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OPTIONAL FEATURES
HeatNet Control V3
Page 63
This MEMBER boiler will continue to run at the
LOCAL setpoint until H-NET communications from the
MASTER boiler is re-established.
Ensure that this Member boiler’s Damper and System
pump control are configured correctly with the
assumption that the Master is not powered. Also ensure
that any other System settings related to outside air
temperature sensing and system interlocks are set to
provide safe operation.
3.
Domestic Hot Water Failsafe
If the DHW mode is set for Combination, a DHW
MEMBER boiler can be set up as a DHW Failsafe
boiler.
If a 10K sensor is used, connect to DHW TANK, J10 A,
9 & 10 of the Member Failsafe boiler. If there is only
one location for a 10K sensor, a dual sensor (14-0328, 4”
& 14-0329, 6”) is available that would be connected to
the Master and Member Failsafe boilers DHW TANK
sensor input. A jumper wire must be landed on the OR
OVR, J12A, 7 & 8 and JPS1 must be cut.
SETUP: AUX FUNCTIONS: FAILSAFE MODES:
H-NET COMM LOST: ON.
SETUP: DOMESTIC HOT WATER: DHW
BOILER?: COMBO. USE SENSOR: YES.
If an aquastat is used, connect it to OR OVR, J12A, 7 &
8 of the Member Failsafe boiler. If there is only one
location for an aquastat, then a dual aquastat must be
used. JPS1 must be cut.
SETUP: AUX FUNCTIONS: FAILSAFE MODES:
H-NET COMM LOST: ON.
SETUP: DOMESTIC HOT WATER: DHW
BOILER?: COMBO. USE SENSOR: NO.
Other DHW menu settings should be setup like the
Master boiler.
ADVANCED SETUP: DISTRIBUTED CONTROL:
MASTER TYPE: AUTO.
4.
Low Temperature Protection
LOW TEMP: OFF, SUPPLY, HEADER, DHW, or
RETURN
This mode may be used by the MASTER or MEMBER
boiler and can be used as a type of freeze protection. In
this mode you may select which Sensor you wish to
monitor, or you may opt to turn this mode OFF. If you
select a sensor, you may then associate it with a
temperature at which the boiler will turn ON. Once the
temperature at this sensor falls below the LOW TEMP
temperature the boiler will start and fire to its LOCAL
setpoint. Once the Boiler reaches its setpoint it will turn
OFF.
Category 1 Venting
The version 3 control supports Category 1 Venting. If the
boiler is a Category 1 Venting version then the Category 1
Version of the firmware MUST be used, and the Category 1
Configuration resistor MUST be installed and wired to the J7
terminals. The configuration resistor is recognized
automatically. If the Category 1 resistor is not recognized the
boiler will not fire and the "CAT 1 BOILER CONFIG" fault
message will be displayed with a timestamp.
Please contact the factory for more information on Category
1 venting.
Limited Flow Boiler Control
Options
Three methods to limit the boilers based on flow are
provided.
1.
Flow Limited Control (BMS)
2.
Boilers Limited Control (BMS)
3.
Flow Meter
The flow settings are used to limit HeatNet’s ability to add
boilers when the system flow changes. In variable flow
systems, and when the system flow is reduced, any boiler(s)
that is/are running may develop a high delta temperature
across the boiler. When this occurs, the boiler(s) will enter a
high delta T protection mode and drop to half of the rate
called for. At this time, the Master may not be able to achieve
setpoint due to the reduced output with the running boiler(s).
The Master will then call on more boilers to achieve setpoint,
but at the same time splitting the flow through the boiler(s) it
has running. The flow can be so reduced that the boiler(s) trip
their operating limits or even their high limits.
A flow meter input is supplied on the analog input 4-20 mA
(2). This input can be configured to capture flow in the
system that will be used to limit the # of boilers to fire. If a
flow meter and a System Return sensor are present, a BTU
load measurement will be displayed in the running screen
The BTU value is relative to the accuracy of the sensors and
is only available as an estimate of the BTU load. A
calibrated BTU meter would be required to get a more
accurate measurement.
The BTU load value may also be accessed through Modbus
read registers 30242 (upper 16 bit word) & 30243 (lower 16
bit word). These two words will need to be combined in
order to get the BTU load value.
Summary of Contents for FUTERA XLF Series
Page 27: ...CONTROL METHODS HeatNet Control V3 Page 27 Figure 25 Base loading relay...
Page 67: ...WIRING CONNECTIONS HeatNet Control V3 Page 67 Figure 49 Jumper Dip Switch Locations...
Page 73: ...WIRING CONNECTIONS HeatNet Control V3 Page 73 Figure 57 Temperature sensors...