32
APPENDIX B — SEQUENCE OF OPERATION EXAMPLES (CONT)
Table C — Fixed Dry-Bulb with DCV (CO
2
Sensor) — 2-Speed Fan In Conventional Mode
THERMOSTAT ECONOMIZER
CONTROL MODE OCCUPIED
OA GOOD TO
ECONOMIZE?
CO
2
Y1I Y2I Y1O Y2O
DAMPER
POSITION
EF (1 or 2)
a
a. Exhaust Fan — one or two exhaust fans can be connected to the economizer controller.
CONVENTIONAL
Cooling
No N/A N/A Off Off Off Off Closed Off
Yes N/A
>SP
b
b. Setpoint — Demand controlled ventilation setpoint.
Off Off Off Off
VENT MIN L to
VENT MAX L
On/Off
c
c. The controller energizes Exhaust Fan Relay 1 and Exhaust Fan Relay 2 if the damper position reaches Exhaust Fan 1 parameter setting and Exhaust Fan Relay 2
parameter setting respectively.
SP Off Off Off Off VENT MIN L Off
No Yes N/A
On Off Off Off
Closed to Fully
Open (100%)
On
On On On
On/Off
d
d. If Y2I is ON for less than a set time (15 minutes by default), then Relay 2 is OFF. If Y2I is ON for more than a set time and the OAT is greater than MAT setpoint (3MAT
SET), then Relay 2 energizes to allow Y2 pass-through to enable Cooling Stage 2.
Fully open
(100%)
On
Yes Yes
>SP On Off Off Off
VENT MIN L to
100%
On
>SP On On On On/Off
d
VENT MIN H to
100%
On
SP On Off Off Off
VENT MIN L or
100%
On
SP On On On On/Off
d
VENT MIN H or
100%
On
No No N/A
On Off On Off
Closed Off
On On On On
Yes No
>SP On Off On Off
VENT MIN L to
VENT MAX L
On/Off
c
>SP On On On On
VENT MIN H to
VENT MAX H
On/Off
c
SP On Off On Off VENT MIN L Off
SP On On On On VENT MIN H Off
Heating
No N/A N/A Off Off Off Off Closed Off
Yes N/A
SP Off Off Off Off VENT MIN H Off
>SP Off Off Off Off
VENT MIN H to
VENT MAX H
On/Off
c
HEAT PUMP Cooling
Yes N/A
>SP Off Off Off Off
VENT MIN L to
VENT MAX L
On/Off
c
SP Off Off Off Off VENT MIN L Off
Yes Yes
>SP On Off Off Off
VENT MIN L to
100%
On
>SP On On On On/Off
d
Fully open
(100%)
On
SP On Off Off Off
VENT MIN L to
100%
On
SP On On On On/Off
d
Fully open
(100%)
On
Yes No
>SP On Off On Off
VENT MIN L to
VENT MAX L
On/Off
c
>SP On On On On
VENT MIN H to
VENT MAX H
On/Off
c
To Next Page
Loading...
