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).
To configure this option with the Carrier Controller display:
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.
Fig. 39 — Example: OAT Reset
DISPLAY NAME PATH VALUE
Cooling Reset
Select
Main Menu
Configuration Menu
Reset Configuration
Default = 1
0=None,
1=OAT
2=Delta T,
3=4 to 20mA control
4=Space Temp
OAT No Reset
Value
Default = 14°F (7.8°C)
Range 14 to 125°F
(7.8 to 69.4°C)
OAT Full Reset
Value
Default = 14°F (7.8°C)
Range 14 to 125°F
(7.8 to 69.4°C)
Cooling Reset
Deg. Value
Default = 0°F (0°C)
Range –30 to 30°F
(–16.7 to 16.6°C)
0
2
4
6
8
10
12
14
16
Outdoor Temperature (deg F)
Reset Amount (de
g F)
Cooling Reset
Deg. Value
= 15 F (8.3 C)
(cr_deg)
OAT No Reset Value
= 85 F (29.4 C)
(oat_hrno)
OAT Full Reset Value
= 55 F (12.8 C)
(oat_hrfu)
20 40 60 80 100 120 0
a30-5887
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