Electrical Wiring - UTICA BOILERS SW3 Installation, Operation & Maintenance Manual

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
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.
Figure 12 - Wiring Diagram For Oil Fired Boilers Less Tankless Heater

ELECtRICAL WIRINg

Figures 12 & 13, for
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
12