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CAUTION
Allow for expansion and contraction of the supply
and return lines at each end. Without an allowance
for expansion and contraction, the lines may kink
or the fittings may be pulled apart, causing an
immediate water loss from the outdoor furnace.
Central PEX water lines can have an expansion
and contraction rate up to .095" per each 100 ft
and each 10°F (2.4 mm/30 m/5.5˚C).
7. Make sure there are no leaks in the supply and return
lines; then backfill the trench.
NOTE: Do not backfill the trench until the supply
and return lines have been tested to ensure there
are no leaks.
INSTALLING LP TANK & GAS PIPING
If installing an LP tank for the optional gas-fired wood
ignition burner, it must be installed by a qualified
installer familiar with all regulations and must conform
to the authorities having jurisdiction, or in the absence
of such requirements, with the NFPA 54, the National
Fuel Gas Code ANSI Z223.1 or CAN/CGA B149.
All gas piping must conform to the authorities having
jurisdiction, or in the absence of such requirements,
with the National Fuel Gas Code ANSI Z223.1 or CAN/
CGA B149. The line to the outdoor furnace should be
buried underground and supported to the gas valve
appropriately. The piping should be installed and
tested for leaks by a qualified installer familiar with
all regulations. A sediment trap should be provided
upstream of the gas controls.
A two-regulator system using a first-stage and a second-
stage regulator, or a combination two-stage regulator
(p/n 1930) such as the one shown in Fig. 7 should be
used. A small single-stage regulator may not flow
enough in cold weather.
Fig. 7
CAUTION
Make sure all covers for the gas ignition system
on the appliance are in place during operation
and service.
Section 1 - Outdoor Furnace Installation
WARNING
Once the gas supply is connected, the appliance
and gas connection must be tested for leaks
before placing the appliance in operation.
HIGH ALTITUDE INSTALLATIONS
High altitude derating instructions are included with the
Gas-fired Wood Ignition Burner Kit.
CIRCULATION PUMPS
NOTE: The direction of water flow is very
important for the proper operation of the outdoor
furnace. Installing a swing check valve in the
return line can prevent possible reverse flow.
Water Flow
For a single building water-to-air heat exchanger system
with a domestic water heater, the direction of water
flow must go from the hot outlet on the outdoor furnace
to the lower side fitting of the domestic water heater
exchanger, to the lower fitting of the heat exchanger
in the plenum of the existing furnace, and then to the
return port of the outdoor furnace.
NOTE: Some systems may have different flow
patterns.
Access to Ports on Outdoor Furnace
NOTE: Spare ports are sealed with pipe plugs
and covered with vinyl caps. To access a spare
port, remove the vinyl cap and trim the foam as
necessary.
The upper ports are the hot supply outlets and the lower
ports are the return inlets. This configuration allows for
mounting the circulation pumps on the outdoor furnace.
Refer to Fig. 8 and 9 for proper supply and return line
and pump installations.
Pump Selection
The Taco 009 is a medium flow, high head pressure
pump that requires an adequate amount of pressure on
the outlet side to prevent the motor from overloading.
The Taco 014 is a high flow, high head pressure pump
that requires an adequate amount of head pressure on
the inlet side to prevent cavitation. Therefore, a Taco
014 may need to be mounted lower near the base of the
furnace.
The Taco 007 is a medium to high flow, low head
pressure pump. In a very low-resistance system (e.g.,
short length of supply and return lines, only a flat plate
heat exchanger, etc.), the 007 pump may need to be
mounted lower near the base of the furnace to prevent
cavitation at high water temperatures.
NOTE: See the Hydronic Component Selection
Guide (p/n 2482) for more detailed information.
11
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