Weil-McLain EGH-125, EGH-105 manual Schematic Wiring Diagram

Page 19

Part Number 550-

SCHEMATIC WIRING DIAGRAM

110-677/0299

			(NOTE 6)
	MANUAL RESET				MANUAL RESET
	PRESSURETROL					PROBE LWCO
			FLOAT LWCO
PRESSURETROL			& PUMP
			CONTROL
	BK		BK				BK

IMPULSE

RELAY

R

R

MOMENTARY

SWITCH

R R

R

W

G

R

D

D

TH TR W

ROBERTSHAW GAS VALVE

W

BK

PILOT

SOLENOID

VALVE

BK W R

UNIVERSAL SPARK

IGNITION CONTROL

MV

MV/PV

EQUIPMENT	OPERATING		BK
GROUND	CONTROL
(NOTE 7)		(NOTE 9)
	Y	Y

Y

GR

R

R

PV

ALARM

ALARM

		BK		THERMOSTAT
		BK		OR EMCS
				OR EMCS		G
		BK	BK	(NOTE 5)		G
				(NOTE 5)

SERVICE		Y	W
SWITCH		Y	W
SWITCH	G	G
(BY OTHERS)						G
			G			G
H			G
H		C	R
	BK	C	R			BK
	BK		TRANSFORMER			BK
			TRANSFORMER
			120/24 V.A.C.			G
N						G
N
	W			PLUG-IN
				PLUG-IN
WIRE NUTS (2)				DPST
WIRE NUTS (2)				RELAY
				RELAY
		JUNCTION BOX			CABLE
					CABLE
					TO
					DAMPER

Y

R

G

R

1 2 A 1

Y
DAMPER	CONNECTOR

R

TERMINAL

BLOCK

A2

NOTE 10

PRE-WIRED PANEL

Y

24V

G

24V (GND)

SENSE

SPARK

W O

PILOT

(NOTE 8)

EGH-105 to EGH-125 Control Supplement

CSD-1 control system — Natural gas

19

Image 19

Contents Control Supplement Please read this page first Boiler cartons Carton guideGas train assembly InstallationVent damper assemblies Install optional vent damper if suppliedII Piping connections III Install boiler controls water boilersWater boiler connections IV Optional heaters steam boilers only III Install boiler controls steam boilersSteam boiler connections Gas piping VI WiringCall for heat VI Wiring sequence of operationWater boiler wiring Wiring water boilersSchematic Wiring Diagram Control assembly water boiler VI Wiring water boilersCSD-1 control panel Gravity return VI Wiring steamSchematic Wiring Diagram 13a Control assembly steam, gravity returnCSD-1 control panel Pumped return Schematic Wiring Diagram Control assembly steam, pumped return Terminal strip Before proceeding To place boiler in operation VII Final adjustmentsOperating instructions VII Final adjustments operating instructionsViii Check-out procedure operation Leak test procedure Viii Check-out procedure leak testVerify proper operation after servicing Viii Check-out procedure troubleshootingReplace pilot assembly TS-2 No Spark System boiler with vent damper does not work Not OK TS-3 Pilot lights Main valve will not come on from previous IX Service and maintenance Water boiler assembly Replacement parts water boilersRV20VL Water boiler replacement partsSteam boiler assembly Replacement parts steam boilersRV20VL Steam boiler replacement partsWeil-McLain Blaine Street Michigan City,