Gas Supply Piping - Dunkirk Q95M-200 Installation Manual

or below, electric meters, gas meters, regula-
tors, and relief equipment.
If multiple terminations are used, there must be
a minimum of 12" between the exhaust of one
termination and the air intake of the next termi-
nation. See Figures 1-3 for illustrations.
INSTALLATION
IMPORTANT: When transitioning from CPVC to
PVC it is recommended to use Weld-On CPVC 724
or other cement approved for CPVC and PVC.
1. Attach combustion air intake piping to sup-
plied 2" PVC Intake Connector. Attach vent pip-
ing to furnished 2" CPVC vent pipe.
NOTE: All pipe joints are to be water tight.
2. Working from the boiler to the outside, cut
pipe to required length(s).
3. Deburr inside and outside of pipe.
4. Chamfer outside edge of pipe for better distri-
bution of primer and cement.
5. Clean and dry all surfaces to be joined.
6. Check dry fit of pipe and mark insertion depth
on pipe.
NOTE: It is recommended that all pipes be cut, prepared, and
pre-assembled before permanently cementing any joint.
CHECK GAS SUPPLY
The gas pipe to your boiler must be the correct size
for the length of run and for the total BTU per hour
input of all gas utilization equipment connected to
it. See Table 4 at right for proper size. Be sure your
gas line complies with local codes and gas com-
pany requirements.
The boiler and its individual shutoff valve must be
disconnected from the gas supply piping system
during any pressure testing of that system at test
pressures in excess of ½ psig (3.5kPa).
The boiler must be isolated from the gas supply pip-
ing system by closing its individual manual shutoff
valve during any pressure testing of the gas supply
piping system at test pressures equal to or greater
than ½ psig (3.5kPa).
7. After pipes have been cut and pre-assem-
bled, apply cement primer to pipe fitting socket
and end of pipe to insertion mark. Quickly apply
approved cement to end of pipe and fitting sock-
et (over primer). Apply cement in light, uniform
coat on the inside of socket to prevent buildup of
excess cement. Apply second coat.
NOTE: Primer and cement will discolor jacket. Take pre-
cautions to protect jacket while cementing vent pipe.
8. While cement is still wet, insert pipe into sock-
et with a ¼ turn twist. Be sure pipe is fully in-
serted into fitting socket.
9. Wipe excess cement from joint. A continuous
bead of cement will be visible around perimeter
of a properly made joint.
10. Handle pipe joint carefully until cement sets.
11. Support combustion air and vent piping a
minimum of every 5' using pre-formed metal
hanging straps. Support combustion air and
vent piping so no weight is resting on the boiler
jacket. Do not rigidly support pipes. Allow move-
ment due to expansion and contraction.
12. Slope combustion air and vent pipes toward
boiler a minimum of ¼" per linear foot with no
sags between hangers.
13. Use appropriate methods to seal open-
ings where vent and combustion air pipes pass
through roof or side wall.
IX - GAS SUPPLY PIPING
TABLE 4: GAS PIPING SIZES
Pipe
Length
20'
40'
60'
Pipe
Length
20'
40'
60'
The length of pipe or tubing should be measured from the gas
meter or propane second stage regulator.
13
Natural Gas
Pipe Capacity - BTU/Hr. Input Includes Fittings
½" ¾"
92,000 190,000 350,000
63,000 130,000 245,000
50,000 105,000 195,000
LP Gas
Pipe Capacity - BTU/Hr. Input Includes Fittings
Copper Tubing (O.D.)
⅝" ¾"
131,000 216,000 189,000
90,000 145,000 129,000
72,000 121,000 103,000
1" 1¼"
625,000
445,000
365,000
Iron Pipe
½" ¾"
393,000
267,000
217,000