Lx Series Installation and Operation Instructions
│
Trinity Lx
51
11.0 LEAD LAG INSTRUCTIONS
Multiple Boiler Applications
The Lx controller has the internal capacity to stage or Lead-Lag up to 8 boilers configured in a cascade. This
Lead-Lag capability allows a designated “Master” boiler to communicate with and effectively control each
boiler in a multiple boiler system. This function is accomplished by “Daisy Chaining” a 3-wire cable between
each of the boilers and enabling the Master parameter in the boiler of your choice. The boiler with the Master
parameter enabled becomes the single point of contact for Central Heating, Domestic Hot Water and Outdoor
Reset settings and control. Use the instructions detailed in this section to set-up and install the cascade boiler
system; reference
Appendix A – Controller and Touchscreen Display Instructions
for details on more advanced
settings and for assistance with navigating the touchscreen display.
Lead Lag Instructions - Common
Plumbing
– install as many as 8 Lx boilers in parallel in a primary/secondary plumbing configuration as
illustrated in Figure 11-1. Size common piping as per Table 11-1.
Boiler Pump
– each boiler must have its own circulator (see Figure 11-1) which is controlled by its
PUMP B
output; see
Field Wiring
Figures and Tables 12-1(a) and 12-1(b). The Boiler Pump must be sized according
to Table 10-4.
Communication Wiring
– using 3-wire cable, daisy-chain terminals
LL DATA +
, LL
DATA –
and
SENSOR
COM
of each boiler in parallel; see
Field Wiring
Tables 12-2(a) and 12-2(b) and Figure 12-2.
System Sensor (Optional)
– install a system sensor (NTI P/N: 84010) on the outlet (supply) pipe feeding the
heating system, see Figure 11-1. Wire the system sensor to
SENSOR COM
and
SYSTEM (OD / SYS SENSOR
for Lx500-800 models) of the Master Boiler; see
Field Wiring
Tables 12-2(a) and 12-2(b) and Figure 12-2.
The system sensor automatically becomes the modulation sensor for the boiler system, i.e. the control attempts
to achieve setpoint temperature at the location of the sensor. If a system sensor is
NOT
used, at the Master
boiler set the applicable sensor input to
Unconfigured
as follows:
Configure
– Sensor Configuration – S10 (J10-7) sensor [S5 (J8-11) sensor
for Lx500-800 models
]
Outdoor Sensor (Optional)
– wire the outdoor sensor to
SENSOR COM
and
OD SENSOR (OD / SYS SENSOR
for Lx500-800 models) of any one of the boilers in the cascade (for Lx500-800 models, outdoor sensor must
be connected to a non-Master boiler); see
Field Wiring
Tables 12-2(a) and 12-2(b) and Figure 12-2. Note:
only one outdoor sensor is needed for the multiple boiler system.
Modbus Address –
assign a unique
MB2 Modbus Address
to each boiler in the cascade. Access the
MB2
Modbus Address
setting via the
System Identification & Access
menu as follows:
Configure
– System Identification & Access – MB2 Modbus Address
Master Enable
– choose
one
(and only one) boiler in the cascade to be the Master, this boiler will receive all
control wiring and will be used for setting control parameters (see steps below). On this one boiler, set
Master
enable
equal to
Enabled
via the
Lead Lag Master Configuration
menu, accessed as follows:
Configure
– Lead Lag Master Configuration – Master enable
Table 11-1
Minimum Pipe Sizes for Multiple Boiler Applications
# of
Units
Lx150/150E
Lx200
Lx300
Lx400
Lx500
Lx600
Lx700
Lx800
2
1-1/2"
2"
2”
2-1/2"
2-1/2”
3”
3”
3"
3
2"
2"
2-1/2”
3"
3”
3”
4”
4"
4
2"
2-1/2"
2-1/2”
3"
4”
4”
4”
4"
5
2-1/2"
2-1/2"
3”
4"
4”
4”
4”
5"
6
2-1/2"
3"
3”
4"
4”
4”
5”
5"
7
2-1/2"
3"
4”
4"
4”
5”
5”
5"
8
2-1/2"
3"
4”
4"
5”
5”
5”
5"
Содержание Trinity Lx 150
Страница 61: ...Lx Series Installation and Operation Instructions Trinity Lx 61 Figure 13 1 b Ladder Logic Diagram Lx150 400...
Страница 62: ...Trinity Lx Installation and Operation Instructions Lx Series 62 Figure 13 2 a Connection Diagram Lx500 800...
Страница 63: ...Lx Series Installation and Operation Instructions Trinity Lx 63 Figure 13 2 b Ladder Logic Diagram Lx500 800...
Страница 103: ...Lx Series Installation and Operation Instructions Trinity Lx 103 NOTES...
