Watts AERCO EXT Installation, Operation & Maintenance Manual page 55

Ufly Controller and BCM for Modulex EXT
CHAPTER 6: BOILER COMMUNICATIONS MODULE (BCM)
1. Access Device Management from Main Menu; select hcm > Parameter Settings
2. Scroll to Parameter 803 and set its value to 16. This allows Control via Modbus such as
via AERCO ACS or BAS/EMS.
799: 0/10V input 803: Enabled services 803: Enabled services
483: Max differential temperature 483: Max differential temperature 376: Input#1: function
34: Burner Hysteresis 322: Pump: overrun 34: Burner Hysteresis
341: Pump: minimum control
31: CH#1: Minimum setpoint 31: CH#1: Minimum setpoint
39: CH#1: Maximum setpoint 39: CH#1: Maximum setpoint 313: Pump: maximum control
3. Scroll to Parameter 816 and set the Modbus address for this BCM.
Once the desired address has been set on each BCM, the Modulex Boiler is configured for
Modbus Network control by the controlling Master EMS/BAS or AERCO ACS. For the BCM to
automatically act as the Back-Up Controller if the Modbus Master signal is lost, Parameter 376 of
the BCM must be set to 3 and a jumper must be installed on terminals TA/9 of connector Y2 (see
section 6.3.2 for details)
See Chapter 8 and GF-124 Chapter 2 for Modbus points for the BCM and ACS.
OMM-0159_A_A • 6/28/2022
hcm hcm hcm
16
19 19 2
0 0
0
°R °R
9 9
5
min °R °R
77 90
3.0
Volt °F °F
140 185
10.0
Volt
°F °F
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