Laars MagnaTherm MGH1600 Installation And Operation Instructions Manual page 70

Page 66
8. MagnaTherm is equipped with a zero
governing, negative regulator valve. The valve
throttle should be adjusted only at high fire,
and the offset adjustment is only to be done at
low fire. From the "Home" screen touch the
control icon, then touch, Diagnostics. On the
I/O status screen press "Diagnostic Tests" and
enter the installer password by pressing the
padlock in the upper right corner.
Menu 26. Burner Status
Menu 27. I/0 Status
9. From here you can manually adjust the fan
speed by pressing either the "Maximum
Modulation" or "Minimum Modulation"
buttons, then the "Start Test" button. In this
mode the boiler will run at the selected firing
rate for a period of five minutes or until the
"Stop Test" button is pressed. The fan speed
control feature is only active when the boiler
is in "Run" mode. To setup high fire select
"maximum modulation", then "Start Test"
buttons. Wait for the boiler to enter run and
the fan speed to reach the maximum RPM.
Using a combustion analyzer, dial in the high
fire throttle to obtain the correct CO2 and CO
measurements. (refer to table 16 for correct
CO2 ranges).
LAARS Heating Systems
Menu 28. Modulation Test
10. Once high fire is setup correctly select
"Minimum Modulation" and wait for the
fan speed to reach minimum RPM. When
at low fire adjust the offset screw to adjust
the low fire CO2 to the correct values.
(refer to table 16 for correct CO2 ranges)
11. After the setup for High and Low fire have
been completed, head back to the "Firing
Rate" menu, and select "Automatic". This
MUST be done to ensure proper boiler
operation.
Model Propane
Orifice (inches)
1600 0.035
2000 0.040
2500 0.035
3000 0.035
3500 0.047
4000 0.047
Table 16. Required Gas Pressures
Propane Natural
Pressure Pressure
3" - 4" 3" - 4"
3" - 4" 3" - 4"
3" - 4" 3" - 4"
3" - 4" 3" - 4"
2" - 3" 3" - 4"
2" - 3" 3" - 4"