UTICA BOILERS USC - Component Coding and Wiring Diagrams

FIGURE 9
PAGE 9
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) MGV MILLIVOLT GAS VALVE LGV 24 VOLT GAS VALVE LGV-1 24 VOLT GAS VALVE
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
PS PRESSURE SWITCH MR-PS MANUAL RESET PRESSURE SW. SD STACK DAMPER
CONTROL TERMINAL
1 K RELAY COIL 1 K1 RELAY CONTACTS 1 K2 RELAY CONTACTS LS LIMIT SWITCH
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
NOT ALL COMPONENTS LISTED ARE USED IN ALL CONTROL SYSTEMS
WIRING
LINE VOLTAGE BY FACTORY LOW VOLTAGE BY FACTORY LINE VOLTAGE BY INSTALLER LOW VOLTAGE BY INSTALLER
COMPONENT CODE
HOHO HOHO
HO
T T T T
T
WW WW
W
AA AA
A
TER CONTRTER CONTR TER CONTRTER CONTR
TER CONTR
OL OL OL OL
OL
AND HOAND HO AND HOAND HO
AND HO
T SURFT SURF T SURFT SURF
T SURF
AA AA
A
CE PILCE PIL CE PILCE PIL
CE PIL
OO OO
O
T T T T
T
WIRING FOR USC SERIESWIRING FOR USC SERIES WIRING FOR USC SERIESWIRING FOR USC SERIES
WIRING FOR USC SERIES