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Bosch 38B Water Heaters Tech Info
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Installation Tips Model 38B
Follow information provided on this page.
Installation
and service must be performed by a qualified installer, service agency
or the gas supplier.
Other tips: When venting it is best to
rise 12" off the top of the heater before making any 45 or 90 degree
elbows , then rise ¼" per foot when running any horizontal vent
pipe. Size gas line properly. Install the provided gas regulator with
its directional arrow facing the gas flow path (also be sure to
properly regulate Liquid Propane or Natural Gas at source when
supplying AquaStar). The small regulator that is provided is NOT to
be used on a high pressure line.
·Required Clearances
| MODEL 38B |
AMOUNT |
| TOP |
12" |
| FRONT |
4" |
| BACK |
0" |
| SIDES |
4" |
| FLOOR |
12" |
·Gas & Venting Model 38B
| Gas |
3/8" |
1/2" |
| Liquid Propane |
10 feet |
60 feet |
| Natural Gas |
20 feet |
80 feet |
| Venting |
Min. Diameter |
Min. Height |
| 4 inches |
6 feet |
·Dimensions Model 38B
| Height |
Width |
Depth |
Weight |
| 25-3/8" |
10-5/8" |
9-1/8" |
18 lbs. |
·Combustion Air Required Model 38B
In order to ensure an adequate supply of combustion
air, the National Fuel Gas Code requires that any conventional vented
gas appliance be installed in a room with a minimum volume of 50 cubic
feet per 1,000 Btu/hr rated input. The following is the minimum size
of the open space in which the AquaStar may be installed in compliance
with this requirement:
| Model |
Volume |
Area with an 8' ceiling |
| 38B |
1,900 cubic feet |
238 square feet |
If the AquaStar is installed in an area smaller than indicated above,
then the installer must make special provisions
for combustion air in the form of two openings, each one within
12" of the top and 12" of the bottom of the space, having a
total free area of 1 square inch per 1,000 Btu/hr of rated input if
the air is taken from inside the house. This requirement reduces to 1
square inch per 4,000 Btu/hr if the air is taken from the outside.
Note: This calculation assumes normal rates
of "infiltration" of outside air. A super-insulated,
super-tight space/building may require outside air for the AquaStar
even though the volume/area of the space meets this application.
Caution: In addition to the above, the
AquaStar must be properly vented to ensure safe and efficient
operation.
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