Bryan Boilers Forced Draft Steam Boilers ユーザーズマニュアル

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
The installation must conform completely to the 
requirements of the authority having jurisdiction, 
or in the absence of such, requirements shall 
conform in the U.S. to the current National Fuel 
Gas Code, ANSI Z223.1-1984, or in Canada to 
the current Installation Code for Gas Burning 
Appliances and Equipment (CAN/CGA B149.1-
M91), or Oil Burning Equipment (CSA B139-
M91), and applicable regional regulations for the 
class; which should be followed carefully in all 
cases.  

Drip leg must be installed on gas supply piping. 
 
Consult the local gas utility company for 
inspection and authorization of all gas supply 
piping and flue connections. 
 
The regulator vent line must be vented to outside 
of building on any boiler equipment with electric 
gas pilot ignition. 

 
1.5.1 DRIP LEG 
A drip leg or sediment trap must be installed in 
the gas supply line. See Fig. 1.5A. The gas line 
must be connected to a supply main at least as 
large as the gas train connection at the boiler. 
This connection should be made with a union so 
that the boiler gas train components and burner 
may be easily removed, if necessary, for service. 
 
1.5.2 GAS PIPING LEAK TEST 
After completion of the gas piping hookup, the 
installation must be checked for leaks, using a 
soap and water solution. Disconnect the boiler 
and gas train from the gas supply piping during 
any pressure testing of the gas supply system. 

 
1.5.3 VENTING OF GAS TRAIN COMPONENTS 
Gas pressure regulator - The regulator must be 
vented to the outside air, using minimum 1/4" 
tubing or pipe. The vent line should terminate in a 
downward direction to be free of restriction. 
 
Diaphragm gas valves (V48A or V88A) - The vent 
line off of these gas valves must be vented to 
outdoors, the same as the regulator. 
 
Normally open vent valves - These valves must 
be piped to outdoors using pipe no smaller than 
that of the valve. 
Gas pressure switches - Vent these switches to 
outdoors using a minimum of 1/4" tubing or 
piping. 

 

 

 
 

FIGURE 1.5A: GAS BURNER CONNECTION 

 
NOTE: USE PIPE COMPOUND, WHICH IS RESISTANT TO THE ACTION OF LIQUID PETROLEUM 
GAS. DO NOT USE TEFLON TAPE.