Section 5 - Sequence Of Operation; Unit Type; Occupied / Unoccupied Mode; Constant Volume Mode (Cv) - York ECO2 YPAL 050 Installation & Operation Manual

SECTION 5 – SEQUENCE OF OPERATION

UNIT TYPE

The Simplicity Control is capable of being confi gured
for either Constant Volume (CV) or Variable Air
Volume (VAV) operation. To confi gure the unit for
VAV operation a 10,000 to 20,000 ohm resister must be
installed on the P7 (CV/VAV) connector on the control
board. If no resister is installed the unit is confi gured
for CV operation. The control board should already be
confi gured from the factory based on the type of unit
that was ordered. However, this item should be verifi ed
at the time of start up. This feature will also need to be
confi gured if a replacement control board is installed.

OCCUPIED / UNOCCUPIED MODE

The unit can be placed in the occupied or unoccupied
mode by four different methods.
•
Digital Input - A switch, external time clock, etc.
can be used to close a 24 volt AC circuit between
the "R" and "OCC" connection on the fi eld con-
nection terminal block of the Simplicity control
board. When the circuit is closed, the unit is in
the Occupied mode. If the circuit is open, the
unit is in the unoccupied mode. In order to use
this feature "OCCUPIED INPUT ENABLED"
must be enabled using Parameter 71 under the
PROGRAM key on the Simplicity control board
or under the SYSTEMS OPTIONS tab in the
Simplicity PC software package.
•
Internal Schedule – The Simplicity Control can
be programmed for a weekly schedule that al-
lows two occupied and two unoccupied times
for each day. The control can also be confi gured
for up to 20 Holiday schedules. The start date,
time, and number of days can be programmed in
for each holiday. The weekly schedule can be
programmed using the WEEKLY SCHEDULE
SETTINGS tab in the Simplicity PC software
package. The holiday schedule can be pro-
grammed using the HOLIDAY SCHEDULE
tab in the Simplicity PC software package. In
order to use this feature "OCCUPIED INPUT
ENABLED" must be disabled using Parameter
71 under the PROGRAM key on the Simplicity
control board or under the SYSTEMS OPTIONS
tab in the Simplicity PC software package.
JOHNSON CONTROLS
•
An "Occupancy Command" can be entered into
the Simplicity Control using the Modbus com-
munication feature. In order to use this feature
"OCCUPIED INPUT ENABLED" must be en-
abled using Parameter 71 under the PROGRAM
key on the Simplicity control board or under the
SYSTEMS OPTIONS tab in the Simplicity PC
software package.
•
Space Sensor with Unoccupied Override Button
– If the Override Button is pushed on the space
sensor the control will switch to the Occupied
mode until the Unoccupied Override Time has
expired. The Unoccupied Override Time can be
set between 0 and 240 minutes. The "UNOCCU-
PIED OVERRIDE TIME" can be programmed
by selecting Parameter 9 using the Simplicity
control board PROGRAM key or by using the
SYSTEMS OPTION tab in the Simplicity PC
software package.

CONSTANT VOLUME MODE (CV)

A Constant Volume (CV) unit can be controlled by four
methods:
•
Stage thermostat
•
Communicated Space Temperature
•
Hardwired Space Temperature
•
Stand Alone
The control is self-confi guring based on the inputs that
are present. The controls means are listed in their order
of priority. If the Simplicity Control sees a thermostat
input it will respond to that input regardless of the status
of the Space Temperature input. This feature allows
the Service Technician to easily energize a cooling or
heating function for troubleshooting regardless of a
space temperature input.
As long as the Simplicity Control is receiving a space
temperature input from the BAS system, it will use
the communicated value instead of a hard wired space
temperature input.
The following parameters must be programmed to allow
cooling and/or heating operation:
FORM 100.50-NOM6 (1207)
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