EXCEL 10 FCU CONTROLLER LNS PLUG-INS USER GUIDE

NV name

nvoActiveSetPt

nvoAlarm

nvoAlarm

nvoAlarm (continued)

nvoAlarm

field name

subnet

node

type

Table C4. Output Variables for Excel 10 FCU Controllers.

engineering units:

digital

 

 

state

default

comments

English (metric) or states plus

or

range

 

 

value

 

 

 

 

 

SNVT_temp_p

 

 

This output variable shows the active setpoint of the control

50 to 95°F (10 to 35°C)

 

 

algorithm. It is based upon the occupancy setpoints, the offset, and

621.806°F (327.67°C) =

 

 

recovery ramping.

INVALID

 

 

 

 

 

 

 

UBYTE

 

 

This output variable is the LonWorks subnet number (in domain

0 to 255

 

 

entry 1 of the node’s domain table).

 

 

 

 

UBYTE

 

 

This output variable is the LonWorks node number (in domain

0 to 255

 

 

entry 1 of the node’s domain table).

 

 

 

 

UBYTE

 

RETURN_TO_NORMAL

This output variable reports the latest changed error condition

ALM_NO_ALARM

0

(at application restart)

detected in the node. The first 5 bits are used for the alarm type

ALM_NODE_OFF

1

 

number, and this number is added to RETURN_TO_NORMAL

ALM_FROST

2

 

(128) when the error condition is no longer true. Each error

ALM_INVALID_SETPNT

3

 

condition/return-to-normal is issued only once. The type is also

ALM_TEMP_SENSOR_FAIL

4

 

recorded in nvoAlarmLog and nvoFcuStatus.alarm_type.

ALM_SETPNT_KNOB_FAIL

5

 

Alarm reporting is suppressed by settin nviManualMode to

ALM_FAN_SPEED_SW_FAIL

6

 

ALM_FAN_FAILURE

7

 

SUPPRESS_ALARMS, in which case nvoAlarm.type is set to

ALM_COMFAIL_SPACETEMP

8

 

ALARM_NOTIFY_DISABLED. Alarm reporting is turned ON again

ALM_COMFAIL_HVACMODE

9

 

by setting nviManualMode to UNSUPPRESS_ALARMS, after

ALM_COMFAIL_SETPTOFFS

10

 

which all existing alarms (or ALM_NO_ALARM) are reported one

ALM_COMFAIL_SCHEDOCC

11

 

at a time.

ALM_COMFAIL_DLC

12

 

 

ALM_COMFAIL_TEMPRESET

13

 

 

ALM_COMFAIL_ODTEMP

14

 

 

ALM_COMFAIL_OCCSENSOR

15

 

 

ALM_COMFAIL_WINDOW

16

 

 

ALM_COMFAIL_MANHEAT

17

 

 

ALM_COMFAIL_MANCOOL

18

 

 

ALM_HW_SW_MISMATCH

19

 

 

RETURN_TO_NORMAL

128

 

 

RTN_NODE_OFF

129

 

 

RTN_FROST

130

 

 

RTN_INVALID_SETPNT

131

 

 

RTN_TEMP_SENSOR_FAIL

132

 

 

RTN_SETPNT_KNOB_FAIL

133

 

 

RTN_FAN_SPEED_SW_FAIL

134

 

 

RTN_FAN_FAILURE

135

 

 

RTN_COMFAIL_SPACETEMP

136

 

 

RTN_COMFAIL_HVACMODE

137

 

 

 

 

53

EN2B-0285GE51 R0909

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Honeywell W7752D specifications Table C4. Output Variables for Excel 10 FCU Controllers
Page 54 Page 56

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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