Table 27 — Configuring Demand Limit

MODE

KEYPAD

SUB-MODE

KEYPAD

ITEM

DISPLAY

ITEM EXPANSION

COMMENT

ENTRY

ENTRY

 

 

 

 

 

 

CONFIGURATION

ENTER

DISP

ENTER

TEST

ON/OFF

Test Display LEDs

 

 

 

UNIT

ENTER

TYPE

X

Unit Type

 

 

 

OPT1

ENTER

FLUD

X

Cooler Fluid

 

 

 

OPT2

ENTER

CTRL

X

Control Method

 

 

 

HP.A

 

 

 

 

 

 

 

HP.B

 

 

 

 

 

 

 

EXV.A

 

 

 

 

 

 

 

EXV.B

 

 

 

 

 

 

 

M.MST

 

 

 

 

 

 

 

RSET

ENTER

CRST

X

Cooling Reset Type

 

 

 

 

 

 

 

 

Default: 0

 

 

 

 

 

 

 

0 = None

 

 

 

 

DMDC*

X

Demand Limit Select

1 = Switch

 

 

 

 

 

 

 

2 = 4 to 20 mA Input

 

 

 

 

 

 

 

3 = CCN Loadshed

 

 

 

 

DM20

XXX %

Demand Limit at 20 mA

Default: 100%

 

 

 

 

Range: 0 to 100

 

 

 

 

 

 

 

 

 

 

 

SHNM

XXX

Loadshed Group

Default: 0

 

 

 

 

Number

Range: 0 to 99

 

 

 

 

 

 

 

 

 

 

SHDL

XXX%

Loadshed Demand

Default: 0%

 

 

 

 

Delta

Range: 0 to 60%

 

 

 

 

 

 

 

 

 

 

SHTM

XXX MIN

Maximum Loadshed

Default: 60 min.

 

 

 

 

Time

Range: 0 to 120 min.

 

 

 

 

 

 

 

 

 

 

DLS1

XXX %

Demand Limit

Default: 80%

 

 

 

 

Switch 1

Range: 0 to 100%

 

 

 

 

 

 

 

 

 

 

DLS2

XXX %

Demand Limit

Default: 50%

 

 

 

 

Switch 2

Range: 0 to 100%

 

 

 

 

 

 

*Seven items skipped in this example.

Digital Scroll Option — The 30RAP units have a factory-installed option for a digital scroll compressor which provides additional stages of unloading for the unit. The digital compressor is always installed in the A1 compressor location. When a digital compressor is installed, a digital unloader sole- noid (DUS) is used on the digital compressor.

DIGITAL SCROLL OPERATION — A digital scroll oper- ates in two stages - the "loaded state" when the solenoid valve is normally closed and the "unloaded state" when the solenoid valve is open. During the loaded state, the compressor operates like a standard scroll and delivers full capacity and mass flow.

However, during the unloaded state, there is no capacity and no mass flow through the compressor. The capacity of the system is varied by varying the time the compressor operates in an unloaded and loaded state during a 15-second period. If the DUS is energized for 7 seconds, the compressor will be operating at 47% capacity. If the DUS is energized for 10 sec- onds, the compressor will be operating at approximately 33% of its capacity. Capacity is the time averaged summation of loaded and unloaded states, and its range is continuous from the minimum configured capacity to 100%. Regardless of capacity, the compressor always rotates with constant speed. As the compressor transitions from a loaded to unloaded state, the discharge and suction pressures will fluctuate and the com- pressor sound will change.

The ComfortLink controller controls and integrates the op- eration of the DUS into the compressor staging routine to maintain temperature control. When a digital compressor is in- stalled, an additional discharge gas temperature thermistor

(DTT) is installed along with the AUX board for control of the DUS.

DIGITAL COMPRESSOR CONFIGURATION — When a digital compressor is installed, the configuration parameter (ConfigurationUNITA1TY) is configured to YES. There is also a maximum unload time configuration, (Config- urationUNITMAX.T) that is set to 7 seconds, which in- dicates the maximum unloading for the digital compressor is 47%. This is done to optimize efficiency of the system.

PRE-START-UP

IMPORTANT: Before beginning Pre-Start-Up or Start-Up, complete Start-Up Checklist for 30RAP Liquid Chiller at end of this publication (pages CL-1 to CL-10). The check- list assures proper start-up of a unit, and provides a record of unit condition, application requirements, system infor- mation, and operation at initial start-up.

Do not attempt to start the chiller until following checks have been completed.

System Check

1.Check all auxiliary components, such as chilled fluid pumps, air-handling equipment, or other equipment to which the chiller supplies liquid. Consult manufacturer's instructions. Verify that any pump interlock contacts have been properly installed. If the unit If the unit has field-installed accessories, be sure all are properly in- stalled and wired correctly. Refer to unit wiring diagrams.

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Carrier 30RAP010-060 Pre-Start-Up, System Check, Configuring Demand Limit, Item Expansion Comment Entry Configuration

30RAP010-060 specifications

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