A.O. Smith SGS - 28 Electrical diagram SGS, Components controller, Connections main controller

SGS

Electrical diagram SGS 80-100

Components controller

AControl

BIonisation rod

CGlow ignitor

DGas control

EBurner earth connection

F Program controlled pump

GContinuous pump

HExtra error signal

JIsolating transformer

KDouble-pole mains switch

LON / OFF switch control

MDisplay

NFan

OTemperature sensor

(T2 - bottom of tank)

P Dummy

QTemperature sensor (T1 - top of tank)

R Selection resistor S Pressure switch T Potentiostat

U Frequency controller V RS-485 interface

WElectric anodes

XSignaling for electric anodes

YMains choke and EMC-filter

Z Solar control system (BUS-link)

F1 Fuse

F3 Fuse

Connections main controller

1	X5	BUS-link
2	X6
3	L5	Potentiostat
4	N
5
6	L4	Frequency controller
7	N
8	X3	External ON / OFF
9	X4
10	N
11	L3	Program controlled pump
12
13	X1
14	X2	Extra error signal
15
16	N	Isolating transformer
17	L2
		(primary side)
18
19	N	Isolating transformer
20	L1
		(secundary side)
21
22
23	L	Power supply
24	N

Components solar controller

AAControl

BBPump solar system (ON / OFF)

CCPump solar system (modulating)

DDTemperature sensor (S1 - solarcollector)

EETemperature sensor (S2 - tank)

FFQ/T-measuring (incl. temperature sensor S4 - return solar collector)

GGControl (BUS-link)

HHTemperature sensor (S3 - top tank)

F2 Fuse

Connections solar controller

1
2	L	Power supply
3	N
4	-	n.a
5	-	n.a
6	-	n.a
7		Pump solar system
8	L1
		(ON / OFF)
9	N
10	N
11	L2	Pump solar system
12	-	(modulating)
13
14	-	n.a
15	-	n.a
16	-	n.a
17	-	n.a
18	-	n.a
19	-	n.a
20	-	n.a
	1	n.a
J3	2	n.a
	3	n.a
	4	n.a
	1	Power supply 5V
	2	Sensor return
J12		solar collector (S4)
	3	Earth
	4	Flow signal
	1	n.a
J13	2	Sensor solar collector (S1)
	3	n.a
	4	Sensor solar collector (S1)
	1	Sensor top tank (S3)
J14	2	Sensor tank (S2)
	3	Sensor top tank (S3)
	4	Sensor tank (S2)
J15	1	n.a
	2	n.a
J16	1	BUS-link
	2
	1	n.a
J17	2	n.a
	3	n.a