Hubbell G250P, Руководство по установке и эксплуатации, Страница: 22 / 67

22
Fresh Air and Exhaust Piping Installation
SAFETY
INSTRUCTIONS
For information on combustion air, either from inside the building or
from the outside, refer to the Venting section in this manual.
1. Select an approved material for the combustion air
inlet. Refer to the table below for a list of approved
materials. Also select the appropriate diameter of pipe
based on length and number of units being installed,
as shown in the tables in the Technical Specifi cations
section.
United States Vent Pipe Standards
Material Description
Vent Pipe
PVC Schedule 40
CPVC Schedule
4
0
Approved Polypropylene
Canadian Vent Pipe Standards
Material Description
Vent Pipe
Type BH Special Gas Vent Class IIA (PVC)
Type BH Special Gas Vent Class IIB (CPVC)
Type BH Special Gas Vent Class IIC (Polypropylene)
NOTE
: Consult the following chart or the most
recent edition of ANSI Z223.1/NFPA 54 or CAN/
CGA B149.1, as well as all applicable local codes
and regulations when selecting vent pipe
materials.
For installation in Canada, installer-supplied plastic
vent piping must comply with CAN/CGA B149.1 and
be certified to the Standard For Type BH Gas Venting
Systems, ULC-S636. Components of this listed system
must not be interchanged with other vent systems or
unlisted pipes or fittings. All plastic components and
specified primers and glues must be from a single system
manufacturer and must not be intermixed with another
system manufacturer’s products
SAFETY
INSTRUCTIONS
Do not use cellular foam core pipe to vent exhaust gases.
IMPORTANT
On multiple unit installations, the piping from the
water heater can be 4” or larger piping. Use the
tables on page 11 to determine the diameter of the
common connecting piping between each individual water
heater.
2. Install the desired confi guration of pipe for the
combustion air inlet. If the installation allows 2” pipe to
be used for this air inlet, install at least a 6” long piece
of 3” pipe with a 3” to 2” adapter.
IH-70
6"
3" Pipe
CAUTION
TOXIC FUMES HAZARD
If the inside of the pipe is not chamfered to remove all sharp
edges, the O-ring seals can be damaged during installation.
Damaged O-rings could allow combustion gases to leak
into the house.
a
. Cut a 45 degree chamfer on the inside edge of the
3” pipe. Remove any shavings.
IH-70a
45°
COMBUSTION (FRESH) AIR INLET EXHAUST OUTLET CONNECTIONS
b
.
Apply a small amount of water or liquid soap on
the chamfered surfaces to serve as a lubricant
.