andrews L32/143 Installation Manual, Operation And Service Manual page 48

FAULT FINDING
FAULT ACTION
Check burner primary air shutter settings are correct to
LOUD WHISTLING
dimensions given below. If not reset to dimensions given below.
NOISE
If the whistling persists continue to reduce the settings until the
whistling stops.
Heater Model Air Shutter Dimension A in mm
L32/143
L65/169
L81/251
L62/309
L54/399
LOCKING PIN
BURNER AIR SHUTTER
8
5
10
8
8
A
INJECTOR
SECTION 8
PERMANENT
PILOT MODELS
HI-FLO RANGES
43