Weil-McLain SVF 1500 Manual page 98

SVF
™
Series 1
Commercial Condensing Gas-Fired Water Boiler — Boiler Manual
Annual startup
Check flame signal
The Unity TM
Control has 3 distinct flame signal thresholds that it
uses to operate the boiler safely and reliably.
Boost: The highest flame signal threshold, when the flame
signal drops below this value, the control take action to try
and boost or increase the flame sense value by changing how
the boiler is operating.
Shutdown: This is the intermediate flame signal threshold, if
the control senses a flame quality below this value, it will de-
energize the gas valve extinguishing the flame. The boiler will
then proceed through its normal operating process of purging
and attempting another ignition if the demand is still active.
The lowest flame signal threshold, this is the
flame signal value that indicates there has been a successful
ignition.
1. Navigate to Diagnostics/Inputs on the Control display (see
Figure 72, page 79).
2. A lower flame signal may indicate a fouled ignitor or damaged
ignitor insulation. If cleaning the ignitor does not improve, ground
wiring is in good condition, and ground continuity is satisfactory,
replace the ignitor.
When the flame signal wire is routed within 3" of the
ignition cable and the boiler is in an ignition sequence,
the ignition cable may cause noise in the flame signal
transmission resulting in a false flame signal value.
3. If flame signal still remains low, inspect the vent and air piping.
Then inspect the heat exchanger, following the procedures given
in this manual for removal and reinstallation of the heat exchanger
cover plate and other boiler components. Clean the heat exchanger
as described in this manual if necessary.
Figure 94
Flame signal shutdown values
Natural Gas
Boost
SVF
1500 84
SVF
2000 84
SVF
2500 116
SVF
116
3000
Boost
SVF
1500 140
SVF
2000 140
SVF
2500 120
SVF
3000 120
98
(continued)
of
64 28
64 28
96 28
96 28
of
120 28
120 28
100 28
100 28
Check flue gas temperature
1. Set the boiler to high fire. Then adjust the control module display
to view flue gas temperature and boiler return temperature.
2. The flue gas temperature should be no more than 30°F higher
than the boiler return temperature.
3. If the flue temperature is higher than this, shut down the boiler,
allow to cool, and follow the procedure starting on page 108 to
clean the heat exchanger.
Check blower speeds
1. For installations at altitudes above 5,500 feet, make sure the
control is set up for high altitude in the boiler setup menu. The
Control module automatically adjusts low fire and ignition rates
to compensate for high altitude conditions.
2. For installations below 5,500 feet, DO NOT enable high altitude.
3. Use the Control display to navigate to Manual test mode (see
Figure 73, page 80).
4. Set the firing rate to Low (low fire).
5. Write down the blower RPM value shown and compare to the
value in the table in Figure 79, page 88. Low fire rate (and cor-
responding blower speed) is adjusted in the boiler setup menu.
6. Set the firing rate to MEDIUM (ignition rate).
7. Write down the blower RPM value. It should be within 200 RPM
of the value listed in the table in Figure 79, page 88.
8. Set the firing rate to High (high fire).
9. Write down the blower RPM value. It should be within 200 RPM
of the value given in the table in Figure 79, page 88.
10. If any of the values are outside the ranges listed in the previous
steps, contact the factory for technical assistance.
Manual Test Mode for Single and
Multiple Boilers
Single Boiler
1. Navigate to Manual Test Mode screen under DIAGNOSTICS
menu.
2. Generate a call for heat and wait until the burner is lit, if not yet
in operation.
3. Press ENTER and select the desired FORCE RATE. Rate will be
forced to setting for 10 minutes.
Review with owner
TM
1. Review the SVF
User's Information Manual with the owner.
2. Emphasize the following to the owner:
a. Perform the maintenance schedule specified in the User's
Information Manual.
b. Call a licensed contractor should the boiler or system exhibit
any unusual behavior.
c. Follow the proper shutdown procedure.
d. Schedule an annual startup at the beginning of the next heat-
ing season.
Part number 550-100-250/0819