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ELECTRICAL WIRING
Electrical wiring must conform with National Electrical Code, ANSI/NFPA No. 70 when
installed in the United States, the CSA C22.1 Canadian Electrical Code, Part 1, when
installed in Canada, and/or the local authority having jurisdiction. A separate electrical
circuit should be run from the entry box with a fused disconnect switch in this circuit. See
wiring diagram’s in figures 15 below, & 16, page 12, for suggested circuitry and field wiring.
Wiring for zone valve installations are furnished with zone valve packages.
1. 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
2. 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.
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
FIGURE 15
WIRING DIAGRAM FOR OIL FIRED BOILERS WITH A CIRCULATOR ZONE SYSTEM
LESS TANKLESS HEATER W/R8404 INTERRUPTED IGNITION
