Sola Control Overview & Sequence Of Operation; Damage - Weil-McLain SlimFit Manual

SlimFit
™
commercial condensing gas
Sola control overview & sequence of operation
Temperature settings
Sola is set for the proper water temperatures for the sys-
tem. Excessive water temperature can cause significant
property damage in some applications.
Multi-temperature systems
includes circuits that require lower temperature water
(radiant slab circuits, for example) as well as higher tem-
perature circuits (DHW, finned tube baseboard, etc.),
it is recommended to protect low-temperature circuits
with limit controls that are wired to a Sola external
limit circuit. Failure to provide regulation can result in
substantial property damage.
Sola overview
The Sola is fully programmable to meet system requirements, allowing
supply water regulation for central heating (CH) and domestic hot water
heating (DHW).
Some of the Sola features:
❏ Blower speed modulation to control the SlimFit boiler's firing rate.
❏ Advanced PID response to anticipate system needs based on response
to heat input.
❏ Graphic and robust touch-screen display for ease of operation, monitor-
ing and troubleshooting.
❏ Control of up to three pumps.
❏ Programmable priority assignments.
❏ Integral outdoor reset option.
❏ 4–20 mA analog input for remote setpoint or modulation control.
❏ 4–20 mA or 0–10 VDC output for remote firing rate monitoring.
❏ Multiple boiler sequencing.
❏ Factory-installed temperature sensors for boiler in, heat exchanger,
boiler out and flue.
❏ The boiler is equipped with a low water cutoff, factory wired to the
Sola control, manually reset through the device and the Sola control.
❏ The boiler is shipped with an outdoor sensor and strap-on system supply
sensor for field installation.
58
-
fired water boiler
— You must ensure that the
— If the heating system
— Boiler Manual
Sequence of operation
Initiation sequence
1. The Sola control enters the Initiate sequence on Initial
Power up or under the following conditions:
a. If Demand, LCI, or STAT interrupts (opens) during
the Prepurge Period.
b. After the reset button is pressed or a fault is cleared
at the display.
2. The Initiate sequence also delays the burner motor from
being energized and de-energized from an intermittent
AC line input or control input.
3. If an AC line problem exists for more than 240 seconds,
a lockout will occur.
Space Heating (CH) operating sequence
1. Heat request detected (On Setpoint – On Hysteresis).
2. The space heating pump(s) is switched on.
3. After a system Safe Start Check, the Blower is switched
on.
4. After the ILK circuit is closed and the purge rate proving
blower RPM is achieved — prepurge time is started.
5. When the purge time is complete, the purge blower
RPM is changed to the Ignition Rate.
6. As soon as the blower rpm is equal to the ignition rpm,
the Trial for Ignition is started.
7. The ignition and the gas valve are switched on.
8. The ignition is turned off at the end of the direct burner
ignition period.
9. The blower is kept at the ignition rate during the stabi-
lization period.
Part number 550-100-116/0713