EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nvoAlarmStatus

nvoApplicMode

nvoCoolOutput

nvoDigitInState

nvoDigitInState

nvoEffectOcc

nvoFanSpeed

nvoFanSpeed

field name

error_bit[2]

value

state

value

state

Table C4. Output Variables for Excel 10 FCU Controllers.

engineering units:

digital

 

 

state

default

comments

English (metric) or states plus

or

range

 

 

value

 

 

 

 

 

UBYTE

 

 

See above.

Bit coded Alarm:

1

 

 

ALM_COMFAIL_MANHEAT

 

 

ALM_COMFAIL_MANCOOL

2

 

 

ALM_HW_SW_MISMATCH

4

 

 

 

 

 

 

SNVT_hvac_mode

 

HVAC_OFF

This output variable is used to coordinate the slave devices with

HVAC_AUTO

0

(at application restart)

the master controller. It reflects the current heat/cool medium

HVAC_HEAT

1

 

based upon the available supply energy. This is required for con-

HVAC_COOL

3

 

figurations with heat/cool changeover. HVAC_OFF switches the

HVAC_OFF

6

 

heat/cool control OFF while still providing frost protection and

 

 

 

reporting status and alarms.

 

 

 

 

SNVT_lev_percent

 

 

This output variable is the cooling output which is typically used for

0 to 100%

 

 

monitoring or bound to a cooling actuator node or another con-

163.835% = INVALID

 

 

troller operating as slave. nvoCoolOutput will be transmitted

 

 

 

immediately when its value has changed significantly (>= 1%), and

 

 

 

periodically according to nciSndHrtBt. The output value represents

 

 

 

the output of the control algorithm but is limited to a range of 0% to

 

 

 

100%.

SNVT_switch.value

 

 

This output variable indicates the binary state of the controller's

0 to 100%

 

 

digital input which can be configured to support a window contact,

 

 

 

an occupancy/movement sensor, an air flow contact, or a heat/cool

 

 

 

changeover contact. It can be bound to another Excel 10 controller

 

 

 

or a third party node.

 

 

 

 

SNVT_switch.state

0

 

See above.

OFF

 

 

ON

1

 

 

NOT_ASSIGNED

255

 

 

SNVT_occupancy

 

 

This output variable reflects the effective occupancy mode derived

OC_OCCUPIED

0

 

from the time schedule, occupancy sensor, override button, and

OC_UNOCCUPIED

1

 

network occupancy override.

OC_BYPASS

2

 

 

OC_STANDBY

3

 

 

SNVT_switch.value

 

0 (at application restart)

This output variable reports the fan speed for the controller. It can

0 to 100%

 

 

be bound to another Excel 10 controller with a fan connected or to

 

 

 

a third-party fan node.

 

 

 

 

SNVT_switch.state

 

NO_FAN

See above.

OFF

0

(at application restart)

 

ON

1

 

 

 

 

55

EN2B-0285GE51 R0909

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Image 57
Honeywell W7752D specifications Almcomfailmanheat Almcomfailmancool Almhwswmismatch, OFF Notassigned, Ocbypass Ocstandby
Page 56 Page 58

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.
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