Direct Venting - Lochinvar GAS HEATER FOR COMMERICAL POOL Installation And Service Manual

Installation and Service Manual
For proper operation, a barometric damper is provided for
Horizontal DirectAire TM installations. The damper will help to
ensure a draft between negative 0.04 to 0.08 inches w.c.
TABLE-F
Horizontal DirectAire™ Kits
Input
Btu/hr
500,000 HDK3031
650,000 HDK3032
750,000 HDK3032
990,000 HDK3037
1,260,000 HDK3038
1,440,000 HDK3038
1,800,000 HDK3039
2,070,000 HDK3039
*These kits include a sidewall venter assembly, vent termination, DV box
adapter, sidewall air inlet cap, and a barometric damper. See note on page 12
concerning DV box adapter.

5. Direct Venting

IMPORTANT: Before installing a venting system,
follow all venting clearances and requirements
found in the Venting, General Information
section, page 10.
This option uses sealed AL29-4C vent materials for the flue
outlet piping and separate combustion air inlet piping. This
system terminates both the flue and combustion air inlet in the
same pressure zone. The flue outlet and combustion air intake
may terminate at either a sidewall or the rooftop.
To use the optional Direct Vent system, you must install
specific vent kits and venting materials. The following is a
detailed explanation of Direct Vent installation requirements,
including the components used and vent kit part numbers.
Flue Outlet Piping
Venting Guidelines
If using this venting option, a sealed AL29-4C venting system
for flue products is required on all models of this pool heater.
This venting system operates with a positive pressure in the
vent. The internal combustion air blowers generate this
positive pressure which operates the combustion process and
also exhausts the flue products from the building.
This vent system has specific vent material and installation
requirements. Only use listed sealed AL29-4C vent system
Kit*
materials. Follow all installation requirements. See
TABLE–B, page 11 for proper pipe size for your pool heater.
A list of sealed AL29-4C flue pipe manufacturers is located on
page 22.
Seal all vent joints and seams gas-tight.
Drain Tee Installation
A drain tee must be installed in the vent pipe to collect and
dispose of any condensate that may occur in the vent system.
The drain tee must be installed as the first fitting after the
horizontal ell on the top of the unit (see Figure 22A). Plastic
drain tubing, sized per the vent manufacturer's instructions,
shall be provided as a drain line from the tee. The drain tubing
must have a trap provided by a 3" (7.6cm) diameter circular
trap loop in the drain tubing. Prime the trap loop by pouring a
small quantity of water into the drain hose before assembly to
the vent. Secure the trap loop in position with nylon wire ties.
Use caution not to collapse or restrict the condensate drain line
with the nylon wire ties. The condensate drain must be routed
to a suitable drain for disposal of condensate that may occur in
the direct vent system. Refer to the condensate drain
installation instructions as supplied by the manufacturer of the
vent material.
WARNING: Do not combine the flue from
this unit with the vent from any other appliance.
Do not combine flues from multiple appliances
into a common vent. The flue from this unit must
be a dedicated stack.
Connect the flue vent directly to the flue outlet opening on the
top of the pool heater. Make the connections from the pool
heater vent to the outside stack as direct as possible with no
reduction in diameter. Provide adequate clearance to
combustibles for the vent connector and firestop. Follow the
vent manufacturer's instructions when installing sealed AL29-
4C vents and accessories, such as firestop spacers, vent
connectors, thimbles, caps, etc.
Provide adequate clearance to combustibles for the vent
connector and firestop.
When planning the venting system, avoid possible contact with
plumbing or electrical wiring inside walls, ceilings, and floors.
Locate the pool heater as close as possible to the chimney or gas
vent. When a vent system is disconnected for any reason, the
flue must be reassembled and resealed according to the vent
manufacturer's instructions.
The installed length of flue from the pool heater to the outside
point of termination must not exceed 50 equivalent feet
(15.2m). Subtract 5 feet (1.5m) of equivalent length for each
21