15
INSTALLATION AND OPERATION INSTRUCTIONS
IBC INDIRECT WATER HEATERS - ALL MODELS
ELECTRICAL LADDER DIAGRAM
2 Load Parallel Piping/w Pumps - Refer to Mechanical Drawings #2 & #3
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 - L
P/ V Power - N
P/ V3 - N
P/ V3 - L
P/ V1 - N
P/ V1 - L
P/ V2 - N
P/ V2 - L
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
DHW
Pump
(P1)
Fan Coil
Pump
(P2)
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
2 Load Parallel Piping/w Pumps
DHW
FAN COIL
Domestic Hot Water Sensor
DHW Pump
(P1)
Fan Coil Pump
(P2)
Outdoor Sensor
Fan Coil Thermostat
Mechanical Drawing #2
IBC
BOILER
IBC
2 Load Parallel - 2 Side Piping - SL 20-115 & Pumps Only
IBC
SL 20-115
BOILER
IBC
DHW
Domestic Hot Water Sensor
DHW Pump
(P1)
Fan Coil Pump
(P2)
Outdoor Sensor
Fan Coil Thermostat
Mechanical
Drawing #3
FAN COIL
NOTE
IBC VFC Series boilers
have been designed to take
advantages of the many
benefits of primary/secondary
piping. These models have a
software routine that utilizes
the boiler pump contacts on
start-up in order to prove
flow. The sketch below details
a wiring modification that
must be made when using
parallel pumping with IBC
VFC model Boilers.
Mechanical Drawing #3, immediately below,
is only applicable to the IBC model SL 20-115
ELECTRICAL LADDER DIAGRAM DETAIL
VFC Series Boiler Wiring for Parallel Piping
Valid for IBC VFC 15-150 and VFC 45-225 Model Boilers
G
120Vac
L
N
IBC Control Board
CB-1
Yellow
White
CB-2
CB-3
CB-4
P/ V Power - L
P/ V Power - N
P/ V3 - N
P/ V3 - L
P/ V1 - N
P/ V1 - L
P/ V2 - N
P/ V2 - L
IBC
CB
White
Green
Black
Fuse - 5A
Fuse - 5A
Fuse - 5A
Fuse - 5A
G1
DHW
Pump
(P1)
Heating
Pump
(P2)
G2
G3
G4
G5
G6
G7
G8
Connect Yellow and
White Primary Pump
wires to the bottom
two terminals on the
Green Terminal Strip
On a VFC Model boiler, locate the
Yellow and White pair of wires in the
wiring box behind the IBC Control.
Connect the Yellow wire to the “P/V
Power L” terminal second from the
bottom on the Green terminal plug.
Connect the White wire to the bottom
terminal labelled “P/V Power N”. This
will satisfy the boiler’s flow proving
routine when either zone starts up.
