Boiler Control Instruction & Operation Manual
Page
29 of
68
Installation
Energy Management Interface
Table 8: Modbus Signal List (continued)
Status
Description
110
On from local Mix demand
111
On from Lead Lag Mix demand
112
On from local Central Heat service
113
On from Lead Lag Central Heat service
114
On from local DHW service
115
On from Lead Lag DHW service
116
On from local Mix service
117
On from Lead Lag Mix service
118
On from Lead Lag auxiliary pump X
119
On from Lead Lag auxiliary pump Y
120
On from Lead Lag auxiliary pump Z
121
On, but inhibited by pump start delay
122
On from pump override
123
Off, not needed
124
On from burner demand
125
On from exercise
126
On from local Lead Lag service
127
On from local Lead Lag pump demand
Modbus
Register
Protocol
Name
Description
Read (R)/
Write (W)
Pump Status
96
CH pump status
See Table 9
R
100
DHW pump status
See Table 9
R
108
Boiler pump status
See Table 9
R
128-
129
Burner cycle count
0-999,999 (U32)
R/W
130-
131
Burner run time
Hours (U32)
R/W
132-
133
System pump cycle
count
0-999,999 (U32)
R/W
134-
135
DHW pump cycle
count
0-999,999 (U32)
R/W
400,138-
400,139
Boiler pump cycle
count
0-999,999 (U32)
R/W
Status Description
92
Forced On from manual pump control
93
Forced On due to Outlet high limit is active
94
Forced On from burner demand
95
Forced On due to Lead Lag slave has
demand
96
Forced Off from local DHW priority service
97
Forced Off from Lead Lag DHW priority
service
98
Forced Off from Central Heat anti-
condensation
99
Forced Off from DHW anti-condensation
100
Forced Off due to DHW high limit is active
101
Forced Off from EnviraCOM DHW priority
service
102
On due to local CH frost protection is active
103
On due to Lead Lag CH frost protection is
active
104
On due to local DHW frost protection is
active
105
On due to Lead Lag DHW frost protection
is active
106
On from local Central Heat demand
107
On from Lead Lag Central Heat demand
108
On from local DHW demand
109
On from Lead Lag DHW demand
Table 9: Pump Status Codes
