1-25
INSTALLATION
SL 30-175, SL 45-260 MODULATING GAS BOILERS
CB
Input to Processor
Input to Processor
ELECTRICAL LADDER DIAGRAM
SL 20-115, 30-175, 45-260
Load 1 Contacts
Outdoor Sensor
Auxiliary Interlock (L.W.C.O., Air Proving, etc.) - Jumper if not used
Load 2 Contacts
Load 3 Contacts
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
Boiler Pump
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
CB
Auxiliary Interlock (L.W.C.O., Air Proving, etc.) - Jumper if not used
Indoor Sensor
Secondary Loop Sensor
Domestic Hot Water Sensor
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
To/From other IBC Boilers (must be twisted pair wire)
Input from external controls (by others, 4-20 mA or 0-10VDC only)
NOTE: All
sensors are
optional based
on the specific
application.
Fuse - 5A
Fuse - 5A
Fuse - 5A
Fuse - 5A
G1
Load Pump 1
Load Pump 2
Load Pump 3
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
SL 20-115, 30-175, 45-260 Ladder Diagram
1.8.6 Thermostat Heat Anticipator
iBC “therm.” contacts draw no power, so an anticipator setting for the thermostat
is not applicable with the sl modulating series boilers. in the case of a single
temperature / heat load where zone valves are used to manage individual
thermostatically controlled zones, each room thermostat’s heat anticipator should
be adjusted to the current draw of its associated zone valve.
Figure 30: Electrical Wiring Connections (full page ladder diagram at back of this manual)
Summary of Contents for SL 30-175
Page 76: ...NOTES...