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CHECKING
AND
ADJUSTING
UNIT
Unless
the gas
input
to the
_rner
is
_dthin
the
required
limits,
the
unit
cannot
l_oduce
'he
heat
intended.
The
input
to the
unit
shall
not
exceed
izs rated
INPUT
BTU/HR
(table
page
3).
If it
is not correct,
_]le pressure
r_ulator
will
have
to
be
adjusted
and/or
€he
orifices
may
have
to' be
changed,
A tapped
opening
is
provided
in
the
Gas
Va]ve
to facilitate
measuring
the
manifold
gas
pre_m-e.
A U-tube
manometer
having
a scale
range
from
0 to 12 inches
of water
should
be
_
_r
this
measuron_ent.
The
mare/old
pressure
must
be
measured
with
the burners
and _lot
operating.
The manifold
pressure
is set in accordance
with
the
following
list for
various
typea
of gases
LT_E
OF
GAS
•
M_tAq_3LD
PRESSURE
{
I mce OF
J
small
varia_
in g_
flow
shmlld
ke made
by means o_ the gas pressure regulatA_
i_tj_t.
In no cas* should the final manifold
lzressure
vary
more
than plus or minuJ
03 inches water column
from
the above
specif_d
pressures_'
_:_
Any major changes in the flow must be n_le
by
ehangi_
the _
of the burner orifice. T}_ b_mer
orifices
_ed
with
the
unit
are listed
In the
following
table
f_" t_
various
gas_..
FURNACE
BTU/HI_
75,000
I_,000
_,000
150.000
175.000
BURNER ORIFICESPUDS FURNI_HI_
i
ORIFICE
DRILL
SIZE DJd.S.
NO.
OF
ORIFICES
3
4
5
5
0.65-0.69 SP GR.
NATURAL
33
(.113)
34
(11110)
35
(.1100) '
38
(.1015)
34
(.1110)
zsoo BTU
PROPANE
so (.ow)
so (.o_o)
5O (.O7O)
so (.o_o)
32OO
BUTANE
"
51 (.o6D
51 (.O67)
51 (.O67)
_1 (.061)
* For Model No_. of Units as listed.above
re,or to Table. page 3.
CHECK GASINPUT (C_.JTY GASE._ONLY)
The
inlet
to the unit,
may
be
checked
by
using
the
gas meter
as follows:
1. Turn off all other gas appliances
cormeeted
to
the meter.
2.
Start the heating
uni_ -- and set the thermo.
_tat so that the main burner is ,m.
3.
Wazch
the
"smallest"
_
on the
&,as mater
(the one whose
hand
is r_'olving
fastest).
Count
(with
the second
land
of a watch
or clock)
the
exact number of seconds it takes forthe hand of this
dial to make one _ul]revolution.
4.
Now
look
to see
what
one
revolu_on
of this
band
indicates,
as marked
on
the
dial.
On some
•meters
the "smartest"
dial
will
read
"ONE
FOOT,"
or it m_ght reed "QUARTE_
FOOT,"
or "5 FEET."
• A typical
meter
is i|]ustrated
here.
A
TYPICAL
CITY
GAS
METER
EET
5.
Use
put,
If
the
_able
below
to determine
your
gin; in-
your_
is • ONE
FOOT
dial, _nFAy
re_d
the
AC_JA_ G_$ INPOT -- IW¢_, FT, PER H.q.
FOR OFE REVOLU_IO,V OF ,40H_ FO0_,- O La£
I
]tl_
1|
IT
|
|11
I
4[4
,
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,,
..[I.1,.
I ,,,.
18
3_
20
124
4S
'IB
IS
_'rf
[I
30
I
IZO
4"/
11_
14
287
IJ 31
i
II_
48
T5
IS
22S
33
10_
$0
|'/
_'|1
34
I0_
61
"
$
'
18
200
_$
|0:1
- 52
._
'
19
11_
II
Is
I
leO
I
£1 .
$8
zo
160
I!
31
I
87
,
$4
65
zl
lVl
II
30
I
85
J
$$
.
0&$.
:'2
164
)l
3S
I
$2
[
_
_4
28
1BY
II
4o
I
SO
$'t
a:l
24
15o
II
41
|
18
SO ,
oz
_5
144
II
41
I
g6
_
• ' 61.
"Input"
_
that corresponds
to the "See..'-'. (sec-
onds)
that you l_ve
counted.
I|
your_ls_-g
I"WO
FEET
dial,
multiply
this figure
hy 2; if" it's a YlVE
FEET
diM, multiply
by 5, Lf it's a HALF
FOO'I
diaI,
divide
by
2; and
if it's a QUA_
FOOT
dial,
dlvide
by 4,
The figure
you
arrive
at when
ym've
don_ this _rree_y
will be your
_ct_l
ff_
i_u_
cu,.. fl:, per h_'.
"
;/._-_.; ,".
it by the BTU
rating
of your
g_
(_
to_| to" y¢ U by
your
Gas
Company).
This
result
will
_
the eeht_.
BTU!H_
input
of your
.h_, ring unit--end,
as $_tat-
ed above,
it zhould
be within
5% of the :stedaL
G.
As Input
e_ *he unit.
zzg-d
IZ/BOd
ELS-Z
_E88_Z_L9+
.b:i_ H_lYJS_ld31-u_d
u_0£:80 SS-SL-.sr
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