Lanair MXB360 - Manual (Page 26)

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Section 14 - Controls
Fuel Pump Controls and Operation
• Fuel Regulator:
A Fuel regulator is used to adjust the fuel pressure of waste oil to the burner.
• Fuel Relief Valve:
The fuel relief valve prevents excess pressure build-up in the fuel line upon burner shut-down.
Boiler Controls and Operation
• Hi-Limit Switch:
Hi-limit switches are immersion type devices for regulating the temperature of liquids in a boiler where temperature
control is required. The Hi-limit switch is mounted to the supply manifold at the rear of the boiler (see page 21 for
details).
• Low Water Cut-Out:
The low water cut-out switch is located on the supply manifold at the rear of the boiler. This device will turn the sys-
tem off if it senses low water levels or pressure. The low water cut-out switch is mounted to the manifold at the rear
of the boiler (see page 21 for details).
• Aquastat
The aquastat is an immersion type device for limiting the temperature of liquids in a boiler. The aquastat is mounted
to the cabinet and the sensor is installed at the rear of the boiler next to the pressure relief valve (see page 20)
• Pressure Relief Valve:
The Pressure Relief Valve is mounted to the top of the boiler near the rear. This valve is used to automatically or
manually release excess pressure which may be present in the boiler. See page 20.
• Temperature/Pressure Gauge:
This dual purpose gauge monitors supply temperature and pressure. The temperature/pressure gauge is mounted
to the supply manifold at the rear of the boiler (see page 21).
Section 15 - Start-Up Procedures
Boiler Start-Up - Fill System
1. Fill boiler and system according to job specifications. System pressure should be set to have 5 PSI pressure at the
highest point in the heating system. Boiler pressure gauge will indicate pressure relative to the height of water col-
umn from the boiler to the highest point, plus the additional 5 PSI.
Example: To calculate cold fill pressure: Highest point in system is 40’; 40 ÷ 2.31 = 17.32 (1 PSI = 2.31 ft w.c.)
Add 5 PSI to 17.32 = 22.32 PSI; boiler pressure gauge will indicate 22.32 PSI (cold fill pressure)
2. Purge air from boiler and system . WARNING: Never purge system while boiler is in operation or fill a hot/empty
boiler with cold water
The expansion tank must be properly sized to system requirements. An undersized expansion tank will
cause system water to be lost through the relief valve and make-up water to be introduced through the fill
valve eventually causing mineral build-up in the boiler sections which could lead to eventual section failure. !