RBI HEATNET 3.0 Torus Series, Руководство пользователя

Страница: 16 / 136

CONTROL METHODS HeatNet Control V3
Page 16
In the example Mixed Boilers: Condensing/Non-
Condensing , condensing boilers and non-condensing boilers
are used, but other combinations may also be used. Another
example could use (2) small boilers and set them to
Priority 1 and then use (3) larger boilers and set them to
Priority 2. Using these Priority settings (with the conditions
menu), the small boilers can run first during the shoulder
months (Spring and Fall) and the larger boilers can fire last
during the colder Winter season (base loading set).
Before the MIXED method can be used, the firing mode on
the Master boiler must be set to
MIXED. SETTINGS:
FIRING MODE: MIXED
. Pressing the MIXED BOILERS
tab will enter the conditions menu. The
START
and
STOP
conditions for starting and stopping the Priority boiler set
may be configured here. Temperatures are adjustable.
Once the Mixed Boilers menu has been entered, the firing
order and stop order of the Priority 1 boiler set can be
selected based on up to (3) conditions in the conditional
settings menu. All conditional settings apply to the
Priority 1 boiler set. When the conditional settings do not
apply to the Priority 1 set, the conditional settings will apply
to the Priority 2 boiler set.
Note: If the firmware version for a HeatNet V2 board is at
least 3.47(or a version 3 board), the non-condensing boiler
may hold itself off from being added to the HeatNet
Master’s available to fire list. This would effectively keep
the non-condensing boiler from firing in a condensing
mode, but as a result, may not satisfy the system setpoint.
See: SETTINGS: HEAT EXCHANGER TEMP DISAB:
Start/Stop Priority Conditions
The following is an example using mixed
condensing and non-condensing boilers:
FIRE FIRST
Condensing boilers may be configured to fire first (set to
PRIORITY 1) when:
2. The Return water temperature is below 140F, and
condensing occurs. (The Master’s system return water
would need to be used.)
3. The Outside Air Temperature is above a setpoint
determined by the system configuration. This setpoint
ensures that the more efficient condensing boilers run
first during shoulder months (Spring and Fall) when
minimal heating is required. Below this setpoint, larger
boilers should be brought on first to “base load” the
system.
4. Greater efficiency is required.
STOP FIRST
Condensing boilers may be configured to stop first (set to
PRIORITY 1) when:
The Return water temperature is above 140F and
condensing is minimized, thus leaving the larger lower cost
boilers running to carry the load.
1. The Outside Air Temperature is below an adjustable
setpoint determined by the system configuration. This
setpoint ensures that the larger non-condensing boilers
run during the coldest months when maximum heating
is required. Above this setpoint smaller condensing
boilers should be brought on first to run the system as
efficiently as possible.
2. Maximum heating is required
START PRIORITY 1 SET
Selections (always the lowest runtime first):
The condensing boiler set (Priority 1) has a
higher Priority to fire when one of these
conditions is met. Values are adjustable.
FIRST
: The condensing boilers (Priority 1) are always
started FIRST
OA T > 15F
: The condensing boilers (Priority 1) are
started when the OA temperature is greater than the Mixed
Boiler Outdoor Air Temperature setting.
RET < 140F
: The condensing boilers (Priority 1) are
started when the Return water temperature is less than the
Mixed Boiler Return temperature setting (This may not be
applicable in most configurations since the local return
temperature on the Master is used to provide a difference
temperature across the heat exchanger. A System Return
sensor will be required. However, the return temperature
sensor may have been moved on the Master to provide
system return temperature on existing installations and is
still supported).
STOP PRIORITY 1 SET
Selections (always the highest runtime first):