Thermal Solutions APEX APX425C Installation, Operating And Service Instructions page 112

10
Operation
(continued)
Table 10-26: Modbus Register List (continued)
Modbus Protocol
Register Name
410007 Supply sensor
410011 Return sensor
410013 Header sensor
410014 Stack sensor
410170 Outdoor sensor
400015 4 - 20 mA sensor
Modbus Outdoor
410817
Temp
400581 CH Modbus Rate
Fan Speed
400008
Measured
Fan Speed
400009
Commanded
400010 Flame signal
400033 Burner control state
112
TEMPERATURE SENSORS
-40 F (-40°C) to 266 F (130°C)
-40 F (-40°C) to 266 F (130°C)
-40 F (-40°C) to 266 F (130°C)
-40 F (-40°C) to 266 F (130°C)
-40 F (-40°C) to 266 F (130°C)
mA value for S2 (J8-6) parameter selectable as
(remote set point) & (remote modulation)
Building Automation may send the controller the outdoor air temperature. Use
this register to change the outdoor temperature. When this register is not written
every "Modbus Command Time Out" parameter seconds (default 30 seconds),
temperature is set to bad data quality and outdoor air reset is set back to local
setpoint.
valid range -40°F to 302°F
BURNER
Use this register to drive individual boiler firing rates. This register is used when
firing rate control is performed by an external building automation system.
Firing rate reverts to local control when register is not written every "Modbus
Command Time Out" parameter seconds (default 30 seconds),
Range is 0 to 200 % provides 0-100% firing rate.
Speed of the combustion air blower in rpm
Speed of the combustion air blower in rpm
0.01V or 0.01μA precision (0.00-50.00V)
0 Initiate
1 Standby Delay
2 Standby
3 Safe Startup
4 Prepurge - Drive to Purge Rate
5 Prepurge – Measured Purge Time
6 Prepurge – Drive to Lightoff Rate
7 Preignition Test
8 Preignition Time
9 Pilot Flame Establishing Period
10 Main Flame Establishing Period
11 Direct Burner Ignition
12 Run
13 Postpurge
14 Lockout
APEX Installation, Operating, & Service Instructions
Description
Read (R) /
Write (W)
R
R
R
R
R
R
W
W
R
R
R
R
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