LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 52)

LAARS Heating Systems Page 48
The controller in the Magnatherm energizes the
appropriate pump contacts when it receives a call for heat.
Once the call for heat is satisfied, the pumps will remain
on for the defined pump overrun time.
The Boiler, System, and DHW pump terminals are
found on the Main control board TB1-15A through 20A.
They are fed 120 Volts internally from the main power
feed. The current rating of the contacts is 7.4 amps, and
an appropriately sized contactor must be supplied and
installed by a qualified technician to ensure proper pump
operation. Once the system has been installed, the “Pump
Configuration” menu will allow the installer to adjust
Pump control, Overrun time and Demand control for the
various pumps in the system.
9.7.9 Statistics Configuration
The statistics configuration menu allows the installer
to view Burner Cycles, Burner Run Time, DHW Pump
Cycles, Boiler Pump Cycles, and System Pump Cycles.
This menu is ‘Read-Only’
9.7.10 High Limits
The outlet High limit can be adjusted using the installer
password. After a change is made, the control will lockout
and require a Safety Verification (see Section 9.3 for more
details on Safety Verification).
Installers do not have access to change the Outlet High
Limit Response. That is only accessible to the factory.
9.7.11 Stack Limits
Stack limit delay, response and setpoint can be
changed ONLY BY THE FACTORY.
9.7.12 Delta T Limits-
Magnatherm is shipped with a factory set Delta T
(temperature rise) limit of 60 degrees F. The installer
has the ability to adjust the Delta T inlet/outlet degree
set point, Delta T delay, Delta T response, and the Delta
T retry limit using the installer level password. Only
the factory may disable this function.
9.7.13 Frost Protection
Frost protection will assist in keeping the
MagnaTherm from freezing when the unit is not
able to fire, but is still able to run the pumps. The
frost overrun time can be changed.