Timeouts And Delays; Constant Volume Sequence Of Operation; Table 14 - Timeouts And Delays - York eco2 050 Installation Operation & Maintenance

TIMEOUTS AND DELAYS

Table 14 lists the timeouts and delays that are to apply
in all functions unless an exception for a speciÞ c func-
tion is speciÞ ed.
TABLE 14 – TIMEOUTS AND DELAYS
Number Timeout or Delay
1 *ASCD for cooling
2 *ASCD for "Cooling SAT Alarm"
3 *ASCD for "Heating SAT Alarm"
4 *ASCD for heating
5 Energy Saver Delay
6 Minimum Run Time for Cooling
7 Supply Fan *ASCD
8 Exhaust Fan Minimum Run Time
9 Exhaust Fan Minimum Off Time
10 Delay to allow SAT to stabilize
*ASCD - Anti Short Cycle Delay

CONSTANT VOLUME SEQUENCE OF OPERATION

Under Constant Volume (CV) operation, the unit will
be controlled from one of the following sources in order
of priority:
• 7-Wire Thermostat.
• Space Sensor.
The Primary Unit Controller will monitor each source
and self-con Þ g ure to the source available with the high-
est priority.
Thermostat Control In CV Operation
Under thermostat control, the unit will monitor the G,
Y1, Y2, W1, and W2 thermostat inputs and control the
unit accordingly. Cooling Operation with Y1 and Y2
thermostat inputs are as follows:
YORK INTERNATIONAL
This "minimum OFF time" delay will not allow any compressor to turn on,
unless it has been off for 5 minutes, except when ASCD override is ON.
This will not allow any compressor to turn ON after an excessive SAT trip has
occurred, until it has been off for 3 minutes.
This will not allow any heat stage to turn ON after an excessive SAT trip has
occurred, until it has been off for 5 minutes.
This "minimum OFF time" delay will not allow any heating stage to turn on,
unless it has been off for 2 minutes. Exception: Supply Air Tempering = 1 min.
This is a 1 minute minimum time between turning on
compressor stages or heating steps.
A minimum run time of 5 minutes will apply to all compressors.
This will not allow the Supply Fan to turn ON unless it has been OFF for 30
seconds.
The exhaust fan will have a minimum ON time of 10 seconds.
The exhaust fan will have a minimum OFF time of 1 minute.
A 5 minute delay will be used any time a compressor, or a heating stage is
turned ON, or OFF, before using the SAT reading for any control decisions.
Compressor Staging - ON:
• Y1 Only – Cooling Stage 1 – Both system 1
compressors and one of the System 2 or System 3
compressors on a six compressor unit.
• Y1 and Y2 – Cooling Stage 2 – All of the installed
compressor on System 1, 2 and 3 if applicable.
• If Y2 is present without Y1, the unit will stage on
Y1 per above and then stage on Y2.
Compressor Staging – OFF:
• Y2 Off – Shut off Cooling Stage 2 - It will shut
off one-half of the installed compressor. On a four
compressor system it will shut off the System 2
compressors. On a six compressor system it will
shut off three of the four System 2 and System 3
compressors.
FORM 100.50-NOM1 (604)
Description
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