L.B. White Sentinel Radiant Tube AT150 Center Mount - Manual (Page 20)

20
For proper heater operation:
■
The copper pressure tube at the burner vane must
be straight. See Fig.31.
■
Ensure the clear flexible tube is free of dust and
securely connected to the fitting at the burner and to
the fitting at the differential pressure switch. See
Figs. 32.
■
The air differential pressure orifices should be free of
blockages. If cleaning is required use pressurised air:
Orifices on pressure switch (See Fig.32)
-- Remove respective orifice from switch.
-- Hold up to light, if blocked clean the orifice.
-- Ensure orifices are securely pushed backed into
proper location on switch.
FIG. 31
Servicing the differential air pressure switch:
■
The differential pressure switch is non- adjustable. If
the switch does not make the circuit after inspection of
tubes and orifices, it must be replaced.
■
Do not jumper the switch. Doing so will cause lock-out
of the heater’s ignition control.
FIG. 32
AIR DIFFERENTIAL PRESSURE SWITCH,
TUBING & PRESSURE ORIFICES
COPPER PRESSURE TUBE
NUTS
ORIFICES
BLUE
GREEN
TUBE
FITTING