Pex Pipe Routing
The furnace shown is an older single zone
plus the hot water coil.
All furnaces come
with another hookup now for another
building, at no cost (not shown).
2
nd
Pump
not included.
Do not wire as shown
. This is not to code
and is shown this way for simplicity only.
Single zone setup
with one pump
1. Goes to house heat exchanger
2. Return from house heat exchanger
3. Power to pump, thermostat and
blower
4. Inlet to potable water coil (not seen -
inside of furnace, in water jacket)
5. Outlet from potable water coil
6. To manual fill valve on front of
furnace
7. Water supply to furnace from manual
fill valve
8. Optional outdoor hot water supply for
a faucet or steam cleaner hookup.
9. Drain
10. Blower/fan to feed oxygen to fire
11. Armstrong Astro-30 Pump, one
included (to circulate water)
12. Thermostat (for blower)
#1 and 2 with arrow shows direction of
water flow for built-in hot water coil in
furnace
Recent research has shown that it’s
better to have the pump at the bottom
and the return line where the pump is
shown now!
14
Location of Furnace
SOME STATES HAVE THEIR OWN LAWS!
The outdoor furnace should be located at least 10 feet from your home (according to most
insurance companies), with the door facing away from the house, so that all fire danger is
removed from your home. We recommend 30 feet or more. The furnace may be installed as
much as 100-120 feet away with the standard pump (or up to 300’ with a bigger pump) and