Operating Modes - Carrier AquaForce B Series Controls, Start-Up, Operation, Service And Troubleshooting Instructions

When the pulldown time and lag start time have elapsed and the
Combined Leaving Chilled Water Temperature is more than 3°F
(1.7°C) above the set point, then the lag chiller is started. If the
lag chiller's water pump was not started when the machines
went into occupied mode, the lag chiller water pump will be
started. The lag chiller will start with the master chiller forcing
the lag chiller demand limit value (LAG_LIM) to the master's
demand limit value. If lead/lag capacity balance is selected, once
the lag chiller has started, the master will try to keep the differ-
ence in capacity between lead and lag less than 20%. The master
will then be responsible for water loop capacity calculation, and
will determine which chiller, the lead or lag, will increase or de-
crease capacity. When the load reduces, the lag chiller will be the
first chiller to unload. To accomplish this, the lead chiller set
point is decreased by 4°F (–2.2°C) until the lag chiller unloads.
PUMP OPERATION
For parallel chiller pump operation, the lead chiller's water pump
will be started. The lag chiller's water pump will be maintained off
if Lag Unit Pump Control = 0 (Main Menu

Menu Master/Slave Config
internal algorithm of the lead chiller will control capacity of the
lead chiller.

Operating Modes

Operating modes are override modes that affect normal opera-
tion of the equipment. More than one operating mode can be in
effect at the same time. Some operating modes have corre-
sponding capacity control overrides (see the Capacity Control
Overrides section on page 47).
For the Carrier Controller display, the status of the operating
modes can be found by accessing the Modes Menu (Main Menu

Modes). Each operating mode and its status (Yes = active, No =
inactive) is listed. See Table 35 for a list of operating modes.
Table 35 — 30XV with Greenspeed
Operating Modes
OPERATING
MODE NUMBER
1 Startup Delay in Effect
2 Second Setpoint in Use
3 Reset in Effect
4 Demand Limit Active
5 Evaporator Pump Rotation
6 Pump Periodic Start
7 Night Mode Active
8 Master Slave Active
12 Ice Mode in Effect
STARTUP DELAY IN EFFECT
This mode is checked for when the unit is started. This mode is
active when the Minutes Off Time (Main Menu

tion Menu General Configuration
lay) timer is active. The unit will not start until the timer has
expired. The mode will terminate when the timer expires.
SECOND SETPOINT IN USE
This mode is checked for when the unit is ON. The mode is ac-
tive when Cooling Setpoint 2 (Main Menu

Cooling Setpoint 2) or Cooling Ice Setpoint (Main Menu
 
Setpoint Table Cooling Ice Setpoint) is in use. While in
this mode, the Current Setpoint (Main Menu

rameters Current Setpoint) will show the Cooling Setpoint
2 or Cooling Ice Setpoint value.
While in this mode the unit will operate to the Cooling Setpoint
2 or Cooling Ice Setpoint. The mode will terminate when the
second setpoint is no longer in use.
RESET IN EFFECT
This mode is checked for when the unit is ON. The mode will be
active when Cooling Reset Select (Main Menu

Configuration

Lag Unit Pump Control). The
® Intelligence
DESCRIPTION STATUS
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No

Configura-

Unit Off to On De-

Setpoint Table

General Pa-

Configuration

Menu Reset Configuration
abled by setting the value to 1 = Outside Air Temperature, 2 = Flu-
id Delta T, 3 = 4 to 20 mA Input, 4 = Space Temperature) and reset
is active.
While in this mode, the Current Setpoint (Main Menu

eral Parameters Current Setpoint) will be modified ac-
cording to the programmed information and will be displayed
as the Control Point (Main Menu
Control Point). The mode will terminate when the Tempera-
ture Reset is not modifying the active leaving water set point,
causing the Current Setpoint to equal the Control Point.
DEMAND LIMIT ACTIVE
This mode is checked for when the unit is ON. The mode is active
when Demand Limit Type Select (Main Menu

Menu General Configuration
is enabled either by setting the value to 1 = Switch Control or 2 = 4
to 20mA Control, or setting the Night Capacity Limit (Main

Menu Configuration Menu
Night Capacity Limit). The Active Demand Limit Value (Main

Menu General Parameters
will display the current demand limit according to the pro-
grammed information and the unit's capacity will be reduced to
the amount shown or lower. The mode will terminate when the
Demand Limit command has been removed.
EVAPORATOR PUMP ROTATION
This mode is always checked. The mode is active when the
Evaporator Pump Sequence (Main Menu

Menu Pump Configuration
quence) value is set to 2 = Two Pumps Automatic Changeover,
and the Pump Auto Rotation Delay (Main Menu

tion Menu Pump Configuration
Delay) has expired. The control will switch the operation of the
pumps. The lead pump will operate normally. The lag pump will
be started, becoming the lead, and then the original lead pump
will be shut down. This mode will terminate when the pump op-
eration has been completed.
PUMP PERIODIC START
This mode is active when the evaporator pump is started due to
the periodic pump start configuration (Main Menu

uration Menu Pump Configuration
Protection = YES). If the pump has not run that day, a pump
will be started and will run for 2 seconds at 2:00 PM. If the ma-
chine is configured for dual pumps, Pump 1 will run on even
days (such as the day 2, 4, 6 of the month). Pump 2 will run on
odd days (such as day 1,3, 5 of the month). The mode will ter-
minate when the pump shuts down.
MASTER SLAVE ACTIVE
This mode is checked for if the machine is ON. This mode is
active if Master Slave Control has been enabled. This occurs
when two machines are programmed, one as the master (Main

Menu Configuration Menu
Master/Slave select = Master (1)) and the other as a slave

(Main Menu Configuration Menu

Master/Slave select = Slave (2)). Both the master and slave
machines will respond to the capacity control commands is-
sued by the master controller. This may include control point
changes and demand limit commands. This mode will termi-
nate when Master Slave Control has been disabled (Main

Menu Configuration Menu
Master/Slave Select = Disable (0)).
ICE MODE IN EFFECT
This mode is checked for when the unit is ON. This mode is
active when the Cooling Ice Setpoint (Main Menu

Table Cooling Ice Setpoint) is in use. While in this mode,
the Current Setpoint (Main Menu
Current Setpoint) will show the Cooling Ice Setpoint value
56

Cooling Reset Select) is en-

Gen-

General Parameters

Configuration

Demand Limit Type Select)

General Configuration

Active Demand Limit Value)

Configuration

Evaporator Pumps Se-

Configura-

Pump Auto Rotation

Config-

Pump Sticking

Master/Slave Config

Master/Slave Config

Master Slave Config

Setpoint

General Parameters




