RBI FUTERA XLF Series, Руководство по управлению

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OPTIONAL FEATURES HeatNet Control V3
Page 57
setpoint is defined as 4mA SETPOINT and the upper setpoint
is defined as 20mA SETPOINT. The 4mA SETPOINT is
linked to the BOILER START x.xxmA where this starting
current is the lower setpoint. So, if we set the 4mA
SETPOINT to 130F and the 20mA SETPOINT at 180F we
will have established the band. Once a starting control
current of BOILER START 4.1mA is applied, and the 4-20
REMOTE ENABLE INPUT is closed, the boiler will start
and the setpoint will be set to 130F. If a control current of
10mA is applied the boiler will track on a linear slope
towards the 20mA SETPOINT settling at a SETPOINT of
~149F. As the current increases to 20mA, the SETPOINT
will indicate 180F. The Default setting is 4mA SETPOINT:
50F, and 20mA SETPOINT 220F for backwards
compatibility with the older version. NOTE: anytime a new
firmware version is uploaded to the control, these values
return these defaults.
Anytime a new firmware version is uploaded
to the control, these values return to these
defaults.
If using the direct modulation mode by applying a 4-20mA
current, only the BOILER START x.xxmA setting applies.
The 4-20 mA input can be set to HIGH PRIORITY. This is
done in menu:
ADVANCED SETUP: 4-20mA INPUT:
CHANNEL MODE . This allows a Member boiler to be
taken offline and directly modulated by an external control. If
the Master is using it for heating and the 4-20mA is set to
HIGH PRIORITY, an external control can now output a 4-
20mA signal which will take over the boiler’s fire rate. This
is typically used for DHW control.
Setpoint Priorities
Changing the setpoint can be done in many ways. If a higher
level setpoint control is lost, the next level setpoint control is
used until the System Setpoint is loaded. The setpoints are
prioritized in the following order:
1. 0-10V, 4-20MA setpoint Control
2. BMS, Modbus Setpoint
3. Outdoor Reset Setpoint
4.
Menu’s System Setpoint
Any Setbacks that are active are then applied.
Circulator Pump Options
There are provisions for 2 system pumps (1 system pump if
Lite version) and a local pump. This is to allow for
primary/secondary loop configurations. The system circulator
pump is implemented using the K4, K13 RELAY and
normally open contacts at J16 SYSTEM PUMP 1 and
SYSTEM PUMP 2.
The pumps require motor contactors to isolate
the on-board relay contacts. The on-board
relays should never be used to energize large
pumps directly.
Figure 45 illustrates the
connections without contactors for illustrative
purpose.
Figure 45 System Pump connections
The system circulator pump is supported by (2) modes and
special features.
1. The first mode will allow the circulator pump to remain
on, unless the control’s outside high air temperature
setting has been met when using OUTDOOR AIR
RESET.
2. The second mode will allow the circulator pump to be
turned on whenever there is a call for heat (any control
input). This mode will stop the circulator pump when the
call for heat is lost and the pump post purge time has
been satisfied.
The summer pump jog is a special feature that can be
selected when the system is in summer shutdown
(OUTDOOR RESET). The jog allows the system circulator
pump(s) and the local pump to run for the system pump
purge time once a week. It can be set to any day of the week
and will occur at 12:01 AM. If (2) system pumps are present,
and after the first pump finishes its post purge, the second
one will start and the first one will stop.
K4
K13
System Flow
Prove Switch
System Pump 1
System Pump 2
(Not Available
On Lite Version)