Thermosafe 460, 475, 485 Operating Instructions Manual

V

OPERATING INSTRUCTIONS

IMPORTANT: This machine can only be used with a liquid CO2cylinder equipped with a built-in siphon (dip tube).

When ordering CO

be certain to get liquid CO2 with a siphon.

2

1. Firmly connect machine hose to CO2 cylinder. Tighten with wrench
supplied. Use plastic washer supplied for inside of hexagonal nut that
attaches to cylinder valve.

CO

2

Safety

alve

2. Ensure nothing obstructs flow of CO2 through hose. Attach end of hose
firmly to top fitting on Dry Ice Machine. Pull ring at end of safety valve to
confirm spring-loaded valve can open if pressure exceeds 20 PSI.

3. Open CO2 cylinder valve no more than 1-2 small divisions on inner
scale (0-20) of gauge. This gives maximum number of ice blocks and
does not waste CO

. Be sure vapor escaping from vents of machine

2

does not carry snow solids. If there are, close down valve slightly. After
ice builds up in machine, speed up process by opening valve another
degree or two. If needle reaches 10 on inner scale turn valve to off
position.

4. Vapor will discharge through vertical filter slots as dry ice block is
forming. When vapor discharges from space between lid and body of
machine (and sound changes), dry ice block is fully formed.
Immediately close cylinder valve.

The first 1-2 blocks will take slightly longer to process because box and
feed pipe are being cooled to proper temperature. Time then becomes
shorter to produce additional blocks.

Lift Up

5. Open dry ice block machine by loosening latches and folding down
sides. Remove block for use or storage.

Caution: always wear

protective gloves when handling dry ice; can cause burns and
frostbite.

Blocks can be stored in ThermoSafe® Insulated Shippers.

6. During and after making dry ice block, handle feed hose carefully. Hose
will appear white and is frozen. If bent, pulled or twisted, hose can be
damaged or broken.

7. When using 320-lb. CO2 cylinder, remove pressure gauge from brass

CO

2

“T” in line. Replace pressure gauge with plug from industrial gas dealer.
With larger size cylinder, gauge can become choked with gas and is of
no measuring significance.

y

1. Gaseous CO2 vapors can cause suffocation. Use machine only in well ventilated areas.

2. Disconnect feed hose of machine from cylinder when not in use. Store cylinder indoors or in shade, away from
any heat source. (See Helpful Information below).

3. Use machine only on level supporting surface during operation. Never allow machine to hang from feed hose.

WARNING:

SPECIFICATIONS MODEL 460 MODEL 475 MODEL 485

Dimensions of dry ice block 7.62 x 4.76 x 17.78 cm 8.57 x 6.67 x 17.78 cm 13.34 x 8.57 x 18.1 cm

Weight of dry ice block .45 kg ± 10% .765 kg ± 10% 1.44 kg ± 10%

Yield from 50-lb. liquid CO2

cylinder at room temperature.*

Total weight of dry ice

* A 22.7 kg CO2 cylinder at room temperature will contain approximately 19 kg useable liquid CO2. The balance is vapor which does not convert to
solid dr

ice. † Yield can be appreciably increased at lower temperatures; i.e., at 0˚F approximately 1/3 more blocks will be produced.

Conversion Weight: The usual 22.7 kg liquid CO2 cylinder actually contains only 19 kg of liquid CO2. Remaining 3 or

3.6 kg is vapor gas which does not convert to solid dry ice. This is standard for gas supply industry.

Weight Checks: Empty tank weight (Tare) is stamped on shoulder of tank below threaded fitting. Tank should read

52.27 ± .5 or 1 kg. Gas and filled tank should weigh 75 kg ± .5 or 1 kg.

8-10 blocks†

4.55 kg ± 10%†

HELPFUL INFORMATION

5-6 blocks†

4.55 kg ± 10%†

3 blocks†

4.09 kg ± 10%†

Temperature Liquid CO2 Vapor

16°C (60°F) 72% 28%
21°C (70°F) 70% 30%
27°C (80°F) 61% 39%
31°C (87°F) 0% 100%

Above 31.1˚C (the critical temperature) only vapor exists in tank and no additional dry ice will be formed.

Storage: If possible, CO2 tank, ice machine and feed pipe should be kept in low temperature environment up to time of
usage. This will increase yield of dry ice.

Making Dry Ice from Liquid CO2: Converting liquid CO2 to solid dry ice blocks is accomplished by utilizing Adiabatic
Expansion Principle (The Joule Thompson Effect).

When liquid CO2 is released from cylinder through supply valve and feed tube, it leaves an environmental pressure of
838 PSI and is forced through tube into ice making unit which is at atmospheric pressure.

It then vaporizes and expands to form snow which packs on retaining walls lined with specialized filter pads while CO2
gas escapes through ports and filters. Machine fills with dry ice within 1-2 minutes. The colder the components, the
shorter the fill time.

At 21˚F and 775-800 PSI, the method described is 26.15% efficient. At -18˚C and 290 PSI efficiency is increased to 39%.
The lower the temperature, the greater yield of dry ice.

Tegrant Corporation
ThermoSafe Brands

3930 Ventura Drive, Suite 450
Arlington Heights, IL 60004
www.thermosafe.com
(t) 800-323-7442 (f)847-398-0653

LIT105METRIC-06/07 Copyright © ThermoSafe Brands 2007