Honeywell R7426C, R7426B SPECIFICATION DATA
R7426B,C
MicroniK 200
Fig. 1. Temperature controller
TEMPERATURE CONTROLLER
WITH REAL-TIME CLOCK
SPECIFICATION DATA
GENERAL
The R7426B,C temperature controllers cover all space and/or
discharge air temperature applications within the specified
control range of 0...50°C (LOw range) requiring sequence
operation of heating, mixed air damper or energy recovery
system and cooling with optional outside air temperature
compensation reset of the main setpoint. The controllers can
be configured to perform space or discharge air or spacedischarge air temperature cascade control with limit control.
For special higher temperature control applications, the
control range 0...130C (HI range) can be selected.
FEATURES
Weekly time schedule with up to six switching points
per day
Automatic daylight saving time change
Four different operating modes: Comfort, Standby,
Night, and OFF
Yearly holiday programming in advance
Three types of holiday schedules
Self-adaptive optimum start program for room control
system
Night cycle program
Fig. 2. LC Display
Order Numbers
Order-No. Controller Description
R7426B2012 Temperature controller with integrated
real time clock (RTC), Plant/System
ON/OFF output, and three 3-position
floating outputs. The controller offers the
choice of selectable different output
sequence operations and output signals
suitable to drive solid-state relays or step
relays.
R7426C2010 Temperature controller with integrated
real time clock (RTC), Plant/System
ON/OFF output, and three analog
outputs. The controller offers selection of
different output sequence operations.
EN0B-0301GE51 R0104
R7426B,C TEMPERATURE CONTROLLER
TECHNICAL DATA
General
Electronic 8-bit microcontroller, 10-bit A/D converter, EEPROM, and LC
display
Power supply 24 Vac +10...-15%, 50/60 Hz
Power consumption 3 VA + Actuator power requirements
Control range 0...50°C
Temperature
Inputs
Sensor type
1)
CPA/SPA-Input
Battery
T1 Main temperature sensor
T2 Cascade temperature sensor
T3 Compensation temperature sensor
Automatic identification of sensor type Temperature range Characteristics
Pt 1000
BALCO 500
NTC 20kτ -30....+85C / -30....+130C
1)
CPATYP 0
CPATYP 1 (953...1053 τ) CPA: 5 K
CPATYP 2 (0...100 kτ) CPA: 5 K
Type CR2032 (life time 8 years)
accuracy 0.5 K
excluding
sensor
2)
-30....+130C 1000 τ at 0C
-30....+130C 500 τ at 23.3C
1)
20 kτ at 25C
CPA/SPA range Sensor & CPA/SPA types
CPA: 5 K
internal
T7412B1016 (Pt 1000)
T7412B1057 (Pt 1000)
T7412C1030 (Pt 1000)
T7412B1008 (NTC 20kτ)
T7412C1006 (NTC 20kτ)
CPATYP 3 (10...20 kτ) SPA: 15...30C
T7412B1024 (BALCO 500)
T7412B1040 (Pt 1000)
CPATYP 4 (0...10 kτ) CPA: 5 K
HCW 23 (setpoint wheel
printed with +/- 5 K)
CPATYP 5 (0...100 kτ) SPA: 15...30C
CPATYP 6 (0...100 kτ) SPA: 0...50C or 0...130C
Analog input Humidity deviation (X
) -5...+5 Vdc, 200 mV / %rh
wrh
43193982-001
43193982-001
Digital inputs Mode Potential free contact
Occupancy unoccupied
occupied
Freeze protection input freeze protection operation
normal operation
open > 40 kτ
closed < 100 τ
open > 40 kτ
closed < 100 τ
Outputs ON/OFF output OFF / ON
TRIAC outputs
Floating
2, 3, 4, 6 or 15-stage
ON (24 Vac) / OFF (0 Vac)
Pulse-width modulation
1)
1)
max. load
450 mA at
24 Vac per
1)
0...100%
output
based on run time
Analog outputs on controller R7426C Control range
full range 0...12 Vdc
1)
0/2...10 Vdc (0...100%)
max. load
1.2 mA at
12 Vdc
Ambient limits
Operating temperature
Transport and storage temperature
0...50°C (0...122F
)
-35...+70°C (-31...+158F
)
Relative humidity 5...95%rh non-condensing
Safety
Protection class II as per EN60730-1
Protection standard IP30 or IP40 (front panel mounting) as per EN60529
Housing
Dimensions (H x W x D) 105 x 152 x 37 mm
Weight 250 g
Mounting Front door, back panel, wall, or rail
Connections Connection terminal terminals max. 1 x 1.5 mm
1)
Selectable
2)
same sensor type must be used for T1, T2, and T3
2
EN0B-0301GE51 R0104 2
CONTROL AND CONFIGURATION PARAMETER
R7426B,C TEMPERATURE CONTROLLER
Control Parameter Setting
Parameter Description
No. Name
Low High Default
Resolution
Unit
P.01 W1 Main setpoint for input T1 0 50 21 0.5 C
P.02 Wlim Limit setpoint (low or high) for input T2 5 50 16 1 C
P.03 Wcomp Compensation changeover point for input T3 -5 40 20 1 C
P.04 Wi Winter compensation authority -350 +350 0 2 %
P.05 Su Summer compensation authority -100 +100 0 1 %
P.06 Wcas Submaster or cascade setpoint OFF, 0 50 20 0.5 C
P.07 Rcas Cascade reset span adjustment 0 40 10 0.5 K
P.08 Xp1 Throttling range (main control loop) T1 0.5 40 2 0.5 K
P.09 Xp2 Throttling range (cascade control loop) T2 0.5 40 10 0.5 K
P.10 Xpc Cooling throttling range for sequence control OFF, 1 40 3 0.5 K
P.11 Xph Heating throttling range for sequence control 1 40 6 0.5 K
P.12 tr1
P.13 tr2
1)
Reset time (main control loop) T1 OFF, 20 s 20min OFF 10/0.5 sec/min
1)
Reset time (cascade control loop) T2 OFF, 20 s 20min OFF 10/0.5 sec/min
P.14 MINPOS Minimal pos. for air damper actuators 0 50 20 1 %
P.15 Ystart Start point for mid range shift of output Y1 -20 +20 0 0.5 K
P.16 SOFFS Offset of main setpoint in Standby mode 0 10 2 0.1 K
P.17 T1Cal Calibration of temperature sensor T1 -20 +20 0 0.1 K
P.18 T2Cal Calibration of temperature sensor T2 -20 +20 0 0.1 K
P.19 T3Cal Calibration of temperature sensor T3 -20 +20 0 0.1 K
P.20 RetOffs Return air offset to simulate exhaust air cond. OFF, 0 5 OFF 0.1 K
P.21 RuntimeY1 Actuator run time for output Y1 6 180 60 1 sec
P.22 RuntimeY3 Actuator run time for output Y3 6 180 60 1 sec
P.23 RuntimeY2 Actuator run time for output Y2 6 180 60 1 sec
P.24 NightLow Night low limit against temperature extremes OFF, 8 19 OFF 1 C
P.25 NightHigh Night high limit against temperature extremes OFF, 21 40 OFF 1 C
P.26 NOFFS Offset of main setpoint in Night mode 0 30 5 0.1 K
Config. Parameter
Values Default Unit
No. Name
C.01 DIR/REVY1 Dir
C.02 DIR/REVY3 Dir, Rev (R7426C, only) Dir
C.03 DIR/REVY2 Dir
C.04 Ctrltyp
2)
Lo = 0...50°C (factory preset), Hi1 = 0...130°C, Hi2 = 0...130°C
0 = internal (default), 1 = 5 K (953...1053 τ), 2 = 5 K (0 τ...100kτ),
C.05 CPATYP
3 = 15 … 30C (10...20 kτ), 4 = 5 K (0...10 kτ),
0
5 = 15 … 30C (0...100 kτ), 6 = 0...50C or 0...130C (0...100 kτ)
C.06 YRange 0 = 2 … 10 Vdc , 1 = 0 … 10 Vdc (R7426C, only) 1
C.08 Y1Mode 4
C.09 Y3Mode 4
C.10 Y2Mode
0= floating, 1= 2 stage ON/OFF, 2= 3 stage ON/OFF, 3 = pwm, 4 = unconfig.
(safe state is configured prior to controller's start-up) (R7426B, only)
4
0: Y1 = D, Y2 = C, Y3 = H 1: Y3/2/1 = H or C
C.11 YMode
2: Y3/1 = H, Y2 = C 3: Y3/1 = C, Y2 = H
0
4: Y1 = 2Pos D, Y2 = C, Y3 = H 5: Y3/1 = 15H, Y2 = C
C.12 T2ext 0 = T2 installed 1 = T1 signal used for T2 0
C.13 LimTyp 0 = Low limit 1 = High limit 0
C.14 Senstyp 0 = Auto detection 1 = NTC sensor type 0
C.15 Y1CTRF
Output Y1 used for: 0 = mixed air damper
1= energy recovery
0
C.16 AddHour Adjusts the month for winter/summer time change: 0 (disabled) = Min. 12 = Max. 3 month
C.17 SubHour Adjusts the month for summer/winter time change: 0 (disabled) = Min. 12 = Max. 10 month
3 EN0B-0301GE51 R0104
R7426B,C TEMPERATURE CONTROLLER
Config. Parameter
Values Default Unit
No. Name
C.18 PSTG_H3)Prestart gradient for heating: 0 (disabled) = Min. 2 = Max. 0 K/min
C.19 PSTG_C3)Prestart gradient for cooling: 0 (disabled) = Min. 2 = Max 0 K/min
C.20 tvd Use damper before comfort time: 0 (normal control) = Min. 90 = Max. 15 min
C.21
C.22
C.23
1)
for tr > 2 min resolution = 0.5 min, for tr < 2 min resolution = 10 sec
2)
actual value will not be changed during reset to default parameter
3)
can be overwritten by controller for self-adaption purposes, resolution = 0.01 K/min
FUNCTIONS
Real-Time Clock
The time clock performs automatic change of the controller
mode to OFF, Night, Standby, or Comfort in accordance with
the programmed time schedule. In Standby or Night mode,
the SOFFS or NOFFS is added (cooling) to and subtracted
(heating) from the calculated control point. Schedules for one
Adapt
2)
Adr
DefProg
Optimum Start Self Adaption speed: 0 = Min. 100 = Max. 50 %
Serial communication address: 0 = Min. 255 = Max. 254
0 = No Default programming 1 = Initiates Default programming 0
APPLICATION
The R7426B,C controllers can be used for sequence control
applications of heating, mixed air damper or energy recovery
system, and cooling.
NOTE: All diagrams show proportional control action, only.
If P+I control is in operation, the slopes for heating
and cooling are not defined.
week and up to six switching points per day can be programmed in advance and repeated week after week. In
addition, three different holiday schedule types H1, H2 and
H3 can be programmed. One of these holiday types can be
assigned to each holiday date of the year (01.01. ... 31.12.).
Holiday type H1 and H2 is valid only for this specific day and
is reset to normal time schedule at midnight of that day. H3 is
valid for every year and repeated year after year for fixed
holiday dates. H1 can be programmed to be in OFF mode
the whole day and H2 to be ON for a short period of time on
the last day of a longer holiday period to preheat or precool
the space in advance before the first occupied day.
Temperature Sequence Control with Heating,
Mixed Air Dampers, and Cooling
This application will be active with the R7426B,C controllers
when T2 is not connected. It can be used for sequence
control of a heating valve, a mixed air damper, and a cooling
valve.
The characteristic of each output on the R7426C controller
can be selected via the control parameters DIR/REVx
(x = Y1, Y2, or Y3). The diagram shows Dir characteristic for
all outputs.
Optimum Start Program
The optimum start program’s objective is to minimize total
energy consumption by calculating in room control applications the start time for heating and cooling mode which will
bring its respective space temperature to the boundary of the
comfort zone at the time of occupancy start. The program will
start the ventilation system at the calculated start time with
forced return air recirculation mixed air damper position or full
energy recovery valve position to minimize energy consumption during the start-up period. At a programmable time
before occupancy start, the controller will switch the output
signal Y1 to normal and will supply fresh air to the space in
mixed air applications. The optimum start program uses
historical data for self-adaptive adjustment.
Night Cycle Program
The night cycle program offers not only energy conservation,
but also the ability to assign OFF mode night low or high
limits with 1K hysteresis for the protection of a space and its
Within the range Xp1, the damper signal is controlled as
shown in the diagram below. If no cooling actuator is available, the control parameter Xpc can be set to OFF and the
damper output is maintained at 100% above control point
(CTRP1).
If the damper output should be decreased to MINPOS level
above control point (CTRP1) as shown in the diagram, the
control parameter Xpc has to be adjusted to any value
between 1 and 40 K, also if no cooling actuator is available.
Y[%]
100
MINPOS
0
Y3
Heating
Xph
Damper
Y1
CTRPH
1/4 Xp1 if Xpc = Off
Cooling
Xp1
CTRPC
Xpc
CTRP1
Y2
if Xpc = Off
Xwh / Xwc
contents against temperature extremes. It automatically
cycles between the user selected upper and lower limits and
turns on full heating or cooling whenever the limits are
reached.
NOTE: If the R7426B controller with floating output is used
for mixed air damper control, you must ensure that
the output load of maximum 450 mA is not
exceeded.
Xwd
/
T2
EN0B-0301GE51 R0104 4
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