LAARS Rheos RHCV - Install and Operating Manual - Manual (Page 6)

LAARS Heating Systems Page 6
1.5 Outdoor Installations
Attach the appropriate termination and appliance
adaptor to the vent outlet (see Table 1). Units are
shipped with a louvered cover over the ducted air
connection. Do not remove this cover, and/or add any
piping to the ducted air connection. The unit will take
its combustion air through the louvers in the jacket.
WARNING
The outdoor terminal gets hot. Unit must be
installed in such a way as to reduce the risk of
burns from contact with the vent terminal.
The dimensions and requirements that are shown
in Table 2 should be met when choosing the locations
for the appliance:
Required Suggested
Clearance From Service
Appliance Combustible Material Clearance
Surface inches cm inches cm
Piping Side 1 2.5 24 61
Opposite Side 1 2.5 24 61
Top 1 2.5 24 61
Back 1 2.5 36 91
Front 1 2.5 36 91
Vent per UL1738 venting system
supplier's instructions
Table 2. Clearances.
1.7 Locating Pump-Mounted Water Heater
with Respect to Storage Tank(s)
For best results a pump-mounted Rheos water
heater should be located within 15 feet (4.6m) of the
storage tank(s). The pump is sized for 30 feet (9.1m)
of piping.
Water heater pumps are sized for water hardness;
7.6 to 17 grains per gallon for normal water, and
greater than 17 grains per gallon for hard water. If
the system has soft water (1 to 7.5 grains per gallon
hardness), but the Rheos has a normal water pump
mounted in it, please consult the factory for assistance.
If the appliance must be installed with longer
piping runs, then larger diameter pipe or tubing may be
able to be used, in some instances. Consult the factory
for assistance.
1.8 Locating Pump-Mounted Boiler with
Respect to Return/Supply Header
For the best results a pump-mounted Rheos
Boiler should be located within 15 feet (4.6m) of
the supply and return headers. The pump is sized for
30 feet (9.1m) of piping, in most cases, enough for
primary-secondary piping systems.
If the appliance must be installed with longer
piping runs, then larger diameter tubing may be able
to be used, in some instances. Consult the factory for
assistance.
1.9 Locating Appliance for Correct Vent
Distance From Outside Wall or
Roof Termination
The forced draft combustion air blower in the
appliance has sufficient power to vent properly when
the guidelines in Table 3 are followed.
NOTE: When located on the same wall, the Rheos
combustion air intake terminal must be installed
a minimum of 12" (30cm) below the exhaust vent
terminal and separated by a minimum of 36 inches
(91cm) horizontally.
Model (Size)
Termination Appliance Adapter
1200 D2008300 D2008500
1600 D2008300 D2008500
2000 D2008400 D2008600
2400 D2007500 D2007600
Table 1. Terminals for Outdoor Installation.
In installations where the air temperature may
go below 15°F (-9°C), a valve heater kit, part number
R2010100, must be installed on the operating gas
valve. Instructions for the installation of the valve
heater are included with the kit.
NOTE: Units built with control packs B and E
have two actuators. Therefore, two heater kits must be
used.
1.6 Locating the Appliance
The appliance should be located to provide
clearances on all sides for maintenance and inspection.
It should not be located in an area where leakage of
any connections will result in damage to the area
adjacent to the appliance or to lower floors of the
structure.
When such a location is not available, it is
recommended that a suitable drain pan, adequately
drained, be installed under the appliance.
The appliance is design certified by CSA-
International for installation on combustible flooring;
in basements; in closets, utility rooms or alcoves.
Rheos Boilers or Water Heaters must never be
installed on carpeting. The location for the appliance
should be chosen with regard to the vent pipe lengths
and external plumbing. The unit shall be installed such
that the gas ignition system components are protected
from water (dripping, spraying, rain, etc.) during
operation and service (circulator replacement, control
replacement, etc.). When vented vertically, the Rheos
must be located as close as practical to a chimney
or gas vent. If the vent terminal and/or combustion
air terminal terminate through a wall, and there is
potential for snow accumulation in the local area, both
terminals should be installed at an appropriate level
above grade.