Carrier manual 30RA/30RH, Water connections, Gb, E N G L I S H, The pump leakproof, glycol

30RA/30RH

Water connections

E N G L I S H

Ethylene glycol curve

°C
	ATTENTION:
mixture
	The pump leakproof
	components are not suitable
	for use with propylene
Freezingtemperatureofwater-ethyleneglycol
	glycol.
Weight concentration of ethylene glycol in water %	CAUTION:
	Using water with glycol may
	make it necessary to change the
	configuration of the control
	system.

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 (unit without hydronic module).

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.A flow switch should be installed in a straight horizontal stretch with a length of at least five times the line diameter on either side.

The flow switch must be positioned in the exchanger inlet pipe. It must be electrically connected in accordance with the wiring diagram (only unit without hydronic module).

If this is not possible, the installation should incorporate a protection device which is activated when there is no water circulating in the heat exchanger.

2.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 standard supply of the unit with hydronic module includes a mesh filter to be fitted during installation.

3.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.

4.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.

5.In case of water refrigeration at temperatures lower than 5° C, or

if the unit is installed in areas where temperatures drop below 0° C, water must be mixed with a proper quantity of ethylene glycol (see the curve above).

Use the curve to determine the correct ethylene glycol concentration for the temperature.

Frost protection

The plate heat exchanger and the water connections of the hydronic module pump may be damaged in spite of the anti-freeze protection system these units are fitted with.

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:

Both the appliance main switch (Q1) and the auxiliary protection switch for the electric heaters (QF101) must always be in the closed position (the positions of Q1 and QF101 are indicated in the wiring diagram).

GB - 7