Operating instructions

TH-2
T
WTV
Z
B
R
B1 B2
HARNESS
C1 C2
L1 L2
L8148E
VENT
DAMPER
CIR
120V
60HZ
SUPPLY
AQUAS TAT
RSW
SSW
LGV
TH
TR
L2
C2
CIR
C1
DAMPER
1K1
L1
TR
TH-2
TV
T
B2
1K
W
Z
1K2
R
LS
B
FUSE
B1
RSW SSW
LGV
TR TH
COMPONENT CODE
TH-1 THERMOSTAT (MILLIVOLT)
TH-2 THERMOSTAT (24 VOLD)
TH-3 THERMOSTAT (LINE VOLTAGE)
TR-1 TRANSFORMER (120V/24V 40VA)
TR-2 TRANSFORMER (120V/24V 50VA)
MGV MILLIVOLT GAS VALVE
LGV 24 VOLT GAS VALVE
LGV-1 24 VOLT GAS VALVE
PS PRESSURE SWITCH
MR-PS MANUAL RESET PRESSURE SW.
SD STACK DAMPER
CONTROL TERMINAL
1K RELAY COIL
1K1 RELAY CONTACTS
1K2 RELAY CONTACTS
LS LIMIT SWITCH
MS MANUAL SWITCH
CIR CIRCULATOR
ECO ENERGY CUT-OFF
LWCO LOW WATER CUT-OFF
EWF ELECTRIC WATER FEEDER
PG POWER GENERATOR
PSC PILOT SAFETY COIL
WIRE CONNECTION
NOT ALL COMPONENTS LISTED ARE
USED IN ALL CONTROL SYSTEMS
LINE VOLTAGE BY FACTORY
LOW VOLTAGE BY FACTORY
LINE VOLTAGE BY INSTALLER
LOW VOLTAGE BY INSTALLER
WIRING
NOTES: 1) SWITCHES ARE SHOWN IN POSITION TAKEN DURING THE HEATING CYCLE.
2) 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.
1275086
A03107
NOTE: If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 105°C thermoplastic
wire or its equivalent.
Fig. 10—Wiring Diagram for Hot Water Boilers with Standing Pilot
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