Install Instructions
6-580.5
7
INSTALLATION
Figure 7.1 - Recommended Sediment Trap/Manual
Shut-off Valve Installation for Gas Connection
GAS
SUPPLY LINE
GAS
SUPPLY LINE
GROUND
JOINT
UNION
W/ BRASS
SEAT
MANUAL GAS
SHUT-OFF VALVE
3"
MIN.
SEDIMENT
TRAP
PLUGGED
1/8" NPT TEST
GAGE CONNECTION
TO
CONTROLS
➀
➀ Manual shut-off valve is in the “OFF” position when handle is perpendicular
to pipe.
IMPORTANT
To prevent premature heat exchanger failure, the input to
the appliance, as indicated on the serial plate, must not
exceed the rated input by more than 5%.
1. Installation of piping must conform with local building
codes, or in the absence of local codes, with the National
Fuel Gas Code, ANSI Z223.1 (NFPA 54) - Latest Edition.
In Canada, installation must be in accordance with CAN/CGA-
B149.1 for natural gas units and CAN/CGA-B149.2 for
propane units.
2. Piping to units should conform with local and national
requirements for type and volume of gas handled, and
pressure drop allowed in the line. Refer to Table 7.1 to
determine the cubic feet per hour (cfh) for the type of gas
and size of unit to be installed. Using this cfh value and
the length of pipe necessary, determine the pipe diameter
from Table 7.2. Where several units are served by the
same main, the total capacity, cfh and length of main must
be considered. Avoid pipe sizes smaller than 1/2". Table
7.1 allows for a 0.3" W.C. pressure drop in the supply
pressure from the building main to the unit. The inlet
pressure to the unit must be 6-7" W.C. for natural gas and
11-14" W.C. for propane gas. When sizing the inlet gas
pipe diameter, make sure that the unit supply pressure
can be met after the 0.3" W.C. has been subtracted. If the
0.3" W.C. pressure drop is too high, refer to the Gas
Engineer’s Handbook for other gas pipe capacities.
3. Install a ground joint union with brass seat and a manual
shut-off valve adjacent to the unit for emergency shut-off
and easy servicing of controls, including a 1/8" NPT
plugged tapping accessible for test gauge connection
(see Figure 7.1).
4. Provide a sediment trap before each unit and in the line
where low spots cannot be avoided (see Figure 7.1).
5. When Pressure/Leak testing, pressures above 14" W.C.
(1/2 psi), close the field installed shut-off valve, disconnect
the appliance and its combination gas control from the
gas supply line, and plug the supply line before testing.
When testing pressures 14" W.C. (1/2 psi) or below, close
the manual shut-off valve on the appliance before testing.
WARNING
1. All field gas piping must be pressure/leak tested prior to
operation. Never use an open flame. Use a soap solution
or equivalent for testing.
2. Gas pressure to appliance controls must never exceed 14"
W.C. (1/2 psi).
3. To reduce the opportunity for condensation, the minimum
sea level input to the appliance, as indicated on the serial
plate, must not be less than 5% below the rated input, or 5%
below the minimum rated input of dual rated units.
cAUTION
Purging of air from gas supply line should be performed as
described in ANSI Z223.1 - latest edition “National Fuel Gas
Code”, or in Canada in CAN/CGA-B149 codes.
Gas Connections
Pipe
Length (ft)
Natural Gas
1/2” 3/4” 1” 1-1/4” 1-1/2” 2”
10 132 278 520 1050 1600 3050
20 92 190 350 730 1100 2100
30 73 152 285 590 890 1650
40 63 130 245 500 760 1450
50 56 115 215 440 670 1270
60 50 105 195 400 610 1150
70 46 96 180 370 560 1050
80 43 90 170 350 530 930
100 38 79 150 305 460 870
125 34 72 130 275 410 780
150 31 64 120 250 380 710
Table 7.2 - Gas Pipe Capacities - Natural Gas ➀ ➁
➀ Capacities in Cubic Feet per Hour through Schedule 40 pipe with maximum
0.3"W.C. pressure drop with up to 14"W.C. gas pressure. Specific graivity is 0.60
for Natural gas and 1.50 for Propane gas.
➁ For Pipe Capacity with Propane Gas, divide Natural gas capacity by 1.6. Example:
What is the propane gas pipe capacity for 60 feet of 1-1/4" pipe? The Natural gas
capacity is 400 CFH. Divide by 1.6 to get 250 CFH for Propane gas.
Table 7.1 - Manifold Pressure & Gas Consumption ➀
Natural Propane
BTU/Cu. Ft. 1050 2500 No. of
Model Specific Gravity 0.60 1.53 Orifices
Manifold Pressure In. W.C. 3.5 10.0
CFH 138.1 58.0
Gal/Hr. Propane – 1.64 2
Orifice Drill Size 21 39
CFH 166.7 70.0
Gal/Hr. Propane – 1.86 3
Orifice Drill Size 28 43
CFH 190.5 80.0
Gal/Hr. Propane – 2.19 3
Orifice Drill Size 25 42
CFH 238.1 100.0
Gal/Hr. Propane – 2.74 3
Orifice Drill Size 18 36
CFH 285.7 120.0
Gal/Hr. Propane – 3.29 4
Orifice Drill Size 21 39
CFH 333.3 140.0
Gal/Hr. Propane – 3.84 5
Orifice Drill Size 23 41
CFH 381.0 160.0
PDP 400 Gal/Hr. Propane – 4.38 6
Orifice Drill Size 25 42
PDP 150
BDP 150
PDP 175
BDP 175
PDP 200
BDP 200
PDP 250
BDP 250
PDP 300
BDP 300
PDP 350
BDP 350