York MILLENNIUM Y22, Installation Manual

Page: 110 / 140

102777-YIM-E-0206
110 Unitary Products Group
Supply AirTemp (SAT) Alarm Setpoint for Cooling - (0 ° F) -
If the SAT does not drive below this setpoint when all stages
of compression are operating and 10 minutes has elapsed
since the last compressor was energized, the control will
declare a Cooling SAT Failure Alarm.
The alarm is written to the Error History Buffer. In networked
applications, the alarm flag is readable by the network.
The alarm will reset automatically if the SAT does decrease
below the setpoint (the alarm condition no longer exists), or
when a compressor is turned off (the control does not request
all compressors operate). The SAT Alarm Setpoint for Cool-
ing can be adjusted from 50°F - 80°F. If the value is set to 0°F
(default) this feature is disabled.
Before the control declares an error, it will read the OAT and
the Economizer position. If the OAT is more than 20°F
warmer than the setpoint and the Economizer is open more
than 20%, the control will close the Economizer for 10 min-
utes and then read the SAT. If the SAT falls below the set-
point, the control will declare an Economizer Minimum
Position alarm. The control will keep the Economizer closed
and finish the Cooling mode. After the Cooling mode has
been satisfied, the control will move the Economizer back to
the minimum position.
Supply Air Temp (SAT) Alarm Setpoint for Heating - (0 ° F) -
The SAT must drive above this setpoint when all stages of
heating are operating and 10 minutes has elapsed since the
last stage was energized. If this does not happen, the control
will declare a Heating SAT Failure Alarm. The alarm is written
to the Error History Buffer. In networked applications, the alarm
flag is readable by the network. The alarm will reset automati-
cally if the SAT does increase above the setpoint (the alarm
condition no longer exists), or when a heating stage is turned
off (the control does not request all heat stages to operate).
The SAT Alarm Setpoint for Cooling can be adjusted from
70°F - 120°F. If the value is set to 0°F (default) this feature is
disabled.
Before the control declares an error, it will read the OAT and
the Economizer position. If the OAT is more than 20°F colder
than the setpoint and the Economizer is open more than
20%, the control will close the Economizer for 10 minutes and
then read the SAT. If the SAT rises above the setpoint, the
control will declare an Economizer Minimum Position alarm.
The control will keep the Economizer closed and finish the
Heating mode. After the Heating mode has been satisfied,
the control will move the Economizer back to the minimum
position.
Unoccupied Override Time Period - (60 min) - The Unoc-
cupied Override Time Limit function will determine how long
the unit will operate in the Unoccupied Override mode when
the Override button is pressed on the Space Sensor.
Once the Unoccupied Override mode is initiated, it will con-
tinue until the programmed Unoccupied Override Time Limit
is reached. The Override mode can not be cancelled by, for
example, a change of state of the Occupied input to ON
(occupied) and then back to OFF (unoccupied).
This parameter is adjustable from 0 to 240 minutes. The
default is 60 minutes.
Fan Delays (ON) & (OFF) - Any time the control starts a
compressor it will load the Fan On Delay for Cool with the
programmed value. Any time the control turns off all the com-
pressors it will load the Fan Off Delay for Cool with the pro-
grammed value.
When the control turns on a gas heat stage, it will begin mon-
itoring the gas valve and load the Fan On Delay For Heat with
the programmed value when it senses gas valve voltage.
When the thermostat terminates the call for W1 the control
will turn off H1 output and load the Fan Off Delay for Heat
with the programmed value.
After the control has turned on heat, it will start monitoring the
Gas Valve. If at any time the Gas Valve (24 VAC) is not
present for five minutes while H1 is on, the control will flag an
Alarm. Anytime GV1/H1 goes off during the fan on delay, the
control will force the fan on, for the fan off delay period. The
control will wait for GV1 to be on at least 15 seconds before
forcing the fan on. If GV1 has been on for at least 15 sec-
onds, and then goes away before the Fan On Delay has fin-
ished, the fan will turn on anyway far a length of time equal to
the Fan Off Delay period.
If the control senses this input along with a Y signal, it will not
turn on the compressors and it will run the Heating mode.
Heating takes priority.
Fan ON Mode with the Sensor Option - (ON) - When this
option is turned ON, the supply fan will continue running
when the zone sensor based temperature control is satisfied.
This option applies only in systems using a zone sensor and
only in Occupied mode. With this option turned OFF, or in
Unoccupied mode, the fan will go off when the zone sensor
based temperature control is satisfied and will go on only
when there is a call for heating or cooling. Turning this option
ON is an equivalent of selecting fan ON (rather than AUTO)
in systems with a thermostat. In a thermostat system, the fan
control follows the thermostat's G signal. In sensor systems
and in the Occupied mode, the fan control follows the Fan
ON Mode option.
Space Sensor Enable - (OFF) (INTERNALLY SET) - The
control will use this input if it detects the device.
RAT Sensor Enable - (OFF) (INTERNALLY SET) - The con-
trol will use this input if it detects the device.