Operating instructions
2. In Canada, vent damper must be attached directly to flue outlet collar, with the exception of 2-section boiler where the 3-in. to 4-in. adapter
is supplied with vent damper. No other interconnecting pieces are allowed between boiler and vent damper.
3. In Canada, vent dampers are not an option. Boilers are either factory built for use with a vent damper and vent damper is supplied with
boiler, or they are factory built for use without a vent damper. In the second case, a vent damper cannot be installed later.
GAS SUPPLY PIPING
PROCEDURE 1—CHECKING GAS SUPPLY
The gas pipe to boiler must be the correct size for length of run and total Btuh input of all gas utilization equipment connected to it. See Table
5 for proper size. Be sure gas line complies with local codes and gas company requirements.
The boiler and its individual shutoff valve must be disconnected from gas supply piping system during any pressure testing of gas supply piping
system at test pressures in excess of 0.5 psig (3.5 kPa).
The boiler must be isolated from gas supply piping system by closing its individual manual shutoff valve during any pressure testing of gas supply
piping system at test pressures equal to or less than 0.5 psig (3.5 kPa).
PROCEDURE 2—CONNECTING GAS PIPING
Refer to Fig. 8 for general layout at boiler. It shows basic fittings needed. The gas line enters boiler from right side.
The 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, by the NFGC ANSI Z223.1-2002. In Canada, follow the CAN/CGA B149.1 and .2 Installation Codes for Gas Burning
Appliances and Equipment.
2. Use pipe joint compound suitable for natural and propane gas on male threads only.
3. Use ground joint unions.
4. Install a sediment trap upstream of gas controls.
5. Use 2 pipe wrenches when making connection to gas valve to keep it from turning.
6. Install a manual shutoff valve in vertical pipe about 5 ft above floor.
7. Tighten all joints securely.
8. Propane gas connections should only be made by a licensed propane installer.
9. Two-stage regulation should be used by propane installer.
10. Propane gas piping should be checked by propane installer.
PROCEDURE 3—CHECKING GAS PIPING
Upon completion of piping, check immediately for gas leaks. Open the manual shutoff valve. Test for leaks by applying soap suds (or a liquid
detergent) to each joint. Bubbles forming indicate a leak. CORRECT EVEN THE SMALLEST LEAK AT ONCE.
WARNING: Never use a match or open flame to test for leaks. Use a soap-and-water solution. A failure to follow this
warning could result in fire, explosion, personal injury, or death.
ELECTRICAL WIRING
See Fig. 9 and 10 for wiring diagrams for the various models.
Table 5—Gas Pipe Sizes
NATURAL GAS
Length
of Pipe
(Ft)
Pipe Capacity—Btuh Input
Includes Fittings
1/2 in. 3/4 in. 1 in. 1-1/4 in.
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
PROPANE GAS
Length
of Pipe
Pipe Capacity—Btuh Input
Includes Fittings
(Ft)
Copper Tubing* Iron Pipe
5/8 in. 3/4 in. 1/2 in. 3/4 in.
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
* Outside diameter.
NOTE: The length of pipe or tubing shown should be measured from gas meter or
propane second-stage regulator.
Fig. 8—Gas Piping at Boiler
A95148
MANIFOLD
AUTOMATIC
GAS VALVE
MANUAL
SHUTOFF
VALVE
SEDIMENT TRAP
FLOOR LINE
GROUND JOINT
UNION
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