Description
A high-capcity, one-piece, frontmount, cryogen powered cooling and heating unit designed and engineered for today's jumbo trailers. Unit has no engine, no compressor and uses a naturally occuring refrigerant: carbon dioxide. An exclusive Thermo King designed and built vapor motor operated by high-pressure carbon dioxide, gas powers the evaporator blower and a brushless alternator. A propane fired heater superheats carbon dioxide for heating and defrost.

Refrigeration Capacity
System net cooling capacity at 100º F (38º C) ambient and high-speed engine operation.
 

Return Air To Evaporator		Btu/hr	Watts
35ºF	(2ºC) box	58,000	17,000
0ºF	(-18ºC) box	60,000	17,600
-20ºF	(-29ºC) box	61,000	17,900

Airflow

	CFM	(M³/h)
Pulldown	3200	5440
Low-speed	2000	3400

Noise Level at 23' (7m)

	dBA
High-speed	62.4
Low-speed	57.2

System Weight

w/o Fuel	1280 lbs	(581 kg)
w/ Fuel	2200 lbs	(998 kg)

Moving Parts

Engine	None
Compressor	None
Alternator	No brushes, No bearings
Belts	None
Control Relays	None
Defrost control	Damper motor
Air mover	Vapor motor
Pressure control valves	8
Control valves	9

Environmental Impact

Ozone Depletion Potential		0
Emissions:	Cooling	0
	Heating/Defrost	Propane Burner

Pulldown Time

100°F (38°C) Ambient, -20°F (-29°C) box
Trailer UA=100/KA=53*	Time= 1 hr	45 min
Trailer UA=150/KA=80	Time= 2 hrs	30 min

Fuel Capacity

LCO2	926 lbs (420 kg) DOT fill weight
Propane	40 lbs (18 kg)
	Optional 100 lb (45 kg) undermount tank

Cooling Hours Without Refueling**

85°F (29.4°C) Ambient, 35°F (2°C) load
	UA=150/ KA=80	UA=100/ KA=53*
No door openings	14 hrs	19 hrs
Ten 15 min door openings,     with air curtains	10 hrs	13 hrs
Ten 15 min door opeings,     w/o air curtains	8 hrs	11 hrs

* KA=53 represents a trailer with K=0.4 W/m²/°C and inside dimensions of 2.5 m x 2.6 m x 11.7 m length.
** Data extrapolated from tests with empty trailers. 100 lbs (45 kg) reserve LCO₂ left in tank. Initial pulldown requires approx. 150 lbs (68 kg) of LCO₂.

Site Requirments
Liquid carbon dioxide station, 35 ton (31,750 kg) recommended. Liquid carbon dioxide is delivered by gas companies at 300 psi (2.1 MPa).

Connections For Fill Station
1. Insulated liquid supply line:
    1.0" (25.4 mm) diameter copper
2. Vapor supply line:
    1/2" (12.7 mm) diameter copper
3. Power supply:
    110 volt AC, 15 amp service

Thermo King Automatic Fill Station
Dimensions: 48" (1220 mm) wide x 41" (1041 mm) length x 18.5" (470 mm) deep

• Pressure conversion to 120 psi (0.8 MPa) from 300 psi (2.1 MPa)
• Filters dirt and water ice
• Reduces fill noise by 97%
• Automatic shut-off: prevents freeze-up of unit tank
• Automatic purge: keeps filling system free of dirt and moisture
• Refuels 900 lbs (408 kg) in 15 minutes

Other Considerations
Quality of fuels and cleanliness of equipment is important for trouble-free operation.
Fill station comes with standard 10' (3 m) hoses; longer hoses available.

* Tank Guard
Tank Guard is a Thermo King designed, foam insulated aluminum shield, that protects the SB-III CR's cryogenic storage tank.