Specifications

12 EMPYRE PRO SERIES INSTALLATION AND OPERATION MANUAL
INSTALLATION
4. Foran‘unconned’spaceinaconventionallyconstructed
building,thefreshairinltrationthroughcracksaround
windows and doors NORMALLY provides adequate air for
combustion and ventilation, and therefore no additional
make up air is required.
5. For a ‘conned’ space or an ‘unconned’ space
in a building with unusually tight construction, an
additional source of make up air is required. Please
consult an HVAC professional to determine the best
way to supply make up air for this type of installation.
Low Water Temperature Protection
IT IS THE RESPONSIBILITY OF THE INSTALLER TO PRO-
VIDE LOW WATER TEMPERATURE PROTECTION IN
THE DESIGN OF THE HEAT DISTRIBUTION SYSTEM.
The Empyre Pro Series furnace is no different than an
oil boiler or gas boiler in that condensation of the prod-
uctsofcombustionwilloccurifuegasescomeincon-
tact with a surface that is less than 140°F (60°C). With
an oil or gas boiler the rate of fuel and consistency of
the fuel is automatic, so if the temperature of the water
in the boiler falls below the desired setting the burner
comes on automatically raising the water temperature.
The Empyre Pro Series requires an automatic protection
from low water temperature because of the manual fuel
feed.
Condensation (water) in the boiler tubes will cause corro-
sion and premature failure. There are many ways of pre-
venting the temperature from falling too low.
Empyre System Optimizer
The Empyre System Optimizer (ESO) is designed with a low
loss header which includes a Danfoss VTC valve, complete
with a pump ange and bypass piping. The Danfoss
VTC tempering valve was selected for its simplicity and
reliability.
The Empyre System Optimizer is mandatory on all Empyre
Pro Series installations in order to maintain the warranty.
How the ESO and Valve Operates
The Empyre System Optimizer provides a constant
circulation of water through the boiler and the Danfoss VTC
tempering valve. Water is drawn off the low loss header by
the building piping system and returned to that same loop
where it mixes with the water in the low loss header. Before
it reenters the boiler, it passes through the tempering valve.
If the water entering the valve is too cold, the valve starts
to slow the water returning and mixes it with water coming
directly from the boiler. If the return water temperature
drops below 140°F (60°C) the valve will stop this cold
water from entering the boiler. The valve will open again
when the boiler water rises in temperature.
Water Line Hookup
NOTE: It is the responsibility of the installer to provide
low water temperature protection.
1. Hook up supply to “Supply” port and return to
“Return” port as indicated (see page 8). Note: When
using only one set of hookups, always use the left
set (closest to the snap disc).
2. Install shut off valves on all lines attached to the
furnace to prevent loss of water during maintenance
and repairs. Fittings and valves to be attached to the
furnace should either be stainless steel or brass.
See Figures 1 to 3, page 13.
Important: Pump must always be in lowest part of the
water line system from the Empyre Pro Series to the
building. Pump may be at the furnace or in the building.
Note: The spacing between the tees must be no more
than 4 times the diameter of the plumbing line size.
The Empyre System Optimizer may be installed in the
vertical position.
Electrical Hookup
Have a junction box with a receptacle installed in the
backofthefurnacebyaqualiedelectriciantoensure
all national and municipal codes are met. This is to be
installed inside the back of the furnace on the bottom
pan surface or up on either side.
Note: The junction box and receptacle installation is to
be a dedicated receptacle to run the furnace and the
circulating pumps.