APC DX Service Manual download pdf (Page 6)

2APC NetworkAIR™ FM-DX

Scalable Solution for Critical Environments

Temperature and Humidity

Design Conditions

Maintenance of temperature and

humidity design conditions is criti-

cal to the smooth operation of a

technology room. Design condi-

tions should be 72-75°F (22.2-

24.8°C) and 45-50% relative

humidity (R.H.). As damaging as

the wrong maintained conditions

can be, rapid temperature swings

can also have a negative effect on

hardware operation. This is one of

the reasons hardware is left pow-

ered up, even when not processing

data. Computer room air condition-

ing is designed to maintain

temperature at ±1°F and humidity at

±3-5% R.H. 24 hours a day, 8760

hours a year. Vapor barriers and

sealed rooms are required to main-

tain these tolerances.

In contrast, comfort systems are

designed to maintain ±5°F from the

temperature setpoint. There is usu-

ally no dedicated humidity control

and the simple controllers cannot

maintain the set point tolerance

required for temperature, allowing

potentially harmful temperature and

humidity swings to occur. This is

not acceptable for sensitive elec-

tronic equipment.

Air Quality

Computer room air conditioners

provide a high CFM, around 550

CFM/ton (155 cfm/kW). This high

CFM moves more air through the

space improving air distribution and

reducing the chance of localized hot

spots. It also allows more air to

move through filters, ensuring a

cleaner environment. This requires

a moderate- to high-efficiency filter

bank to minimize airborne particles.

Problems Caused by the Wrong

Environment

A poorly maintained technology

room environment will have a nega-

tive impact on computer room

operations. The results can range

from data corruption to complete

system shutdowns and failures.

High & Low Temperature

A high or low temperature swing or

rapid temperature swings can cor-

rupt data processing and shut down

an entire system. Temperature vari-

ations can alter the electrical and

physical characteristics of elec-

tronic chips and other board

components, causing faulty opera-

tion or failure. These problems may

be transient or may last for days.

Transient problems can be very dif-

ficult to diagnose and repair.

High Humidity

High humidity can result in tape

and surface deterioration, head

crashes, condensation, corrosion,

paper handling problems and (gold

and silver) migration leading to

component and board failure.

Low Humidity

Low humidity greatly increases the

possibility of static electric dis-

charges. Such static discharges can

corrupt data and damage hardware.

APC NetworkAIR™ FM-The

Right Solution

The APC NetworkAIR™ FM pro-

vides the maximum amount of

computer room cooling in a com-

pact footprint. Highly scalable, the

system is capable of growing with

your cooling needs as they increase.

Each system comes standard with

concise capacity controls for high

efficiency operation.

Compact Footprint

The NetworkAIR FM delivers a

high capacity of cooling in a small

“overall” footprint. Since the sys-

tem requires only front service

access, units can be placed side by

side and valuable floor space is not

wasted.

Capacity Control

The NetworkAIR FM utilizes tan-

dem scroll compressors for two step

modulation. One or both of the

compressors can run depending on

the load of the system. This allows

up to two steps of “true” unloading

without the power factor and fric-

tion penalty of an unloaded semi-

hermetic compressor.

Efficiency and Reliability

The high EER (up to 20.0) and few

moving parts of scroll compressors

provide efficient and reliable opera-

tion. Scroll technology has

unparalleled ability to withstand

liquid refrigerant ‘slugging’ which

is a major cause of compressor fail-

ure. It is designed as a single

assembly with one suction line and

one discharge line per set.

1 2 3 4 5 6 7 8 9 10 11 ... 61 62

Comments to this Manuals

No comments

APC DX Service Manual Page 6

Comments to this Manuals

Related products and manuals for Split-system air conditioners APC DX