Heat/Cool System - York eco2 050 Installation Operation & Maintenance

Space Temp Alrm Diff
This parameter, and the Space Temperature Alarm
Time parameter below are used to generate a fault in
case the space temperature deviates from the current
space temperature setpoint by more than the Space
Temperature Alarm Differential and continues mov-
ing away from this setpoint for longer than the time
entered for the Space Temperature Alarm Time pa-
ram e ter. These two parameters are used together and
should be speciÞ ed (enabled) together.
This space temperature monitoring process is used
only in CV units and when:
• The space temperature is monitored by a Space
Sensor or a Network Communicated Sensor,
and
• The value of Space Temperature Alarm Dif fer -
en tial parameter is greater than zero, and
• The value of the Space Temperature Alarm Time
is greater than zero.
When the Differential parameter value is greater than
zero, the control will:
• Trend the space temperature anytime the space
temperature is above the setpoint by the fault
tem per a ture differential or greater. The control
must have been operating in a cooling mode for
at least 10 minutes be fore trending begins.
• Determine if the offset is increasing.
• Declare a fault if the differential tem per a ture con-
tin u ous ly increases for the Space Tem per a ture
Alarm Time.
Space Temp Alarm Time
When this option has a value other than zero pro-
grammed, it will load a timer with this value as soon
as the Space Temperature Alarm Differential func-
tion starts trending. Each time the trend is positive
(Space temperature is moving toward the Setpoint),
the timer is set to zero.
Low Ambient Operate
When this parameter is ON the control will apply Low
Ambient Operation when the outside air temperature
meets the speciÞ ed conditions. If this setting is set to
OFF, Low Ambient Operation will not be used.
YORK INTERNATIONAL
If low ambient operation is not enabled, mechanical
re frig er a tion will be inhibited at ambient temperatures
below the Cooling Lockout OAT.
SensConsist Enable
The "SensConsist Enable" parameter when set to ON
will permit operation of Sensor Consistency Tests 1
& 2.

HEAT/COOL SYSTEM

SAT Control For Cool
When enabled, this tells the control it is to do exces-
sive SAT monitoring and tripping for cooling. This
should be set to OFF at all times.
SAT Control For Heat
When enabled, this setting tells the control it is to
do excessive SAT monitoring and tripping for heat-
ing. This function is used on Constant volume units
only.
Rev Act Heat Valve
When this option is set to ON, the control outputs
10VDC when the valve is closed and 0VDC when the
valve is open. The valve operation is opposite of the
Direct Actuated valve and is intended for Normally
Open ("fail-safe") valves.
Cooling Mode Enable
When the Cooling Mode Enable parameter is ON,
the unit is to use CV or VAV Cooling Operation to
control temperature. When this parameter is OFF, no
me chan i cal cooling will be used.
Heating Mode Enable
When the Heating Mode Enable parameter is ON,
the unit is to use CV or VAV Heating Operation to
control temperature. When this parameter is OFF, no
heating will be used.
Heating Lockout OAT
This is the Outside Air Temperature Setpoint that the
control will use to lock out Heating when the OAT is
above this setpoint. A one-degree hysteresis is used
on each side of the setpoint.
FORM 100.50-NOM1 (604)
103
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