Control Operation And Setup - Weil-McLain SVF Series 1 Manual

SVF ™
Series 1
COMMERCIAL CONDENSING GAS

Control operation and setup

Control setup
1. Set control parameters using the WIZARD option provided on initial
start-up or manually enter parameters using control menus (see Fig-
ure 56, page 68 and following pages for information.)
2. See instructions beginning on page 63 for basic systems and minimum
settings required (using factory defaults).
3. This manual provides set-up information for a single boiler using
BASIC control setting options. See the SVF
single-boiler advanced settings and for all multiple boiler applications.
Boiler Model, Altitude are critical settings.
could result in severe personal injury, death or substantial property damage.
Temperature settings — You must ensure that the Control is set for the
proper water temperatures for the system. Excessive water temperature can
cause significant property damage in some applications.
Multi-temperature systems — If the heating system includes circuits
that require lower temperature water (radiant slab circuits, 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 an Control external limit circuit. Failure to provide regulation
can result in substantial property damage.
Control features
❏ Single or multiple boiler control (with lead boiler rotation).
❏ Graphic and robust text display for ease of operation monitoring and
troubleshooting.
❏ Three programmable priority assignments for up to three heat inputs.
❏ Preset operating parameters for typical heating systems, including target
temperatures, reset curves and circulator assignments.
❏ Integral outdoor reset option, with reset curves matched to the system type
selected.
❏ ModBus communications for external communication and monitoring.
❏ 0-10VDC input modulation or remote target input.
❏ Four pump outputs, 3 – powered, 1– dry contact.
❏ Additional heat demand operation to call a second heat source to help supply
the energy required for heating.
❏ Advanced PI response to anticipate system needs.
❏ Flue temperature modifier to target temperature.
❏ Modulation based on flue sensor and boiler/system supply/return sensors.
❏ Dual temperature sensors on boiler outlet and flue, providing redundant
protection.
❏ Boiler is shipped with an outdoor sensor and strap on system supply and
return sensors.
❏ Blower speed modulation to control boiler firing rate.
❏ Alarm relay on error/fault for use with an audible safety.
❏ CSD-1 Valve seat leakage test feature (See Advanced Manual).
❏ Built-in 0–10 VDC signal generator to allow parallel modulation of
multiple boilers; also capable of accepting 0–10 VDC input.
❏ The boiler is equipped with a low water cutoff, factory wired to the
Control, manually reset through the Control.
Sequence of operation
1. Figure 49 is a summary of the operating sequence for the Control.
• The statuses shown appear in the display as the Control cycles the boiler.
See Figure 53, page 66 for screen shots.
• The display will flash red if a problem has been detected.
62
-
FIRED WATER BOILER
TM
Advanced Manual for
Failure to set correctly
— Boiler Manual
Figure 49
Control sequence of operation
Display
Control action
status
(Also see Figure 53, page 66)
text
• Check the boiler model listed on the power-up screen.
If it is not correct, turn off the boiler. See page 69 for
POWER
instructions to change setting.
• When power is turned on, the screen lists sensors that
UP
are detected. If any sensor is not listed, make sure it is
connected correctly. Turn off power and restart.
• Standby - no calls for heat.
• Toggles through no dots, 1 dot, 2 dots, then 3 dots
while in standby (wrench symbol will show instead if
Standby
maintenance is needed).
• Call for heat detected.
• Display on with BLUE light (space heating) or
PURPLE light (DHW).
• Start min/max timers if more than one system is call-
ing - highest priority starts first.
• Start circulators for this priority setup based upon
settings.
Blower
• Calculate target temp — If sensor temp is below target
temp, begin firing sequence.
ON
• Wait on closure switch.
• Blower to purge speed for prepurge.
• Min air flow switch.
• Pre-purge.
• After prepurge times out, transition to ignition speed.
• Begin ignition cycle.
• Activate gas valve and ignition spark.
• Continue ignition spark for ignition period.
Ignition
• Turn off spark and use flame rod to check for flame
signal.
• Flame detected.
• Release boiler to modulation.
• NOTE: If flame is not detected, the gas valve is turned
off, blower turns on (postpurge), and control starts
cycle again. After 2 failures, the control locks out.
Space
• If priority timer times out, switch to next priority and
Heating
start priority timer.
• If demand satisfied, go to postpurge.
• Flame detected.
• Release boiler to modulation.
• NOTE: If flame is not detected, the gas valve is turned
off, blower turns on (postpurge), and control starts
DHW
cycle again. After 2 failures, the control locks out.
Heating
• If priority timer times out, switch to next priority and
start priority timer.
• If demand satisfied, go to postpurge.
• Demand satisfied (temperature reaches target tempera-
ture or limit setting).
• Gas valve off.
Blower
• Blower to ignition speed for postpurge.
OFF
• Return to standby after purge.
• Display turns BLUE, toggling between graphic screen
and maintenance screen (occurs if maintenance sched-
ule timer times out).
• Will show during standby only.
Maintenance
• Boiler operates as normal.
• Display turns RED due to error or limit event.
• Flashing display means lockout condition.
Error/fault
• Warm weather shut down - the boiler will not be al-
lowed to fire on space heating if the outside tempera-
ture is greater than the WWSD setting.
WWSD
• DHW operation is not affected by WWSD.
Part number 550-100-200/1018