Carrier 30GTR Specifications download pdf (Page 42)

Table 22 — Operating Modes

MODE NO. ITEM EXPANSION DESCRIPTION

01 FSM CONTROLLING CHILLER Flotronic™ System Manager (FSM) is controlling the chiller

02 WSM CONTROLLING CHILLER Water System Manager (WSM) is controlling the chiller

03 MASTER/SLAVE CONTROL Lead/Lag Chiller control is enabled.

04 LOW SOURCE PROTECTION Not currently supported.

05 RAMP LOAD LIMITED Ramp load (pulldown) limiting in effect. In this mode, the rate

at which leaving ﬂuid temperature is dropped is limited to a

predetermined value to prevent compressor overloading. See

CRMP set point in the Set Point Select (SLCT) section of the

Conﬁguration mode. The pulldown limit can be modiﬁed, if de-

sired, 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 isa1to4hour temporary

override of the programmed schedule, forcing unit to Occupied

mode. Override can be implemented with unit under Local (En-

able) or CCN control. Override expires after each use.

07 LOW COOLER SUCTION TEMP A Circuit A capacity may be limited due to operation of this mode.

Control will attempt to correct this situation for up to 10 minutes

before shutting the circuit down. The control may decrease ca-

pacity when attempting to correct this problem. See Alarms and

Alerts section for more information.

08 LOW COOLER SUCTION TEMP B Circuit B capacity may be limited due to operation of this

mode. Control will attempt to correct this situation for up to

10 minutes before shutting the circuit down. The control may

decrease capacity when attempting to correct this problem.

See Alarms and Alerts section for more information.

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 (DELY) found un-

der Options 2 (OPT2) section of Conﬁguration mode.

11 LOW SUCTION SUPERHEAT A Circuit A capacity may be limited due to operation of this mode.

Control will attempt to correct this situation for up to 5 minutes

before shutting the circuit down. See Alarms and Alerts section

for more information.

12 LOW SUCTION SUPERHEAT B Circuit B capacity may be limited due to operation of this

mode. Control will attempt to correct this situation for up to

5 minutes before shutting the circuit down. See Alarms and

Alerts section for more information.

13 DUAL SETPOINT Dual set point mode is in effect. Chiller controls to CSP.1 dur-

ing occupied periods and CSP.2 during unoccupied periods.

Both CSP.1 and CSP.2 are located under COOL in the Set

Point mode.

14 TEMPERATURE RESET Temperature reset is in effect. In this mode, chiller is using

temperature reset to adjust leaving 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.

15 DEMAND LIMIT IN EFFECT Demand limit is in effect. This indicates that the capacity of the

chiller is being limited by demand limit control option. Because

of this limitation, the chiller may not be able to produce the de-

sired leaving ﬂuid temperature. Demand limit can be controlled

by switch inputs ora4to20mAsignal.

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 LO TMP COOL/HI TMP HEAT 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 HI TMP COOL/LO TMP HEAT 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.

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Carrier 30GTR Specifications Page 42

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