MORNING
SPACE TEMPERATURE RESET SENSOR (VAV Only) Ð An accessory space temperature sensor wired to terminals T1 and T2 on the control module is required. Space tem- perature reset is used to reset the
in
1.The on/off status of the unit supply fan is determined.
2.If the fan is ``on,'' the sequence will check if the system is occupied.
3.If the system is occupied, the sequence will determine if the reset option is enabled.
4.If the reset option is enabled, the sequence will read the space temperature and compare it to the Occupied Cool set point. If the temperature is below the Occupied Cool set point, the algorithm will compute the reset value and compare this value against the reset limit. If it is greater than the reset limit, the sequence will use the reset limit as the reset value.
CB4
3.2 AMPS
BASE MODULE
CONTROL BOARD
INDOOR FAN RELAY COM
T
30
T29
T
28
TRAN2
B COM
SECONDARY
24 VOLT
| LEGEND | |
CB | Ð Circuit Breaker | |
COM | Ð Common | |
HIR | Ð | Heat Interlock Relay |
T | Ð | Terminal |
TRAN Ð Transformer
HIR
FIELD
INSTALLED
(HN61KK040)
(24V, 9.5VA)
Fig. 42 Ð Heat Interlock Relay Wiring
BASE MODULE
CONTROL BOARD
(+) T11
LEGEND
T Ð Terminal
INPUT
FIELD
SUPPLIED
INPUT DEVICE
mA INPUT | DEG. F RESET |
4 | 0.00 |
5 | 1.25 |
6 | 2.50 |
7 | 3.75 |
8 | 5.00 |
9 | 6.25 |
10 | 7.50 |
11 | 8.75 |
12 | 10.00 |
13 | 11.25 |
14 | 12.50 |
15 | 13.75 |
16 | 15.00 |
17 | 16.25 |
18 | 17.50 |
19 | 18.75 |
20 | 20.00 |
NOTE: The 4 to 20 mA input is a
Carrier EMS (Energy Management System) device.
Fig. 43 Ð Space Temperature Reset Wiring
42