Weil-McLain Comprehensive Boiler Wiring Diagram for EGH Models

Page 15

Part Number 550

SCHEMATIC WIRING DIAGRAM

-110-677/0299

	(NOTE 6)
MANUAL RESET		MANUAL RESET
PRESSURETROL		PROBE LWCO
PRESSURETROL	FLOAT LWCO
BK	BK	BK	BK
OPERATING

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	CONTROL
	GROUND
		(NOTE 9)
	(NOTE 7)
		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
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

15

Image 15

Contents Control Supplement Please read this page first Boiler cartons Carton guideGas train assembly InstallationVent damper assemblies Install optional vent damper if suppliedIII Install boiler controls water boilers II Piping connectionsWater boiler connections III Install boiler controls steam boilers IV Optional heaters steam boilers onlySteam 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,