INSTALLATION AND OPERATION INSTRUCTIONS
16
IBC INDIRECT WATER HEATERS - ALL MODELS
ELECTRICAL LADDER DIAGRAM
2 Load Parallel Piping/w 24 Vac Zone Valves
Refer to Mechanical Drawing #4
Valid for all IBC Boilers except the SL 80-399 - refer to SL 80-399 I&O Manual
IB
C
CB
Input to Processo
rI
nput to Processo
r
DO NOT connect ANYTHING
to these terminals
Auxiliary Interlock
Fan Coil Thermostat
Interlock 1
Therm. 1
Interlock 2
Therm. 2
Therm. 3
Outdoor S.
Indoor S.
2nd Loop S.
DHW S.
Boiler Net +
Ext. Cont. –
G
120Vac
L
N
IBC Control Board
CB-1
Yellow
White
CB-2
CB-3
CB-4
P/ V Power - R
P/ V Power - C
P/ V3 - C
P/ V3 - R
P/ V1 - C
P/ V1 - R
P/ V2 - C
P/ V2 - R
IBC
CB
Domestic Hot Water Sensor
Supplied with IBC Water Heater
Interlock 1
Interlock 2
Therm. 1
Therm. 2
Therm. 3
Outdoor S.
Indoor S.
2nd Loop S.
DHW S.
Boiler Net –
Ext. Cont. +
White
Green
Black
Fuse - 5A
Fuse - 5A
Fuse - 5A
Fuse - 5A
G1
G2
G3
G4
G5
G6
G7
G8
O1
O2
O3
O4
O5
O6
O7
O8
O9
O10
O11
O12
O13
O14
O15
O16
O17
O18
O19
O20
O21
O22
Auxiliary Interlock
Outdoor Sensor
Supplied with IBC Boiler
Boiler Pump
(P1)
Tr
ansformer
120 Vac
24 Vac
White
R
C
N
L
WHEN THE GREEN TERMINAL
BLOCK
IS WIRED UP
FOR 24V
ac, DO NOT
CONNECT
ANY
120V
ac LOADS
DHW Zone
Valve
(ZV1)
Fan Coil
Zone Valve
(ZV2)
ZV
ZV
DHW
FAN COIL
2 Load Parallel Piping/w Zone Valves
Domestic Hot Water Sensor
DHW Zone Valve
(ZV1)
Outdoor Sensor
Fan Coil Thermostat
Mechanical Drawing #4
Fan Coil
Zone Valve
(ZV2)
IBC
BOILER
IBC
Boiler
Pump
(P1)
NOTE
When using zone valves in a
multi-zone heating system,
careful consideration must
be taken to ensure that flow
rates do not decrease below
the boiler’s rated minimum
flow requirement. Bypass
arrangements (pressure
activated bypass, three way
valves, etc.) may be required
to ensure adequate flow
under low load conditions.
