12
Electrical wiring must conform with National Electrical
Code ANSI/NFPA No. 70 in United States and CSA C22.1
Canadian Electrical Code in Canada and/or the local
authority having jurisdiction.
Separate electrical circuit should be run from entry
•
box with fused disconnect switch in this circuit.
See wiring diagrams in
•
Figures 12 & 13, for
suggested circuitry and field wiring see Normal
Sequence of Operation in this manual.
Wiring for zone valve installations are furnished with
•
zone valve packages.
Wiring Code
LINE VOLTAGE BY FACTORY
LOW VOLTAGE BY FACTORY
LINE VOLTAGE BY INSTALLER
LOW VOLTAGE BY INSTALLER
* Not all components listed are used in all control
systems.
Component Coding
TH-1 Thermostat (millivolt)
TH-2
Thermostat (24 Volt)
TH-3
Thermostat (Line Voltage)
TR-1
Transformer (120V/24V 40VA)
TR-2
Transformer (120V/24V 50VA)
LGV
24 Volt Gas Valve
PS
Pressure Switch
MR-PS Manual Reset Pressure Sw.
Control Terminal
1K
Relay Coil
1K1
Relay Contacts
1K2
Relay Contacts
LS
Limit Switch
MS
Manual Switch
CIR
Circulator
ECO
Energy Cut-Off
PSC
Pilot Safety Coil
Wire Connection
LWCO Low Water Cut Off
EWF
Electric Water Feeder
PG
Power Generator
ELECtRICAL WIRINg
Figure 12 - Wiring Diagram For Oil Fired Boilers Less Tankless Heater
