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Honeywell W7752D Off Nul, Rqnormal Rqupdatestatus Rqupdatealarm Rqreportmask, Invalid

Models: W7752D

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EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nviReheatRelay

nviReheatRelay

nviRequest

nviRequest

nviSensorOcc

nviSetPoint

field name

value

state

object_id

object_request

Table C3. Input Variables for Excel 10 FCU Controllers

engineering units:

digital

 

 

state

default

comments

English (metric) or states plus

or

range

 

 

value

 

 

 

 

 

 

 

 

 

SNVT_switch

 

0 (at application restart)

This input variable is used to control the reheat relay via the

0 to 100%

 

 

network. This permits use of the relay as an auxiliary output in

 

 

 

applications where reheat is not required as well master/slave

 

 

 

applications where the reheat output is controlled by another

 

 

 

controller acting as master.

SNVT_switch

0

OFF (at application restart)

See above.

OFF

 

 

ON

1

 

 

NUL

255

 

 

 

 

 

 

SNVT_obj_request

 

 

This input variable belongs to the Node Object and provides the

UWORD

 

 

mechanism to request a particular mode for a particular object

0=Node Object

 

 

within a node.

1=Fan Coil Object

 

 

 

 

 

 

 

object_request_t

 

 

See above. Commanding any modes other the ones listed will

Enum from Echelon defined

0

 

result in an “invalid_request” when reading nvoStatus.

RQ_NORMAL

 

 

RQ_UPDATE_STATUS

2

 

 

RQ_UPDATE_ALARM

4

 

 

RQ_REPORT_MASK

5

 

 

 

 

 

 

SNVT_occupancy

 

OC_NUL

This input variable allows an occupancy sensor of another Excel

OC_OCCUPIED

0

(if bound but fails to be

10 controller to be used to indicate the sensed occupancy state of

OC_UNOCCUPIED

1

received or at application

the space. OC_NUL means no input is available because it is not

OC_BYPASS

2

restart)

bound, bound but not received periodically, or not configured by

OC_NUL

255

 

nciFcuConfig.DI1_config. More than one occupancy sensor may

 

 

 

be bound to nviSensorOcc. If any one sensor detects occupancy,

 

 

 

the controller considers the space occupied.

 

 

 

 

SNVT_temp_p

 

INVALID

This input variable is used for binding third party nodes to

50 to 95°F (10 to 35°C)

 

(at application restart)

authorize them for setpoint modifications. When this has been

327.67°C = INVALID

 

 

bound and a valid update is received, the local configured set-

 

 

 

points will no longer be directly used to determine the current

 

 

 

occupancy setpoint. For OCCUPIED and STANDBY modes, this

 

 

 

is used with the appropriate ZEB (derived from the configured

 

 

 

setpoints), for UNOCCUPIED mode the setpoint does not depend

 

 

 

upon this input, but upon nciTempSetPts.unoccupied_cool/_heat

 

 

 

only. nviSetpoint is stored in RAM and gets lost after power

 

 

 

failure. In this case, the setpoints of nciTempSetPts will be used

 

 

 

until a valid nviSetpoint is received.

 

 

 

 

49

EN2B-0285GE51 R0909

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Honeywell W7752D specifications Off Nul, Rqnormal Rqupdatestatus Rqupdatealarm Rqreportmask, Invalid
Page 50 Page 52

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.