Power Supply - UTICA BOILERS UB90-50 Installation Manual

Figure 15 - E - Ladder Wiring Diagram
R
THERMOSTAT
ON/OFF SWITCH
P7-1
P4-1
2K1
P10-1
1K1
P5-1
DRAFT INDUCER
5K1 P6-1
P2-1
CASTING TEMPERATURE
SAFETY SWITCH
(MANUAL RESET)
4K1 3K1
P3-1
1
3
DIFFERENTIAL AIR
2
PRESSURE SWITCH
1
P3-3
P3-6
HIGH LIMIT
P3-9
AQUASTAT
CONTROL
BLOWER
TEMPERATURE
SAFETY SWITCH
P3-7
P3-4
W
ELECTRICAL WIRING
120 VOLT

POWER SUPPLY

L1
L2
HOT
BLK WHT
*
CIRCULATOR MOTOR
HOT SURFACE IGNITER
P12-1 P12-2 P6-2
120
P1-3
VAC
3 1
P1-1
TRANSFORMER
24
4 5
VAC
P2-2
GAS VALVE
VR8205A
MV
P3-5
P9-3
MICROPROCESSOR
ELECTRONIC
LOGIC & TIMERS
INDICATOR
POWER
PURGE
IGNITER
VALVE
FLAME
1013-10 CONTROL
1
POWER SUPPLY. PROVIDE
DISCONNECT MEANS AND
OVERLOAD PROTECTION AS
REQUIRED USE ONLY COPPER
WIRE BETWEEN DISCONNECT
AND THE UNIT
NOTE: "P" LABEL REFERENCE
LOCATION OF CONNECTOR PLUG
BETWEEN SCHEMATIC AND
LADDER DIAGRAM
*
CAUTION: RECEPTACLE IS LIVE WHEN
BOILER SWITCH IS OFF
REFERENCES PLUG CONNECTION
34
1
P7-3
P4-3
P5-3
P10-2
5K2
MV
P9-2 P3-2
5K
LIGHTS
4K
3K
2K
1K
P7-2