JOHNSON CONTROLS
68
FORM 100.50-NOM6
ISSUE DATE: 8/07/2017
SECTION 5 – SEQUENCE OF OPERATION
•
“HEATING MODE ENABLED FOR OPERA-
TION”
– must be enabled using Parameter 54 un-
der 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 follow-
ing 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 99.0
°
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 Sim-
plicity PC software package.
•
“CV OCCUPIED HEATING SETPOINT”
- This
parameter must be programmed to 45.0
°
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 Sim-
plicity PC software package.
•
“CV UNOCCUPIED COOLING SETPOINT”
-
This parameter must be programmed to 99.0° F.
This can be programmed using parameter 12 un-
der 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 45.0° F.
This can be programmed using parameter 13 un-
der 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 com-
pressors for System 2.
Occupied Cooling
Compressor stages will be energized based on input
from the thermostat as follows:
•
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 oc-
cupied 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 61 ton unit has four stages of me-
chanical 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
field connection terminal block and Y2 from the ther-
mostat to Y3 and Y4 on the Simplicity field connection
terminal block.
In this mode of operation, the Simplicity will operate
as a two-stage control. On the 50 to 61 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 – System
2 compressors – minimum 30 second delay be-
tween compressors.
Occupied Heating
There are three stages of heating available:
1. W1 – First Stage of Heating
2. W2 – Second Stage of Heating
3. W3 – Third Stage of Heating
See the Heating section of this manual for a description
of the heating staging.
Unoccupied Heating
Unoccupied heating operation is the same as Occupied.
A programmable thermostat would be required in order
to change the heating temperature settings between oc-
cupied and unoccupied.
