condenser coil minimum step capacity temperature sensor. This option or accessory is neither required nor available with the high-efficiency variable condenser fan option.
3. Unit-Mounted Non-Fused Disconnect:
Unit shall be supplied with factory-installed, non-fused electrical disconnect for main power supply. This option is not available on 30RB060-120 with dual point power. This option is included with the high SCCR option.
4. Optional Condenser Coil Materials:
a. E-coated microchannel coils:
E-coated aluminum microchannel coil shall have a flexible epoxy polymer coating uniformly applied to all coil external surface areas without material bridging between fins or louvers. Coating process shall ensure complete coil encapsulation, including all exposed fin edges. E-coat shall have a thickness of 0.8 to 1.2 mil with top coat having a uniform dry film thickness from 1.0 to 2.0 mil on all external coil surface areas including fin edges. E-coated coils shall have superior hardness characteristics of 2H per ASTM D3363-00 and cross hatch adhesion of 4B-5B per ASTM D3359-02. Impact resistance shall be up to 160 in./lb (ASTM D2794-93). E-coated coil shall have superior impact resistance with no cracking, chipping, or peeling per NSF/ANSI 51-2002 Method 10.2. E-coated aluminum microchannel coils shall be capable of withstanding an 8000-hour salt spray test in accordance with the ASTM (American Society for Testing and Materials) (U.S.A.) B-117 Standard.
b. Aluminum fin/copper tube coils:
Coil shall be constructed of seamless copper tubes mechanically bonded to aluminum fins. Fins shall have wavy enhancements. These condenser coils are recommended with remote cooler applications. These coils are not recommended for corrosive environments.
c. Pre-coated aluminum-fin coils:
Coil shall have a durable epoxy-phenolic coating to provide protection in mildly corrosive coastal environments. Coating shall be applied to the aluminum fin stock prior to the fin stamping process to create an inert barrier between the aluminum fin and copper tube. Epoxy-phenolic barrier shall minimize galvanic action between dissimilar metals.
d. Copper-fin coils:
Coil shall be constructed of copper fins mechanically bonded to copper tubes and copper tube sheets. Galvanized steel tube sheets shall not be acceptable. A polymer strip shall prevent coil assembly from contacting sheet metal coil pan to minimize potential for galvanic corrosion between the coil and pan. All-copper construction shall provide protection in moderate coastal applications.
e. E-coated aluminum-fin coils:
Coil shall have a flexible epoxy polymer coating uniformly applied to all coil surface areas without material bridging between fins. Coating process shall ensure complete coil encapsulation. Color shall be high gloss black with gloss — 60° of 65 to 90% per ASTM ID523-89. Uniform dry film thickness from 0.8 to 1.2 mil on all surface areas including fin edges. Superior hardness characteristics of 2H per ASTM D3363-92A and cross hatch adhesion of 4B-5B per ASTM D3359-93. Impact resistance shall be up to 160 in./lb (ASTM D2794-93). Humidity and water immersion resistance shall be up to minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM D870-92). Corrosion durability shall be confirmed through testing to no less than 3000 hours salt spray per ASTM B117-90. Coil construction shall be aluminum fins mechanically bonded to copper tubes.
f. E-coated copper-fin coils:
Coil shall have a flexible epoxy polymer coating uniformly applied to all coil surface areas without material bridging between fins. Coating process shall ensure complete coil encapsulation. Color shall be high gloss black with gloss — 60° of 65 to 90% per ASTM D523-89. Uniform dry film thickness from 0.8 to 1.2 mil on all surface areas including fin edges. Superior hardness characteristics of 2H per ASTM D3363-92A and cross hatch adhesion of 4B-5B per ASTM D3359-93. Impact resistance shall be up to 160 in./lb (ASTM D2794-93). Humidity and water immersion resistance shall be up to minimum 1000 and 250 hours respectively (ASTM D2247-92 and ASTM D870-92). Corrosion durability shall be confirmed through testing to no less than 3000 hours salt spray per ASTM B117-90. Coil construction shall be copper-fins mechanically bonded to copper tube sheets. Galvanized steel tube sheets shall not be acceptable. A polymer strip shall prevent coil assembly from contacting sheet metal coil pan to maintain coating integrity and minimize corrosion potential between the coil and pan.
5. Optional Heat Reclaim Condenser:
a. Condenser shall be capable of full heat recovery.
b. Condenser shall be water cooled, with Victaulic piping connections.
c. Condenser shall be flooded, shell and tube type, with mechanically cleanable tubes and removable heads.
d. Shell shall be insulated with 3/4 in. (19 mm) PVC foam (closed cell) with a maximum K factor of 0.28.
e. Tubes shall be internally enhanced, seamless copper type, rolled into tube sheets.
f. Condenser shall be tested and stamped in accordance with ASME Code for a refrigerant working pressure of 656 psig (4522 kPa). The condenser shall have a maximum water-side pressure of 300 psig (2068 kPa).
g. Condenser shall be leak and pressure tested at 722 psig (4977 kPa).
h. Condenser design shall incorporate 2 independent refrigerant circuits.
i. Condenser shall have a factory-installed and wired thermistor in both the entering and leaving nozzles, as well as a factory-installed and wired flow switch.
j. Condenser shall be equipped with a heater which is controlled by the chiller.
k. Condenser shall control the return (entering) hot water temperature.
l. Condenser shall have a vent and drain.
m. Condenser shall have a relief valve per circuit (2 total).
NOTE: When a heat reclaim condenser is specified, the air-cooled condenser coils must be either MCHX or e-coated MCHX type.
6. Remote Enhanced Display:
Unit shall be supplied with indoor-mounted, remote, 40-character per line, 16-line display panel for field installation.
7. Chillervisor System Manager Multi-Unit Control:
Field-installed control shall sequence between 2 and 8 chillers in parallel in a single system.
8. Minimum Load Control:
Unit shall be equipped with factory (or field) installed, microprocessor-controlled, minimum load control that shall permit unit operation down to a minimum of 6% capacity (varies with unit size). This option/accessory is not available on applications with leaving fluid temperature less than 38 F (3.3 C).
9. Energy Management Control Module:
A factory or field-installed module shall provide the following energy management capabilities: 4 to 20 mA signals for leaving fluid temperature reset, cooling set point reset or demand limit control; 2-step demand limit control (from 0% to 100%) activated by a remote contact closure; and discrete input for “Ice Done” indication for ice storage system interface.
10. Condenser Coil Trim Panels and Security Grilles:
Unit shall be supplied with factory or field-installed coil covers and painted grilles to protect the condenser coil and internal chiller components from physical damage.
11. Upper Hail Guard:
Unit shall be equipped with a factory-installed option consisting of louvered panels on the ends of the machine which firmly fasten to the machine frame. These panels shall cover the unit from the top to the bottom of the coils, thus providing protection of the coils from hail damage.
12. Full Hail Guard:
Unit shall be equipped with field-installed accessory consisting of hinged, louvered panels, which cover both ends of the unit. This accessory provides complete protection from hail.
13. Full End Screen:
Unit shall be equipped with a factory-installed option consisting of louvered panels that cover the machine ends from top to bottom and firmly fasten to the machine frame. These end screens function as a privacy screen and also provide hail protection.
14. BACnet Communication Option:
Shall provide pre-programmed factory-installed communication capability with a BACnet MS/TP network. Allows integration with i-Vu® Open control system or a third-party BACnet building automation system. No field programming shall be required.
15. BACnet/Modbus Translator Control:
Unit shall be supplied with factory or field-installed interface between the chiller and a BACnet Local Area Network (LAN, i.e., MS/TP EIA-485). Field programming shall be required.
16. LON Translator Control:
Unit shall be supplied with factory or field-installed interface between the chiller and a Local Operating Network (LON, i.e., LonWorks FT-10A ANSI/EIA-709.1). Field programming is required.
17. Navigator™ Hand Held Display:
a. Portable hand held display module with a minimum of 4 lines and 20 characters per line, of clear English, Spanish, Portuguese or French language.
b. Display menus shall provide clear language descriptions of all menu items, operating modes, configuration points and alarm diagnostics. Reference to factory codes shall not be accepted.
c. RJ-14 connection plug shall allow display module to be connected to factory-installed receptacle.
d. Industrial grade coiled extension cord shall allow the display module to be moved around the chiller.
e. Magnets shall hold the display module to any sheet metal panel to allow hands-free operation.
f. Display module shall have NEMA (National Electrical Manufacturers Association) 4x housing suitable for use in outdoor environments.
g. Display shall have back light and contrast adjustment for easy viewing in bright sunlight or night conditions.
h. Raised surface buttons with positive tactile response.
18. Touch Pilot™ Display:
Unit shall be supplied with a remote mount touch screen display for network attachment to the chiller.
19. Compressor Suction Service Valve:
Standard refrigerant discharge isolation and liquid valves shall enable service personnel to store the refrigerant charge in the cooler or condenser during servicing. This factory-installed option (one valve per refrigerant circuit) shall allow for further isolation of the compressor from the cooler vessel.
20. Suction Line Insulation:
Insulation shall be tubular closed-cell insulation. This option shall be required on applications with leaving fluid temperatures below 30 F (–1.1 C) and recommended for areas of high dewpoints where condensation may be a concern.
21. Freeze Protection Cooler Heaters:
Cooler heaters shall provide protection from cooler freeze-up to –20 F (–29 C).
22. Remote Cooler Kit:
Shall allow remote installation of cooler. Kit shall include expansion valve and flow switch cable extensions, and instructions.
23. CRN Cooler (Canada Only):
Shall provide minor cooler modifications to meet Canadian code.
24. Service Option:
The service option shall provide a remote service port for Navigator connection and a factory-installed convenience outlet which includes 4-amp GFI (ground fault interrupt) receptacle with independent fuse protection. Convenience outlet shall be a 115-v female receptacle. Service option shall not be available with 380-v.
25. Compressor Sound Reduction:
Shall provide sound reduction for the scroll compressors.
a. Unit shall be equipped with factory-installed option low sound - compressor sound reduction blanket which reduces unit sound levels by providing an acoustic blanket on each compressor.
b. Unit shall be equipped with factory-installed option ultra low sound - compressor sound reduction enclosure which provides an enclosure to encase each compressor that is covered with an acoustic blanket.
26. High SCCR (Short Circuit Current Rating):
The optional high SCCR (short circuit current rating) device shall allow the chiller to tolerate a 65 kA (208/230 and 460-v units) or 25 kA (575-v units) short circuit current for a brief period of time while protecting downstream components. The high SCCR option shall provide a higher level of protection than the standard unit. This option is not available on 30RB060-120 units with dual-point power. This option is also not available for 30RB170 and 30RB190 208/230-v single point models and 30RB275 and 30RB300 208/330-v dual point models. This option includes the unit-mounted non-fused disconnect option.
27. Dual Chiller Accessory Kit:
For dual chiller applications (with untis piped in parallel), unit shall be provided with the additional hardware (thermistors, wells, connectors) required for proper system operation.
28. GFI Convenience Outlet:
Shall be field installed and mounted with easily accessible 115-v female receptacle and shall include a 4-amp GFI receptacle. This device is not available with 380-v units.
29. Seismic Certification:
A seismic kit is available which will result in a unit SDS (seismic design acceleration parameter) level of 2.0.