York YK Style H Operation Manual page 37

FORM 160.76-O2
issue date: 6/15/2015
Head Pressure Setpoint
(15.0 to 60 PSID; default 23.0 PSID) Sets the pressure
differential to which the Control Valve will control
the Head Pressure. When both Hot Water Control and
Head Pressure Control are enabled, the Control Valve
will normally be performing Heat Recovery (control-
ling to the Hot Water Setpoint). However, it will switch
over to Head Pressure Control when certain operating
conditions are met as shown in the flow chart in the
Heat Recovery Section in OptiView Control Center –
Service Instructions (Form 160.76-M1). Only appears
when Head Pressure Control is enabled.
Remote Input Type
(0 to 10V or 4 to 20mA; default 0 to 10V) When op-
erating in Analog Control Source, the LTC I/O Board
accepts a Remote Hot Water Setpoint offset in the form
of either a 0 to 10VDC or 4 to 20mA input to the LTC
I/O Board input (TB9-3/4). This setpoint configures
the LTC I/O Board input to accept the input signal type
applied. Only appears when the Hot Water Control is
set enabled and the Control Source Setpoint (OPERA-
TIONS Screen) is set to Analog.
Control Valve Output Settings – Type
(0 to 10V or 4 to 20mA; default 0 to 10V) Sets the
output signal to the Control Valve to be in the form of
either 0 to 10VDC or 4 to 20mA. Only appears when
Hot Water Control is enabled or Head Pressure Control
is enabled.
Control Valve Output Settings – PID Output
(Direct or Reverse) Allows the output signal to the
Control Valve to be set to direct or reverse acting.
When set to direct, the voltage or current signal to the
Control Valve is at minimum for a 0% command and at
maximum for a 100% command. When set to reverse,
the voltage or current signal to the Control Valve is at
maximum for a 0% command and at minimum for a
100% command. Only appears when Hot Water Con-
trol is enabled or Head Pressure Control is enabled.
Control Valve Output Settings – Set
(0.0% to 100%; default 0.0%) Allows the Control Valve
to be manually set to a pre-determined position between
0.0% and 100%. Only appears when Hot Water Control
is enabled or Head Pressure Control is enabled.
JOHNSON CONTROLS
SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Control Valve Output Settings – Auto
Places the Control Valve in automatic control. Only ap-
pears when Hot Water Control is enabled or Head Pres-
sure Control is enabled.
Change Setpoints
Use to enter the Hot Water Control and Head Pressure
Control PID variables below. Pressing this key places a
green box around the first changeable setpoint. Use the
up/down, left/right arrows to place the selection box
around the desired setpoint. With the setpoint selected,
press the ENTER () key. A dialog box appears with
the range of settings. Using the NUMERIC keys, enter
desired value. Then, press the ENTER () key.
Hot Water Control – P
Sets the Proportional Gain of the Hot Water Control (0.00
to 5.00; default 2.00). Use the CHANGE SETPOINTS
key as described above to select/enter this setpoint. Only
appears when Hot Water Control is enabled.
Hot Water Control – I
Sets the Integral Gain of the Hot Water Control (0.00
to 5.00; default 2.00). Use the CHANGE SETPOINTS
key as described above to select/enter this setpoint.
Only appears when Hot Water Control is enabled.
Hot Water Control – D
Sets the Derivative Gain of the Hot Water Control (0.00
to 5.00; default 0.00). Use the CHANGE SETPOINTS
key as described above to select/enter this setpoint.
Only appears when Hot Water Control is enabled.
Head Pressure Control – P
Sets the Proportional Gain of the Head Pressure Con-
trol (0.00 to 5.00; default 2.00). Use the CHANGE
SETPOINTS key as described above to select/enter
this setpoint. Only appears when Head Pressure Con-
trol is enabled.
Head Pressure Control – I
Sets the Integral Gain of the Head Pressure Con-
trol (0.00 to 5.00; default 2.00). Use the CHANGE
SETPOINTS key as described above to select/enter
this setpoint. Only appears when Head Pressure Con-
trol is enabled.
Head Pressure Control – D
Sets the Derivative Gain of the Head Pressure Con-
trol (0.00 to 5.00; default 0.00). Use the CHANGE
SETPOINTS key as described above to select/enter
this setpoint. Only appears when Head Pressure Con-
trol is enabled.
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