Operation; Standing Pilot Boilers; Schematic Wiring Diagram - Weil-McLain GOLD CGa Installation And Maintenance Manual

GOLD
8a
Operation —
Follow all procedures given in this manual and lighting
instructions when operating the boiler. Failure to do so
could result in severe personal injury, death or
substantial property damage.
1. After pilot is manually lit, the gas valve provides pilot
Standby mode:
gas and maintains pilot as long as the thermocouple is satisfied. If
thermocouple signal drops for any reason, pilot must be manually
lighted, following the
Lighting Instructions
boiler. Vent damper will remain closed.
2. When thermostat circuit closes, the boiler circulator and
Call for heat:
vent damper are energized. The vent damper drives open. When the
vent damper is fully open, its end switch energizes the main gas valve.
Figure 23 Wiring diagram — Standing pilot system

SCHEMATIC WIRING DIAGRAM

ADDITIONAL
LIMITS
(NOTE 6)
EQUIPMENT
GROUND
BK
(NOTE 7)
BK BK
Y W
SERVICE
SWITCH
G
G
(BY OTHERS)
H
C
BK
BK
120/24 V.A.C.
N
W
Y
Y
W
CIRCULATOR
JUNCTION BOX
WIRE NUT
ELECTRICAL SHOCK HAZARD, CAN CAUSE SEVERE
INJURY OR DEATH. DISCONNECT POWER
BEFORE INSTALLING AND/OR SERVICING.
NOTES:
1. ALL WIRING MUST BE INSTALLED IN ACCORDANCE WITH:
A. U.S.A. - NATIONAL ELECTRICAL CODE AND ANY OTHER NATIONAL, STATE OR LOCAL
CODE REQUIREMENTS.
B. CANADA - C.S.A. C22.1 CANADIAN ELECTRICAL CODE PART 1 AND ANY OTHER
NATIONAL, PROVINCIAL OR LOCAL CODE REQUIREMENTS.
2. ALL CONTACTS SHOWN WITHOUT POWER APPLIED-OFF SHELF CONDITION.
3. IF ORIGINAL ROLLOUT TFE WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED,
o
TYPE 200 C WIRE OR ITS EQUIVALENT MUST BE USED. IF OTHER ORIGINAL WIRE AS
SUPPLIED WITH THE APPLIANCE MUST BE REPLACED, TYPE 105 C OR ITS EQUIVALENT MUST
BE USED.
4. REFER TO CONTROL COMPONENT INSTRUCTIONS PACKED WITH BOILER FOR APPLICATION INFORMATION.
5. THERMOSTAT - FOR SINGLE ZONE SYSTEMS, THERMOSTAT ANTICIPATOR SETTING IS 0.40 AMPS.
FOR MULTIPLE ZONE SYSTEMS USING ZONE VALVES OR CIRCULATORS, REFER
TO COMPONENT MANUFACTURER'S INSTRUCTIONS FOR
APPLICATION WIRING AND THERMOSTAT ANTICIPATOR SETTING.
EMCS - FOR EMCS CONNECTION IN PLACE OF THERMOSTAT, REFER TO
EMCS INSTALLATION/OPERATING MANUAL.
6. L.W.C.O., ADDITIONAL HIGH LIMIT, ETC., WIRED IN SERIES.
7. DENOTES FIELD INSTALLED CHASSIS GROUND.
34
CGa Gas-Fired Water Boiler

standing pilot boilers

in this manual and on
SPILL LIMIT
SWITCH CONTROL
BK BK
Y
THERMOSTAT
OR EMCS
ROLLOUT
(NOTE 5)
TFE
Y
G
R
BK
TRANSFORMER
BL
PLUG-IN
THERMO-
DPST
COUPLE
RELAY
PILOT
o
This provides gas to the main burners. Burners
remain ignited until thermostat circuit or limit
circuit opens. Burners and circulator are deenergized
when call for heat stops. Burners are deenergized,
but circulator remains on, if the limit circuit opens.
3.
Limit operation:
main gas valve is deenergized, but circulator
continues to run. When the limit circuit closes again,
the main gas valve is energized if there is still a call
for heat.
4.
Thermostat heat anticipator:
as shown on wiring diagram,
LADDER WIRING DIAGRAM
H
CABLE
TO
DAMPER
SERVICE SWITCH
(BY OTHERS)
DAMPER
CONNECTOR
R
THERMOSTAT
OR EMCS
(NOTE 5)
BL
GAS
VALVE
CR1
ADDITIONAL
LIMITS SPILL
(NOTE 6) SWITCH
Y
LOW VOLTAGE FIELD
HIGH VOLTAGE FIELD
LOW VOLTAGE FACTORY
HIGH VOLTAGE FACTORY
THERMOCOUPLE
CGa
Standing Pilot
Natural Or Propane Gas
25 thru 8
Forced Hot Water
When a limit control opens, the
Set heat anticipator
Figure 23
120 V.A.C.
CIRCULATOR
CR2
PRIMARY
24 V.A.C.
RELAY COIL
CR
G
CABLE
TO
DAMPER
1 6 3 5 2 4
6 3 5
1 2 4
DAMPER
CONNECTOR
FUSE
LIMIT
ROLLOUT
CONTROL
TFE
GAS
VALVE
THERMOCOUPLE
A United Dominion Company
Weil-McLain 500 Blaine St. Michigan City, IN 46360-2388
550-225-009/0999
PART NUMBER
Part Number 550-110-593/1099
.
N
EQUIPMENT
GROUND
(NOTE 7)
C