Specifications

25
CCN Control
— With CCN Operating Type control, the ma-
chine operates under CCN control as long as the Enable/Off/
Remote Contact Switch is in the Enable or Remote Contact
position (external contacts closed.) To operate under this
Operating Control, OPER must be set to CCN CONTROL. An
external CCN device, such as Chillervisor, controls the On/Off
state of the machine. When controlled by a Chillervisor, it is
recommended that the Auto Start When SM Lost (AU.SM) be
set to Yes.
Careful evaluation of Chilled Water Plant control should be
reviewed. In the event Local Control is established, be sure that
all pumps, valves, and other devices are capable of operating
properly. In the event of a loss of communication with the net-
work, the machine will start and be controlled locally. The
CCN device forces the variable CHIL_S_S to control the chill-
er. The Unit Run Status (STAT) will indicate the current status
of the machine (OFF, RUNNING, STOPPING or DELAY),
depending on the CCN command. The unit Occupied status
(OCC) will indicate the current occupied state according to the
CCN command and will be displayed as either NO or YES.
The Status Unit Control Type (CTRL) will be LOCAL OFF
when the Enable/Off/Remote Contact switch is Off. The Status
Unit Control Type will be CCN when the Enable/Off/Remote
Contact switch input is Closed and the CHIL_S_S variable is
Stop or Start.
For Dual Chiller Control applications, the Slave Chiller
must be enabled using the CCN CONTROL option.
Entering Fluid Control Option — The factory de-
fault for the chilled water fluid set point is controlling to the
leaving water temperature. An option to configure the machine
for entering water control is available. The control operation
remains the same except the control point is focused on the
entering water temperature, rather than the leaving water tem-
perature when configured.
To configure this option for the Touch Pilot™ display:
To configure this option for the Navigator™ display:
Heat Machine Option — The 30XW chiller with the
heat machine option can be configured for heating duty. The
heat machine option consists of air-cooled duty compressor(s),
water-cooled condenser with higher operating pressure, con-
denser entering and leaving water temperature thermistors and
condenser water flow switch.
The control will load compressors to satisfy the required
heating setpoint provided there is sufficient cooling load. Oper-
ating as a heat machine requires the unit configuration of the
Unit Type (TYPE) = 4 (Heat Machine), High Condensing Se-
lect (H.CON) = Yes (YES), and Heat/Cool Select (HC.SE)
parameters.
Heat/Cool Select (HC.SE) = 0 (Cooling) allows the unit to
operate in the cooling mode only.
Heat/Cool Select (HC.SE) = 1 (Heating) allows the unit to
operate in the heating mode only.
Heat/Cool Select (HC.SE) = 3 (Heat Cool Sw) allows the
unit to switch between cooling and heating based on a dry con-
tact input (open contacts = Cool, closed contacts = Heat). Use
of the Heat/Cool switch option requires field installed wiring to
Main Base Board input channel 14. Refer to 30XW wiring dia-
gram in Service Test section. Heat/Cool Select can also be
forced from communications (CCN point name HC_SEL).
To configure these options for the Touch Pilot™ display, see
Table 20A. To configure these options for the Navigator™ dis-
play, see Table 20B.
Table 20A — Configure Heat Machine Option
with Touch Pilot™ Display
Table 20B — Configure Heat Machine Option
with Navigator™ Display
Cooling Set Point Selection — Several options for
controlling the Leaving Chilled Water Set Point are offered and
are configured by the Cooling Set Point Select (Setpoint Se-
lect, SP.SE) variable. In addition to the Cooling Set Point Se-
lect, Ice Mode Enable discussed later in this book, and Heat
Cool Select (Heat/Cool Select, HC.SE) variables also have a
role in determining the set point of the machine. All units are
shipped from the factory with the Heat Cool Select set to 0.
All default set points are based on Leaving Water Control
(Entering Fluid Control, EWTO) set to No. Values must be
confirmed for the individual set points. Limits for the set points
are listed in the configurations noted below.
To configure these options for the Touch Pilot™ display, see
Table 21A. To configure these options for the Navigator™ dis-
play, see Table 21B.
Table 21A — Cooling Set Point Selection
with Touch Pilot™ Display
ITEM ITEM EXPANSION PATH VALUE
OPER
Operating Control
Typ e
Operating
Modes SLCT OPER
CCN
CONTROL
AU.SM
Auto Start when
SM Lost
Configuration SERV YES
DISPLAY NAME PATH
LINE
NO.
VALUE
Entering Fluid
Control
Service\
SERVICE1
5
No = Leaving Water Control
Yes = Entering Water Control
ITEM ITEM EXPANSION PATH VALUE
EWTO Entering Water
Control
Configuration SERV No = Leaving
Water Control
Yes = Entering
Water Control
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DISPLAY
NAME
PATH
LINE
NO.
VALUE
Unit Type
Main Menu Service
FACTORY
1
Default = 3
3 = Water Cooled
4 = Heat Machine
High
Condensing
Select
Main Menu Service
FACTORY
24
Default = No
Yes = Enabled
No = Disabled
Heat Cool
Select
Status GENUNIT 9
Default = 0
0 = Cool
1 = Heat
2 = Auto (not supported)
ITEM
ITEM
EXPANSION
PATH VALUE
TYPE Unit Type Configuration UNIT
Default = Water Cooled
Water Cooled
Heat Machine
H.CON
High
Condensing
Select
Configuration UNIT
Default = No
Yes = Enabled
No = Disabled
HC.SE
Heat Cool
Select
Operating
Mode SLCT
Default = Cooling
Cooling
Heating
Auto Chgover(not supported)
Heat Cool Sw
DISPLAY NAME PATH LINE NO. VALUE
Cooling Setpoint 1 Setpoint 2
Range: 14 to 70 F
(–10.0 to 21.1 C)
Default: 44 F (6.6 C)
Cooling Setpoint 2 Setpoint 3
Range: 14 to 70 F
(–10.0 to 21.1 C)
Default: 44 F (6.6 C)
Cooling Ice Setpoint Setpoint 4
Range: -20 to 32 F
(–28.9 to 0 C)
Default: 44 F (6.6 C)
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