APC INROOM ACPSC3000 Operations Instructions download pdf (Page 16)

InRoom CW/DX – Operating Instructions16

2.5 Cooling water circuit (G, GCW, GE)

In G- and GCW units, the cooling water circuit contains a plate condenser as the interface to the refrigerant

circuit and two valves for ﬁ lling and draining.

In GE units the water circuit contains additionally a direct cooling coil, two 2-way ball valves and a tempe-

rature sensor at the water inlet.

The distribution of the water ﬂ ow through the free cooling coil and the condenser is taken on by two ball

valves controlled by the controller (one for the condenser and one for the free cooling coil). The ball valve

control factor in the condenser circuit is the condenser pressure on the refrigerant side. T he ball valve control

factor for the GE-coil is the temperature at the water inlet.

2.6 Chilled water circuit (ACW, GCW)

The chilled water circuit consists of a direct cooling coil, a 3-way valve, by which the cooling capacity is

controlled, and ﬁ lling and vent valves. The 3-way valve is controlled by the incorporated controller.

Component protection

Compressor

The compressor is equipped with an internal high pressure protection which opens a bypass in case of high

pressure, so that an internal pressure compensation takes place. Refer to "Safety Switches" on page 15 for

more information.

Fan

The EC fan control contains safety elements which protect the fan in case of phase failure, voltage ﬂ uctuation

and excessive current. If the voltage in one or more phases drops for 5 seconds or longer below 290 V, the

fan is switched off and an airﬂ ow alarm is generated. In consequence of the alarm, the compressor and, if

existant, the reheat and humidiﬁ er are also switched off.

After the supply voltage returns the airﬂ ow alarm must be manually reset in order to restart the cooling

unit.

In areas with unstable electrical supply networks, the option "three phase control" should be chosen. With

this option the cooling unit starts automatically after the return of the supply voltage.

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APC INROOM ACPSC3000 Operations Instructions Page 16