York YK Style H Operation Manual page 36

SECTION 2 - OPTIVIEW CONTROL CENTER INTRODUCTION
Leaving Heating Condenser Liquid
Temperature
Displays the temperature of the liquid as it leaves the
heating condenser tube bundle.
Active Hot Water Setpoint
Displays the Hot Water Setpoint to which the Leaving
Heating Condenser Liquid Temperature is being con-
trolled. Only appears when Hot Water Control is enabled.
Entering Condenser Liquid Temperature
Displays the temperature of the liquid as it enters the
standard condenser tube bundle.
Leaving Condenser Liquid Temperature
Displays the temperature of the liquid as it leaves the
standard condenser tube bundle.
Head Pressure
Displays the pressure difference between the condens-
er and evaporator (condenser minus evaporator). This
is also called the Head Pressure. Only appears when
Head Pressure Control is enabled.
Head Pressure Setpoint
Displays the active Head Pressure Setpoint to which
the head pressure is being controlled. Only appears
when Head Pressure Control is enabled.
Heating Condenser Liquid Flow Switch (LED)
Displays the status of the flow switch in the heating
condenser tube bundle. Illuminates when liquid flow is
present. Otherwise, it is extinguished.
Condenser Liquid Flow Switch (LED)
Displays the status of the flow switch in the standard
condenser tube bundle. Illuminates when liquid flow is
present. Otherwise, it is extinguished.
PID Control Mode
Only appears when Hot Water Control is enabled. Dis-
plays the function the Control Valve is controlling. If
the chiller is equipped with both Heat Recovery and
Head Pressure Control and both are enabled, there is
not a control valve for each feature. Rather, there is
one common valve that is either performing Hot Wa-
ter Control for Heat Recovery or it is performing Head
Pressure Control. It will not be performing control for
both features at the same time. Normally, it will be
performing Hot Water Control unless certain operat-
36
ing conditions cause it to switch over to Head Pressure
Control. When performing Hot Water Control, Hot
Water is displayed. When performing Head Pressure
Control, Head Pressure is displayed. There are also
conditions under which it is not controlling either one,
in which case Inactive is displayed. Which feature will
be controlling the valve at any given time and when
it is inactive is determined by operating conditions
as shown in the flow chart in the Heat Recovery Sec-
tion in OptiView Control Center – Service Instructions
(Form 160.76-M1).
Control Valve Output
Displays the position command being sent to the con-
trol valve. If Hot Water Control is enabled and there is
flow in the Heating Condenser, the valve is perform-
ing Heat Recovery Control. Otherwise, if Head Pres-
sure Control is enabled, it is performing Head Pressure
Control. Displayed over the range of 0.0% to 100%.
The actual value of the output signal for a given error
depends on whether the PID Output Setpoint is set to
direct or reverse. If set to direct, the 0.0% output will
be at minimum; the 100% output will be at maximum.
If set to reverse, the 0.0% output will be at maximum;
the 100% output will be at minimum. Only appears
when Hot Water Control is enabled or Head Pressure
Control is enabled.
Control Valve Control Mode
Displays whether the Control Valve is in automatic or
manual control. Only appears when Hot Water Control
is enabled or Head Pressure Control is enabled.
PROGRAMMABLE
Hot Water Control
(Enabled or Disabled; default Disabled) Allows the
Service Technician to enable and disable the Hot Water
Control for the Heat Recovery feature. When enabled,
Control Valve will control the Return Condenser Liq-
uid Temperature to achieve the Hot Water Setpoint.
Hot Water Setpoint
(65.0 to 125°F extended range, 65.0 to 112°F standard
range; default 95°F) Sets the temperature to which the
Control Valve will control the Leaving Heating Con-
denser Liquid Temperature. Only appears when Hot
Water Control is enabled.
FORM 160.76-O2
issue date: 6/15/2015
JOHNsON CONtROLs