Carrier 19XR Spécifications télécharger pdf (Page 3)

■■ Alarm■ﬁle

This ﬁle maintains the last 25 time- and date-stamped

alarm and alter messages in memory; this function reduces

troubleshooting time and cost.

■■ Overrides

The control system detects conditions which approach

protective limits and takes self-corrective action prior to

an alarm occurring.

The system automatically reduces chiller capacity when

any of the following parameters are outside their normal

operating range:

- High condenser pressure

- High motor temperature

- Low evaporator refrigerant temperature

- High motor current

During the capacity override period, a pre-alarm (alert)

message is displayed, informing the operator which condi-

tion is causing the capacity override. Once the condition is

again within acceptable limits, the override condition is

terminated and the chiller reverts to normal chiller water

control.

During either condition, if the protective limit is reached,

the chiller shuts down and a message is displayed informing

the operator which condition has caused the shutdown

and alarm. This function increases unit life.

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■ On the19XR base units capacity control is by means of

variable inlet guide vanes located at the impeller inlet. Load

modulation is from 100% to 15% of compressor full load

under nominal ARI conditions without the use of hot gas

bypass. The guide vanes are precisely positioned by a PID

(proportional-integral-derivative) control algorithm to

ensure precise and quick control of desired chilled-water

temperature without hunting or overshooting the set point.

If the machine includes a factory-installed variable-frequency

drive (19XRV), the compressor speed is regulated by the

control of the voltage-frequency values, applied to the

motor. The voltage applied, generated by pulse width

modulation, is proportional to the frequency.

The calculation of the water temperature parameter

deviation measured results in an adjustment of the machine

capacity through a simultaneous and coordinated action

on guide vane opening and compressor speed.

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■ Mechanically cleanable cooler and condenser.

■ The machine concept allows the refrigerant to be stored

inside the chiller during servicing, reducing refrigerant loss

and eliminating time-consuming transfer procedures.

■ Easy-access suction and discharge pressure and temperature

information using enhanced display module.

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Carrier 19XR Spécifications Page 3

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