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11
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, momentarily short and
release Forced Defrost pins.
S
Five minute compressor re--cycle 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
_
F.
S
On 24ANA7 models there is a 1 minute time delay
between staging from low to high and from high to low
capacity. On 24ANA1 models there is no delay; the
compressor will change from low to high and from high
to low capacity on the fly to meet the demand.
LOW AMBIENT COOLING
If this unit will be required to operate below 55
_
F outdoor
temperature, provisions must be made for low ambient operation.
Infinity Controlled low ambient cooling:
This unit is capable of low ambient cooling down to 0
_
F without
a kit ONLY when using Infinity control. A low ambient kit is not
required, and the outdoor fan motor does not need to be replaced
for Infinity controlled low ambient operation. The Infinity
Control provides an automatic evaporator coil freeze protection
algorithm that eliminates the need for an evaporator freeze
thermostat. Low ambient cooling must be enabled in the User
Interface set up. Fan may not begin to cycle until about 40
_
F
OAT. Fan will cycle based on coil and outdoor air temperature.
Infinity controlled low ambient mode operates as follows:
S
Fan is OFF when outdoor coil temp is < (outdoor air
tempe 3
_
F) or outdoor fan has been ON for 30
minutes. (Fan is turned off to allow refrigerant system to
stabilize.)
S
Fan is ON when outdoor coil temp > (outdoor air
tempe 25
_
F) or outdoor coil temp > 80
_
F or if
outdoor fan has been OFF for 30 minutes. (Fan is turned
on to allow refrigerant system to stabilize.)
S
Low pressure switch is ignored for first 3 minutes during
low ambient start up. After 3 minutes, if LPS trips, then
outdoor fan motor is turned off for 10 minutes, with the
compressor running. If LPS closes within 10 minutes
then cooling continues with the outdoor fan cycling per
the coil temperature routine listed above for the remainder
of the cooling cycle. If the LPS does not close within 10
minutes, then the normal LPS trip response (shut down
cooling operation and generate LPS trip error) will occur.
UTILITY RELAY
*
UTILITY SIGNAL
OPEN RELAY
*
SUPPLIED BY UTILITY PROVIDER
LLS
Liquid Line Solenoid
A05247
Fig. 10
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2--Stage Control Board
24AN
A