EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nvoAlarmLog

nvoAlarmLog

nvoAlarmLog

nvoAlarmLog

nvoAlarmLog

nvoAlarmStatus

nvoAlarmStatus

field name

alarm_type[0]

alarm_type[1] alarm_type[2] alarm_type[3] alarm_type[4] error_bit[0]

error_bit[1]

Table C4. Output Variables for Excel 10 FCU Controllers.

engineering units:

digital

 

 

state

default

comments

English (metric) or states plus

or

range

 

 

value

 

 

 

 

 

RTN_COMFAIL_SETPTOFFS

138

 

 

RTN_COMFAIL_SCHEDOCC

139

 

 

RTN_COMFAIL_DLC

140

 

 

RTN_COMFAIL_TEMPRESET

141

 

 

RTN_COMFAIL_ODTEMP

142

 

 

RTN_COMFAIL_OCCSENSOR

143

 

 

RTN_COMFAIL_WINDOW

144

 

 

RTN_COMFAIL_MANHEAT

145

 

 

RTN_COMFAIL_MANCOOL

146

 

 

RTN_HW_SW_MISMATCH

147

 

 

ALARM_NOTIFY_DISABLED

255

 

 

 

 

 

 

Same as nvoAlarm.type

 

See nvoAlarm.type

A central node may poll this output variable for a short history of

 

 

 

alarms. It contains the last five alarms reported via nvoAlarm. At

 

 

 

the time a new nvoAlarm is issued, nvoAlarmLog is updated.

 

 

 

 

Same as nvoAlarm.type

 

See nvoAlarm.type

See above.

 

 

 

 

Same as nvoAlarm.type

 

See nvoAlarm.type

See above.

 

 

 

 

Same as nvoAlarm.type

 

See nvoAlarm.type

See above.

 

 

 

 

Same as nvoAlarm.type

 

See nvoAlarm.type

See above. nvoAlarmLog.alarm_type[4] is the oldest alarm.

 

 

 

 

UBYTE

 

 

This output variable is a polled output containing a list of all the

Bit coded Alarm:

 

 

current errors detected by the node. A search for error conditions

ALM_NODE_OFF

1

 

in the node is made periodically. A central node may poll the

ALM_FROST

2

 

nvoAlarmStatus output for all of the current errors. nvoAlarmStatus

ALM_INVALID_SETPNT

4

 

contains all the current detected errors even though they may be

ALM_TEMP_SENSOR_FAIL

8

 

suppressed for reporting by nvoAlarm.

ALM_SETPNT_KNOB_FAIL

16

 

 

ALM_FAN_SPEED_SW_FAIL

32

 

 

ALM_FAN_FAILURE

64

 

 

ALM_COMFAIL_SPACETEMP

128

 

 

 

 

 

 

UBYTE

 

 

See above.

Bit coded Alarm:

1

 

 

ALM_COMFAIL_HVACMODE

 

 

ALM_COMFAIL_SETPTOFFS

2

 

 

ALM_COMFAIL_SCHEDOCC

4

 

 

ALM_COMFAIL_DLC

8

 

 

ALM_COMFAIL_TEMPRESET

16

 

 

ALM_COMFAIL_ODTEMP

32

 

 

ALM_COMFAIL_OCCSENSOR

64

 

 

ALM_COMFAIL_WINDOW

128

 

 

 

 

 

 

EN2B-0285GE51 R0909

54

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Honeywell W7752D Rtncomfailsetptoffs, Rtncomfailschedocc, Rtncomfaildlc, Rtncomfailtempreset, Rtncomfailodtemp
Page 55 Page 57

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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