R7426A,B,C TEMPERATURE CONTROLLER WITH AND WITHOUT REAL-TIME CLOCK

control par.

description

setting I / setting II

 

reso-

unit

R7426

actual

no.

name

low

high

def.

lution

A

B

C

value

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.01

W1

Main setpoint for input T1

0

50 /

21

/

0.5

°C

x

x

x

 

130

70

 

 

 

 

 

 

 

 

 

 

 

 

 

P.02

Wlim

Limit setpoint (low or high) for input T2

5 /

50 /

16

/

1

°C

x

x

x

 

30

130

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.03

Wcomp

Compensation changeover point for input T3

-5

40

20

 

1

°C

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.04

Wi

Winter compensation authority

-350

+350

0

 

2

%

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.05

Su

Summer compensation authority

-100

+100

0

 

1

%

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.06

Wcas

Submaster or cascade setpoint

OFF, 0

50

20

 

0.5

°C

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.07

Rcas

Cascade reset span adjustment

0

40

10

 

0.5

K

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.08

Xp1

Throttling range (main control loop) for T1

0.5

40

2

 

0.5

K

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.09

Xp2

Throttling range (cascade or limit control loop)

0.5

40

10

 

0.5

K

x

x

x

 

for T2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.10

Xpc

Cooling throttling range for sequence control

OFF, 1

40

3

 

0.5

K

 

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.11

Xph

Heating throttling range for sequence control

1

40

6

 

0.5

K

 

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

P.12

tr11)

Reset time (main control loop)

OFF,

20

OFF

10/

sec/

x

x

x

 

 

 

 

20 sec

min

 

 

0.5

min

 

 

 

 

P.13

tr21)

Reset time (cascade control loop)

OFF,

20

OFF

10/

sec/

x

x

x

 

 

 

 

20 sec

min

 

 

0.5

min

 

 

 

 

P.14

MINPOS

Minimal pos. for air damper actuators

0

50

20

 

1

%

 

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.15

Ystart

Start point for mid range shift of output Y1

-20

+20

0

 

0.5

K

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.16

SOFFS

Offset of main setpoint in Standby mode

0

10

2

 

0.1

K

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.17

T1Cal

Calibration of temperature sensor T1

-20

+20

0

 

0.1

K

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.18

T2Cal

Calibration of temperature sensor T2

-20

+20

0

 

0.1

K

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.19

T3Cal

Calibration of temperature sensor T3

-20

+20

0

 

0.1

K

x

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

P.20

RetOffs

Return air offset to simulate exhaust air cond.

OFF, 0

5

OFF

0.1

K

 

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.21

RuntimeY1

Actuator run time for Y1

6

180

60

 

1

sec

x

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.22

RuntimeY3

Actuator run time for Y3

6

180

60

 

1

sec

 

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.23

RuntimeY2

Actuator run time for Y2

6

180

60

 

1

sec

 

x

 

 

 

 

 

 

 

 

 

 

 

 

 

 

P.24

NightLow2)

Night low limit against temperature extremes

OFF, 8

19

OFF

1

°C

x

x

x

 

P.25

NightHigh2)

Night high limit against temperature extremes

OFF, 21

40

OFF

1

°C

x

x

x

 

P.26

NOFFS2)

Offset of main setpoint in Night mode

0

30

5

 

0.1

K

x

x

x

 

1)for tr > 2 min ⇒ resolution = 0.5 min, for tr < 2 min ⇒ resolution = 10 sec

2)on Controllers with Real-Time Clock, only

For detailed information of control parameters see chapter Parameter Settings and Adjustment.

Table 5. Control parameters R7426A,B,C

5

EN1B-0203GE51 R0507C

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Honeywell R7426C, R7426B, R7426A dimensions Minpos, Soffs, Noffs
Page 4 Page 6

R7426C, R7426A, R7426B specifications

Honeywell's R7426 series comprises three advanced models: R7426B, R7426A, and R7426C. These devices are designed to optimize control for HVAC applications, emphasizing energy efficiency, ease of use, and superior control capabilities. Each model incorporates unique features and technologies catering to specific system requirements while maintaining common foundational characteristics.

The R7426B is engineered with a microprocessor-based control system, allowing for precise temperature management across varied environments. It supports a range of heating and cooling applications, making it versatile in both residential and commercial settings. The unit boasts dual-stage heating and cooling capabilities, ensuring optimal comfort by allowing for gradual temperature changes. It also includes an easy-to-read LCD display for user-friendly navigation and parameter adjustments.

R7426A enhances functionality with additional communication technologies. This model incorporates Honeywell's proprietary communication protocols, enabling seamless connection with smart thermostats and home automation systems. This ensures users can monitor and control their HVAC systems remotely, leading to enhanced energy management and convenience. R7426A also includes advanced diagnostic capabilities that simplify troubleshooting and maintenance processes.

R7426C further extends the capabilities of the series by integrating state-of-the-art sensors for real-time environmental monitoring. These sensors continuously track indoor air quality parameters such as humidity and particulate matter levels, allowing for immediate adjustments to maintain optimal indoor conditions. The model is also equipped with smart algorithms that learn user preferences over time, automatically adjusting settings to enhance comfort and efficiency.

Common features across the R7426 series include robust construction for long-lasting performance and compatibility with a wide range of HVAC systems, including heat pumps and conventional heating systems. Each model supports programmable settings, enabling users to create schedules that align with their unique lifestyle or business needs. Safety features, including freeze protection and delay timers, are integrated to safeguard against potential system failures.

Overall, the Honeywell R7426B, R7426A, and R7426C models represent a significant advancement in HVAC control technology. With their focus on efficiency, automation, and user-centric design, these devices help users achieve optimal climate management in their spaces while minimizing energy consumption. Whether for residential comfort or commercial efficiency, these models stand out as reliable solutions in the HVAC market.
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