LAARS S8Ext - Installation Manual - Manual (Page 32)

Page 32 LAARS Heating Systems
MULTIPLE BOILERS WITH PUMPS
PIPING DIAGRAM
Outdoor
Sensor
System
Sensor
120VAC
Boiler 1 Boiler 2 Boiler 3 Boiler 4
Building Heating Loop
SQ-Elite
SYSTEM
DHW PUMP
INPUT RATINGS:
115VAC 60Hz, 12VA MAX
Use Copper Conductors Only.
CAUTION: Risk of Electric Shock.
PWR
L N
1 2
SENSORS MUST BE GOLD SERIES
SYSTEM
3
DHW PUMP
5
Stage A
7
Stage B
9
Stage C
11 13
Stage E
15
Stage F
17
Stage D
6 8 10 12 14 16 18
RS485
SYS= 144 F OD= 35 F
DE GH JK
HI LO -- OFF
4
Stage G
19
Stage H
21
OUTDOOR TEMP 27 29 31
DHW
33
SHUTDOWN /SETBACK 35
RETURN TEMP 20 22 28 30 32 34 36
STAGE MENU
Stage E
Stage F
Stage G
Stage H
Stage A
Stage B
Stage C
Stage D
25 26
PRESS + - 37 38
PROVE
SYSTEM
TEMP
PROGRAM RUN
23 24
COMB. AIR
DO NOT APPLY ANY VOLTAGE TO INPUT TERMINALS
COMB. AIR
ENCLOSED ENERGY MANAGEMENT EQUIPMENT LISTED 99RA
C US
System
Pump
S8
SEQUENCING CONTROL
System:
The S8 sequencing 4 single-stage boilers and their boiler pumps. The boilers are piped in Reverse Return on the primary
loop. The System output is controlling the System Pump.
Laars Heating Systems is aware that each installation is unique. Thus, Laars Heating Systems is not responsible for any
installation related to any electrical or plumbing diagram generated by Laars Heating Systems. The provided illustrations
are to demonstrate Laars Heating Systems’s control operating concept only.