Modulex Light Commercial Series
SECTION 6: Gas Supply and Piping
OMM-0158_A
• 6/28/2022 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
87
of
120
PARAMETER
DESCRIPTION
ENTRY RANGE
DEFAULT
649
Burner: Minimum Setpoint
68°F to Param. 39
(20°C to Param. 39)
68F (20C)
346
Minimum modulation:
This parameter plays a part (along with
others) in the algorithm that determines
when burners are turned on/off.
NOTE: This is
not
the minimum firing rate
of the boiler.
0-100%
MLX EXT 450 2S
-1100 2S: 31%
MLX EXT 1500 2S
-3000 2S: 28%
800
Burners: minimum inserted
1-8
1
616
Cascade: insert lock time
(Burner insertion delay time)
30 - 900 sec
120 sec
613
Cascade: remove lock time
(Burner removal delay time)
30 - 900 sec
MLX EXT 450 2S
-1100 2S: 120 sec
MLX EXT 1500 2S
-3000 2S: 60 sec
674
Generator: automatic restart
(How often the boiler changes the
operating burners to balance wear and
tear).
1-10 hr
2 H
647
Disable Burners Map
- NOT APPLICABLE.
Note: Leave at default value of 0
0
648
First Burner Priority
- NOT APPLICABLE.
Note: Leave at default value of 0
0
336
Temperature control: slope limit
2°F to 54°F/min
(1°C to 30°C/min)
9°F/min (5°C/min)
353
Temperature control: proportional band
0°F to 90°F
(0°C to 50°C)
Units may be expressed
in R or K
45°F (25C)
354
Temperature control: integral gain
0-50
12
478
Temperature control: derivative gain
0-50
0
816
Modbus Address
1-127
1
817
Modbus Communication Timeout
0 - 240 sec
30 sec
896
Temperature unit
0: °C
1: °F
See Description
1
309
System configuration
(Application Code)
0 = Burner cascade (BMM)
1 = DO NOT USE
See Description
0
368
Programmable Relay #1 (BCM Y4-1/2)
Function
(BCM connector Y4, terminals 1 and 2)
0 = Primary Pump (boiler loop) control
1 = Boiler status contact (closes when at
least one burner is on, opens when all
the burners are off)
See Description
0
