Appendix A: Bcm Parameters - Watts AERCO EXT Installation, Operation & Maintenance Manual

Ufly Controller and BCM for Modulex EXT

0 APPENDIX A: BCM PARAMETERS

APPENDIX A: BCM PARAMETERS
This section provides the list of the parameters in the BCM. See Section 3.4 for instructions on
how to navigate to the BCM parameters.
PARAMETER DESCRIPTION
Enabled services
16 = Control via Modbus*
17 = Heating only
18 = Antifreeze only
19 = Heating + Antifreeze
24 = DHW only
803
25 = Heating + DHW
26 = DHW + Antifreeze
27 = Heating + DHW + Antifreeze
* - Control via Modbus examples: AERCO ACS,
Remote Setpoint from BAS/EMS
Maximum Differential Temperature
483
(Water ΔT protection)
34 Burner Hysteresis
31 CH#1: Minimum Setpoint
39 CH#1: Maximum Setpoint
Analogue input function 0/10 V:
0 = Backup Controller (BCM) target
temperature
1 = External temperature sensor
799
2 = 0-10 V Remote Setpoint
3 = DO NOT USE
See Sections 4.1.1, 4.3.2 and 6.3.1
Programmable Input #1 function
0 = CH Service Enable/Disable
1 = System Enable/Disable
376
2 = DO NOT USE
3 = Backup Controller (BCM) Remote
activation
See Sections 4.5 and 6.3.2
322 Pump Off Delay
OMM-0159_A • 6/28/2022 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
ENTRY RANGE DEFAULT
See Description 19
MLX EXT 450 2S
-1100 2S: 45°F
0°F/2°F – 90°F
(25°C)
(0°C/1°C-50°C)
0 = Disabled;
MLX EXT 1500 2S
Units may be expressed
in R or K
-3000 2S: 54°F
(30°C)
9°F to 36°F
(5°C to 20°C)
9°F (5°C)
Units may be expressed
in R or K
68°F to 221°F
86°F
(20°C to 105°C)
68°F to 221°F
185°F
(20°C to 105°C)
See Description 1
See Description 0
1 - 10 min 3 min
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