11
The boiler, when installed, 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 I, CSA C22.1,
Electrical Code.
!
WARNING
Electrical shock hazard. Turn OFF electrical
power supply at service panel before making
electrical connections. Failure to do so could
result in death or serious injury.
Component And Wire Coding Keys
• The keys that follow pertain to the HOT WATER
CONTROL AND HOT SURFACE PILOT WIRING FOR
SEALED COMBUSTION SERIES (diagrams on following
page).
• 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.
COMPONENT KEY
CODING
Thermostat (24 Volt)
TH-2
Transformer (120V/24V 40VA)
TR-1
Transformer (120V/24V 40VA)
TR-2
24 Volt Gas Valve
SV9501H
Pressure Switch
PS
Control Terminal
Relay Coil
1K
Relay Contacts
1K1
Relay Contacts
1K2
Limit Switch
LS
Circulator
CIR
Wire Connection
Not all components listed are used in all control
systems.
WIRING CODE KEY
LINE VOLTAGE BY FACTORY
LOW VOLTAGE BY FACTORY
LINE VOLTAGE BY INSTALLER
LOW VOLTAGE BY INSTALLER
THINGS TO AVOID WHEN
LOCATING THERMOSTATS
DEAD SPOTS:
Corners and alcoves
Behind doors
COLD SPOTS:
HOT SPOTS:
Concealed pipes or ducts
Concealed pipes
Fireplace or chimney
Stairwells - drafts
TV sets
Radios
Unheated rooms on
other side of wall
Lamps
Direct sunlight
Outside wall
Kitchens
ELECTRICAL WIRING
!
CAUTION
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation. Verify
proper operation after servicing.
Install Your Thermostat
• The thermostat location has an important effect on the
operation of your boiler system.
• BE SURE TO FOLLOW THE INSTRUCTIONS INCLUDED
WITH YOUR THERMOSTAT.
• Locate the thermostat about four feet (4’) above the
floor on an inside wall.
• Check thermostat operation by raising and lowering
thermostat setting as required to start and stop burners.
