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Honeywell W7752D Offset, Absolutemiddle, Nobutton, Bypassunoccupied, Lastwins, Networkwins

Models: W7752D

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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nciWallMod

nciWallMod

nciWallMod

nciWallMod

nciWallMod

field name

use_wall_mod_st_pt

set_pnt_knob

override_type

override_priority

display_type

Table C2. Configuration Variables for Excel 10 FCU Controllers

engineering units:

digital

 

 

state

default

comments

English (metric) or states

or

plus range

 

 

value

 

 

 

 

 

Bit

 

YES

This configuration variable specifies whether the setpoint used is from

NO

0

 

the knob on the wall module connected to the controller or from the

YES

1

 

network via nciTempSetPts. If set to NO, all setpoints to be used come

 

 

 

from the network via nciTempSetPts. If set to YES, an additional option

 

 

 

set_pnt_knob must be set to specify type of setpoint adjustment (see

 

 

 

below).

 

 

 

 

2 Bits

 

OFFSET

This configuration variable specifies specifies the usage of the setpoint

OFFSET

0

 

knob on the wall module for the occupied setpoint. OFFSET specifies a

ABSOLUTE_MIDDLE

2

 

relative scale on the wall module where the setpoint is calculated by

 

 

 

adding the setpoint potentiometer value (± 5 K) to the appropriate

 

 

 

value of nciTempSetPts. ABSOLUTE_MIDDLE specifies an absolute

 

 

 

scale on the wall module. The setpoint knob directly determines the

 

 

 

center point of occupied cooling and heating setpoints. The respective

 

 

 

cooling and heating setpoint is determined by the setpoint knob

 

 

 

position adding or subtracting half of the user selectable ZEB defined

 

 

 

in nciSetPnts.<occ_mode>_cool or nciSetPnts.<occ_mode>_heat .

 

 

 

This applies to <occ_mode> OCCUPIED and STANDBY.

 

 

 

 

2 Bits

 

BYPASS_UNOCCUPIE

This configuration variable specifies the behavior of the override

NO_BUTTON

0

D

button. BYPASS_UNOCCUPIED allows overriding the current

BYPASS_UNOCCUPIED

1

 

occupancy mode to OCCUPIED for a configurable bypass time, or

BYPASS

2

 

causing a permanent override to UNOCCUPIED. BYPASS allows only

 

 

 

the temporary override to OCCUPIED and canceling it.

 

 

 

 

Bit

 

LAST_WINS

This configuration variable specifies the priority of the local (wall

LAST_WINS

0

 

module push-button) or central (network interface) override. If

NETWORK_WINS

1

 

NETWORK_WINS is set and the network sends value NUL, then the

 

 

 

override button is active.

 

 

 

 

Bit

 

LED_OVERRIDE

This configuration variable specifies the display of occupancy and/or

LED_OVERRIDE

0

 

override. LED_OVERRIDE shows the override from the bypass button

LED_OCCUPANCY

1

 

or from the network. LED_OCCUPANCY shows the effective

LCD_DISPLAY

2

 

occupancy mode. LCD_DISPLAY is only used for T7560 Wall Modules.

 

 

 

The display shows the occupancy mode with different symbols, and the

 

 

 

override mode with flashing symbols.

EN2B-0285GE51 R0909

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Honeywell W7752D Offset, Absolutemiddle, Nobutton, Bypassunoccupied, Lastwins, Networkwins, Ledoverride, Ledoccupancy
Page 47 Page 49

W7752D specifications

The Honeywell W7752D is a versatile and advanced electronic gas combination control designed primarily for use in commercial heating systems. This product stands out for its ability to manage both gas ignition and safety functions, which are critical for maintaining the efficiency and safety of heating appliances. Its robust construction and advanced features make it a popular choice for HVAC professionals and service technicians.

One of the main features of the W7752D is its integration of multiple functions in a single device. It serves as both an automatic gas ignition control and a safety shut-off valve, which simplifies installation and reduces the need for additional components. This integrated design not only enhances reliability but also streamlines maintenance procedures.

Another notable technology utilized in the W7752D is its microprocessor-based control logic. This advanced technology allows for precise management of the ignition sequence, improving the overall efficiency of the heating system. The microprocessor enables the control to adapt to varying operating conditions, ensuring optimal performance even under changing demands.

The W7752D is equipped with features that enhance user-interface and diagnostics capabilities. It includes LED indicators that provide clear information about the operational status and any potential issues. This diagnostics capability facilitates easier troubleshooting, saving time and reducing the likelihood of extended downtimes.

Safety is a primary concern in gas appliances, and the W7752D addresses this with built-in safety mechanisms, including flame detection technologies. These features ensure that the appliance operates safely, automatically shutting down in case of any irregularities during operation. This emphasis on safety not only protects property but also provides peace of mind for users.

In terms of compatibility, the Honeywell W7752D is designed to work with a wide range of gas heating appliances. Its flexibility allows it to be used in various applications, making it suitable for different types of commercial environments. Additionally, the control complies with relevant safety and performance standards, ensuring reliable operation.

In summary, the Honeywell W7752D combines advanced technology with essential safety features, making it a top choice for commercial heating applications. Its integrated design, microprocessor-based control, user-friendly diagnostics, and robust safety mechanisms make it an essential component for efficient and safe gas heating systems. Whether it is for new installations or replacements, the W7752D provides HVAC professionals with the reliability and ease of use they demand.