Eco Control Operation - Weil-McLain Series 2 Manual

® S
ERIES

ECO control operation

Temperature settings
that the ECO 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
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
a ECO control external limit circuit. Failure
to provide regulation can result in substantial
property damage.
Control features
❏
Blower speed modulation to control the ECO boiler's firing rate.
❏
Advanced PID response to anticipate system needs based on
response to heat input.
❏
Robust text display for ease of operation monitoring and
troubleshooting.
❏
Control of two dedicated inputs for DHW and HEAT
respectively.
❏
Integral outdoor reset option (see page 127).
❏
Dual sensors for boiler outlet temperature and flue temperature,
providing redundant protection.
❏
Low water cut-off, (field wired or optional kit).
❏
Boiler is shipped with an outdoor sensor, allowing outdoor
reset operation for maximum boiler efficiency. See page 127.
❏
Freeze protection and circulator exercising.
Sequence of operation
1. Figure 76 is a summary of the operating sequence for the ECO
control.
❏
The statuses shown appear in the display as the ECO control
cycles the boiler.
❏
The display will flash red if a problem has been detected.
ECO control setup
BEFORE PROCEEDING, perform ESSENTIAL
control settings as instructed on page 69.
1. See Figure 78, page 70 for an overview of the ECO control
menus. This page also gives the location of instruction manual
information for each of the main menus.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
— You must ensure
— If the
— Boiler Manual
Figure 76 Control sequence of operation
Display
Control action
status
(also see Figure 77, page 68)
text
• Check the boiler model listed on the power-up screen.
If it is not correct, turn off the boiler. See page 70 to
POWER
change setting.
UP • 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.
• If no outdoor temperature (ODT) sensor is detected,
ODT Sensor
this screen will appear
Notice
• Boiler must either use the ODT sensor or be exempt (see
(Initial
page 127) to operate.
Startup
• Non-exempt boilers without a detected ODT sensor
ONLY)
will not operate.
• Standby — no calls for heat.
Standby
• Backlight will turn off due inactivity.
• Call for heat detected.
• Display on with BLUE light (HEAT) or PURPLE light
(DHW).
• Start min./max. on timers if more than one system is
Prepurge calling — highest priority starts first.
• Start circulators for this priority setup.
• 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.
Ignition • 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 control starts cycle
HEATING 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 control starts cycle
DHW
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.
Postpurge
• Blower to ignition speed for postpurge.
• Return to standby after purge.
• Display turns RED due to error or limit event.
Error/fault
• Flashing display means lockout condition.
• Warm weather shutdown — the boiler will not
be allowed to fire on space heating if the outside
WWSD
temperature is greater than the WWSD setting. DHW
operation is not affected by WWSD.
67