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SlimFit
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
Figure 59, page 66 and following pages for information.)
2. See instructions beginning on page 61 for basic systems and mini-
mum settings required (using factory defaults).
3. This manual provides set-up information for a single boiler using BA-
SIC control setting options. See the SlimFit Advanced Manual for sin-
gle-boiler advanced settings and for all multiple boiler applications.
could result in severe personal injury, death or substantial property
damage.
— You must ensure that the Control is set for
the proper water temperatures for the system. Excessive water tem-
perature can cause significant property damage in some applications.
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 redun-
dant 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 set 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 52 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 56, page 64 for screen shots.
The display will flash red if a problem has been detected.
60
-
FIRED WATER BOILER
Failure to set correctly
— If the heating system includes circuits
—
Boiler Manual Series 2
Control sequence of operation
(Also see Figure 56, page 64)
Check the boiler model listed on the power-up
screen. If it is not correct, turn off the boiler. See
page 67 for instructions to change setting.
When power is turned on, the screen lists sensors
that 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 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
calling - highest priority starts first.
Start circulators for this priority setup based upon
settings.
Calculate target temp — If sensor temp is below
target temp, begin firing sequence.
Blower to ignition speed for prepurge.
After prepurge times out, begin ignition cycle.
Activate gas valve and ignition spark.
Continue ignition spark for ignition period.
Turn off spark and use electrode 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 con-
trol starts cycle again. After 5 failures, the control
waits 60 minutes, then tries again.
If priority timer times out, switch to next priority
and 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 con-
trol starts cycle again. After 5 failures, the control
waits 60 minutes, then tries again.
If priority timer times out, switch to next priority
and start priority timer.
If demand satisfied, go to postpurge.
Demand satisfied (temperature reaches target
temperature or limit setting).
Gas valve off.
Blower to ignition speed for postpurge.
Return to standby after purge.
Display turns BLUE, toggling between graphic
screen and maintenance screen (occurs if mainte-
nance schedule timer times out).
Will show during standby only.
Boiler operates as normal.
Display turns RED due to error or limit event.
Flashing display means lockout condition.
Warm weather shut down - the boiler will not
be allowed to fire on space heating if the outside
temperature is greater than the WWSD setting.
DHW operation is not affected by WWSD.
Part number 550-100-162/0815
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