Lochinvar GAS HEATER FOR COMMERICAL POOL Installation And Service Manual page 23

Installation and Service Manual
In cold climates, use a Type-B doublewall vent pipe or an
insulated single wall pipe for combustion air. This will help
prevent moisture in the cool incoming air from condensing and
leaking from the inlet pipe.
CAUTION: Pool heaters that are shut down
or will not operate may experience freezing due
to convective airflow in the air inlet pipe.
Length of Air Inlet Pipe
The installed length of air inlet pipe from the pool heater to the
outside air inlet cap must not exceed 50 equivalent feet
(15.2m). Subtract 5 feet (1.5m) of equivalent length for each
90° elbow. Subtract 2.5 feet (0.7m) of equivalent length for
each 45° elbow.
Do not exceed the limits for the combustion air inlet piping
lengths.
Connecting the Air Inlet Pipe to the Pool Heater
Connect the air inlet piping directly to the pool heater by
attaching it to the DV box adapter. The DV box adapter is
included in the direct vent kits for horizontal direct vent. For
vertical direct vent, order the DVK3003 kit from the pool
heater manufacturer. The combustion air inlet area of the pool
heater is located at the right rear corner of the pool heater. This
pool heater uses a simple air filter to ensure clean air is used
for the combustion process. Attach the DV box adapter over
the air filter (see Figure 24). Align the screw holes on the DV
box adapter with the screw holes surrounding the air filter
hanger. Insert the sheet metal screws and tighten firmly.
Figure 24 – Attaching DV Box Adapter to Unit
For venting versatility, you can move the air filter assembly and
DV box adapter to the right side of the pool heater. Remove the
metal panel on the pool heater's right side (see Figure 25).
Remove the filter/bracket assembly from the rear of the pool
heater.
Note: Modifications to the DV box adapter will be necessary
to allow installation on the right side of the pool heater. Follow
the instructions shipped with the vent kit.
Attach the filter/bracket assembly and DV box adapter to the
right side opening using the pre-drilled screw holes. Make sure
you attach the metal panel to the rear combustion air opening of
the pool heater.
The DV box adapter has an air inlet pipe mounting ring.
Connect combustion air inlet piping to the direct vent box
mounting ring.
Figure 25 – Moving Air Filter Assembly and DV Box
Adapter
Air Inlet Piping Materials
The air inlet pipe(s) must be sealed. Select the air inlet pipe
material from the following specified materials.
• PVC, CPVC, or ABS (6", 7", or 8" I.D.)
• Galvanized steel vent pipe with joints and seams sealed as
specified below.
• Type-B doublewall vent with joints and seams sealed as
specified below.
Check local codes for possible restrictions.
WARNING: Use only vent or air intake
materials specified in this manual. Follow vent
pipe manufacturer's instructions. Failure to do so
can result in property damage, personal injury, or
death. Mixing of venting materials will void the
warranty and certification of this pool heater.
Sealing Type-B Doublewall Vent Pipe or Galvanized
Vent Pipe
Follow the steps below to properly seal Type-B doublewall
vent pipe or galvanized vent pipe.
1. Seal all joints and seams of the air inlet pipe using either
aluminum foil duct tape meeting UL Standard 723 or 181
A-P or a high quality UL Listed silicon sealant such as
those manufactured by Dow Corning or General Electric.
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