LAARS Horizon - Installation, Operation and Maintenance Instructions - Manual (Page 3)

Horizon Page 3
SECTION 1.
General Information
1A. Freight Claims
Inspection should be made of boiler and
components for damage upon arrival. Any claims for
damage should immediately be filed against the
carrier by the consignee.
1B. General Information
These boilers have been designed and
constructed according to the requirements of the
relevant ASME Codes using heavy gage steel plate
and boiler tubes. They are of the three pass horizontal
tube design using a reverse flame technique in the
boiler to impart a high heat transfer in the primary
heating zone before directing gases into the third pass.
The compact tubular third pass incorporates
special stainless steel flue gas baffles with extension
rods to allow full insertion of the baffles into the back
end of tubes where they are most effective.
A 5 gal/min. domestic hot water coil is located at
the top of the boiler in the hottest zone for ample hot
water supply. A unique feature of its attachment is the
raised coil flange which allows the use of clamping
bolts rather than studs, thereby eliminating water leaks
caused by broken studs.
Two ceraform lined doors provide easy access
for cleaning, the lower door with burner attached
remaining in position while the upper door is removed
for tube cleaning.
A flame observation port is provided for setting-
up burner and a test hole gives access for CO
2
and
draft readings.
The boiler is encased in a fully insulated baked
enamel jacket and comes completely pre-assembled
for easy installation. Alternatively, it can be supplied
in knock-down form.
Caution
This boiler is designed for use in closed systems
where air is eliminated from the system and no more
oxygen is allowed to enter (typical baseboard or
radiator system). Do not directly connect this boiler
to a system utilizing rubber or plastic tubing which
has an oxygen permeation rating greater than 0.1
milligrams / liter / day. Damage to the boiler will
result and the warranty will be void (see warranty
section 4g).
1C. Boiler Installation
For recommended installation practice reference
should be made to the National Fire Protection
Standard for Oil Burning Equipment - NFPA 31 -
Latest Edition.
1D. Boiler Location
The boiler should be positioned as near to the
chimney as possible and have a minimum smoke-pipe
connector length of 18".
1E. Boiler Clearances (minimum)
Top - 6"; Front - 24"; Rear - 6"; Sides - 6".
1F. Floor
The boiler must be mounted on a non-
combustible masonry or cement floor with no
combustibles underneath.
1G. Combustion and Ventilation Air
To insure an adequate supply of fresh air for
combustion and ventilation an inlet and outlet opening
should be provided at floor and ceiling level. Each
opening must have a minimum of one square inch of
free area for every 1000 BTU/h of input or 140 square
inches per gallon of oil burned per hour. The openings
must not be in a position liable to blockage.
1H. Chimney and Draft Requirements
To assure the safe and proper operation of the oil
burner the boiler must be connected to a chimney
having sufficient draft at all times to evacuate the flue
gases to atmosphere. A draft regulator should be
installed in the smoke-pipe as near to the flue as
possible and adjusted to achieve an over fire draft of
0.01 in. W.C.
1I. Jacket (normally fitted)
If not fitted, assemble panels in accordance with
instructions in Figure 2.
1J. Oil Burner (normally fitted)
If not fitted, insert burner tube into boiler so that
it is recessed approximately 1/4" back from the inside
wall of door insulation, then clamp mounting flange
and bolt up to front-plate.
The burner should be wired and connected to the
oil line in accordance with the manufacturer’s
instructions.
1K. Boiler Controls (normally fitted)
If controls are supplied separately, fit them to the
boiler in the positions shown in Figure 2, with jacket
in place.
Circulator - 1 1/4' return tapping at rear of boiler.
Tridicator - temp./press. gauge - 1/2" tapping at
top of boiler.
Relief Valve - 3/4" tapping at top of boiler. Pipe
to safe place of discharge.
Aquastat Relief - L8124A - 3/4" tapping.
Fit a drain valve (not supplied) in the hydronic
return tee. Check that all connections are made water
tight.
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