York ECO2 YPAL 050 - Manual (Page 84)

84 JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Sequence of Operation
•
The Simplicity Control then starts a 3 minute
timer.
•
If after 3 minutes the supply air temperature is
equal to or less than the “SUPPLY AIR TEMP
LIMIT HEATING SETPOINT” minus 10.1° F the
Simplicity Control will turn the heat stage back
on provided there is still a demand for the staged
off heat stage.
•
If after 3 minutes the supply air temperature is
not equal to or less than the “SUPPLY AIR TEMP
LIMIT HEATING SETPOINT” minus 10.1° F the
Simplicity Control will keep the heat section off
until the supply air temperature is equal to or less
than the “SUPPLY AIR TEMP LIMIT HEATING
SETPOINT” minus 10.1° F. The Simplicity Con-
trol will turn the heat stage back on provided there
is still a demand for the staged off heat stage.
If multiple heat stages are on the control will monitor
the supply air temperature and respond as follows:
•
The Simplicity Control will monitor the supply
air temperature and compare it to the “SUPPLY
AIR TEMP LIMIT HEATING SETPOINT”. If the
supply air temperature is 0.1° F or more above
this value and the heat stage minimum run time
requirement has been met the Simplicity Control
will turn off the heat section with the shortest run
time.
•
The Simplicity Control starts a 3 minute and
30 second timing sequence. If after 30 seconds
the supply air temperature is still 0.1° F above
the “SUPPLY AIR TEMP LIMIT HEATING
SETPOINT”, the control will turn off the next
heat stage with the shortest run time.
•
The Simplicity Control will continue to turn off
heat stages every 30 seconds until the supply air
temperature is equal to or less than the “SUPPLY
AIR TEMP LIMIT HEATING SETPOINT”.
•
If after 10 minutes the supply air temperature is
equal to or less than the “SUPPLY AIR TEMP
LIMIT HEATING SETPOINT” minus 10.1° F
the Simplicity Control will turn the heat stage(s)
back on provided there is still a demand for the
use of the staged off heat stage.
•
If after 10 minutes the supply air temperature
is still greater than the “SUPPLY AIR TEMP
LIMIT HEATING SETPOINT” minus 10.1° F the
Simplicity Control will keep the heat stage(s) off
until the supply air temperature is equal to or less
than the “SUPPLY AIR TEMP LIMIT HEATING
SETPOINT” minus 10.1° F. The Simplicity Con-
trol will turn the heat stage(s) back on provided
there is still a demand for the staged off heat
stage.
SPACE SENSOR WITH SET POINT ADJUSTMENT
A space sensor with a 20 K ohm slide potentiometer
can be used to reset the Occupied Cooling and Heating
set points.
In addition to the use of a space sensor with the
slide potentiometer the following parameter must be
programmed:
“SPACE TEMPERATURE OFFSET RANGE” – The
offset range must be programmed using Parameter
56 under the PROGRAM key on the Simplicity Elite
control board or under the SYSTEMS OPTIONS tab
in the Simplicity Elite software package.
Sequence of Operation
As the slide potentiometer is moved the Occupied
Cooling and Heating set point is changed based on
the programmed “SPACE TEMPERATURE OFFSET
RANGE”. The “SPACE TEMPERATURE OFFSET
RANGE” can be set from 0 to 5.0° F. For example,
if the “SPACE TEMPERATURE OFFSET RANGE”
is programmed for 3.0° F and the resistance of the
potentiometer is lowered the Cooling and Heating set
points would be lowered up to 3.0° F. If the resistance
is increased the Cooling and Heating set points would
be increased up to 3.0° F.