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710.1760.00.02-03A
Differential pressure monitor
The differential pressure monitor protects the plate heat exchange of the chiller against excessively low
flow rates and hence against damage caused by ice formation.
OPTIONS – HYDRAULIC CIRCUIT
BP – Automatic bypass / Overflow valve
The overflow valve is intended to guarantee a minimum throughput in the cooling medium circuit. This
protects the evaporator and the pump.
BPM – Manual bypass
This type of bypass can be used to manually adjust the minimum throughput in the cooling medium cir-
cuit.
CAA – Automatic cooling medium feed via a float valve
The cooling medium is filled up automatically by the float valve if the level in the tank falls below a mini-
mum.
EV 1 – Solenoid valve 1 (connect without current) in return circuit
These valves should be used in open systems when the consumers are installed on a higher level. This is
generally used as a valve combination with VNR (see below).
FL – Flow controller
The flow controller located in the cooling medium inlet monitors the flow in the cooling medium and con-
sumer circuit. It switches the cooling system off if the throughout falls below a minimum.
LVE – Flow switch (systems open to the atmosphere with tank)
The flow switch is located in the tank and monitors the cooling medium level.
If the water level falls and reaches the minimum value, the cooling system and the pump(s) are switched
off. The chiller cannot be switched on again until the cooling medium has been filled up to the MAX mark
on the level display.
RA – Tank heating
The tank heating warms the cooling medium in the tank. It is used to achieve the optimum operating
temperature within a short time if there is a low ambient temperature and no process heat is being add-
ed.
TD – Digital thermometer in return circuit (systems with single and dual circuit)
The digital thermometer shows the inlet temperature of the cooling medium.
VNR – Non-return valve in the supply line
These valves are used in open systems when the consumers are positioned at a higher level and prevent
uncontrolled flow of the cooling medium back into the tank when the pump is stationary. They are gener-
ally used in combination with a solenoid valve (EV, see above).
Dirt trap
If there is a risk of the cooling medium becoming contaminated by solids with a diameter > 1 mm during
operation, a dirt trap with an appropriate mesh width has to be used. This should preferably be fitted
outside of the chiller so that it can be cleaned easily. It is important to note the flow direction. The dirt
trap must be cleaned at regular intervals after commissioning the chiller, or as required.
Pump alternatives
A pump is provided as standard and supplies a pressure of 2 to 3 bar at the defined nominal flow rate.
Other pumps can of course be selected according to the project. Depending on the pressure and volume
it may be necessary to carry out adjustments to the system characteristics with the aid of control valves.
SINGLE-CIRCUIT SYSTEM WITH TANK (STANDARD)
The cooling medium circuit has been designed as system open to the atmosphere. The circuit consists of
the following components:
pump of horizontal or vertical design,
tank, open to the atmosphere, thermally insulated with draining facility, optical filling level indica-
tor and cover to prevent contamination of the cooling medium.
piping system consisting of copper or plastic pipes with manometer and probe connection for the
operating thermostats.
The volume of cooling medium in the tanks is a contributory factor to maintaining the constancy of the
cooling medium outlet temperature. The pump conveys the cooling medium within the circuit out of the
tank to the consumer and then back into the tank via the evaporator.
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26/11/2012
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