1-21
INSTALLATION
SL 30-175, SL 45-260 MODULATING GAS BOILERS
each boiler will control its own pump, turning it off or on when heat is required.
this approach saves electricity by reducing the pumping power required as load
conditions are reduced. Check valves are to be used in each boilers piping to
prevent reverse flow when the boiler is off.
one boiler control is set up as a “Master” boiler, and up to 23 additional boilers
can be added to the system as “subordinate” boilers by connecting a twisted pair
of wires between the boilers. no additional controls are needed.
NOTE
When using the sequential
load feature of the IBC boiler,
attention must be paid to
the operation of system
components in order to
ensure they are compatible.
Many air handlers (fan
coils) for instance have a
thermostat connection that
will energize an internal relay
to operate the air handler
circulator and its fan on
a call for heat. This may
result in operation of these
components when other
loads are running at a higher
priority, resulting in cold air
blowing, or robbing heat from
another load.
Some wiring alteration may
be required to divorce both
of these functions from
thermostat control in favour
of more effective control from
the IBC boiler.
Figure 27: Trim options for multiple boiler installations
Figure 28: Multiple boiler inter-wiring
CIRCUIT BOARD JUMPER REMOVAL
FOR NETWORKED MULTIPLE BOILERS
Boiler #1
(Master)
Boiler #2
(Subordinate)
Boiler #3
(Subordinate)
Boiler #4
(Subordinate)
Boiler #5
(Subordinate)
Boiler #6
(Subordinate)
TWISTED
PAIR WIRING
CONNECTIONS
REMOVE JUMPERS FROM THE
INTERMEDIATE BOILERS
DO NOT REMOVE JUMPER
ON END BOILERS
DO NOT REMOVE JUMPER
ON END BOILERS
IBC
SL 30-175
SL 45-260
BOILER
IBC
IBC
SL 30-175
SL 45-260
BOILER
IBC
IBC
SL 30-175
SL 45-260
BOILER
IBC
IBC
SL 30-175
SL 45-260
BOILER
IBC
IBC
SL 30-175
SL 45-260
BOILER
IBC
IBC
SL 30-175
SL 45-260
BOILER
IBC
NOTE
For further information and
details regarding Multiple
Boiler application, consult
our Technical Notes - Multiple
Boiler Systems. These notes
provide necessary detail on
specific single and multiple
boiler applications “Piping”,
“Wiring” and “Settings”.
(available at www.ibcboiler.
com or from your IBC
Representative).
Figure 26: Jumper removal
MULTI BOILER TRIM OPTIONS
IMPORTANT NOTE: NONE OF THE EXTERNAL DEVICES SHOWN ON THIS
DRAWING ARE SUPPLIED BY IBC AS STANDARD EQUIPMENT EXCEPT FOR
THE PRESSURE RELIEF VALVE. THE OTHER DEVICES CAN BE PROVIDED BY
YOUR IBC DISTRIBUTOR OR BY SPECIAL ORDER FROM IBC
CONNECT TO
RETURN MANIFOLD
FLOW
DIRECTION
NOTE: BOILER PUMP MAY
BE INSTALLED ON EITHER
THE SUPPLY OR RETURN -
REFER TO ENGINEER’S
DRAWINGS FOR
PREFERRED LOCATION
DRAIN WITH CAP
OPTIONAL EXTERNAL
WATER HIGH LIMIT (MANUAL
RESET)
THE IBC SL 30-175 or SL
45-260 CAN BE FITTED WITH
AN EXTERNAL MANUAL
RESET MECHANICAL WATER
TEMPERATURE HIGH LIMIT IF
REQUIRED BY LOCAL
JURISDICTION -
SUPPLIED BY
OTHERS
CONNECT TO
SUPPLY MANIFOLD
PRESSURE RELIEF
VALVE SUPPLIED
BY IBC
AUTO AIR VENT
WITH ISOLATION
VALVE
PIPE TO
DRAIN
FLOW
DIRECTION
OPTIONAL EXTERNAL
TRIDICATOR GAUGE
THE IBC SL 30-175 or
SL 45-260 CAN BE FITTED
WITH A BOILER
TRIDICATOR IF REQUIRED
BY LOCAL JURISDICTION -
SUPPLIED BY OTHERS
OPTIONAL LOW WATER CUT-OFF
THE IBC SL 30-175 or SL 45-260 CAN
BE ORDERED WITH AN INTERNAL
FACTORY SUPPLIED AND
INSTALLED UL 353 APPROVED
MANUAL RESET LOW WATER
CUT-OFF (LWCO). THIS SAME LWCO
CAN BE FIELD INSTALLED USING
THE IBC (LWCO) KIT
- ORDER IBC
PART #P-156A.
IN RARE INSTANCES, AN EXTERNAL
DEVICE
MAY BE REQUIRED BY
LOCAL JURISDICTION - THESE
DEVICES HAVE SPECIFIC
INSTALLATION REQUIREMENTS NOT
ILLUSTRATED HERE - CONSULT
WITH THE IBC FACTORY FOR
PROPER APPLICATION OF THESE
DEVICES WHEN REQUIRED
IBC
SL 30-175
SL 45-260
BOILER
IBC
Summary of Contents for SL 30-175
Page 76: ...NOTES...
