LAARS M4-LHS - Installation Manual - Manual (Page 53)

HT# 059295-00
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50
M4-LHS installation and Operation Manual
SYSTEM
A
B
C
D
1 2
RUN PROGRAM DO NOT APPLY ANY VOLTAGE TO INPUT TERMINALS
3 4 5 6 7 8 9 10 11 12 13 15 14 17 16 18 20 19 21 24 23 29 25 27 26 28 32 30 31
L N - + + T T O O RS-485 mA GND VLT
SYS A B C D PWR CUR / VLT A
- + + mA GND VLT - + + mA GND VLT + + mA
22 - GND VLT + mA TEMP OUTDOOR
O O
TEMP SYSTEM EXTENSION MODULE CUR / VLT B CUR / VLT C CUR / VLT D PROVE /DHW SHUTDOWN /SETBACK /TSTAT
M4-LHS
HYBRID CONTROL
Boiler 4
Non-Condensing
On/Off
System
Sensor
120VAC
Building Heating Loop
Boiler 1
Condensing
Modulating
Boiler 2 Boiler 3
Non-Condensing
On/Off
Condensing
Modulating
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