Isotemp Basic 5-1Fisher Scientific
Section 5 Factory Installed Options
Described below are the factory installed options which are available, or
may be already installed, on your unit.
Warning Before installation of BUS components, make sure the power to
the freezer is disconnected, the battery switch is turned off (O) and the
freezer has warmed to ambient temperature.
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The built-in BUS (back up system) will keep the freezer chamber
temperature below the critical level in the event of a power or equipment
failure. If power to the freezer fails, or temperature increases to the back up
alarm set point, the BUS injects liquefied gas into the chamber to keep the
chamber temperature within the specified range.
The BUS operates on an internal 12-volt, rechargeable battery which is
kept charged during normal operation by the integral battery charger.
1. Install the injection assembly (Figure 5-1) through the 1/2” pre-
punched hole, directly behind the 2” vent stack hole in the center of
the chamber ceiling.
Note Cover the open end of injection assembly with tape to keep
insulation from entering the nipple.
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2. Slide 3/8” flatwasher over open end of nipple.
3. Insert the covered end of the injection assembly through the exterior
hole.
4. Remove the tape covering from the end of the nipple and install the
1/8” NPT brass tee on the open end of the nipple. Place Permagum
sealant between the brass tee and the interior top.
5. Remove the two Phillips head screws securing the metal bracket on the
vent stack assembly.
Back-Up System (BUS)
- P/N 1950533, 1950535
Install Injection Assembly,
Vent Stack and Solenoid
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