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Instructions for Installation (cont'd)
Gas Piping
VENTING THROUGH A ROOF (cont'd)
AWARNING
Make sure the gas supplied
is the same type listed
75 GALLON 70,000 AND 75,000 BTU/HR
on the model rating plate. The inlet gas pressure
MODELS ONLY--OPTIONAL 4" VENT PIPING
must not exceed 10.5 in. water column (2.6 kPa) for
natural
gas or 13 in. water
column (3.2 kPa) for
4" DIA.VENT
NUMBER OF 90 ° DEG.
Propane (L.R) gas. The minimum inlet gas pressure
MAX. LENGTH (FT.)
ELBOWS*
listed on the model rating plate is for the purpose
110
1
of input adjustment.
105
2
100
3
9s
4
f
WARN,NG 1
90
5
IIf thegas
control_cted
to pressures I
85
6
lexceeding
1/2pound per square inch (3.5kPa), the I
Idamage
to the gas control valve could result in a l
I fire or explosion from leakin 9 gas.
I
ALL 40 AND 50 GALLON 40,000 BTU/HR
MODELS ONLY
3" DIA.VENT
NUMBER OF 90 ° DEG.
[
AWARNING
MAX. LENGTH (FT.)
ELBOWS*
_lf the maingas
line shutoff serving all gas appli-
115
1
lances is used, also turn "off" the gas at each appli-
110
2
lance.
Leave all gas appliances
shut off until
the
105
3
[water
heater installation
is complete.
100
4
95
5
90
6
A gas fine of sufficient size must be run to the water heater.
Consult the latest edition of National Fuel Gas Code ANSI
ALL 40 AND 50 GALLON 40,000 BTU/HR MODELS --
Z223.1, also referred to as NFPA 54 and the gas company
OPTIONAL 2" VENT PIPING
concerning pipe size.
2" DIA.VENT
NUMBER OF 90 ° DEG.
There must be:
MAX. LENGTH (FT.)
ELBOWS*
• A readily accessible manual shut offvalve in the gas supply
50
1
line serving the water heater, and
45
2
• A drip leg (sediment trap) ahead of the gas control valve to
40
3
heIp prevent dirt and foreign materials from entering the
35
4
gas control valve.
30
5
• A flexible gas connector or a ground joint union between the
25
6
shutoffvalve and control valve to permit servicing of the unit.
NOTE: Two 45* elbows are equivalent to one 90*elbow.
Be sure to check all the gas piping for leaks before lighting the
One 90*elbow equals 5 feet of equivalent vent length,
water heater. Use a soapy water solution, not a match or open
flame. Rinse off soapy solution and wipe dry.
Standard Models are for installation up to 3,300 feet above
sea level.
High Altitude Models are for installation from 3,300 to
5,500 feet above sea level.
Ifa standard model is installed above 3,300 feet or a high alti-
tude model is installed above 5,500 feet, the input rating must
be reduced at the rate of 4 percent for each 1,000 feet above
sea level. Contact your local gas utility for further information.
27
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