AERCO Esteem O&M Manual - Manual (Page 36)

30
Natural Gas
Natural Gas
P
IPE
S
IZING
- N
ATURAL
G
AS
Refer to Table 1 for schedule 40 metallic pipe
length and diameter requirements for natural
gas, based on rated Esteem 399 Low NOx
input (divide by 1,000 to obtain cubic feet per
hour).
• Table 1 is based on Natural Gas with a
specifi c gravity of 0.60 and a pressure
drop through the gas piping of 0.30”w.c..
• - For additional gas piping sizing infor-
mation, refer to ANSI Z223.1. For Canadi-
an installations refer to B149.1 or B149.2.
N
ATURAL
G
AS
S
UPPLY
P
RESSURE
R
EQUIREMENTS
1. Pressure required at the gas valve inlet
supply pressure port:
• Maximum 13”w.c. at flow or no flow con-
ditions to the burner.
• Minimum 5”w.c. during flow conditions
to the burner. Must be verified during
start up and with all other gas applianc-
es operating within the building.
2. Install 100% lockup gas pressure regulator
in the gas supply line if inlet pressure can
exceed 13”w.c at any time. Adjust the lock-
up pressure regulator for 13”w.c maximum.
WARNING!
DO NOT
ADJUST OR ATTEMPT TO MEASURE
GAS VALVE OUTLET PRESSURE
. T
HE GAS VALVE
IS FACTORY
-
SET FOR THE CORRECT OUTLET
PRESSURE
. T
HIS SETTING IS SUITABLE FOR
NATURAL GAS AND PROPANE AND REQUIRES NO
FIELD ADJUSTMENT
. A
TTEMPTS BY THE INSTALL
-
ER TO ADJUST OR MEASURE THE GAS VALVE
OUTLET PRESSURE COULD RESULT IN DAMAGE
TO THE VALVE
,
CAUSING POTENTIAL SEVERE
PERSONAL INJURY
,
DEATH OR SUBSTANTIAL
PROPERTY DAMAGE
.
N
OTICE
The natural gas orifi ce for the Esteem
399 Low NOx is 0.339” (8.6 mm)
Table 1: Gas Piping Sizing - Natural Gas
Length of Pipe in
Feet
Capacity of Schedule 40 Metallic Pipe in Cubic Feet of Natural Gas Per
Hour (based on 0.60 specific gravity, 0.30” w.c. pressure drop)
SCH 40 1/2” 3/4” 1” 1-1/4” 1-1/2”
10 132 278 520 1050 1600
20 92 190 350 730 1100
30 73 152 285 590 890
40 63 130 245 500 760
50 56 115 215 440 670
75 45 93 175 360 545
100 38 79 150 305 460
150 31 64 120 250 380
GF-125