Carrier AQUASNAP 30RB series Installation, Operation And Maintenance Instructions page 15

30RB/30RQ - 30RBY/30RQY
Water connections
Typical diagram of hydronic circuit
with hydronic module 26-40kw
16
15
24
15
LEGEND
HYDRONIC COMPONENTS
1 Mesh filter
2 Expansion tank
3 Safety 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
13 On/off valve ( automatic system for water filling- optional)
14 Pressure reducer (automatic system for water filling- optional)
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.
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 hydronic
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 hydronic 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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14
18
24
17
19
23
18 21
17
25
22
20
20
26
--- Hydronic module (units with hydronic module)
- - - - Water supply automatic system (optional)
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 hydronic 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 hydronic 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 and propylene glycol allowed is
30%.
Frost protection
Frost protection of the plate heat exchanger and of the circuit inside the
hydronic 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 hydronic 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.
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E N G L I S H
10
11
GB - 13