UTICA BOILERS UB90125 Installation, Operation And Maintanance Manual page 19

notE: If any of the original wire as supplied with this appliance must be replaced, it must be replaced with type 150°C
P7-1
P4-1
2K1
P10-1
1K1
P5-1
5K1
P6-1 P12-1
P1-1
P2-1
CASTING TEMPERATURE
SAFETY SWITCH
(MANUAL RESET)
DIFFERENTIAL
AIR PRESSURE
SWITCH (N.O.)
SET AT
+ 0.5" WC
P3-9
P3-7
R
W
THERMOSTAT
X. electrical wiriNg
Figure #14B
laddER WIRIng dIagRaM
Thermoplastic wire or its equivalent.
(NOTE: USE COPPER CONDUCTORS ONLY)
L1
HOT
ON/OFF
SWITCH
LWCO
(PS-122)
CIRCULATOR FIELD WIRED
BLOWER
HOT SURFACE IGNITER
4K1 3K1
P3-1
1
3
2
1
P3-3
P3-6
HIGH LIMIT
AQUASTAT
CONTROL
P3-4
120 VOLT POWER SUPPLY
L2
BLK WHT
P12-2
120 VAC
3 1
TRANSFORMER
4
5
24 VAC
GAS VALVE
P3-5
MICROPROCESSOR
ELECTRONIC
LOGIC & TIMERS
INDICATOR LIGHTS
POWER
PURGE
IGNITER
VALVE
FLAME
1013-10 CONTROL
P1-2
19
P7-3
P4-3
P10-2 P5-3
P10-3
P6-2
5K2
P1-3
P2-2
P3-2
5K
4K
3K
2K
1K
P7-2