Thermo Scientific ModulyoD, Инструкция по эксплуатации

Страница: 6 / 30

6
Refer to Figure 3, on page 6 for the location of components of the refrigeration system
on the ModulyoD.
NOTE: There are no longer user-serviceable parts inside the ModulyoD refrigeration
system.
The condenser chamber is cooled by refrigerant, which evaporates in the copper cool-
ing coil wound externally around the chamber. The thermo expansion valve (item2) pro-
vides excellent performance to the system. The compressor (item1) is a high-capacity,
air-cooled, hermetically sealed unit.
A suction-line accumulator (item 3) in the return line from the cooling-coil to the com-
pressor prevents slugs of liquid refrigerant, which might cause damage, from reaching
the compressor.
A filter dryer (item 4) in the line between the liquid receiver (item 5) and the expansion
valve absorbs any residual particulate and water contamination in the system. The fil-
ter dryer does not need to be serviced or replaced.
The electrical fan (item 6) simultaneously cools down the condenser coil (item 7) and
the compressor.
See Section 2.2 on page 12 for refrigerant type and charge.
1.2.1.2 THE REFRIGERATION SYSTEM
The accessory flange and condenser chamber are made entirely of stainless steel.
The chamber itself is a thin walled cylinder with a dish shaped bottom. It has a total
capacity of 5 liters of ice. The accessory flange is a large diameter flat circular plate
located immediately above the chamber. The accessory flange is designed to accept
a wide variety of accessory items. A large opening in the center of the accessory
flange provides easy inspection, cleaning and defrosting of the condenser chamber. It
also facilitates high vacuum pumping rates. A circular cooling coil wrapped around the
outside of the condenser chamber cools the walls of the chamber. This coil is cooled
to approximately -50 °C under normal operating conditions with no load applied. At
this temperature most water vapor will condense and freeze on the chamber walls.
1.2.1.1 THE ACCESSORY FLANGE & CONDENSER CHAMBER