Gas Piping - Slant/Fin SE-70 Installation And Operating Instructions Manual

6
WARNING—DANGER
Once you have begun vent damper installation procedure,
DO NOT restore electric power and gas supply until installa-
tion and inspection have been completed (in order to prevent
the main burners from operating). DO NOT operate the boiler
until the vent damper harness is plugged into vent damper
operator. Failure to observe this warning may create a
hazardous condition that could cause an explosion or
carbon monoxide poisoning.
B. 1. This device must be installed after the boiler draft hood
(between the draft hood outlet and the connector to the
outdoor chimney or vent) as close to the draft hood as
practicable, and without modification of the draft hood or
the vent damper. (See figure 1 and 2.)
2. The inlet size of the vent damper must be the same
nominal trade size as the outlet of the draft hood.
3. This device must be located in a venting system or sec-
tion of a venting system so that it serves only the single
appliance for which it is installed. (See figure 3.)
4. Clearances of not less than 6 inches (152MM) must be
maintained from combustible materials, with provisions
for service access.
C. AFTER INSTALLATION:
1. Operate system through two complete cycles to check for
opening and closing in proper sequence, and proper
burner operation. DAMPER MUST BE IN OPEN POSI-
TION WHEN BOILER MAIN BURNERS ARE
OPERATING.
2. Perform installation checks as required by ANSI specifi-
cation Z21.66. (See Vent Damper Instructions.)
3. Check the troubleshooting section if problems arise with
the installation.

GAS PIPING

A. Local installation codes apply. The pipe joint compound used
on threads must be resistant to the action of liquefied petrole-
um gases.
B. The gas supply line to the boiler should be run directly from
the meter for natural gas or from the fuel tank for L.P. propane
gas. See page 2 for location of union and manual main shutoff
valve that may be specified locally.
Selecting pipe size for natural gas:
1. Measure or estimate the length of piping from the meter to
the installation site.
2. Consult gas supplier for heating value of gas (BTU/cu. ft.).
3. Divide boiler rated input by heating value to find gas flow in
piping (cu. ft. per hour).
4. Use table A to select proper pipe size.
Example: Boiler model SE-175 is to be installed. Distance from
gas meter to the boiler is 20 ft. Heating value of natural gas is
1020 BTU/cu. ft. Select proper pipe size.
Gas flow = 175,000 BTU/hour = 171.5 cu. ft. per hour
1020 BTU/cu.ft.
At 20 ft. length of pipe, match required capacity from Table
A (choose higher capacity, in this case is 190 cu. ft. per
hour). Required pipe size is 3/4".
Improper gas pipe sizing will result in pilot flame outages,
insufficient heat and other installation difficulties. For more
information and also if other appliances are to be attached
to the piping system, see Appendix C of National Fuel Gas
Code ANSI Z223.1-latest edition.
C. The boiler and its gas connection must be leak tested
before placing the boiler in operation. Use liquid soap solu-
tion for all gas leak testing. DO NOT use open flame.
This boiler and its individual shutoff valve must be discon-
nected from the gas supply piping system during any pres-
sure testing of that system at test pressures in excess of
1/2 PSIG. This boiler must be isolated from the gas supply
piping system by closing its individual manual shutoff valve
during any pressure testing of the gas supply piping sys-
tem at test pressures equal to or less than 1/2 PSIG. This
boiler must be isolated from the gas supply piping system
by closing its individual manual shutoff valve during any
pressure testing of the gas supply piping system at test
pressures equal to or less than 1/2 PSIG.
D. All gas piping used should be inspected thoroughly for
cleanliness before makeup. A sediment trap must be pro-
vided, as illustrated on page 2.
E. The minimum and maximum gas supply pressure (at the
inlet of gas valve) are shown on the boiler rating plate for
the type of gas used. Gas supply pressure should never be
less than minimum or more than maximum pressure when
the boiler or any other appliance is turned on or off.
Table A.
Gas Flow In Piping -- cu. ft. per hr.
Length
Iron Pipe Size (IPS)—inches
of Pipe
in Feet
1/2
10 132 278
20 92 190
30 73 152
40 63 130
50 56 115
60 50 105
70 46
80 43
90 40
100 38
At pressure drop of 0.3 in. water, specific gravity = 0.60.
Sentinel
3/4 1 1-1/4
520 1050
350 730
285 590
245 500
215 440
195 400
96 180 370
90 170 350
84 160 320
79 150 305
1-1/2
1600
1100
890
760
670
610
560
530
490
460