TLR-D5P-U Engineering Manual
Doc: 70-07-0100, V2.2, Date: 20090201
©2008 Vector Controls
Page 11
Control Functions
The controller is designed to control package units with up to two heating or cooling stages and one support fan. The
unit may be controlled to run in fan only mode or automatic. In automatic mode, the controller will change heating or
cooling stages according to the temperature difference of room temperature and setpoint. The fan will run while there
is a stage active. Selecting mold protection will let the fan run continuously while the operation mode is ON or
ECONOMY. See below for control logic of 2- or 4-pipe systems.
Control parameters:
•
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
.
•
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.
•
Switching offset
for cooling and heating determines the temperature difference required for the second
stage to activate.
•
Switching Hysteresis
defines when a fan speed change is reversed. The aim is to avoid unnecessary
switching of fan speeds and thus to increase the life span of fan and relays.
•
Mold Protection.
The fan will not stop when the setpoint is reached while this parameter is activated. This
way the room will still be ventilated although there is no need to vary the temperature. The valve will still be
controlled according to temperature need. Mold protection should not be used for fan-only systems!
•
Reversing Valve:
Enable the reversing valve where the compressor is used for heating and cooling. The
reversing valve will activate either in heating or cooling mode depending on CP19. Due to physical limitations
of the controller, only one stage may be active if reversing valve is enabled. See Control Logic for further
information.
Legend:
T Input
Signal
O
QH
Offset
Heating
O
QC
Offset
Cooling
X
DZ
Dead
zone
X
SBY
Economy set point shift
W
H
Set point Heating
W
C
Set point Cooling
Q
C
,
Binary Output Stage Cooling
Q
H
Binary Output Stage Heating
Control Logic TLR-D5P
System type
CP19
DO1
DO2
DO3
DO4
DO5
Heating with reversing valve
1 or 2
FAN
Stage 1
Stage 2
Rev. Valve if CP19 = 1
Frost
Cooling with reversing valve
1 or 2
FAN
Stage 1
Stage 2
Rev. Valve if CP19 = 2
Frost
2 pipe system heat or cool
0
FAN
Stage 1
Stage 2
Frost
4 pipe system Heating
0
FAN
Stage 1
Stage 2
4 pipe system Cooling
0
FAN
Stage 1
Stage 2
ON
OFF
T
°C, F]
Q
C2
O
SH
W
H
O
SC
X
DZ
W
C
X
H
Q
C1
Q
H2
Q
H1