RBI FUTERA XLF Series, Control Manual

Page: 59 / 128

OPTIONAL FEATURES HeatNet Control V3
Page 59
Local Pump Option
LOCAL PUMP/VALVE OPTION : This is a special
feature, when using valves, it prevents deadheading water
flow when all boilers are off. When this feature is enabled,
the Master boiler will enable its local valve when
NO boilers
are running. If boilers are running in LOCAL override and
not controlled by H-NET, but are visible to H-NET, the
valve(s) on these boilers are presumed OPEN. In this
situation, the Master
will not enable its valve unless it is
running.
Figure 46 Local & DHW Pump connections
Local Pump/Valve
Normally Closed &
Normally Open Contacts
DHW
Normally Closed &
Normally Open Contacts
Another feature of the PUMP/VALVE OPTION is to control
a local (primary) pump using a Variable Frequency Drive.
This feature may be required when a secondary system pump
is also variable speed. To enable this feature
: SETUP:
PUMP OPTIONS: LOCAL PUMP PUMP/VALVE
OPTION: LOCAL PUMP VFD: ON
. Setting this Option to
ON will map the control signal on J4 pins 1+ and 5- to the
modulation rate. 2 wires need to be run from J4.1+ and J4.5-
to the VFD’s input connection. Ensure that the JS1 shunt
jumper on the control board is in position 0-10 or 4-20mA as
required.
Auxiliary Function Options
Combustion Air Damper
Relay K5 and the terminal J13 DAMPER is used to control a
combustion air damper. J12B.7 & .8 are used to detect the
dry contact proof switch from the damper. J12B.7 is the
sense input and J12B.8 is 24VAC. A proof time of up to 4
minutes can be set before the boiler can start or an alarm
condition will occur. The Combustion Damper can be setup
in the
SETUP: AUX FUNCTIONS menu.
Using the LINKED/COMMON setting, the Master boiler
controls a system damper, so in the event this damper fails to
open, the system will not start. If the Master boiler’s system
damper fails, then no call for heat will be made to the
Member boiler(s).
Using the INDEPENDENT setting, each Member boiler can
control its own damper and is independent of the Master
boiler when a call for heat is made to the Member. This
allows for separate dampers for each boiler. They can be
wired to J12B terminals 7 and 8.
If a common system damper is used (controlled by the
Master boiler), each individual boiler must prove that the
combustion air damper is open when it is placed in LOCAL.
This may be done using J12B terminal 7 on all boilers wired
to the damper’s prove switch. Terminal 7 is the sense input
and terminal 8 is 24 VAC. Connecting a wire to terminal 8 is
not recommended.
See Figure 60, Common system damper wiring , Page 76.
A separate/independent 24 VAC source is
recommended to be used for the damper prove
switch when a common system damper is
used. If you use terminal 8 to supply power
from the Master and the Master is powered
OFF, no boiler will be allowed to fire due to
the loss of power through the prove switch. A
backup boiler will also need to have the
damper relay contacts wired in parallel with
the Master for when the Master is powered
OFF.
A second wire on the Master J12B terminal 7 is then
connected. The other end of this wire is then run to the first
Member boiler J12B terminal 7. If another Member boiler is
present, a second wire can be connected to the first Member
boiler J12B terminal 7 and the other end connected to the
other boiler J12 terminal 7. This method can be continued if
additional boilers are present. This input must be selected in
the
SETUP: AUX FUNCTIONS: COMBUST AIR
DAMPER menu.