TLC-BCR-T Engineering Manual
Doc: 70-00-0083, Date: 20081219
© 2008 Vector Controls Ltd.
Page 8
Control Functions
The controller is designed to control binary heating and/or cooling systems.
Setpoint
•
Minimum and Maximum Set Point Limits: Limits the adjustable range of the loop set point. The limits for
heating and cooling sequence may be chosen individually.
Control Sequence
•
4-pipe or 2-pipe system: 4-pipe systems use one heating and one cooling stage. Heating and cooling mode
will switch according to demand. A delay is implemented to prevent unnecessary switching between heating
and cooling mode: Heat – Cool change over delay. To disable the automatic switching set UP03 to OFF.
•
Economy set point shift X
SBY
: This function shifts the set point while the operation mode is Economy. The
heating set point W
H
is reduced and the cooling set point W
C
increased by the value of the Economy set point
shift X
SBY
.
•
Dead Zone Span X
DZ
: The dead zone span lies between the heating and the cooling set point. The user can
change the heating or cooling set points within adjustable limits.
•
Switching Hysteresis: Defines the difference between switching on and switching off of an output. A small
hysteresis will increase the number of switching cycles and thus the wear on associated equipment.
•
Switching Span: Defines the temperature difference required to switch on the next stage in case multiple
stages are active (2-pipe system only).
•
Delay OFF: Prevents a too short running cycle for the heating or cooling stage by setting a minimum running
time. Delay OFF applies to all heating and cooling stages.
•
Delay ON: Prevents a too short stopping cycle for heating or cooling stage by setting a minimum stopping
time. Delay ON applies to all heating and cooling stages.
•
Step by step switching: In order to reduce the startup load of large motors, multiple stages will be
switched on and off step by step.
•
Binary Control
T Room
Temperature
w
H
Setpoint Heating Mode
D
Z
Dead
Zone
Q
H
Offset
Heating
w
C
Setpoint Cooling Mode
X
SBY
Economy
Shift
Q
C
Offset
Cooling
H
F
Hysteresis
Output Configuration
Two options are available: 3-point or binary.
3-point output
If 3-point is selected a 3-point actuator may be driven. The actuator has an open input and a close input. Applying
power to the Open input will drive the valve or damper open, applying power to the close input will drive the valve or
damper to the closed position.
The running time of the actuator may be preset. We recommend to enter the maximum running time under maximum
load in order to make sure that the valve can fully close and fully open in any circumstance.
In order to open the valve or damper DO1 will be activated for the preset amount of time. After the expiration of the
running time DO1 and DO2 will be OFF. The valve is closed by activating DO2 for the preset amount of time.
Binary output
Two devices may be controlled in case the 3-point actuator setting is OFF. The following is true if reversing valve is
disabled: If 2-pipe system is selected DO1 will activate stage 1 for heating and cooling and DO2 activates stage 2. For
a 4-pipe system DO1 will control heating and DO2 the cooling device.
Reversing Valve
In binary output mode a reversing valve option is available. Select 1 if the reversing valve is to be activated while in
heating mode, select 2 if the reversing valve is active while the unit is in cooling mode.
Control Logic TLC-BCR
System type
BC11
BC15
DO1
DO2
2 pipe system heat or cool
OFF
0
Stage 1
Stage 2
4 pipe system Heating mode ON 0
Stage
1
(Heat)
4-pipe system Cooling mode ON 0
Stage
1
(Cool)
4-pipe reversing valve on Heat
ON
1
Stage 1
Rev valve (in heat mode)
4-pipe reversing valve on Cool
ON
2
Rev valve (in cool mode)
Stage 1
ON
OFF
T [°C, F]
Q
C2,
Q
D2
X
SBY
W
H
X
SBY
X
DZ
W
C
X
H
Q
C1,
Q
D1
Q
H2,
Q
R2
