Gas Supply Piping - Dunkirk Q95M-200 Installation, Operation & Maintanance Manual

NOTE: It is recommended that all pipes be cut, prepared,
and pre-assembled before permanently cementing any
joint.
7. After pipes have been cut and pre-assembled, apply cement
primer to pipe fitting socket and end of pipe to insertion mark.
Quickly apply approved cement to end of pipe and fitting
socket (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.
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 equip-
ment connected to it. See Table 4 for proper size. Be sure your gas
line complies with local codes and gas company 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 piping system by
closing its individual manual shutoff valve during any pressure
TABLE 4: GAS PIPING SIZES
Natural Gas
Pipe Capacity - BTU/Hr. Input Includes Fittings
Pipe Length
½"
20' 92,000
40' 63,000
60' 50,000
Pipe Capacity - BTU/Hr. Input Includes Fittings
Pipe Length Copper Tubing (O.D.)
⅝"
20' 131,000
40' 90,000
60' 72,000
The length of pipe or tubing should be measured from the gas meter or
propane second stage regulator.
viii - combustion air and vent pipe
NOTICE
NOTICE
iX - Gas supply pipinG
¾" 1"
190,000 350,000 625,000
130,000 245,000 445,000
105,000 195,000 365,000
LP Gas
Iron Pipe
¾" ½"
216,000 189,000 393,000
145,000 129,000 267,000
121,000 103,000 217,000
8. While cement is still wet, insert pipe into socket with a ¼ turn
twist. Be sure pipe is fully inserted 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
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 movement due to expan-
sion and contraction.
Slope combustion air and vent pipes toward boiler a mini-
12.
mum of ¼" per linear foot with no sags between hangers.
Use appropriate methods to seal openings where vent and
13.
combustion air pipes pass through roof or side wall.
testing of the gas supply piping system at test pressures equal to or
greater than ½ psig (3.5kPa).
In order for proper operation of the boiler, it is recommended that
the line pressure be within the minimum and maximum values in
Table 5.
TABLE 5: GAS SUPPLY PRESSURE
Natural Gas
LP Gas
Check line pressure while unit is running in high fire mode.
1¼"
connecting the Gas piping
Refer to Figure 9 for the general layout at the boiler, which
shows the basic fittings you will need. As shipped, the gas line
enters the boiler through the right side but, as an option, it can
be routed through either the rear or left side panel.
¾"
14
4" min. w.c. 10" max. w.c.
10" min. w.c. 14" max. w.c.
5'