Honeywell S7999B Manual De Usuario

51

65-0303—05

• Setpoint (for corresponding demand source)

• Burner firing rate

• Hysteresis on (for corresponding demand source)

• Hysteresis off (for corresponding demand source)

The Clear button is disabled for the PID analysis (doesn’t apply to 

hysteresis).

The default sample rate is 15 sec periods (a tick mark on the X axis 

for every 15 second period, with minutes displayed every 4 tick 

marks).

Special case trend analysis graph for R7910/R7911 vessel heat 

exchange can be selected.

Data included in the vessel analysis graph are:

• Outlet temperature

• Inlet temperature

• Heat exchange (outlet – inlet)

• Burner firing rate

Automatic sampling of trend data takes place when the trend 

analysis report is displayed. No user intervention is necessary to 

invoke sampling.

NOTE: Sample data is collected and stored in the S7999B. The 

R7910 or R7911 don’t collect any historical data for trending 

purposes. For this reason any S7999B reset causes all 

R7910 or R7911 sampling to start over with no data.

Trend analysis of the following data from each R7910/R7911 is 

possible:

The trend analysis snapshot file is stored in Comma Separated Value 

(CSV) format in the S7999B so it can be imported into a spreadsheet 

program such as Microsoft Excel.

The trend analysis snapshot file can be viewed in graph form on the 

S7999B. It is also accessible in an Ethernet FTP session with the 

S7999B. This FTP session can be used to export the trend analysis 

snapshot file from the S7999B.

Pressing the Diagnostics button permits some display hardware 

diagnostics (see Fig. 104). Normally, these diagnostics are 

NOTE: COM 1 Communication test is a factory-only test. Perform-

ing this text when not connected to a factory test fixture will 

always yield a “Failed” result.

Each test is invoked by pressing the Test button next to the 

diagnostic. The results of the diagnostic test (“PASS” or “FAIL”) 

display in the text box next to the Test button.

Display time can be configured in the S7999B and S7999C OI 

Displays and applied to the R7910A or R7911. A date and time is 

entered by the user at the display and any data that is timestamped is 

marked with the current time and date in the display.

Demand source

CH, DHW, LL (Lead Lag), or 

FP (Frost Protection) Steam 

Sensor

Outlet temperature (R7910 

only)
Firing rate

% or RPM

Fan speed

PWM feedback

Flame signal strength

V

Inlet temperature (R7910 

only)

If enabled

DHW temperature (R7910 

only)

If enabled

Outdoor temperature

If enabled

Stack temperature

If enabled

Header temperature (R7910 

only)

If enabled

CH setpoint

Actual CH setpoint based on 

time of day (TOD).

DHW setpoint (R7910 only)

Actual DHW setpoint based 

on TOD.

Central Heat Operation 

Analysis
Domestic Hot Water 

Operation Analysis (R7910 

only)
Vessel Analysis