Installation Manual

21
ue gases to the outdoor atmosphere through a sealed vent (exhaust)
pipe. Direct Vent congurations have two pipes connected to the water
heater, one vent pipe and one intake air pipe. Direct Vent congurations
can be terminated in one of seven different arrangements. See Figure
38 on page 33 through Figure 44 on page 34.
GENERAL VENTING INSTRUCTIONS
These instructions must be followed on all installations.
1. DO NOT install the water heater in a Power Vent conguration
unless there is adequate supply of fresh air, see Air Requirements
on page 17. If the installation space does not provide an adequate
supply of fresh air the water heater must be installed in a Direct
Vent conguration.
2. If the water heater is to be installed in a beauty shop, barber shop,
cleaning establishment, a laundry with dry cleaning equipment
or any space with contaminated air it is imperative that the water
heater(s) be installed in a Direct Vent conguration so that all air for
combustion is derived from the outdoor atmosphere.
3. The vent and intake air piping must terminate outdoors.
4. The minimum clearance from combustible materials for the vent
(exhaust) and intake air piping shall be 0 inches. Vent piping
passing through a combustible wall or ceiling must be a continuous
run (no joints).
5. The water heater must be protected from freezing downdrafts
during shutdown periods.
6. The vent (exhaust) pipe must not be combined or connected to
any other appliance’s vent system or chimney.
7. The intake air pipe must not be combined or connected to any
other appliance’s intake air piping.
8. Locate the water heater where the vent (exhaust) and intake air
piping will remain within the maximum equivalent lengths allowed.
See Venting Requirements on page 22.
9. Do not install the vent or intake air piping in a manner that will allow
water to be trapped in the piping.
10. Vent pipes must be pitched a minimum of a 1/4 inch per foot back
to the water heater (to allow drainage of condensate).
11. Do not anchor the vent or intake air pipe directly to framed walls,
oors or ceilings unless rubber isolation pipe hangers are used to
prevent vibration noise from being transmitted.
12. Use only approved vent/intake air pipe sizes and materials. See
Venting Requirements on page 22.
13. Use only factory supplied vent and intake air, concentric or low prole
terminations. See the Venting Requirements on page 22.
14. Do not locate the vent (exhaust) or intake air terminations where
they would be objectionable due to noise at the termination(s). This
includes locations close to or across from windows and doors.
15. Direct venting into dead air spaces such as alleys, atriums, and
inside corners can cause recirculation of ue gases. Recirculation
of ue gases will cause sooting, premature failure of the heat
exchanger and icing of the combustion air intake during severe cold
weather. To prevent the recirculation of ue gases, maintain as much
distance as possible between the intake air and vent terminations.
16. Do not locate the vent termination over a public area where
condensate or vapor can cause a nuisance or ice hazard.
17. Ensure the screens in the factory supplied terminations are
securely installed to prevent blockage in the vent system.
18. Stress levels in pipe/ttings can be signicantly increased by
improper installation. If rigid pipe clamps are used to hold the
pipe in place, or if the pipe cannot move freely through a wall
penetration, the pipe may be stressed, or high thermal stresses
may be formed when the pipe heats up and expands. Install
accordingly to minimize such stresses.
19. Carefully read the Venting Requirements on page 22 and then
proceed to the Venting Installation Sequence on page 23.
VENTING INSTALLATION
Breathing carbon monoxide can cause brain damage or death.
Always read and understand the instruction manual.
Install vent system in accordance with codes.
Do not operate water heater if flood damaged.
Special consideration must be taken with installations
above 10,000 feet (3,048 m) refer to high altitude
section of this manual.
Breathing Hazard - Carbon Monoxide Gas
•
•
Do not operate if soot buildup.
•
Do not obstruct water heater air intake with insulating
jacket or blanket.
•
Do not place chemical vapor emitting products near
water heater.
•
Gas and carbon monoxide detectors are available.
•
Never operate the heater unless it is vented to the
outdoors and has adequate air supply to avoid risks
of improper operation, fire, explosion or asphyxiation.
•
Analyze the entire vent system to make sure that
condensate will not become trapped in a section of
vent pipe and therefore reduce the open cross
sectional area of the vent.
•
•
Never operate the water heater unless it is vented to the outdoors.
The instructions in this section of the manual must be followed
to avoid choked combustion or recirculation of ue gases. Such
conditions cause sooting of the combustion chamber, burners
and ue tubes and creates a risk of asphyxiation.
GENERAL VENTING INFORMATION
The water heaters covered in this manual are operationally
equivalent to Category IV appliances and may be installed in
either a Power Vent or Direct Vent conguration.
APPROVED MATERIALS
Approved vent and intake air pipe materials that may be used in
the United States:
• PVC Schedule 40 (ASTM D 2241 / CSA B181.2, ASTM D
1785 / CSA B137.3
• CPVC Schedule 40 (ASTM F-411 / CSA B137.6)
• Polypropylene - See Page 27.
• AL29-4C Stainless Steel - See Page 27.
Approved vent and intake air pipe materials that must be used
in Canada:
• ULC S636 PVC / CPVC
• ULC S636 Polypropylene - See Page 27.
• AL29-4C Stainless Steel - See Page 27.
CATEGORY IV APPLIANCE
Category IV appliances operate with a positive vent (exhaust)
static pressure and with vent gas temperatures low enough to
produce condensate in the vent piping.
POWER VENT CONFIGURATION
Power Vent congurations derive all combustion air from the
room where they are installed and discharge all ue gases to
the outdoor atmosphere through a sealed vent (exhaust) pipe.
Power vent congurations have one vent pipe connected to the
water heater which can be terminated in a vertical or horizontal
arrangement. See Figure 36 and Figure 37 on page 33.
DIRECT VENT CONFIGURATION
Direct Vent congurations derive all combustion air directly from the
outdoor atmosphere through a sealed intake air pipe and discharge all