S
ERIES
XT I
NSTALLATION
, O
PERATION
AND
S
ERVICE
M
ANUAL
56
FIGURE 29: Midco HMA-2A Burner
1
8
.1 Direct Fired Burner I
g
nition
The b
u
rner that is
u
sed in the Weather-Rite LLC
u
nit
is eq
u
ipped
w
ith a pilot assembly. The pilot assembly
consists of a pilot gas t
u
be, spark electrode or rod
and a flame rod
w
ith gro
u
nding assembly. For proper
ignition the spark rod m
u
st be adj
u
sted correctly. A
high
v
oltage arc is generated bet
w
een the spark rod
and the pilot gas t
u
be. The gas flo
w
ing o
u
t the ports
in the pilot gas t
u
be is ignited by this arc. The arc
w
ill
be a brilliant electric bl
u
e in color.
FIGURE 30: Spark Rod Dimensions
The gas s
u
pplied to the pilot gas t
u
be sho
u
ld be 3 1/
2"
w
c for nat
u
ral gas and bet
w
een 9 to 11"
w
c for
propane or LP. The difference bet
w
een the t
w
o f
u
els
is that a restricting orifice is installed in the propane
or LP pilot gas t
u
be. The pilot assembly can be
u
sed
on propane or LP
w
itho
u
t an orifice, if this is the case
then the press
u
re for LP is 2.0"
w
.c. Ignition
w
ill take
place
w
ith the introd
u
ction of gas to the pilot gas
t
u
be. The pilot flame
w
ill be mostly bl
u
e in color
w
ith
streaks of yello
w
. The flame size
w
ill be ro
u
ghly 2" in
diameter. The flame m
u
st be steady and consistent
in size.
B
C
E
D
A
WARNING:
the ignition system on the air handler generates bet
w
een 6,000 to 10,000
v
olts.
A
B
C
D
E
in
2.940
0.125
0.125
1.881
0.633
cm
7.468
0.318
0.318
4.778
1.608
Summary of Contents for XT112
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