Carrier AquaForce B Series Controls, Start-Up, Operation, Service And Troubleshooting Instructions page 41

OUTSIDE AIR TEMPERATURE RESET
The control system is capable of temperature reset based on
OAT. Typically as the outdoor temperature decreases so does
building cooling load. The chilled water temperature can be in-
creased to lower energy usage while still meeting load demand.
To use OAT Reset, four variables must be configured: Cooling
Reset Select, OAT No Reset Value (outdoor temperature at
which no reset is required), OAT Full Reset Value (outdoor
temperature at which full reset is required), and Cooling Reset
Deg Value (the amount of temperature reset desired).
16
14
12
10
Cooling Reset
8 Deg. Value
= 15 F (8.3 C)
6
4
2
0
0
(cr_deg)
OAT Full Reset Value
= 55 F (12.8 C)
(oat_hrfu)
20 40
Fig. 39 — Example: OAT Reset
To configure this option with the Carrier Controller display:
DISPLAY NAME
Cooling Reset
Select
OAT No Reset
Value
OAT Full Reset
Value
Cooling Reset
Deg. Value
In the example in Fig. 39, the OAT reset provides 0°F (0°C)
chilled water set point reset at 85°F (29.4°C) OAT and 15°F
(8.3°C) reset at 55°F (12.8°C) OAT.
60 80
Outdoor Temperature (deg F)
41
PATH
Default = 1
0=None,
1=OAT
2=Delta T,
3=4 to 20mA control
4=Space Temp

Default = 14°F (7.8°C)
Main Menu

Range 14 to 125°F
Configuration Menu
(7.8 to 69.4°C)
Reset Configuration
Default = 14°F (7.8°C)
Range 14 to 125°F
(7.8 to 69.4°C)
Default = 0°F (0°C)
Range –30 to 30°F
(–16.7 to 16.6°C)
OAT No Reset Value
= 85 F (29.4 C)
(oat_hrno)
100
a30-5887
VALUE
120