Honeywell MICRONIK 200 R7426A - Manual (Page 7)

R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL TIME CLOCK
7 EN1B-0203GE51 R0507C
Output Signal Mode YMode (C.11)
Sequence Operation
The controllers R7426B,C are supplied from the factory
configured for sequence operation of heating, mixed air, and
cooling control.
The sequence operation can be configured for the following
control applications by the control parameters YMode and
Y1CTRF (see Table 8). Sequence control will be activated if
at least one control parameter YxMode is not equal 4
(R7426B, only).
Table 8. Sequence Operation Selection
sequence control YMode Y1CTRF YxMode
for cooling with three outputs
(Y1, Y2, Y3)
1 0 0
for heating with three outputs
(Y1, Y2, Y3)
1 1 0
with two outputs (Y1, Y3) for
heating and one output for
cooling (Y2)
2 n.a. 0
with one output (Y2) for
heating and two outputs for
cooling (Y1, Y3)
3 n.a. 0
damper, cooling and heating
(Y1, Y2 and Y3)
0 0 0
energy recovery, cooling and
heating
0 1 0
Multistage ON/OFF Function
In the case of the three floating output controller R7426B,
several ON/OFF sequence control functions can be selected
by the configuration parameter YMode (see Table 9).
Table 9. Multistage Selection
output function YMode YxMode
provided
by
output
function
of Y2
6-stage ON/OFF
sequence control
1
4 (x=1, 2,
and 3)
Y1,Y2,Y3 n.a.
4-stage ON/OFF
sequence control
heating
2
4 (x=1
and 3)
Y1,Y3
4-stage ON/OFF
sequence control
cooling
3
4 (x=1
and 3)
Y1,Y3
15-stage binary
coded ON/OFF
sequence control
H.
5 n.a. Y1,Y3
according
to
Y2Mode
two-position
damper control
4 n.a. Y1
Y2 and
Y3
1)
1) individual (cooling and heating)
In the case of the R7426B,C controller, the output Y1 can be
configured for two-position damper control by setting the
configuration parameter YMode to 4.
Supply of Temperature Signal T2
T2ext (C.12)
If sensor T1 is used also for high or low limit control, the con-
figuration parameter T2ext must be set to 1. This inter-
connects the T1 and T2 input internally and the sensor has to
be connected only to the T1 input.
By using a limit temperate sensor T2, the parameter T2ext
has to be set to 0 (default).
Limit Type LimTyp (C.13)
The configuration parameter LimTyp allows the selection of
high or low limit control. High limit control is performed if
configuration parameter LimTyp = 1; low limit control is
performed if configuration parameter LimTyp = 0.
Sensor Type Senstyp (C.14)
Three different sensor types can be used with the controller
(see Table 10).
Table 10. Sensor Types
automatic ID
of sensor type
temperature
range
characteristics
Pt 1000 -30....+130 °C 1000Ω at 0°C
BALCO 500 -30....+130 °C 500Ω at 23.3°C
NTC 20k Ω
-30....+85 °C /
-30....+130 °C 1)
20k Ω at 25°C
1) NTC sensor is detected automatically if, during power-
up, the sensor temperature is within -30....+85
°C and the
configuration parameter Senstyp = 0. NTC sensor is
selected manually if the configuration parameter Senstyp
is set to 1.
Automatic identification of sensor type is selected if the
configuration parameter Senstyp = 0 (default). After power up
reset, the controller detects automatically the type of sensor
connected to the main temperature input T1. For correct auto
detection, it is necessary that the measured temperature be in
the specified range (see Table 10). The same type of sensor
must be used for all temperature inputs (T1, T2 and T3).
Output Control Function Y1CTRF (C.15)
The R7426A controller performs cooling control if the
configuration parameter Y1CTRF is set to 0. A rise in the
measured variable will increase the output value (direct
acting). The control action must be reversed for heating
control by setting the control parameter Y1CTRF to 1. A rise
in the measured variable will decrease the output value.
If the configuration parameter is set to 2, the R7426A
controller provides summer/winter changeover control by a
potential-free contact connected to the occupancy input
(terminals 1 and 4).
In the case of the R7426B,C controller, the configuration
parameter Y1CTRF has to be set to 0 (default) to perform
mixed air damper control and to 1 for energy recovery
systems.