Chilled Water Set Point Configuration - Carrier AquaForce B Series Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Table 20 — Unit States
STATE
Off Unit is commanded to be off
Unit is currently stopping (after a manual, emergency, or
Stopping
shutdown request). Next state will be Off.
Unit is in delay at start-up (waiting for the end of the On/Off
Delay
delay to be reached). Next state will be Running.
Unit compressor capacity is more that 0% (unit has started
Running
running)
Ready Unit compressor capacity is 0%. Unit is ready to start.
The compressor cannot start because of an override (SST,
Override
SCT, etc.)
Tripout Unit is Off due to an alarm
Test Unit is in Quick Test
Table 21 summarizes the unit control method and stop or go
status with regard to the following parameters set in the Carrier
Controller module:
• Machine Control Method: Machine Control Method as se-
lected on the unit Start/Stop screen.
• CHIL_S_S: Current CCN chiller start/stop force com-
mand (enable/disable). Main Menu

ters Net:Cmd Start/Stop.
• ONOFF_SW: Start-stop contact status when unit is under re-
mote operating type. Main Menu
mote On/Off Switch.
• CHIL_OCC: Chiller occupied state. If the occupancy
override input switch is closed, the chiller remains occu-
pied regardless of the set point scheduled selection. Main

Menu General Parameters
• MS_CTRL: Master control type. This parameter status will
determine if the master unit is going to be controlled locally,
remotely, or through CCN. Main Menu

Menu Master Slave Control (0=disabled, 1=master,
2=slave).
• EMSTOP: CCN emergency stop command (enable/disable).

Main Menu General Parameters
MACHINE CONTROL METHOD
Local Off
Local On
Local Schedule
Remote
CCN
Master
—
CHIL_OCC — Chiller Occupied State
CHIL_S_S — CCN Chiller Start/Stop Command
EMSTOP — Emergency Stop
DESCRIPTION

General Parame-
 
Inputs Status

Net:Cmd Occupied.

Maintenance

Emergency Stop.
Table 21 — Start/Stop Control
CHIL_S_S ONOFF_SW MS-CTRL
— —
— —
— —
— —
— Open
— —
Closed
Disable —
— —
Enable —
— —
— Open
— —
Disable —
— —
— —
— Closed
Enable
— —
LEGEND
MA St
MS-CTRL
ONOFF_SW —
• Alarm shutdown: Unit is totally stopped due to alarm.
The Machine Control Method and Parameter Status combina-
tions listed in Table 21 will determine the actual unit running
state.
NOTE: When changing from one Machine Control Method
(Local On, Local Schedule, Network, Remote, or Master) to
another, the unit will observe a transition through the Off state
before being allowed to start again. At this time the on-to-off
delay is always applied.

Chilled Water Set Point Configuration

The chilled water set point and fluid type configuration will de-
termine the chiller operating conditions.
FLUID SET POINT CONTROL LOCATION
The factory default for the chilled water fluid set point is to
control to the leaving water temperature. An option to config-
ure the machine for entering water control is available. To con-
figure this option go to Main Menu

Service Parameters. The default for Entering Fluid Con-
trol is Off (leaving fluid control is the default condition). To
enable Entering Water Control, change Entering Fluid Con-
trol to On. Entering Water Control is recommended for con-
stant flow applications only.
COOLING SET POINT SELECTION
Re-
The Control Point (shown in the lower right corner of the Home
Screen, or Main Menu
Point) represents the water temperature that the unit must pro-
duce. The unit will vary the capacity depending on the load condi-
tions in order to satisfy the set point. The Control Point
(CTRL_PNT) is calculated based on the Active Setpoint (Main

Menu General Parameters) [Main Menu and General Param-
eters in bold italics]. and the reset calculation, where Control Point
= Current Setpoint + Temperature Reset. (See "Temperature Re-
set" on page 38.) Control Point can be written to by the Building
Management System, instead of the set point calculation only if
Network is selected as the Machine Control Method for the unit.
See Main Menu
mote=2 to verify operating type.
PARAMETER STATUS
CHIL_OCC EMSTOP
— —
— — Disable
— Yes Disable
— No
— —
— No
Yes
— —
— No
— Yes Disabled
Local No
Remote —
Remote No
CCN —
CCN No
Local Yes Disable
Remote Yes Disable
CCN Yes Disable
Enable
— —
— Master/Slave Operating Type
— Master/Slave Control
Remote On/Off Switch
27

Configuration Menu

General Parameters
 
General Parameters Local=0 Net.-1 Re-
OPERATING
Alarm
TYPE
Shutdown
— — Local
No Local
No Local
— — Local
— — Remote
— — Remote
— — Remote
— — CCN
— — CCN
No CCN
— — Local
— — Remote
— — Remote
— — CCN
— — CCN
No Local
No Remote
No CCN
— —
— Yes —

Control
UNIT
STATUS
Off
On
On
Off
Off
Off
On
Off
Off
On
Off
Off
Off
Off
Off
On
On
On
Off
Off