Slant/Fin EC-20 Installation - Manual (Page 6)

EUTECTIC EC-20 6
The opening size recommendation just given is for guidance
only. It is the installer’s responsibility to provide air for combus-
tion and ventilation to all appliances, under all operating con-
ditions, for each installation. See NFPA 31, latest edition for
more specific details.
INSTALLING CONTROLS AND ACCESSORIES
ON BOILER UNITS
Notes
:Jacket must be installed on boiler units prior to
installation of trim.
WATER BOILER TRIM, see page 2, figures 1 for tapping
locations.
WATER PIPING FOR HOT WATER HEATING BOILERS
NOTE: On knocked-down boiler only, jacket may be installed
after return piping connection, but must be installed prior to
adding trim, supply piping and drain valve.
I. CIRCULATING SYSTEM
A. FORCED CIRCULATION hot water heating system: Use
the top tapping as supply tapping, and use the rear bot-
tom tapping for the return.
B. A FLOW CONTROL VALVE will prevent gravity circula-
tion and is required when an external tankless heater,
an indirect water heater or multiple circulators are
installed.
II. AIR CONTROL SYSTEMS
A. DIAPHRAGM-TYPE COMPRESSION TANKS are used
to control system pressure in an AIR ELIMINATING
SYSTEM: an automatic air vent is used to REMOVE air
from the system water. (See figure 4)
If system pressure needs further control, add an addi-
tional tank or install a larger capacity tank.
The automatic air vent should be installed in the top of
the boiler, as in figure 4 and at radiation high points.
B. CONVENTIONAL COMPRESSION TANKS (non-
diaphragm type) are used to control system pressure in
an AIR COLLECTING SYSTEM. Within the system,
after initial start-up and venting, air is collected in the
tank and acts in contact with the water to control pres-
sure. Air is not vented from this system except at radia-
tion high points.
If system pressure needs further control, add another
tank in parallel with the original tank or install a large
capacity tank. Locate the tank at the inlet end of the
pump near the boiler.
C. HOT WATER RADIATION VENTING - Manual air vents
should be installed at the top of all "drops" (where pip-
ing goes downward). Air must be vented or purged from
all zone lines to permit proper system heating.
D. PUMP LOCATION - Locating low-head pump(s) on
return to boiler is only acceptable in residences of one
or two stories. The pump location shown in figure 4 is
required in large, multi-story building installations, espe-
cially when high-head pumps are used and is also rec-
ommended for all applications.
IMPORTANT: Hot water heating systems containing high water
volume, such as would occur with cast iron radiation, require
special care with air elimination.
The circulator pump should be located on the boiler supply pipe
and the expansion tank and air scoop should be located near
the pump suction. For alternate circulator pump location on
return for low-head pumps and one or two story buildings ONLY.
Air Eliminator
as per Manufacturer
Specifications
To Circ. (s)
and Zones
1-1/2”
NPT
Supply
Automatic
Air Vent
Suppy Pipe Mounted
Tridicator
1-1/2”
NPT
Return
3/4”
NPT
Drain
Figure 4. Air Eliminating System or Air Collecting System