Dual Switch; Ice Mode - Carrier 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

Table 19 -- Control Methods and Cooling Set Points
PARAMETER
Heat Cool Ice Mode
Control Method Select Setpoint Select Enable
( OPER) (HC.SE) (SP.SE) (ICE.M)
Enable
0
(Switch Ctrl)
1
(Time Sched)
2
(CCN)
-- = No Effect
o
(Cool)
o
(Cool)
0
(Cool)
1
(Setpointl)
2
(Setpoint2)
3
(4-20mA Setp)
4
(Dual Setp Sw)
0
(Setpoint Occ)
Enable
Enable
Enable
Enable
Enable
Ice Done
UCE.D)
Open
Open
Open
Closed
Open
Closed
Open
Closed
Open
Dual Setpoint
Switch (DUAL)
Closed
Closed
Open
Closed
Closed
Open
Closed
Closed
Closed
m
m
m
m
m
Setpoint
Occupied (SP.OC)
Occupied
Unoccupied
Unoccupied
Occupied
Unoccupied
Unoccupied
SET
POINT
CSP.1
CSP.3
CSP.2
CSP.3
4-20 mA
CSP.1
CSP.3
CSP.2
CSR 1
CSP.2
CSP.3
CSP.2
CSR 1
C$P.2
CSP.3
CSP.2
CSP.1
CSP.2
CSR 3
UNIT RUN STATUS (Run Status--+VIEW_STAT)- As the
unit transitions from off to on and back to off. the Unit Run
Status will change based on the unit's operational status. The
variables ree: 0 (Oft), 1 (Running), 2 (Stopping), and 3 (Delay).
• 0 indicates the unit is Off due to the Enable/Off/Remote
Contact Switch, a time schedule or CCN command.
• 1 indicates the unit is operational.
• 2 indicates the unit is shutting down due to the command
to shut down fiom the Enable/Off/Remote Contact
Switch, a time schedule or CCN command.
• 3 indicates the unit has received a command to start fiom
Enable/Off/Remote Contact Switch, a time schedule or
CCN command, and is waiting for the start-up timer
(Configuration _OPTN--+DELY) to expire.
Cooling
Set Point Selection
(Operating
Modes
_SLCT_SP.SE)-
Several options for controlling the
Leaving Chilled Water Set Point are offered and are configured
by the Cooling Set Point Select vmiables. [n addition to the
Cooling Set Point Select, Ice Mode Enable (Configuration
--OPTN---)ICE.M), and Heat Cool Select (Operating
Modes---) SLCT---)HCSE) vmiables also have a role in deter-
mining the set point of the machine. All units are shipped from
the factory with the Heat Cool Select variable set to HC.SE=O
(Cooling). All set points me based on Leaving Water Control,
(Configuration ---)SER V---)EWTO=NO ).
In ;dl cases, there are limits on what values are allowed for
each set point. These values depend on the Cooler Fluid Type
(Cot_guration--_SERV--+FLUD) and the Brine Freeze Set
point (Cot_guration --+SERV--+LOSP). See Table 20.
Table 20 -- Configuration Set Point Limits
SET POINT LIMIT
Minimum*
Maximum
COOLER FLUID TYPE, FLUD
1 =Water ] 2 = Medium Brine
38 F (3.3 C) I 14 F (-10.0 C)
60 F (15.5 C)
*The minimum set point for Medium Temperature Brine applications
is related to the Brine Freeze Point. The set point is limited to be no
less than the Brine Freeze Point +5 ° F (2.8 ° C). See Table 19.
SET PO[NT 1 (Operating Modes--_LCT-+SP.SE=I) --
When Set Point Select is configured to 1, the unit's active
set point is based on Cooling Set Point 1 (Set Point
_'OOL _CSP. 1).
SET POINT 2 (Operating Modes--_S'LCT-+SP.SE=2) --
When Set Point Select is configured to 2, the unit's active
set point is based on Cooling Set Point 2 (Set Point
_4JOOL _CSP.2).
4 TO 20 mA INPUT (Operating Modes--+SLCT
---)SP.SE=3) -- When Set Point Select is configured to 3, the
unit's active set point is based on an external 4 to 20 mA signal
input to the Energy Management Module (EMM).
See Table 19 for Control Methods and Cooling Set Points.
The following equation is used to control the set point. See
Fig. 15.
Set Point = 10 + 70(mA - 4)/16 (deg F)
Set Point = - 12.2 + 38.9(mA - 4)/16 (deg C)
DUAL SWITCH (Operating Modes--)SLCT--_S'P.SE=4) --
When Set Point Select is configured to 4, the unit's active set
point is based on Cooling Set Point 1 (Set Point_COOL-e
CSP.I) when the Dual Set Point switch contacts me open and
Cooling Set Point 2 (Set Point_ZJOOL_ZJSP.2) when they
are closed.
ICE MODE -- Operation of the machine to make and store
ice can be accomplished many ways. The Energy Management
Module and an [ce Done Switch is requiled for operation in the
Ice Mode. [n this configuration, the machine can operate with
up to three cooling set points: Cooling Set Point 1 (Occupied)
(Set Point_COOL_CSP.I), Cooling Set Point 2 (Unoccu-
pied) (Set Point_COOL_CSP.2), and Ice Set Point
(Set Point _COOL _CSP.3).
SET PO[NT OCCUPANCY (Operating Modes
SLCT-+SP.SE=O) -- When Set point Select is configured to
0, the unit's active set point is based on Cooling Set Point 1
(Set Point_'OOL _CSP.I) during the occupied period while
operating under Time Cloek-+SCHI. ff the Time Clock
-eSCH2 is in use, the unit's active set point is based on
Cooling Set Point 1 (Set Point_COOL_CSP.I) during
the occupied period and Cooling Set Point 2 (Set Pohlt
_4JOOL _CSP.2) during the unoccupied period.
3O