Cooling Set Point Select; Ice Mode; Cooler Pump Control; Alarm Routing - Carrier AquaSnap 30MPA Series Controls, Start-Up, Operation, Service, And Troubleshooting

will be displayed in Time Clock
Override Hours) and will count down as the time period pro-
gresses. See Table 22.
Once a non-zero value has been entered, the unit will re-
sume an occupied period for the duration of the time pro-
grammed. The number of hours in the override time period will
be displayed in OVR.T and will count down as the time period
progresses. This value cannot be changed until the override pe-
riod has expired or is cancelled. The override time period can
be cancelled by changing the OVR.T value to 0. This can be
done at the unit's interface device or through CCN communi-
cations by writing to the point OVR_EXT.
Table 23 — Space Temperature Override Required
Configuration
TIME CLOCK MODE
SUBMODE ITEM DISPLAY
OVR OVR.L X
Timed Override from CCN — A timed override period can be
initiated through CCN communications by writing to the point
OVR_EXT. This point has a range of 0 to 4 hours and should
be set for the desired amount of time.
The number of hours in the override time period will be dis-

played in Time Clock OVR
Hours) and will count down as the time period progresses. See
Table 22.
Once a non-zero value has been entered, the unit will re-
sume an occupied period for the duration of the time pro-
grammed. The number of hours in the override time period will
be displayed in OVR.T and will count down as the time period
progresses. This value cannot be changed until the override pe-
riod has expired or is cancelled. The override time period can
be cancelled by changing the OVR.T value to 0. This can be
done at the unit's interface device or through CCN communi-
cations by writing to the point OVR_EXT.
CCN CONTROL — With the control method set to CCN
Control, CTRL=3 (CCN), an external CCN device controls the
On/Off state of the machine. This CCN device forces the point
CHIL_S_S between Start/Stop to control the unit.
Under normal operation, Run Status
(Control Mode) will be 1 (Off Local) when the Enable/Off/Re-
mote Control switch is in the Off position or in the Remote
Control position with the remote external contacts open. With
the Enable/Off/Remote Control switch in the Enable position
or in Remote Control position with the remote external con-
tacts closed, the Control Mode will be 2 (Off CCN) when the
CHIL_S_S variable is "Stop." Similarly, the control mode will
be 6 (On CCN) when the CHIL_S_S variable is "Start."
Units controlled via communications by a separate third-
party building automation system through a translator or UPC
Open Controller must be set to CCN Control, CTRL=3. If the
unit is to be monitored only via communications, CTRL=3
(CCN Control) is not required.
Emergency Stop — A controls feature exists to shut down the
machine in the event of an emergency. Writing to the CCN
Point EMSTOP, the command "EMSTOP" will force the ma-
chine to stop all mechanical cooling immediately and shut
down. While this feature is enabled, the Control Mode Run
 
Status VIEW STAT=4 (Emergency) will be displayed. For
the machine to operate normally, the EMSTOP point value
should be "ENABLE."

Cooling Set Point Select

SINGLE — Unit operation is based on Cooling Set Point 1
 
(Set Points COOL CSP.1).
DUAL SWITCH — Unit operation is based on Cooling Set

Point 1 (Set Points COOL
 
OVR OVR.T (Timed
ITEM
COMMENT
DESCRIPTION
Override Time Default: 0
LImit Range: 0 to 4

OVR.T (Timed Override
 
VIEW STAT

CSP.1) when the Dual Set
Point switch contacts are open and Cooling Set Point 2 (Set
 
Points COOL CSP.2) when they are closed.
DUAL CCN OCCUPIED — Unit operation is based on
Cooling Set Point 1 (Set Points
Occupied mode and
 
Points COOL CSP.2) during the Unoccupied mode as
configured under the local occupancy schedule accessible only
from CCN. Schedule Number in Table SCHEDOVR (see Ap-
pendix B) 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 24.
4 TO 20 mA INPUT — Unit operation is based on an external
4 to 20 mA signal input to the Energy Management Module
(EMM).
When Ice Mode is enabled, Cooling Setpoint
Ice Mode —
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 Setpoint 1
(CSP.1) during the Occupied mode, Ice Setpoint (CSP.3)
during the Unoccupied mode with the Ice Done contacts open
and Cooling Setpoint 2 (CSP.2) during the Unoccupied mode
with the Ice Done contacts closed. These 3 set points can be
utilized to develop your specific control strategy. Ice Mode is
not compatible with the Multi-Chiller Controller Accessory
Panel.
Table 24 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.
Cooler Pump Control —
chines are configured with the Cooler Pump Control (Configu-
 
ration OPT1 CPC) = ON.
The maximum load allowed for the Chilled Water Pump
Starter is 5 VA sealed, 10 VA inrush at 24 volts. The starter coil
is powered from the chiller control system. The starter should
be wired between LVT 24 and TB3-1. If equipped, the field-in-
stalled chilled water pump starter auxiliary contacts should be
connected in series with the chilled water flow switch between
LVT 16 and LVT 17.
Alarm Routing —
allows for alarm broadcasting.
ALARM ROUTING CONTROL — Alarms recorded on
the 30MP unit can be routed through the CCN. To configure
this option, the ComfortLink control must be configured to
determine which CCN elements will receive and process
alarms. Input for the decision consists of eight digits, each of
which can be set to either 0 or 1. Setting a digit to 1 specifies
that alarms will be sent to the system element that corresponds
to that digit. Setting all digits to 0 disables alarm processing.
The factory default is 00000000. See Figure 16. The default
setting is based on the assumption that the unit will not be con-
nected to a network. If the network does not contain a Com-
fortVIEW™, ComfortWORKS™, TeLink, DataLINK™, or
BAClink module, enabling this feature will only add unneces-
sary activity to the CCN communication bus.
The CCN Point ALRM_CNT is the variable and can be
modified with ComfortVIEW software or Network Service
Tool only. It cannot be modified with the scrolling marquee or
Navigator™ display.
Typical configuration of the Alarm Routing variable is
11010000. This Alarm Routing status will transmit alarms to
ComfortVIEW software, TeLink, BAClink, and DataLINK.
Alarm routing is not supported with the LON Translator.
25
 
COOL CSP.1) during the
Cooling Set Point
The AquaSnap ® 30MP ma-
A CCN feature within the 30MP units
2 (Set