York ECO2 YPAL 050 - Manual (Page 64)

64 JOHNSON CONTROLS
FORM 100.50-NOM6 (1207)
Sequence of Operation
“COOLING MODE OPERATION ENABLED” – must
be enabled using Parameter 53 under the PROGRAM
key on the Simplicity control board or under the
COOLING SETUP tab in the Simplicity PC software
package.
“HEATING MODE ENABLED FOR OPERATION”
– must be enabled using Parameter 54 under the
PROGRAM key on the Simplicity control board or
under the HEATING SETUP tab in the Simplicity PC
software package.
Thermostat Input
The Simplicity Control is set up to receive the following
cooling/heating inputs from the thermostat:
The following System parameters must be programmed
through the simplicity control:
“CV OCCUPIED COOLING SETPOINT” - This
parameter must be programmed to 99.0º F. This can be
programmed using parameter 10 under the PROGRAM
key on the Simplicity control board or under the
COOLING SETUP tab in the Simplicity PC software
package.
“CV OCCUPIED HEATING SETPOINT” - This
parameter must be programmed to 45.0º F. This can be
programmed using parameter 11 under the PROGRAM
key on the Simplicity control board or under the
HEATING SETUP tab in the Simplicity PC software
package.
“CV UNOCCUPIED COOLING SETPOINT” - This
parameter must be programmed to 99.0º F. This can be
programmed using parameter 12 under the PROGRAM
key on the Simplicity control board or under the
COOLING SETUP tab in the Simplicity PC software
package.
“CV UNOCCUPIED HEATING SETPOINT” - This
parameter must be programmed to 45.0º F. This can be
programmed using parameter 13 under the PROGRAM
key on the Simplicity control board or under the
HEATING SETUP tab in the Simplicity PC software
package.
The unit uses tandem compressors,
two compressors for System 1 and two
compressors for System 2.
Occupied Cooling
•
Y1 – First Stage of Cooling – 1st compressor
from System 1.
•
Y2 – Second Stage of Cooling – 2nd compressor
from System 1.
•
Y3 – Third Stage of Cooling – 1st compressor
from System 2.
•
Y4 – Fourth Stage of Cooling – 2nd compressor
from System 2.
Unoccupied Cooling
Unoccupied cooling operation is the same as Occupied.
A programmable thermostat would be required in order
to change the cooling temperature settings between
occupied and unoccupied.
If the Simplicity Control receives both a “Y” cooling
call and “W” heating call at the same time the control
will function and operate in the heating mode.
The YPAL 50 to 65-ton unit has four stages of
mechanical cooling available and it is recommended
that a four stage cooling thermostat be used. However,
a two stage cooling thermostat could be used by
connecting Y1 from the thermostat to Y1 and Y2 on
the Simplicity fi eld connection terminal block and Y2
from the thermostat to Y3 and Y4 on the Simplicity fi eld
connection terminal block.
In this mode of operation, the Simplicity will operate
as a two-stage control. On the 50 to 65 ton unit the
compressors will be grouped as follows:
•
First stage – Compressors 1A and 1B – System
1 compressors – minimum 30 second delay be-
tween compressors.
•
Second stage – Compressors 2A and 2B – Sys-
tem 2 compressors – minimum 30 second delay
between compressors.