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• When installed boiler must be electrically bonded to
ground in accordance with the requirements of the
authority having jurisdiction or, in the absence of such
requirements, with the National Electrical code, ANSI/
NFPA 70, and/or the Canadian Electrical Code Part 1,
CSA C22.1, Electrical Code.
• Install fused disconnect switch between boiler and meter
at convenient location.
COMPONENT AND Wire CODING Keys
The keys that follow pertain to the HOT WATER
CONTROL AND INTERMITTENT IGNITION WIRING
diagrams.
COMPONENT KEY
Thermostat (millivolt)
Thermostat (24 Volt)
Thermostat (Line Voltage)
Transformer (120V/24V 40VA)
Transformer (120V/24V 50VA)
24 Volt Gas Valve
24 Volt Gas Valve
Pressure Switch
Manual Reset Pressure Sw.
Control Terminal
Relay Coil
Relay Contacts
Relay Contacts
Limit Switch
Manual Switch
Circulator
Energy Cut-Off
Pilot Safety Coil
Wire Connection
Low Water Cut Off
Electric Water Feeder
Power Generator
Roll-Out Switch
ELECTRICAL WIRING
* Not all components listed are used in all control systems.
Hot water control and intermittent ignition wiring for boilers
with fail safe relay. See figure 26.
NOTES:
* Switches are shown in position during the heating
cycle.
* If any of the original wiring supplied with the boiler
is replaced it must be replaced with like wire size and
type of insulation or equivalent.
CODING
TH-1
TH-2
TH-3
TR-1
TR-2
LGV
LGV-1
PS
MR-PS
1K
1K1
1K2
LS
MS
CIR
ECO
PSC
LWCO
EWF
PG
RSW
30
WIRING CODE KEY
LINE VOLTAGE BY FACTORY
LOW VOLTAGE BY FACTORY
LINE VOLTAGE BY
INSTALLER
LOW VOLTAGE BY
INSTALLER
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