Carrier 30GTR Specifications download pdf (Page 45)

Demand Limit — Demand Limit is a feature that allows

the unit capacity to be limited during periods of peak energy

usage. There are 3 types of demand limiting that can be con-

ﬁgured. The ﬁrst type is through 2-stage switch control, which

will reduce the maximum capacity to 2 user-conﬁgurable per-

centages. The second type is by 4 to 20 mAsignal input which

will reduce the maximum capacity linearly between 100%

ata4mAinput signal (no reduction) down to the user-

conﬁgurable level at a 20 mA input signal. The third type

uses the CNN Loadshed module and has the ability to limit

the current operating capacity to maximum and further re-

duce the capacity if required.

NOTE: The 2-stage switch control and 4 to 20 mA input

signal types of demand limiting require the Energy Manage-

ment Module (EMM).

To use Demand Limit, select the type of demand limiting

to use. Then conﬁgure the Demand Limit set points based on

the type selected.

DEMAND LIMIT (2-Stage Switch Controlled) — To con-

ﬁgure Demand Limit for 2-stage switch control set the De-

mand Limit Select (DMDC) to 1. Then conﬁgure the 2 De-

mand Limit Switch points (DLS1 and DLS2) to the desired

capacity limit. See Table 26. Capacity steps are controlled

by 2 relay switch inputs ﬁeld wired to TB6 as shown in

Fig. 2-4.

For Demand Limit by 2-stage switch control, closing the

ﬁrst stage demand limit contact will put the unit on the ﬁrst

demand limit level. The unit will not exceed the percentage

of capacity entered as Demand Limit Switch 1 set point. Clos-

ing contacts on the second demand limit switch prevents the

unit from exceeding the capacity entered as Demand Limit

Switch 2 set point. The demand limit stage that is set to the

lowest demand takes priority if both demand limit inputs are

closed. If the demand limit percentage does not match unit

staging, the unit will limit capacity to the closest capacity

stage.

To disable demand limit conﬁgure the DMDC to 0. See

Table 25.

EXTERNALLY POWERED DEMAND LIMIT (4 to 20 mA

Controlled) — To conﬁgure Demand Limit for 4 to 20 mA

control set the Demand Limit Select (DMDC) to 2. Then

conﬁgure the Demand Limit at 20 mA (DM20) to the maxi-

mum loadshed value desired. The control will reduce allow-

able capacity to this level for the 20 mAsignal. See Table 26

and Fig. 21.

DEMAND LIMIT (CCN Loadshed Controlled) — To con-

ﬁgure Demand Limit for CCN Loadshed control set the De-

mand Limit Select (DMDC) to 3. Then conﬁgure the Load-

shed Group Number (SHNM), Loadshed Demand Delta

(SHDL), and Maximum Loadshed Time (SHTM). See

Table 26.

The Loadshed Group number is established by the CCN

system designer. The PIC (product integrated control) will

respond to a Redline command from the Loadshed control.

When the Redline command is received, the current stage of

capacity is set to the maximum stages available. Should the

loadshed control send a Loadshed command, the PIC will

reduce the current stages by the value entered for Loadshed

Demand delta. The Maximum Loadshed Time is the deﬁnes

the maximum length of time that a loadshed condition is al-

lowed to exist. The control will disable the Redline/Loadshed

command if no Cancel command has been received within

the conﬁgured maximum loadshed time limit.

Table 26 — Conﬁguring Demand Limit

MODE

KEYPAD

ENTRY

SUB-MODE

KEYPAD

ENTRY

ITEM DISPLAY ITEM EXPANSION COMMENT

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

RSET

ENTER

CRST X Cooling Reset Type

CRT1 XXX.X °F

No Cool Reset

Temperature

CRT2 XXX.X °F

Full Cool Reset

Temperature

DGRC XX.X DF Degrees Cool Reset

DMDC X Demand Limit Select

Default: 0

0 = None

1 = Switch

2=4to20mAInput

3 = CCN Loadshed

DM20 XXX %

Demand Limit at

20 mA

Default: 100%

Range: 0 to 100

SHNM XXX

Loadshed Group

Number

Default: 0

Range: 0 to 99

SHDL XXX%

Loadshed Demand

Delta

Default: 0%

Range: 0 to 60%

SHTM XXX MIN

Maximum Loadshed

Time

Default: 60 min.

Range: 0 to 120 min.

DLS1 XXX %

Demand Limit

Switch 1

Default: 80%

Range: 0 to 100%

DLS2 XXX%

Demand Limit

Switch 2

Default: 50%

Range: 0 to 100

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Carrier 30GTR Specifications Page 45

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