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Part number 550-100-252/0520
– 3 –
Unity
TM
Control — Advanced mode
Unity
TM
control overview
Basic Boiler Features:
• Easy configuration with WIZARD step-by-step setup including
on-screen help.
• BASIC boiler settings mode for streamlined menu navigation of
essential settings.
• Three customizable input/output pairs—use as a 3-Zone control
or a 3-Priority control.
• Configure outputs to control System Pumps or 120VAC Auxiliary
equipment.
• System type presets simplify system temperature selection.
• 0-10VDC Input can modulate boiler firing rate or target.
• Integral outdoor reset with warm weather shutdown.
Advanced Boiler Features:
• ADVANCED boiler settings mode unlocks all features and cus-
tomizable parameters.
• Manage multiple types of System Pumps or 120 VAC Auxiliary
accessories.
• Manage staged heating sources using the Additional Heat Demand
feature.
• BMS integration with MODBUS standard.
Multiple Boiler (Network) Features:
(see next page for explanation of Priorities)
• Create a network of up to eight (8) boilers using built-in controls.
• Master boiler controls the modulation and sequencing of boilers
on the network to achieve desired system supply temperature.
• Use ALL boiler inputs, not just the first and last boilers, up to 24
customizable inputs across boiler network (3 per unit, maximum
of eight (8) boilers on network).
• Two (2) available Network Priorities allow multiple
system types/temperature zones.
• Direct-connected DHW tanks (or other heating zones)
can be piped and wired locally to any boiler in the system,
not just the first or the last.
• Three system modulation types—SERIES, PARALLEL,
AND SMART.
• Three (3) Lead boiler rotation modes (plus OFF).
• Limit the firing rate for each Network Priority indepen-
dently when heat demands are mismatched using the
Max System Rate parameter.
• Fire multiple boilers at initial call for heat to start up
quickly for high demand applications using the Mini-
mum Boilers parameter.
• Won’t interrupt a Local heat demand (such as direct-
connected DHW tank) to satisfy Network heat demand
unless all available boilers are at maximum input.
• Simple, 3-wire boiler-to-boiler communication con-
nection.
Additional Heat Demand Features:
• Provides contact and modulating output to activate other
boilers or heating sources (SVF
TM
boiler collaborating
with a heat pump or a different boiler, for example).
• Modulating output limited to 10VDC; 108 μ A.
• Configure to operate additional heat demand functional-
ity 1st (before
SVF
TM
boiler) or 2nd (after SVF
TM
boiler).
• Select the response time that the primary source is al-
lowed to function before the additional heat demand
activates the secondary source.
• Switch between 1st and 2nd based on a set outdoor tem-
perature for use in base loading applications.
• Select if the additional heat source is activated based on
the system temperatures being monitored by the
SVF
TM
boiler (system temperature dependent YES).
Unity
TM
control operation
• The control responds to signals from:
• Room thermostats
• DHW aquastats (if used)
• Temperature sensors — boiler return, boiler supply,
flue temperature and, when used, system supply and
system return, outdoor temperature. For optimal
performance, it is recommended to install
the system supply and return sensors.
• The control automatically adjusts blower speed (and gas
flow rate) to match boiler output to space heating and/
or DHW heating demand.
• The control provides three inputs and three outputs (for
circulators or auxiliary devices) plus a boiler circulator
output.
• Outdoor reset are recommended to be used in all ap-
plication.
• The outdoor temperature is used for supply tem-
perature reset operation and for the warm weather
shutdown (WWSD) option.
• See “Outdoor reset operation” on page 4 for complete
explanation of outdoor reset settings.
• System presets
• The
Unity
TM
control provides presets by System
Type (see Figure 33, page 54 for complete list).
Unity
TM
control setup
1. Set control parameters using the WIZARD option provided
on initial start-up or manually enter parameters using control
menus explained later in this manual.
2. See
Fast-Track setup
instructions beginning on page 11 for
example applications and minimum settings required (using
factory defaults).
3. This manual provides set-up information for a single-boiler
advanced settings and for all multiple boiler applications.
Boiler Model and Altitude are critical settings. Failure to set
correctly could result in severe personal injury, death or substantial
property damage.
Temperature settings — You must ensure that the SVF
TM
control is set for the proper water temperatures for the system.
Excessive water temperature can cause significant property dam-
age in some applications.
Multi-temperature systems — If the heating system includes
circuits that require lower temperature water (radiant slab cir-
cuits, for example) as well as higher temperature circuits (DHW,
finned tube baseboard, etc.), it is recommended to protect low-
temperature circuits with limit controls that are wired to one of
the external limit circuits on the boiler control. Failure to provide
regulation can result in substantial property damage.
SVF
™
Series 1
COMMERCIAL CONDENSING GAS-FIRED WAT ER BOILER
— Advanced Manual
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