LAARS MagnaTherm MGV - Installation, Operation and Maintenance Instructions - Manual (Page 53)

MagnaTherm Boilers and Water Heaters Page 49
9.7.14 Burner Control Ignition
The Pilot test hold function allows the installer to set
the pilot flame to the required pressures listed in Table
14, without turning on the Main valve. With a call for
heat enabled the unit will start the normal sequence of
operation to light the pilot only. Once pilot pressure has
been properly set, the installer must disable call for heat
and turn this feature “OFF”. The next time a call for heat
is supplied the unit will light normally.
Model Propane
Orifice (inches)
Propane
Pressure
Natural
Pressure
2000 0.040 3” - 4” 3” - 4”
2500 0.035 3” - 4” 3” - 4”
3000 0.035 3” - 4” 3” - 4”
3500 0.047 2” - 3” 3” - 4”
4000 0.047 2” - 3” 3” - 4”
Table 14. Required Gas Pressures
9.7.15 System Configuration
The installer can set the control to display
temperature units in °F or °C, can adjust the anti
short -cycle time, the low fire cutoff time, burner
off inhibit time, and can set the time allowed for an
alarm to sound before being silenced.
9.7.16 Sensor Configuration
The outdoor temperature can be read from
the outdoor sensor that is shipped with the
MagnaTherm, or from an Envirocom outdoor sensor
(sold separately). The Sensor Configuration screen
allows the installer to tell the control which sensor is
being used.