LAARS HEATING SYSTEMS
Page 4
SECTION 2.
Installation
2.1 Heater Placement
The heater must be placed to provide specific
clearances on all sides for maintenance and
inspections. There must also be minimum distances
maintained from combustible surfaces. These
clearances also apply to noncombustible materials
because the heater requires air circulation for proper
operation.
The heater should be mounted on a level surface.
An integral base for an installation on combustible
flooring is provided as standard equipment on all
models.
Do not install a heater on carpeting.
Under the national Fuel Gas Code, ANSI
Z223.1, it is permissible to place the heater on floors
other than noncombustible when the installation
complies with the American Insurance Code. Figures
2, 3, and 4 show common installation on combustible
flooring.
2.2 Installation of Indoor Heaters
Locate the heater to provide adequate clearance
for inspection and service on all sides. See Table 1.
Install indoor heaters on a waterproof floor with
an adequate floor drain and a 6" (152mm) minimum
curb on all four sides to protect the building if heater
repairs are required. The manufacturer will not be
held liable for any water damage in connection
with this heater.
2.2.1 Combustion Air Supply
The heater location must provide sufficient air
supply for proper combustion and ventilation of the
surrounding area as outlined in the latest edition of
ANSI standard Z223.1, and any local codes that may
be applicable. Inadequate combustion air supply may
result in incomplete combustion, sooting of the heat
exchanger, and unsafe operation of the boiler.
2.2.1.a Conventional Ventilation
In the United States, these requirements specify
that small heater rooms should be provided with two
permanent air supply openings communicating
directly through the wall to outside air one within 12
inches (305mm) of the ceiling, and the other within
12 inches (305mm) of the floor. Each opening should
have a minimum free area of one square inch
(6.5 sq. cm) per 4,000 BTU/h input of the total input
rating of all appliances in the enclosed area. See Table
2 for recommended air supply for each model. An
improperly ventilated equipment room can get
excessively hot and cause accelerated deterioration
of controls and electrical components.
In Canada, Table 2 does not apply. Consult local
building codes or, in the absence of such requirements,
follow CGA requirements and/or CAN/CGA B-149
standard.
Clearance
Indoor
Outdoor
from
in.
mm
in.
mm
Top
30
762
unobstructed
Water Conn. side
12*
305
24
610
Pump side
6*
152
24
610
Front
Alcove*
unobstructed
Rear
8
203
24
610
Vent pipe**
6
152
- - -
Hot water pipes
per code
per code
* Water connection and pump side clearances of 24" (610mm)
and front clearances of 48" (1219mm) will allow easier
service access.
** One inch using type B vent (refer to Manufacturer's Instructions).
Table 1. Minimum Heater Clearances From
Adjacent Surfaces.
Figure 2. Typical Heater Installation on Concrete Slab.
Figure 3. Typical Heater Installation on Roof Using
Raised Platform (wood).
