Pfannenberg EB 210, Operating And Maintenance Instructions Manual

Page: 61 / 293

Operating and Maintenance Instructions - Chiller - Series EB 210 - EB 440 © Pfannenberg GmbH Page 61 / 293
EN
3.3 The Chiller: Overview
3.3.1 Refrigeration circuit
– main components
Compressor
The choice of the compressor used depends on the cooling capacity of the chiller. Depending on the capacity,
reciprocating, rotary or scroll compressors are used. Each compressor is equipped with a thermal overload
protection.
Condenser
As a heat exchanger so-called Microchannel condenser are used, which consist of aluminum tubes and aluminum
fins.
NOTICE
The chiller is not intended to be installed or operated in an aggressive atmosphere, as this may damage the
condenser.
Fan
The fan is mounted on the top of the chiller and blows warm air upwards into the environment. A protective grid
prevents direct contact with any rotating parts.
Expansion valve
The valve is responsible for the optimum refrigerant charge of the evaporator and is factory set for each unit.
A change in the setting is only to be carried out by appropriate specialist personnel.
Evaporator
The evaporator used is a plate heat exchanger. This ensures the heat exchange between the coolant and the
refrigerant and consists of copper-brazed stainless steel plates.
3.3.2 Hydraulic circuit
– main components
Pump
As standard, peripheral pumps are used which have different delivery rates depending on the device performance.
The flow rate is always assigned to a specific pressure which is directly dependent on the design of the pump used
and thus on the characteristic curve.
The information on the pump output always considers the internal pressure losses of the chiller.
In addition to the standard pump, more powerful pumps are available for higher pressure losses.
Tank
All chillers are equipped with a plastic tank. This serves as a buffer for the cool brine to always provide enough
liquid ready and reduces the number of ON-OFF cycles of the compressor.
The tank size is matched to the device performance.