Carrier 25HPA Performance Series Installation Instructions Manual page 12

Time Delays
The unit time delays include:
S Five minute time delay to start cooling or heating
operation when there is a call from the thermostat or
user interface (To bypass this feature in a
non- -communicating system, momentarily short and
release forced defrost pins, in a communicating system
push the UI fan and up buttons simultaneously for
approximately 10 seconds)
S Five minute compressor recycle delay on return from a
brown out condition
S Two minute time delay to return to standby operation
from last valid communication (with Infinity only)
S One minute time delay of outdoor fan at termination of
cooling mode when outdoor ambient is greater than or
equal to 100 deg F
S Fifteen second delay at termination of defrost before
the auxiliary heat (W2) is de- -energized
S Twenty second delay at termination of defrost before
the outdoor fan is energized
S Thirty second compressor delay when Quiet Shift
enabled
COMM STATUS
Fig. 14 --- Control Board
12
A05332
Utility Interface
With Infinity Control
The input labeled UTIL is active only when a communicating
Infinity Control is used. This input allows a power utility device
to interrupt compressor operation during peak load periods. See
Fig. 15 for wiring connections. When the utility sends a signal to
sh u t t h e sy st em d o w n , t h e U ser In t erface w i l l d i sp l ay
"CURTAILMENT ACTIVE".
INFINITY BOARD
R
UTILITY RELAY
UTILITY SIGNAL
OPEN RELAY
*
SUPPLIED BY UTILITY PROVIDER
Fig. 15 --- Utility Interface
With Non- -Communicating Thermostats
W h e n t h e u t i l i t y c u r t a i l m e n t i n t e r f a c e i s u s e d w i t h a
non- -communicating thermostat, the utility relay should be wired
between R and Y.
} Outdoor Coil Temp
(OCT)
Outdoor Air Temp
}
(OAT)
UTIL
*
A05410