Introduction
Radiant systems are gaining popularity due
to their ability to offer increased energy
efficiency and cost savings when compared
with traditional all-air systems. As more
experience is gained in designing radiant
systems, it is recognized that the control
systems and accessories associated with
these systems carry unique characteristics
and opportunities. For this reason, Price
controls for radiant systems have been
designed to be as versatile and modular
as possible, and accessories and options
have been chosen to compliment both the
controls and system.
Price Intelligent Controller for Radiant
Products (PIC-HP)
The PIC-HP is a standalone or networkable,
fully digital and programmable controller.
This control solution is ideal for managing
the sequences of Price radiant heating and
cooling products. The PIC-HP is an advanced
and configurable proportional integral
(PI) controller that allows for exceptional
user comfort and energy efficiency. It is
designed specifically to manage the control
requirements of radiant systems.
The PIC-HP is designed with a modular
architecture and includes BACnet
networking as standard. This gives the
customer flexibility by providing both the
“core” controller as well as powerful control
and communication options with the use of
the expansion modules.
Typical Application Overview
The PIC-HP can be factory configured to any
one of the eight standard control sequences,
as well as custom sequences, if required.
There are six standard sequences that
control water flow only, and two standard
sequences that control the water flow
and VAV air (variable air volume). The
standard control sequences are available
for either 2 pipe or 4 pipe operation and
indicate the control output used with the
associated actuator type (on/off or 0-10Vdc
modulating). Typical control sequences for
water and air include:
On/Off, 2 Pipe, Constant Air Volume
(Sequence #9701)
Chilled Water Supply Only
Upon an increase in room temperature
above the set-point, the air volume will
remain at its pre-selected level while the
cold radiant valve opens fully. When the
room temperature decreases to the setpoint,
the cold water actuator turns off the
flow.
On/Off, 2 Pipe, Constant Air Volume
(Sequence #9703)
Hot Water Supply Only
Upon a decrease in room temperature
below the room set-point, the air volume
will remain at its pre-selected level while the
hot radiant valve opens fully. When the room
temperature increases to the set-point, the
hot water actuator turns off the flow.
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Modulating, 2 Pipe, Constant Air Volume (Sequence #9700) Chilled Water Supply Only Upon an increase in room temperature above the room set-point, the air volume will remain at its pre-selected level while the cold radiant valve modulates from closed to open in proportion to the room temperature. Upon a decrease in room temperature, the cold radiant valve modulates closed.
Modulating, 2 Pipe, Constant Air
Volume (Sequence #9702)
Hot Water Supply Only
Upon a decrease in room temperature
below the room set-point, the air volume
will remain at its pre-selected level while the
hot radiant valve modulates from closed to
open in proportion to the room temperature.
Upon an increase in room temperature, the
hot radiant valve modulates closed.
On/Off, 4 Pipe, Constant Air Volume
(Sequence #9705)
Chilled Water Supply
Upon an increase in room temperature
above room the set-point, the air volume will
remain at its pre-selected level while the cold
radiant valve opens fully. When the room
temperature decreases to the set-point, the
cold water actuator turns off the flow. The
hot water valve remains fully closed.
Dead Band
With no demand in the space (ie. when the
temperature is at or close to the set-point),
the water valves (hot and cold) remain
closed and the air volume remains constant.
Hot Water Supply
Upon a decrease in room temperature
below the room set-point, the air volume will
remain at its pre-selected level while the hot
radiant valve opens fully. When the room
temperature increases to the set-point, the
hot water actuator turns off the flow. The
cold water valve remains fully closed.
Modulating, 4 Pipe, Constant Air
Volume (Sequence #9704)
Chilled Water Supply
Upon an increase in room temperature
above the room set-point, the air volume
will remain at its pre-selected level while the
cold radiant valve modulates from closed to
open in proportion to the room temperature.
Upon a decrease in room temperature, the
cold radiant valve modulates closed. The
hot radiant valve is always fully closed.
Dead Band
With no demand in the space (ie. when the
temperature is at or close to the set-point),
the water valves (hot and cold) remain
closed and the air volume remains constant.
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