Outside Air Temperature Reset - Carrier AQUAFORCE 30XA080-500 Controls, Start-Up, Operation, Service And Troubleshooting Instructions

To configure this option with the Navigator™ display:
ITEM ITEM EXPANSION
Cooling Reset
CRST Configuration
Type
Delta T No
CRT1 Setpoints
Reset Temp
Delta T Full
CRT2 Setpoints
Reset Temp
Degrees Cool
DGRC Setpoints
Reset
In the example in Fig. 24 using Return Water Temperature
Reset, the chilled water temperature will be reset by 5° F
(2.8° C) when the Fluid Temperature Difference is 2° F
(1.1° C) and 0° F (0° C) reset when the Temperature Difference
is 10° F.
OUTSIDE AIR TEMPERATURE RESET — The control sys-
tem is also capable of temperature reset based on outdoor-air
temperature (OAT).
To use Outdoor Air Temperature Reset, four variables must
be configured. Cooling Reset Type (Cooling Reset Select,
CRST) must be enabled. The outside temperature at which no
temperature reset is required, OAT No Reset Temp (OAT No
Reset Value, CRO1) must be set. The outside temperature at
which full temperature reset is required, OAT Full Reset Temp
(OAT Full Reset Value, CRO2) must be set. Finally, the
amount of temperature reset desired, Degrees Cool Reset
(Cooling Reset Deg. Value, DRGC) must be set.
To configure this option with the Touch Pilot™ display:
DISPLAY NAME PATH
Cooling Reset Main

Select Menu Config
OAT No Reset Main

Value Menu Setpoint
OAT Full Reset Main

Value Menu Setpoint
Cooling Reset Main

Deg. Value Menu Setpoint
To configure this option with the Navigator display:
ITEM ITEM EXPANSION
Cooling Reset
CRST Configuration
Type
CRO1 OAT No Reset
Setpoints
Temp
OAT Full Reset
CRO2 Setpoints
Temp
Degrees Cool
DGRC Setpoints
Reset
In the example in Fig. 25, the outdoor air temperature reset
example provides 0° F (0° C) chilled water set point reset at
85 F (29.4 C) outdoor-air temperature and 15° F (8.3° C) reset
at 55 F (12.8 C) outdoor-air temperature.
SPACE TEMPERATURE RESET — The control system is
also capable of temperature reset based on space temperature
(SPT). An accessory sensor must be used for SPT reset
(33ZCT55SPT). The Energy Management Module (EMM) is
also required for temperature reset using space temperature.
PATH VALUE
Default =

RSET No Reset
Delta T Temp
 Default =
COOL
0 F (0 C)

Default =
COOL
0 F (0 C)
 Default =
COOL
0 F (0 C)
LINE
VALUE
NO.
Default =0
 19 (No Reset)
USER
1 (OAT)
5 Default =

SETPOINT 14 F (–10 C)
Default =
 6
SETPOINT 14 F (–10 C)
Default =

13
SETPOINT 0 F (0 C)
PATH VALUE
Default =

RSET No Reset
Out Air Temp

Default =
COOL
14 F (–10 C)

Default =
COOL
14 F (–10 C)
 Default =
COOL
0 F (0 C)
To use Space Temperature Reset, four variables must be
configured. Cooling Reset Type (Cooling Reset Select, CRST)
must be enabled. The space temperature at which no tempera-
ture reset is required, Space T No Reset Temp (Space T No
Reset Value, CRS1) must be set. The space temperature at
which full temperature reset is required, Space T Full Reset
Temp (Space T Full Reset Value, CRS2) must be set. Finally,
the amount of temperature reset desired, Degrees Cool Reset
(Cooling Reset Deg. Value, DRGC), must be set.
To configure this option with the Touch Pilot display:
DISPLAY NAME
Cooling Reset Main Menu

Select Config
Space T No Main Menu

Reset Value Setpoint
Space T Full Main Menu

Reset Value Setpoint
Cooling Reset Main Menu

Deg. Value Setpoint
To configure this option with the Navigator display:
ITEM ITEM EXPANSION
CRST Cooling Reset Type Configuration
Space T No Reset
CRS1
Temp
Space T Full Reset
CRS2
Temp
DGRC Degrees Cool Reset Setpoints
In the space temperature reset example in Fig. 26, 0° F
(0° C) chilled water set point reset at 72 F (22.2 C) space
temperature and 6° F (3.3° C) reset at 68 F (20.0 C) space
temperature.
4-20 mA TEMPERATURE RESET — The control system is
also capable of temperature reset based on an externally pow-
ered 4 to 20 mA signal. The Energy Management Module
(EMM) is required for temperature reset using a 4 to 20 mA
signal.
To use 4-20 mA Temperature Reset, four variables must be
configured. Cooling Reset Type (Cooling Reset Select, CRST)
must be enabled. The milliamp signal at which no temperature
reset is required, Current No Reset Value (Current No Reset
Value, CRV1), must be set. The milliamp signal at which full
temperature reset is required, Current Full Reset Value
(Current Full Reset Value, CRV2), must be set. Finally, the
amount of temperature reset desired, Degrees Cool Reset
(Cooling Reset Deg. Value, DRGC), must be set.
Care should be taken when interfacing with other control
systems due to possible power supply differences such as a
full wave bridge versus a half wave rectification. Connec-
tion of control devices with different power supplies may
result in permanent damage. The ComfortLink™ controls
incorporate power supplies with half wave rectification. A
signal isolation device should be utilized if the signal gen-
erator incorporates a full wave bridge rectifier.
40
LINE
PATH VALUE
NO.
Default =0

19 (No Reset)
USER
4 (Space Temp)
Default =

11
SETPOINT 14 F (–10 C)
Default =
 12
SETPOINT 14 F (–10 C)
Default =

13
SETPOINT 0 F (0 C)
PATH VALUE
Default =

RSET No Reset
Space Temp
 Default =
Setpoints COOL
14 F (–10 C)

Default =
Setpoints COOL
14 F (–10 C)
 Default =
COOL
0 F (0 C)
CAUTION