Dunkirk Q95M-200 Modulating Condensing Boiler - Manual (Page 17)

9 - GAS SUPPLY PIPING
CAUTION
WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use
any phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow gas supplier’s
instructions.
• If you cannot reach your gas supplier, call the fire
department.
!
9.1 Check Gas Supply
TABLE 6: GAS SUPPLY PRESSURE
Natural Gas 4” min. w.c. 10” max. w.c.
LP Gas 10” min. w.c. 14” max. w.c.
Check line pressure while unit is running in high fire mode.
TABLE 7: GAS PIPING SIZES
Natural Gas
Pipe Length
Pipe Capacity - BTU/Hr. Input Includes Fittings
½” ¾” 1” 1¼”
20’ 92,000 190,000 350,000 625,000
40’ 63,000 130,000 245,000 445,000
60’ 50,000 105,000 195,000 365,000
LP Gas
Pipe Length
Pipe Capacity - BTU/Hr. Input Includes Fittings
Copper Tubing (O.D.)
Iron Pipe
⅝” ¾” ½” ¾”
20’ 131,000 216,000 189,000 393,000
40’ 90,000 145,000 129,000 267,000
60’ 72,000 121,000 103,000 217,000
The length of pipe or tubing should be measured from the gas meter or
propane second stage regulator.
• Gas pipe to boiler must be correct size for length of
run and total Btuh input of all gas utilization equipment
connected to it. See Table 7 for proper size.
• Verify your gas line complies with local codes and gas
company requirements.
• Disconnect boiler and its individual shutoff valve from
gas supply piping system during any pressure testing of
system at test pressures in excess of ½ psig (3.5kPa).
• Isolate boiler from gas supply piping system by closing
its manual shutoff valve during any pressure testing of
gas supply piping system at test pressures equal to or
less than ½ psig (3.5kPa).
• For proper boiler operation line pressure should be
within minimum and maximum values in Table 6.
• Gas line enters boiler through left side panel. See page
2 Dimensions and Figure 10.
Boiler is equipped with ½” NPT connection on gas valve for
supply piping and ½” NPT ball valve for manual shut off.
Following rules apply:
1. Use only those piping materials and joining methods
listed as acceptable by the authority having jurisdiction,
or in the absence of such requirements,
• United States - National Fuel Gas Code, ANSI
Z223.1/NFPA 54.
• Canada - Natural Gas and Propane Installation Code,
CAN/CSA B149.1.
2. Use pipe joint compound suitable for liquefied
petroleum gas on male threads only.
3. Refer to Figure 10 for general layout, which shows
basic fittings needed. As shipped, gas line enters
boiler through right side, as an option, it can be routed
through either rear or left side panel.
4. Use ground joint unions.
5. Install sediment trap upstream of gas controls.
6. Use two pipe wrenches when making connection to the
gas valve to keep it from turning.
7. Install manual shutoff valve in vertical pipe about 5’
above floor outside boiler jacket in addition to shutoff
valve supplied with boiler.
8. Tighten all joints securely.
9. Propane gas connections should only be made by
licensed propane installer.
10. Two stage regulation should be used by propane
installer.
11. Propane gas piping should be checked by propane
installer.
9.2 Connecting Gas Piping
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