4.3
Access Well
The furnace access well is visible on top of the furnace.
The furnace access well is where the freeze point cell is inserted and removed
from the furnace. After a freeze point cell is inserted into the furnace, a thermal
shunt disk and thermal guard assembly are installed over it. This provides a
block to the heat loss from the well and provides more temperature uniformity
for the cell.
4.4
Back Panel
The back panel consists of an exhaust fan, a serial communications connector, a
power cord, and cooling water ports. See Figure 5 on page 19.
1.
The exhaust fan allows air circulation around the electrical components.
Be sure to keep this fan free of foreign objects that could hinder air flow.
2.
The serial communication connector is a DB-9 connector for interfacing
the furnace to a computer or terminal with serial RS-232 communica-
tions. (See Section 7 starting on page 39 for details.)
3.
The power cord is a non-removable cord.
4.
The cooling water ports are provided for connecting to cooling water to
reduce the heat load. See Section 4.5 Plumbing for details.
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