Gas Supply Piping - Carrier BW9 Series Installation Instructions Manual

STEP 6 —Gas Supply Piping
CHECK GAS SUPPLY
The gas pipe to your boiler must be the correct size for the length
of run and for the total BTU per hour input of all gas utilization
equipment connected to it. See Table 3 for the proper size. Be
sure your gas line complies with local codes and gas company
requirements.
The boiler and its individual shutoff valve must be disconnected
from the gas supply piping system during any pressure testing of
that system at test pressures in excess of 1/2 psig (3.5kPa).
The 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 greater than 1/2 psig (3.5kPa).
Natural Gas
Max. Gas Supply
10" w.c.
Pressure
Min. Gas Supply
4" w.c.
Pressure
NOTE: Check gas supply line pressure with all gas appliances
running
CONNECTING THE GAS PIPING
Refer to Fig. 14 for the general layout at the boiler, which shows
the basic fittings you will need. The gas line enters the boiler
through the left side panel.
The boiler is equipped with a 1/2" NPT connection on the gas
valve for supply piping and 1/2" NPT ball cock for manual
shutoff. 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 National Fuel Gas
Code NFPA 54- -2002/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 liquefied petroleum
gas on male threads only.
3. Use ground joint unions.
4. Install a sediment trap upstream of gas controls.
5. Use two pipe wrenches when making the connection to
the gas valve to keep it from turning.
6. Install an additional external manual shutoff valve in the
vertical pipe about 5 feet above floor outside the boiler
jacket.
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 the propane
installer.
10. Propane gas piping should be checked out by the propane
installer.
11. It is recommended to use a 1/2" union suitable for natural
and propane gas after the ball cock to facilitate service on
the unit.
CHECKING THE GAS PIPING
After all connections have been made, check immediately for
leaks. Open the manual shutoff valve. Test for leaks by applying
soap suds (or a liquid detergent) to each joint. Bubbles forming
indicate leak. CORRECT EVEN THE SMALLEST LEAK AT
ONCE.
STEP 7 —Electrical Wiring
Propane Gas
14" w.c.
10" w.c.
All electrical work must conform to local codes as well as the
National Electrical Code, ANSI/NFPA- -70, latest revision. In
Canada, electrical wiring shall comply with the Canadian
Electrical Codes, CSA- -C22.1 and .2.
ELECTRICAL POWER SUPPLY
Prior to making any line voltage connections, service switch at
boiler should be in the off position and the power turned off at the
fuse box.
Run a 120 volt circuit from a separate over current protection
device in the electrical service entrance panel. (NOTE: Use
copper conductors only.) This should be a 15 ampere circuit. A
service switch has been pre- -wired and located on the exterior
boiler jacket. See Fig. 15 for diagram showing location of service
switch junction box and power supply connection points.
Connect black (hot) lead from the power supply to either of the
unused brass screws on the service switch. Connect the white
(neutral) lead from the power supply to the white screw on the
service switch. Connect the green (ground) lead from the power
supply to the ground (green) screw on the service switch. The
receptacle on the service switch is always powered regardless of
whether the switch is on or off, and could be used as a power
supply for an external condensate pump if one is used.
The boiler, when installed, must be electrically grounded in
accordance with the requirements of the authority having
jurisdiction or, in the absence of such requirements, with the
National Electrical Code, ANSI/NFPA- -70, latest revision. In
Canada, electrical wiring shall comply with the Canadian
Electrical Codes, CSA- -C22.1 and .2.
Run a 14 gauge or heavier copper wire from the boiler to a
grounded connection in the service panel or a properly driven and
electrically grounded ground rod.
10
WARNING
!
FIRE AND EXPLOSION HAZARD
Failure to follow this warning could result in personal
injury, death and/or property damage.
Never use a match or open flame to test for leaks.
WARNING
!
ELECTRICAL SHOCK HAZARD
Failure to follow this warning could result in personal
injury or death.
Turn off electrical power at fuse box before making any
line voltage connections. Follow electrical codes.