Control Point; Temperature Reset - Carrier SmartVu Control Manual

SRDC-UG-2-14-000 REVISION DATE PAGE
19 Series Carrier®
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TM
SmartVu 2.3 Dec 4, 2020 73 OF 168
Controls IOM

5.7.2. Control Point

Capacity control is based on achieving and maintaining a CONTROL POINT temperature, which is the
sum of the valid set point (from the SETPOINT screen) and a temperature reset value.
In cooling mode, Control Point is equal to the set point plus temperature reset, while in heating Control
Point will be set point minus temperature reset.
The control point can be viewed directly on the main screen or "General Parameters" menu.

5.7.3. Temperature Reset

Three types of chilled water or brine reset are available and can be viewed or modified on the "Reset
Conf iguration" screen.
The def ault screen indicates when the chilled water reset is active. Control point Reset on the "General
Parameters" screen indicates the amount of reset.
To activate a reset type, access the RESETCFG screen and input all configuration information for that
reset type.
RESET TYPE 1: 4 to 20 mA TEMPERATURE RESET
Reset Type 1 is an "automatic" reset utilizing a 4 to 20 mA analog input signal provided from any
external sensor, controller, or other device which is appropriately configured.
At this type, Degrees Reset At 20 mA shall be configured in RESETCFG table.
RESET TYPE 2: REMOTE TEMPERATURE RESET
Reset Type 2 is an automatic water temperature reset based on a remote temperature sensor input
signal. This function can be accessed by the following configurations:
- Conf igure the remote temperature at no reset occurs (Remote temp –> NO RESET).
- Conf igure the remote temperature at full reset occurs (remote temp –> FULL RESET).
Finally, enter the amount of reset (Deg reset water DT f ull).
RESET TYPE 3 — CONTROLLED WATER TEMP DELTA RESET
Reset Type 3 is an automatic controlled water temperature reset based on heat exchanger temperature
dif ference. This function can be accessed by the following configurations:
- Conf igure the Controlled water temperature delta T at no reset occurs (Controlled Water DELTA T NO
RESET).
- Conf igure the Controlled water temperature delta T at f ull reset occurs (Controlled Water DELTA T
FULL RESET).
- Finally, enter the amount of reset (Deg reset water DT f ull).
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