Operating Modes; Startup Delay In Effect; Second Setpoint In Use; Reset In Effect - Carrier AquaForce 30XV140 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 difference in capacity
between lead and lag less than 20%. The master will then be
responsible for water loop capacity calculation, and will de-
termine 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  Configuration Menu  Master Slave config
Lag Unit Pump Control). The internal algorithm of the lead
chiller will control capacity of the lead chiller.
Operating
Operating Modes —
modes that affect normal operation of the equipment. More than
one operating mode can be in effect at the same time. Some
operating modes have corresponding capacity control overrides
(see the Capacity Control Overrides section on page 41).
For the Touch Pilot™ 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 31 for a list of operating modes.
Table 31 — 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

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 Min-
utes Off Time (Main Menu  Configuration Menu  General
Configuration  Unit Off to On Delay) timer is active. The
unit will not start until the timer has expired. The mode will ter-
minate when the timer expires.
SECOND SETPOINT IN USE — This mode is checked for
when the unit is ON. The mode is active when Cooling Setpoint
2 (Main Menu  Setpoint Table  Cooling Setpoint 2) or Cool-
ing Ice Setpoint (Main Menu  Setpoint Table  Cooling Ice
Setpoint) is in use. While in this mode, the Current Setpoint
(Main Menu  General Parameters  Current Setpoint) will
show the Cooling Setpoint 2 or Cooling Ice Setpoint value.
While in this mode the unit will operate to the Cooling Set-
point 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 Se-
lect (Main Menu  Configuration Menu Reset Configu-
ration  Cooling Reset Select ) is enabled by setting the
modes are override
®
Intelligence
DESCRIPTION STATUS
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
Yes/No
value to 1 = Outside Air Temperature, 2 = Fluid Delta T, 3 =
4-20 mA Input, 4 = Space Temperature) and reset is active.
While in this mode, the Current Setpoint (Main Menu 
General Parameters  Current Setpoint) will be modified ac-
cording to the programmed information and will be displayed
as the Control Point (Main Menu  General Parameters 
Control Point). The mode will terminate when the Temperature
Reset is not modifying the active leaving water set point, caus-
ing 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  Configuration Menu  General
Configuration  Demand Limit Type Select) is enabled either
by setting the value to 1 = Switch Control or 2 = 4-20mA Con-
trol, or setting the Night Capacity Limit (Main Menu  Con-
figuration Menu  General Configuration  Night Capacity
Limit). The Active Demand Limit Value (Main Menu  Gen-
eral Parameters  Active Demand Limit Value) will display
the current demand limit according to the programmed infor-
mation 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 al-
ways checked. The mode is active when the Evaporator
Pump Sequence (Main Menu  Configuration Menu 
Pump Configuration  Evaporator Pumps Sequence) value
is set to 2 = Two Pumps Automatic Changeover, and the
Pump Auto Rotation Delay (Main Menu  Configuration
Menu  Pump Configuration  Pump Auto Rotation De-
lay) 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 operation has been completed.
PUMP PERIODIC START — This mode is active when the
evaporator pump is started due to the periodic pump start config-
uration (Main Menu  Configuration Menu  Pump Configu-
ration  Pump Sticking 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 machine 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 terminate 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 pro-
grammed, one as the master (Main Menu  Configuration
Menu  Master Slave config  Master/Slave select = 1) and
the other as a slave (Main Menu  Configuration Menu 
Master Slave config  Master/Slave select = 2). Both the mas-
ter and slave machines will respond to the capacity control
commands issued by the master controller. This may include
control point changes and demand limit commands. This mode
will terminate when Master Slave Control has been disabled
(Main Menu  Configuration Menu  Master Slave Config
 Master/Slave Select=0).
ICE MODE IN EFFECT — This mode is checked for when
the unit is ON. This mode is active when the Cooling Ice Set-
point (Main Menu  Setpoint Table  Cooling Ice Setpoint)
is in use. While in this mode, the Current Setpoint (Main Menu
 General Parameters  Current Setpoint) will show the
Cooling Ice Setpoint value and the unit will operate to that
value. This mode will terminate when the Ice Cooling Ice Set-
point is no longer in use (ICE DONE switch is closed).
The electronic control uses up to 15 thermistors
Sensors —
to sense temperatures and up to 10 transducers to sense pres-
sure for controlling chiller operation. These sensors are out-
lined below.
48