RCT Expeditionary ECU - 11 April 2025.pdf

BEAR ENVIRONMENTAL CONTROL UNIT (ECU)

REQUIREMENTS CORRELATION TABLE

11 April 2025

SYSTEMS CAPABILITIES

AND CHARACTERISTICS THRESHOLD OBJECTIVE

1. DESIGN /

CONSTRUCTION

a. System Design* System shall be designed/configured to provide cooling with traditional compressor and associated components (condenser, evaporator, etc.). The system design will be a Heat Pump

Same

b. Maximum Size* Dimensions shall be in accordance with the two shipping configurations listed below:

1) Air configuration; 12 ECUs per a single standard 463L pallet, usable cube 104” X 84” X

96”

2) Surface configuration; 4 ECUs per Tricon, stacked 2 high

1). Air configuration; 16 ECUs per a single standard 463L pallet

2). Same

c. Maximum weight ** 675 pounds 600 pounds

d. Supply and return ports 1) System shall have 16” inside diameter supply and return ports.

2) The supply and return ports shall have rigid screens/grates fixed inside the connection ports.

3) The supply and return ports shall be equipped with removeable rigid covers to be used when shipping/storing to prevent intrusion of pests, debris, and rain.

4) ECU shall have a washable-type air filter located between return duct and indoor coil and easily accessible to remove for cleaning

1) Same

2) Same

3) Same

4) Same

BEAR ECU RCM CONT.

e. Ducts* 1) System shall include two each, 10ft long ducts and two each, “Y”s section to allow splitting the supply and return ducts to connect one ECU to 2 shelters. “Y”s shall be designed to direct airflow evenly between the 2 shelters without dampers and have the ability to connect to the ECU.

2) Ducts shall be easily connected to the ECU and to each other with ‘Cam over style, Part No.

57-HT370-415SS, Protex Fastners or equivalent.

3) Nylon material used to secure the ducts onto the ECU ports will not be used.

4) Ducts shall be insulated to minimize cooling/heating loss; minimum value R-3.

5) Return ducts shall have a detachable screen on the shelter end to prevent items like towels, bottles, etc. from being drawn into the ECU.

6) Ducts shall be collapsible to minimize shipping space and will return to their designed operational size after prolonged storage. The ducts shall not constrict during operation.

5) Same

6) Same

f. Forklift pockets System shall have fully enclosed forklift pockets with fork opening dimensions of 14 ½ X 3 ¾ inch on all 4 sides

Same

g. Slope 1) System shall be designed to operate on terrain with a slope of up to 10 degrees.

2) A condensate drain shall be incorporated and function at any orientation on the slope; top, middle, or bottom.

3) The condensate drain hose shall be 10’ in length and be easily connected without tools.

h. Information

Diagrams/Plates

System shall include system schematic, electrical schematic, and wiring diagram plates attached to an accessible location for maintainer reference and designed to handle exposure to sun and harsh weather.

Same

i. Mobility/Storage ** 1) All controls, connections, gages, switches, etc.

shall be recessed into the system and not extend beyond the exterior profile to prevent damage during movement, storage, and shall be accessible without the use of hand tools.

2) ECU shall be capable of being stacked up to 4 high for storage.

3) ECU shall incorporate guides/pins to aid in alignment and securing when ECUs are stacked onto each other and provide a way to securely join the ECUs together when stacked.

4) ECU shall include retractable or foldable legs that will raise the ECU 4-6” off the ground.

5) Provisions shall be made for an optional solid-rubber wheel kit to facilitate moving the ECU without the need for MHE on improved/hard surfaces

2. OPERATIONAL

ENVIRONMENT

a. Operational

Temperature Range*

Cooling; +50o F to +125o F

Heating; -25o F to +75o F

Same

b. Storage Temperature

Range

Non-Operating -65o F to +160o F

c. Operating altitude

From sea level to ten thousand feet (10,000’) Same

d. Blowing Rain IAW MIL STD 810

e. Solar Radiation IAW MIL STD 810 Same

f. Fungus (Tropical) IAW MIL STD-810

g. Salt Fog IAW MIL STD 810 Same

h. Sand/Dust (Desert) IAW MIL STD 810 Same

i. Vibration and Shock for air transport

IAW MIL STD 810 Same

3. FUNCTIONAL

CHARACTERISTICS

a. Output* 1. The BEAR ECU shall provide a minimum of

60,000 BTU/hr. of cooling at temperatures up to

125o F.

2. The BEAR ECU shall provide a minimum of

40,000 BTU/hr. heating capacity to include supplemental resistive heating.

3. The BEAR ECU shall provide a minimum of

2000 SCFM of evaporator airflow.

3) The BEAR ECU shall provide a minimum of

2200 SCFM of evaporator airflow.

b. Input Power* 1) 3-phase, 50/60 Hz, 208/230 VAC, 60 amp.

2) Power required to operate the system in AC mode at maximum temperature (125o F) shall not exceed 13kW

3) System shall incorporate soft start technology such that the startup (inrush) current does not exceed operating current by more than 20%.

4) ECU shall be equipped with a recessed Class-L

60-amp bulkhead-style receptacle for connecting an external power cable.

5) The ECU shall include a removeable 25’ power cable equipped with a Class-L connectors for compatibility with BEAR power distribution equipment.

2) Power required to operate the system in AC mode at maximum temperature (125o F) shall not exceed 10.5kW

3) System will incorporate soft start technology such that the startup (inrush) current does not exceed operating current by more than 10%.

c. Makeup Air

BEAR ECU shall have the capability to introduce make-up air adjustable from 0 to 500 SCFM.

d. Noise Level Noise level shall not exceed 80Db at 2 meters, measured 1 meter from the ground

Noise level shall not exceed 75Db at 2 meters, measured 1 meter from the ground

e. Controls* 1) System will be controllable with a 25’ tethered remote control thermostat that will be located within a shelter.

2) The ECU will also be controllable with a control panel located on the ECU; all controls will be digital. Controls shall provide the capability to select between Cool, Vent, Heat, and

Off modes of operation and temperature setting.

3) The ECU shall not require the use of computer or other external HMI connection for purposes of software updates or software programming after component replacement.

4) System will incorporate advanced blower control technology to maximize the Coefficient of

Performance (COP) by capturing residual cooling/heat after the compressor/heat strips have turned off, then shutting off the blower.

f. Service Life / Storage ** The ECU shall be designed to have a service life of twenty (20) years. Suitable for extended storage in an outside environment for twenty-five

(25) years with a minimum interval of 24 months between inspection/preventive maintenance.

Same

4. TRANSPORTABILITY Be transportable IAW MIL-STD-1791 in C-130 aircraft. Non-operating sea level to forty thousand feet (40,000’) (during airlift). Must be transportable via all modes of surface shipment – rail, sea, road, etc.

5. MAINTENANCE

a. Tools 1) No special tools will be required for maintenance and repair of the BEAR ECU, with exception of section 3 below. A special tool is defined as any tool that is not in the CE HVAC tool kit. (A listing of the HVAC tool kit will be provided as part of the PD)

2) If a special tool is required, it will be provided with the ECU

3) No computers or other type external media interface shall be required for operations, maintenance, troubleshooting, and repairs.

b. Human Engineering 1) All components shall be selected and located for maximum ease of operation, servicing inspections, and maintenance.

2) Parts shall be designed to minimize improper mounting and incorrect alignment.

c. Maintainability** 1) Routine inspections/servicing tasks require no special hand tools.

2) Mean Time To Repair (MTTR), to include fault isolation and operational check, shall not exceed 2 hours.

6. ENVIRONMENTAL

COMPLIANCE

a. Hazardous Materials No Ozone Depleting Chemicals or items on EPA

List.

Same

7. FIRE PREVENTION,

SAFETY,

DESIGN &

CONSTRUCTION

PRACTICES

Best Commercial Practice

NFPA-70

Same

8. CORROSION

PREVENTION

1) Best Commercial Practices.

2) Dissimilar metals shall not be used IAW MIL-

STD-889B.

3) ECU will be designed for operation in salt-air environments. Coils, chassis/frame shall be corrosive resistant for these environments.

9. INTEGRATED

LOGISTICS

SUPPORT (ILS)

a. Technical Manuals TM86-01 (TMCR) verified technical manuals available to users sixty (60) days prior to production hardware delivery.

b. Spares Available world-wide, through organic or commercial means, when production hardware is delivered. All spares required to support 30 days of operations, without resupply, must be listed on an Initial Spares Supplies Listing (ISSL). Initial spares will be provided/deliverable. System must be fully provisioned for organic support over its expected service life.

c. Test Equipment Minimize requirement for test equipment. If test equipment is required, use existing Government inventory test equipment.

Same

d. Storage Inspection at 24-month intervals during storage without preventive maintenance.

10. TRAINING Multi-media training course in accordance with

AFCEC QTP requirements, and will cover safety, set-up, operation, repair, and troubleshooting.

11. PAINTED COLOR 1)System shall be coated with a thermal reflective coating, Sand Matte in color, color number

33446.

2) Chemical Agent Resistant Coating (CARC) shall not be used.

3) Coating shall comply with MIL-PRF-85285E

* - Key Performance Parameters (KPP)

** - Key System Attribute