Modulating piping diagram, System, Four modulating boilers – LAARS M4-LHS - Installation Manual User Manual
Page 50: M4-lhs installation and operation manual, Ma gnd vlt, Gnd vlt, Ma temp outdoor o o temp system extension module, Prove /dhw shutdown /setback /tstat
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M4-LHS Installation and Operation Manual
SYSTEM
A
B
C
D
1 2
RUN
PROGRAM
DO NOT APPLY ANY VOLTAGE
TO INPUT TERMINALS
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RS-485
mA
GND
VLT
SYS
A
B
C
D
PWR
CUR / VLT
A
-
+
+
mA
GND
VLT
-
+
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mA
GND
VLT
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mA
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GND
VLT
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mA
TEMP
OUTDOOR
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O
TEMP
SYSTEM
EXTENSION
MODULE
CUR / VLT
B
CUR / VLT
C
CUR / VLT
D
PROVE
/DHW
SHUTDOWN
/SETBACK
/TSTAT
M4-LHS
HYBRID CONTROL
System
Sensor
120VAC
Building Heating Loop
Outdoor
Sensor
MODULATING PIPING DIAGRAM
System:
The M4-LHS operates four modulating boilers. The boilers are piped in Reverse Return on the primary loop. The System
output is controlling the System Pump.
Laars is aware that each installation is unique. Thus, Laars is not responsible for any installation related to any electrical
or plumbing diagram generated by Laars . The provided illustrations are to demonstrate Laars's control operating concept
only.
STARTUP SETTINGS
Boiler Type = Modulation
Boiler Number = 4
Four Modulating Boilers
Boiler 1
Condensing
Modulating
Boiler 2
Condensing
Modulating
Boiler 3
Condensing
Modulating
Boiler 4
Condensing
Modulating