Install Instructions

Page 44
LAARS Heating Systems
Control Settings for Lead Lag System - Part 2
1. On the Lead Lag Master, set the setpoint used by the Lead
Lag system.
How to get there: From the “Home” screen, press “I” to
go to “Info/Install.” Choose “Advanced Setup,” then go
to “Lead/ Lag Conguration.” Select “Lead Lag Master
Conguration,” and go to the line for “Setpoint.”
2. On the Lead Lag Master, set the Base Load to match
the number of boilers in the system. We mentioned the
Base Load setting in the explanation of the “Lead Lag
Modulation Cycle.” Whenever the heating demand causes
the active burner(s) to run faster than the Base Load value,
the Lead Lag system will put an additional burner on line.
The Base Load value depends on the number of boilers in
the system:
Note that you only need to enter the Base Load value on the
Lead Lag Master.
How to get there: From the “Home” screen, press “I” to
go to “Info/Install.” Choose “Advanced Setup,” then go
to “Lead/ Lag Conguration.” Select “Lead Lag Master
Conguration.” Go to the line for “Base Load Common
Rate.”
8.14 AboutLeadLagOperation
(continued)
8.15 Adjusting CO
2
1. Measure the CO
2
/O
2
in the ue products at high re.
The NeoTherm can be forced to high re to allow for
easier setup. The controller has a feature that makes it
easy to go directly to the high re condition. The unit
will operate at high re for 5 minutes, then modulate
down automatically.
How to get there: From the “Home” screen,
press “I” to go to “Info/ Install.” Choose “Test,” then
go to “Forced Rate.” Select “Set High Fire,” then
select “Start Test.”
The CO
2
readings should be between the values shown
in Table 20. If the CO
2
is not within the range shown,
adjustments may be made. To adjust the high re CO
2
,
locate the high re adjuster screw according to the
appropriate gure. Slowly make adjustments in 1/16
of a revolution increments until the CO
2
is within the
range identied.
2. Measure the CO
2
/O
2
in the ue products at low re.
NeoTherm can be forced to low re to allow for easier
setup.
How to get there: From the “Home” screen, press
“I” to go to “Info/ Install.” Choose “Test,” then go
to “Forced Rate.” Select “Set High Fire,” then select
“Start Test.”
The CO
2
readings should be between the values shown
in Table 20. If the CO
2
is not within the range shown,
adjustments may be made. To adjust the low re CO
2
,
locate the low re adjuster screw according to the
appropriate gure. Slowly make adjustments in 1/16
of a revolution increments until the CO
2
is within the
range identied.
3. Repeat steps 1 and 2 to conrm that the CO
2
ranges are
within the required ranges. Adjust if necessary.
4. Conrm that the differential pressure is still within the
appropriate range.
5. If any of the measurements cannot be adjusted
to the specied ranges or the CO levels are above
150ppm when adjusted, please consult the factory
for further information.
WARNING
Improper adjustment may lead to poor combustion
quality, increasing the amount of carbon monoxide
produced. Excessive carbon monoxide levels may
lead to personal injury or death.