Unit installation
14
Size the main gas line in accordance with Table III. (See last
page in manual). The figures shown are for straight lengths of
pipe at 0.5 in. W.C. pressure drop, which is considered normal for
low pressure systems. Note: Fittings such as elbows, tees and
line regulators will add to the pipe pressure drop. Also refer to the
latest version of the National Fuel Gas Code. For Canadian
installations consult Canadian Installation Code CAN/CGA
B149.1 or .2.
TABLE lll - GAS SUPPLY LINE SIZES (IN INCHES)*
MAXIMUM CAPACITY OF PIPE IN
CUBIC FEET PER HOUR
HTGNEL
NI
TEEF
)SEHCNI(SEZISEPIPNORILANIMON
"2/1"4/3"1"4/11"2/11"2"2/12"3"4
01
57106308600410012069300360001100032
02
021052564059064105720634007700851
03
79002573077081100220253052600821
04
2807102306609900910003003500901
05
371515820850090861056205740079
06
668310620350180251004200340088
07
165210420940570041052200930018
08
758110220640960031050200730057
09
350115020340560221059105430027
001
053015910040260511058105230076
521
44395710630550201056105920006
051
0448061523005059005105620055
571
7377541003064058073105420005
002
5327531082034008082108220064
WARNING
THE HEATER IS NOT INTENDED FOR OPERATION AT HIGHER
THAN 14.0" W.C.(3.48 Kpa) - NATURAL GAS, 14.0" W.C. (3.48
Kpa) - PROPANE GAS (1/2 POUND PER SQUARE INCH GAGE-
3.45 Kpa) SUPPLY GAS PRESSURE. EXPOSURE TO HIGHER
SUPPLY PRESSURE MAY CAUSE DAMAGE TO THE GAS VALVE
WHICH COULD RESULT IN FIRE OR EXPLOSION. IF
OVERPRESSURE HAS OCCURRED SUCH AS THROUGH
IMPROPER TESTING OF GAS LINES OR EMERGENCY
MALFUNCTION OF THE SUPPLY SYSTEM, THE GAS VALVE
MUST BE CHECKED FOR SAFE OPERATION. MAKE SURE
THAT THE OUTSIDE VENTS ON THE SUPPLY REGULATORS
AND THE SAFETY VENT VALVES ARE PROTECTED AGAINST
BLOCKAGE. THESE ARE PARTS OF THE GAS SUPPLY
SYSTEM, NOT THE HEATER. VENT BLOCKAGE MAY OCCUR
DURING ICE STORMS.
IT IS IMPORTANT TO GUARD AGAINST GAS VALVE FOULING
FROM CONTAMINANTS IN THE GAS WAYS. SUCH FOULING
MAY CAUSE IMPROPER OPERATION, FIRE OR EXPLOSION.
IF COPPER SUPPLY LINES ARE USED THEY MUST BE
INTERNALLY TINNED AND CERTIFIED FOR GAS SERVICE.
BEFORE ATTACHING THE GAS LINE, BE SURE THAT ALL GAS
PIPE IS CLEAN ON THE INSIDE.
TO TRAP ANY DIRT OR FOREIGN MATERIAL IN THE GAS
SUPPLY LINE, A DIRT LEG (SOMETIMES CALLED SEDIMENT
TRAP OR DRIP LEG) MUST BE INCORPORATED IN THE
PIPING (SEE FIG. 10). THE DIRT LEG MUST BE READILY
ACCESSIBLE AND NOT SUBJECT TO FREEZING
CONDITIONS. INSTALL IN ACCORDANCE WITH
RECOMMENDATIONS OF SERVING GAS SUPPLIERS. REFER
TO THE LATEST VERSION OF THE
NATIONAL FUEL GAS
CODE. For Canadian installations consult Canadian Installation
Code CAN/CGA B149.1 or .2.
To prevent damage, care must be taken not to apply too much
torque when attaching gas supply pipe to gas valve inlet.
Apply joint compounds (pipe dope) sparingly and only to the male
threads of pipe joints. Do not apply compounds to the first two
threads. Use compounds resistant to the action of liquefied
petroleum gases.
GAS PIPING AND DIRT LEG INSTALLATION
FIGURE 10
BEFORE PLACING THE HEATER IN OPERATION, CHECK FOR
GAS LEAKAGE. Use soap and water solution or other material
acceptable for the purpose in locating the leaks. DO NOT USE
MATCHES, CANDLES, FLAME OR OTHER SOURCES OF
IGNITION FOR THIS PURPOSE.
DISCONNECT THE HEATER AND ITS MANUAL GAS SHUTOFF
VALVE FROM THE GAS SUPPLY PIPING SYSTEM DURING ANY
SUPPLY PRESSURE TESTING EXCEEDING 1/2 PSIG (3.45
Kpa). GAS SUPPLY LINE MUST BE CAPPED WHEN
DISCONNECTED FROM THE HEATER FOR TEST PRESSURES
OF 1/2 PSIG (3.45 Kpa) OR LESS. THE APPLIANCE NEED NOT
BE DISCONNECTED, BUT MUST BE ISOLATED FROM THE
SUPPLY PRESSURE TEST BY CLOSING THE MANUAL GAS
SHUTOFF VALVE.
PURGING
Gas line purging is required with new piping or systems in which
air has entered.
CAUTION
PURGING SHOULD BE PERFORMED BY PERSONS
EXPERIENCED IN THIS TYPE GAS SERVICE. TO AVOID RISK
OF FIRE OR EXPLOSION, PURGE DISCHARGE MUST NOT
ENTER CONFINED AREAS OR SPACES WHERE IGNITION
CAN OCCUR. THE AREA MUST BE WELL VENTILATED AND
ALL SOURCES OF IGNITION MUST BE INACTIVATED OR
REMOVED.