UTICA BOILERS UBSSC-299 Installation, Operation & Maintenance Manual page 70

14.4 Schematic Diagram of Ladder Form - 150/200/299 MBH
LADDER DIAGRAM
150/200/299
L
LWCO
RETURN
DHW
FLUE
POWER
GAS VALVE WIRING FOR
150 / 200 MBH BOILERS
J13-3
J13-4
14 - WIRING DIAGRAM
4 3
J16-1
J16-4
J16-5
J16-8
J16-6
J16-7
J16-3
J16-2
J5-9
CH
THERMOSTAT
J5-1
J5-10
USER
DISPLAY
INTERFACE
J5-2
4 2
J5-11
SUPPLY
SENSOR
J5-3
J5-12
SENSOR
J5-4
J5-13
THERMOSTAT
J5-5
J5-14
SENSOR
J5-6
SYSTEM
J5-15
SENSOR
J5-7
(OPTIONAL)
J5-16
OUTDOOR
SENSOR
J5-8
ON
ARGUS LINK
S4
OFF
ARGUS LINK /
J18-1
MULTI BOILER
J18-2
(OPTIONAL)
GAS VALVE
G
J12
ARGUS
CONTROL
J13-2
BURNER
T2
PE
J9-1
DC+/L
J9-2
+
J9-6
J9-7 DATA/PWM
HALL
J9-5
GND
J9-4
DC-/N
J9-3
1
J13-1
J13-5
J13-6
J13-3
J13-4
DHW PUMP
RELAY 120VAC
L
J6-1
N
J6-3
L
J6-2
CH PUMP
RELAY 120VAC
L
J7-4
N
J7-2
J7-1
J7-3
L
J4-1
J4-2
J4-3
J4-4
G
J2-1
N
J2-2
L
J2-3
J2-4
120V / 24V, 15VA
TRANSFORMER
LWCO
24 VAC
1 2
70
N
GROUND
FLAME SENSOR
IGNITION
FAN
120VAC
3
LIMIT
HEAT EXCHANGER
TEMPERATURE SWITCH
GAS VALVE
G
L
N
G
L
L
PRIMARY PUMP
RELAY 120 VAC
PRIMARY
PUMP 120 VAC
L G
N
G
PN 240011320 Rev. G 10/01/2021]