Installation Manual

Demand Duo™ H-Series Installation and Operation Manual 18
1. Install the water heater.
2. Determine the termination method —
horizontal or vertical, concentric, or twin
pipes, etc.
3. Determine proper location for wall or roof
penetration for each termination.
4. Install termination assembly as described in
this manual or in the vent manufacturer’s
installation instructions.
5. Install air and vent piping from water heater
to termination.
6. Slope horizontal exhaust run towards the
water heater 1/4 in per foot. DO NOT slope
combustion air pipe
towards water heater.
7. Install vent supports and brackets allowing
for movement from expansion, or as per
vent manufacturer’s
instructions or local code requirements.
8. Install vent screen (supplied with water heat-
er) on PVC combustion air and exhaust ter-
mination elbows as
illustrated below.
• Press vent screen inside of termination
piece/elbow.
• Secure vent screen to the elbow with
screw provided.
Check to determine whether local codes
supersede the following clearances:
• Avoid termination locations near a dryer
vent.
• Avoid termination locations near
commercial cooking exhaust.
• Avoid termination locations near any air
inlets.
• You must install a vent termination at least
12 in above the ground or anticipated
snow level.
The vent for this appliance shall not terminate:
• Over public walkways.
• Near soffit vents or crawl space vents or
other area where condensate or vapor
could create a nuisance or hazard or
cause property damage.
• Where condensate or vapor could cause
damage or could be detrimental to the
operation of regulators pressure relief
valves, or other equipment.
Listed below are important considerations for
locating vent termination under a soffit
(ventilated or unventilated or eave vent; or to a
deck or porch):
• Do not install vent termination under a
soffit vent such that exhaust can enter the
soffit vent.
• Install vent termination such that exhaust
and rising moisture will not collect under
eaves. Discoloration to the exterior of the
building could occur if installed too close.
• Do not install the vent termination too
close under the soffit where it could
present recirculation of exhaust gases
back into the combustion air part of the
termination.
Figure 7: Vent Screen Assembly