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R. BURNER PILOT SYSTEM
The MegaStar™ incorporates a gas pilot with induced air (see Figure 18). The pilot is detected
by the main burner UV scanner which is factory mounted and wired. The pilot is properly installed
as delivered and should not need to be moved or adjusted. Note, UV scanner is shipped loose.
1. Before connecting to the pilot assembly gas line, the gas line should be purged to remove any
dirt. Pipe the pilot gas supply line to the inlet of the pilot gas shutoff valve and check for leaks.
Size the pilot gas supply line to avoid excessive pressure drops. For pilot gas supply
lines up to 25 ft (7.6m), use 1/2 NPT (DN 15) or larger piping.
Constant gas pressures ranging from 15 psig (1.03 bar) minimum to 25 psig (1.72 bar)
2.
maximum must be available at the inlet of the Hauck gas pilot manifold. Pilot capacity
should not exceed 150,000 Btu/hr (44kW).
3. The spark wire gap is factory set at 1/8" (3mm). This gap can be changed by carefully
removing the pilot internals. Bend the spark wire to adjust, reinsert, and check the gap.
For field adjustment, a U.S. 5¢ coin with 0.08" (2mm) thickness can be used as a
gauge for adjusting the spark gap.
4. Complete the initial pilot adjustment of the air shutter as follows (see Figure 18):
a. Loosen, but do not remove, the locking thumbscrew.
b. Adjust the air shutter to approximately 1/4" (6.4mm) gap opening.
c. Securely tighten the locking thumbscrew.
d. Slowly open the gas flow valve and light the pilot by means of electric ignition.
The pilot ignition transformer can cause an electric shock - use care around
the ignition cable. When test firing the pilot, leave pilot gas on briefly. If pilot
does not light quickly, shut it off and re-purge before attempting to relight.
Figure 18. Pilot Manifold Detail
CAUTION
Page 34
MS-9
W9003
(NOT TO SCALE)
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