Frost Protection - CIAT EREBA ACCESS T 017 Manual De Instrucciones

Typical diagram of hydraulic circuit with hydraulic module 26-40kw
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24
17
15
24
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15
LEGEND
Hydraulic COMPONENTS
1 Mesh filter
2 Expansion tank
3 Relief valve
4 High pressure pump
5 Breather
6 Water drain valve
7 Flow sensor
8 Leaving temperature sensor from refrigerant - water exchanger
9 Entering temperature sensor from refrigerant - water exchanger
10 Plate heat exchanger
11 Anti-freeze electric heater for refrigerant - water exchanger
12 Anti-freeze electric heater for pipes
Make the plate heat exchanger hydraulic connections with the necessary
components, using material which will guarantee that the screwed joints
are leakproof.
The typical hydraulic circuit diagram shows a typical water circuit
installation in an air conditioning system.
ATTENTION: Use of units in an open loop is forbidden.
For an application with a water circuit, the following recommendations
must be taken into account:
1. The pump must be fitted immediately before of the heat exchanger
and after the connection to the system return (unit without hydraulic
module).
2. It is advisable to install shut-off valves to allow isolation of the most
important circuit components, as well as the heat exchanger itself.
These valves (ball, globe or butterfly valves) should produce a
minimum loss of charge when they are open.
3. Provide unit and system drains and vents at the lowest system point.
4. Install purges in the higher sections of the installation.
5. Pressure ports and pressure gauges should be installed upstream and
downstream of the water pump.
6. Thermometers should be installed in the unit water inlet and outlet.
7. All piping must be adequately insulated and supported.
Installation of the following components is obligatory:
1. The presence of particles in the water can lead to obstructions in the
heat exchanger.
It is therefore necessary to protect the heat exchanger inlet with an
extractable mesh filter. The filter mesh gauge must be at least 10 mesh/cm2.
The equipment standard version with hydraulic module is equipped
with mesh filter, included in the supply and installed.
2. After assembling the system, or repairing the circuit, the whole system
must be thoroughly cleaned with special attention paid to the state
of the filters.
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20
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21
25
26
12
--- Hydraulic module (units with hydraulic module)
SYSTEM COMPONENTS
15 Pocket for temperature sensor
16 Breather
17 Flexible connections
18 On/Off valve
19 Mesh filter (compulsory if the unit is not equipped with hydraulic module)
20 Pressure gauge
21 Water flow control valve (factory supplied but to be installed on site)
22 Charge valve
23 Bypass valve for anti-freeze protection (when, in winter, on/off valves
are closed)
24 Pressure sensor
25 Water drain valve from the plant
26 Water drain valve from refrigerant-water exchanger
3. Pump flow rate control is made through a flow control valve
supplied with the unit with hydraulic module, which must be
installed on the delivery pipe during installation.
4. When water has to reach temperatures below 5°C, or the
equipment is installed in areas subject to temperatures below
0°C, it is necessary to mix water with glycol in suitable quantity.
The maximum amount of ethylene glycol allowed is 30%.

Frost protection

Frost protection of the plate heat exchanger and of the circuit inside the
hydraulic module is always guaranteed down to -10°C by the electric
heaters that are automatically activated if needed. The power supply
to the electric heaters of the plate heat exchanger and to the internal
circuit of the hydraulic module must never be interrupted.
IMPORTANT: Filling, completing and draining the water circuit
charge must be done by qualified personnel, using the air purges
and materials that are suitable for the products.
Before any start-up verify that the heat exchange fluid is
compatible with the materials and the water circuit coating.
EN - 9
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EREBA ACCESS 17 - 40 T/HT
EN