Carrier GTR040-420 Spezifikationen PDF herunterladen (Seite 11)

OPERATING DATA

Control Methods

SWITCH — Unit is started and stopped manually by switch-

ing the ENABLE/OFF/REMOTE CONTACT switch from

OFF to ENABLE or by external contacts with the switch in the

REMOTE position. The unit can be enabled and disabled by

this action with all control methods.

7-DAY SCHEDULE — Unit is started and stopped in accor-

dance with the schedule configured under Time Clock mode.

This schedule can be configured from the Scrolling Marquee

Display or from CCN.

OCCUPANCY — Unit is started and stopped in accordance

with the occupancy schedule accessible only from CCN.

Schedule Number in Table SCHEDOVR must be configured

to 1 to utilize the local occupancy schedule, or 65-99 to utilize

a global schedule. If the Schedule Number is set to 0 the unit

will operate in a continuous 24-hr Occupied mode.

CCN — Unit is started and stopped by communication over

the CCN bus. The CHIL_S_S point in the A_UNIT table is

provided for this purpose.

Table 5 illustrates how the control method and cooling set

point select variables direct the operation of the chiller and the

set point to which it controls. The illustration also shows the

ON/OFF state of the machine for the given combinations.

Cooling Set Point Select

SINGLE — Unit operation is based on Cooling Set Point 1

(CSP1).

DUAL SWITCH — Unit operation is based on Cooling Set

Point 1 (CSP1) when the Dual Set Point switch contacts are

open and Cooling Set Point 2 (CSP2) when they are closed.

DUAL 7 DAY — Unit operation is based on Cooling Set

Point 1 (CSP1) during the occupied mode and Cool Set Point 2

(CSP2) during the unoccupied mode as configured under Time

clock mode. Control method must be configured to 0 (Switch).

DUAL CCN OCCUPIED — Unit operation is based on

Cooling Set Point 1 (CSP1) during the Occupied mode and

Cooling Set Point 2 (CSP2) during the Unoccupied mode as

configured under the local occupancy schedule accessible only

from CCN. Schedule Number in Table SCHEDOVR must be

configured to 1. If the Schedule Number is set to 0, the unit will

operate in a continuous 24-hr Occupied mode. Control method

must be configured to 0 (switch). See Table 5.

4 TO 20 mA INPUT — Unit operation is based on an exter-

nal 4 to 20 mA signal input to the Energy Management Module

(EMM).

Ice Mode —

When Ice Mode is enabled Cooling Set Point

Select must be set to Dual Switch, Dual 7 day or Dual CCN

Occupied and the Energy Management Module (EMM) must

be installed. Unit operation is based on Cooling Set Point 1

(CSP1) during the Occupied mode, Ice Set Point (CSP3)

during the Unoccupied mode with the Ice Done contacts open

and Cooling Set Point 2 (CSP2) during the Unoccupied mode

with the Ice Done contacts closed. These 3 set points can be

utilized to develop your specific control strategy.

Chilled Water Flow Switch —

Installation of a chilled

water flow switch is recommended to prevent operation with-

out flow through the cooler. Serious damage may result. It is

also recommended that the chiller be interlocked with the chill-

er water pump starter to provide additional protection. Inputs

for a chilled water pump flow switch and/or chilled water

pump interlock are provided. See page 73 of the Field Wiring

section for proper connection of the cooler flow switch and

pump interlock. DO NOT use the chilled water flow switch to

start and stop the chiller.

Cooler Pump Control —

The 30GTN,GUN chillers

can be configured for cooler pump control.

COOLER PUMP CONTROL (CPC, Configuration Mode,

sub-mode OPT1) — Proper configuration of the cooler pump

control is required to provide reliable chiller operation. The

factory default setting for cooler pump control is “OFF”. It is

recommended for all chillers that the cooler pump control be

utilized unless the chilled water pump runs continuously or the

chilled water system contains a suitable concentration of anti-

freeze solution. When the cooler pump control is configured

“ON,” the cooler pump relay will be energized when the chiller

enters an “ON” mode (i.e., ON LOCAL, ON TIME, ON

CCN). The cooler pump relay is also energized when certain

alarms are generated. The cooler pump relay should be used as

an override to the external pump control if cooler pump control

is not utilized.

If the cooler pump control relay output is not wired to con-

trol or override the operation of the chilled water pump an OFF

DELAY of 10 minutes must be provided after the chiller is dis-

abled to maintain cooler water flow during the pumpout period.

If cooler pump control is configured “OFF” or “ON” and

the chilled water flow switch/interlock does not close within

5 minutes after the unit is enabled and in an “ON” mode, alarm

A200 will be generated. If cooler pump control is turned “ON”

and the chilled water flow switch/interlock is closed when the

unit is enabled and enters an “ON” mode alarm A202 will be

generated. Alarm A201 will be generated whenever the cooler

pump interlock is open for at least 30 seconds during chiller

operation.

Sensors —

The electronic control uses 4 to 10 thermistors

to sense temperatures for controlling chiller operation. See

Table 2. These sensors are outlined below. See Fig. 7-10 for

thermistor locations. Thermistors T1-T9 are 5 kΩ at 77 F

(25 C). Thermistors T1, T2, T3-T6 and T7-T9 have different

temperature versus resistance and voltage drop performance.

Thermistor T10 is 10 kΩ at 77 F (25 C) and has a different tem-

perature vs resistance and voltage drop performance. See Ther-

mistors section on page 64 for temperature-resistance-voltage

drop characteristics.

Table 5 — Control Methods and Cooling Set Points

*Dual set point switch input used. CSP1 used when switch input is closed. CSP2 used when switch input is open.

†Cooling set point determined from 4 to 20 mA input to Energy Management Module (EMM) to terminals TB6-3,5.

CONTROL

TYPE

(CTRL)

OCCUPANCY

STATE

COOLING SET POINT SELECT (CLSP)

(single)

(dual, switch)

(dual, 7 day)

(dual, occ)

(4 to 20 mA)

0 (switch)

Occupied ON,CSP1 ON* ON,CSP1 ON,CSP1 ON†

Unoccupied ON,CSP1 ON* ON,CSP2 ON,CSP2 ON

1 (7 day)

Occupied ON,CSP1 ON* Illegal Illegal ON†

Unoccupied OFF OFF Illegal Illegal OFF

2 (Occupancy)

Occupied ON,CSP1 ON* Illegal Illegal ON†

Unoccupied OFF OFF Illegal Illegal OFF

3 (CCN)

Occupied ON,CSP1 ON* ON,CSP1 ON,CSP1 ON†

Unoccupied ON,CSP1 ON* ON,CSP2 ON,CSP2 ON†

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 103 104

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