APC INROOM ACPSC3000 Operations Instructions download pdf (Page 78)

InRoom CW/DX – Operating Instructions78

Baugröße 1 2 3 4 5

Filter 525 x 453 mm 4 4 2 2 2

Filter 525 x 398 mm - 2 6 8 10

Tot al 4 6 8 10 12

Compressor

The compressor is hermetically sealed with a lifetime supply of ester oil. The compressor crankcase is pres-

sure lubricated by an internal pump with permanently lubricated, sealed bearings. Under normal operating

conditions the ester oil should not need to be replaced. Ester oil is hygroscopic and absorbs moisture quickly

when exposed to air. This could occur after repeated recharging of the refrigerant. High oil moisture levels

react with refrigerant to form acid which results in system contamination due to the corrosive nature of the

contaminated oil. To prevent compressor burn-out the ester oil should be replaced.

The oil level can be checked by looking at the sight glass on the side of the compressor

Expansion valve

The refrigerant circuit is equipped with an electronic expansion valve (EEV), which controls the superhea-

ting in the evaporator. The EEV is controlled by the microprocessor using suction temperature and pressure

inputs. The superheat is factory set to 20

°F (7 K) and should only be adjusted by qualiﬁ ed personnel. The

expansion valve can freeze if the humidity in the system is excessive.

Danger:

Danger of explosion. Do not thaw by open ﬂ ame. Thaw with moist warm cloth. Check the

sight glass.

10.4 Air circuit

Heat exchanger (Evaporator/GE/CW-coil)

The heat exchanger consists of copper tubes with aluminum ﬁ ns. If a leak occurs, the joints and connections

to the heat exchanger should be visually inspected for signs of the leakage. If the heat exchanger coils

are exposed to particularly dusty or dirty air, particles will collect in the ﬁ ns reducing heat transmission and

increasing the resistance to air ﬂ ow. High airﬂ ow resistance is indicated if the current consumption of the

fan motor increases.

The heat exchanger ﬁ ns can be cleaned with pressurized air which should be blown opposite of the normal

air ﬂ ow direction through the ﬁ ns.

Caution:

Do not distort the ﬁ ns while cleaning, this also increases the air resistance.

Fan

The bearings of the fans do not need maintenance. Check the operation current. An increased operation

current indicates either a higher air resistance by a clogged pre-ﬁ lter or a winding short circuit in the fan

motor.

The fans are speed controlled in dependance of the required cooling capacity. You can manually modify the

speed at the controller for test purposes, so as to compare the measured current with the values on the

pages with the technical data or with those of the planning tool.

Air ﬁ lter

A ﬁ lter monitor controls the state of the ﬁ lter. As soon as the pressure loss exceeds an adjustable value, a

ﬁ l ter alarm from the controller is released. The controller can be conﬁ gured to compensate for the pressure

loss by using a higher fan speed. However you should not wait too long to exchange the ﬁ lter. The ﬁ lters can

be accessed by the front doors. Depending on the cabinet size, the number of ﬁ lter elements varies.

The clogged ﬁ lter elements can not by cleaned with pressurized air, as the ﬁ lter structure would be destroyed.

When you re-install the ﬁ lter elements, take care that

the side of the ﬁ lter with the coloured mark (dirt side)

is turned away from the evaporator.

Filter size 1: 525 x 453 mm (20.7 x 17.8 in)

Filter size 2: 525 x 398 mm (20.7 x 15.7 in)

Cabinet size

Filter 1

Filter 2

Tot al

1 2 ... 73 74 75 76 77 78 79 80

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APC INROOM ACPSC3000 Operations Instructions Page 78

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