Table 14 — Operating Modes

 

 

 

MODE

ITEM EXPANSION

DESCRIPTION

NO.

 

 

01

CSM CONTROLLING CHILLER

Chillervisor System Manager (CSM) is controlling the chiller.

 

 

 

02

WSM CONTROLLING CHILLER

Water System Manager (WSM) is controlling the chiller.

 

 

 

03

MASTER/SLAVE CONTROL

Dual Chiller control is enabled.

 

 

 

 

RAMP LOAD LIMITED

Ramp load (pull-down) limiting in effect. In this mode, the rate at which leaving fluid temperature

05

 

is dropped is limited to a predetermined value to prevent compressor overloading. See Cooling

 

Ramp Loading (ConfigurationSLCTCRMP). The pull-down limit can be modified, if

 

 

desired, to any rate from 0.2° F to 2° F (0.1° to 1° C)/minute.

 

 

 

06

TIMED OVERRIDE IN EFFECT

Timed override is in effect. This is a 1 to 4 hour temporary override of the programmed

 

schedule, forcing unit to Occupied mode. Override can be implemented with unit under

 

 

Local (Enable) or CCN (Carrier Comfort Network®) control. Override expires after each use.

 

LOW COOLER SUCTION TEMPA

Circuit A cooler Freeze Protection mode. At least one compressor must be on, and the Sat-

 

 

urated Suction Temperature is not increasing greater than 1.1° F (0.6° C) in 10 seconds. If

 

 

the saturated suction temperature is less than the Brine Freeze Point (Set PointsFRZ

07

 

BR.FZ) minus 6° F (3.4° C) and less than the leaving fluid temperature minus 14° F

 

(7.8° C) for 2 minutes, a stage of capacity will be removed from the circuit. Or, If the satu-

 

 

 

 

rated suction temperature is less than the Brine Freeze Point minus 14° F (7.8° C), for

 

 

90 seconds, a stage of capacity will be removed from the circuit. The control will continue to

 

 

decrease capacity as long as either condition exists.

 

 

 

 

LOW COOLER SUCTION TEMPB

Circuit B cooler Freeze Protection mode. At least one compressor must be on, and the Sat-

 

 

urated Suction Temperature is not increasing greater than 1.1° F (0.6° C) in 10 seconds. If

 

 

the saturated suction temperature is less than the Brine Freeze Point (Set PointsFRZ

08

 

BR.FZ) minus 6° F (3.4° C) and less than the leaving fluid temperature minus 14° F

 

(7.8° C) for 2 minutes, a stage of capacity will be removed from the circuit. Or, If the satu-

 

 

 

 

rated suction temperature is less than the Brine Freeze Point minus 14° F (7.8° C), for

 

 

90 seconds, a stage of capacity will be removed from the circuit. The control will continue to

 

 

decrease capacity as long as either condition exists.

09

SLOW CHANGE OVERRIDE

Slow change override is in effect. The leaving fluid temperature is close to and moving

 

towards the control point.

 

 

 

 

 

10

MINIMUM OFF TIME ACTIVE

Chiller is being held off by Minutes Off Time (ConfigurationOPT2DELY).

 

 

 

 

DUAL SETPOINT

Dual Set Point mode is in effect. Chiller controls to Cooling Set Point 1 (Set PointsCOOL

13

 

CSP.1) during occupied periods and Cooling Set Point 2 (Set PointsCOOLCSP.2)

 

 

during unoccupied periods.

 

TEMPERATURE RESET

Temperature reset is in effect. In this mode, chiller is using temperature reset to adjust leav-

14

 

ing fluid set point upward and is currently controlling to the modified set point. The set point

 

can be modified based on return fluid, outdoor-air-temperature, space temperature, or 4 to

 

 

 

 

20 mA signal.

 

 

 

 

DEMAND/SOUND LIMITED

Demand limit is in effect. This indicates that the capacity of the chiller is being limited by

15

 

demand limit control option. Because of this limitation, the chiller may not be able to pro-

 

duce the desired leaving fluid temperature. Demand limit can be controlled by switch inputs

 

 

 

 

or a 4 to 20 mA signal.

 

 

 

16

COOLER FREEZE PROTECTION

Cooler fluid temperatures are approaching the Freeze point (see Alarms and Alerts section

 

for definition). The chiller will be shut down when either fluid temperature falls below the

 

 

Freeze point.

 

 

 

17

LOW TEMPERATURE COOLING

Chiller is in Cooling mode and the rate of change of the leaving fluid is negative and

 

decreasing faster than -0.5° F per minute. Error between leaving fluid and control point

 

 

exceeds fixed amount. Control will automatically unload the chiller if necessary.

 

 

 

18

HIGH TEMPERATURE COOLING

Chiller is in Cooling mode and the rate of change of the leaving fluid is positive and increasing.

 

Error between leaving fluid and control point exceeds fixed amount. Control will automatically

 

 

load the chiller if necessary to better match the increasing load.

19

MAKING ICE

Chiller is in an unoccupied mode and is using Cooling Set Point 3 (Set PointsCOOL

 

CSP.3) to make ice. The ice done input to the Energy Management Module (EMM) is open.

 

 

 

20

STORING ICE

Chiller is in an unoccupied mode and is controlling to Cooling Set Point 2 (Set PointsCOOL

 

CSP.2). The ice done input to the Energy Management Module (EMM) is closed.

 

 

 

 

HIGH SCT CIRCUIT A

Chiller is in a Cooling mode and the Saturated Condensing Temperature (SCT) is greater than

21

 

the calculated maximum limit. No additional stages of capacity will be added. Chiller capacity

 

may be reduced if SCT continues to rise to avoid high-pressure switch trips by reducing con-

 

 

 

 

densing temperature.

 

 

 

 

HIGH SCT CIRCUIT B

Chiller is in a Cooling mode and the Saturated Condensing Temperature (SCT) is greater than

22

 

the calculated maximum limit. No additional stages of capacity will be added. Chiller capacity

 

may be reduced if SCT continues to rise to avoid high-pressure switch trips by reducing con-

 

 

 

 

densing temperature.

 

 

 

23

MINIMUM COMP ON TIME

Cooling load may be satisfied, however control continues to operate compressor to ensure

 

proper oil return. May be an indication of oversized application, low fluid flow rate or low loop

 

 

volume.

 

 

 

 

PUMP OFF DELAY TIME

Cooling load is satisfied, however cooler pump continues to run for the number of minutes set

24

 

by the configuration variable Cooler Pump Shutdown Delay (ConfigurationOPT1

 

 

PM.DY).

 

 

 

25

LOW SOUND MODE

Chiller operates at higher condensing temperature and/or reduced capacity to minimize

 

overall unit noise during evening/night hours (ConfigurationOPT2LS.MD).

 

 

 

18

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Carrier 30RAP010-060 specifications Operating Modes, Mode Item Expansion Description

30RAP010-060 specifications

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