Installation
Connecting supply gases
33
Plumbing Connec-
tion for Cryogenic
Cooling (if installed)
Overflow Drain f
Condensation
Left Side View
Front
The appropriate coolant must be used, based upon the cryogenic option
installed•either liquid CO
1
coolant or liquid N
1
coolant. To switch from
one coolant to the other, replacement of the entire valve assembly is
required•Accessory 19239A for liquid CO
1
, or Accessory 19239B for
liquid N
1
.
For liquid carbon dioxide coolant • Connect a length of 1/8•inch
stainless steel tubing to the brass fitting on the side of the inlet valve.
Use two wrenches•one to support the fitting on the valve, the other to
tighten the fitting on the tubing.
The CO
1
tank must be equipped with an internal eductor (dip) tube to
ensure delivery of liquid rather than gas. Connect the tubing to the exit
fitting on the tank. Do not use a regulator as vaporization (and all
cooling) would occur in the regulator instead of the oven.
Tubing between tank and inlet valve does not require insulation.
For liquid nitrogen coolant • Connect 1/4•inchcopper tubing to the
cryogenic inlet valve. Use two wrenches•one to support the fitting on the
valve and the other to tighten the fitting on the tubing.
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