Appliances located in confined spaces:) The confined space must be provided with two permanent openings, one commencing within 12 inches of the top and one commencing within 12 inches of the bottom of the enclosure. Each opening must have a minimum free area of one square inch per:
-1000 Btu/hr if all air is taken from inside the building.
-2000 Btu/hr if all air is taken from the outside by horizontal ducts.
-4000 Btu/hr if all air is taken from the outside by direct openings or vertical ducts.
Louvers, grills and screens have a blocking effect. If the effective free area is not known, increase the sizes of your openings by 75% if your louvers are wood and by 30% if your louvers are metal. Refer to the National Fuel Gas Code for complete information. In buildings of tight construction all air should be taken from outside. That would be 2000 cubic feet for the Aquastar 38B alone.
CLEARANCES
The Aquastar 38 B is design certified for installation on a combustible wall and for installation in an alcove or closet with the minimum clearances to combustible and non - combustible construction listed below
A.Top 12 inches ( 305 mm)
B.Front 4 inches (102mm)
C.Back 0 inches
D.Sides 4 inch (102mm)
E.Bottom 12 inches (306 mm)
Clearance from vent is dependent upon the clearance rating of the venting material used. For example: type
Note: Minimum clearance to combustible materials should not be less than 6" for single wall flue pipe. Note that this clearance can be reduced if combustible material are protected as per table VI of the National fuel Gas Code or if Type B gas vent is used.
MOUNTING INSTALLATION
The Aquastar 38 B is design certified for mounting on a wall.
Do not install this appliance on a carpeted wall or over floor covering which is combustible, such as carpet. The heater must be mounted on a wall using appropriate anchoring materials. If wall is a stud wall sheathed with plasterboard, it is recommended that support board(s), either 1x4’s or 1/2" (minimum) plywood first be attached across a pair of studs and then the heater should be attached to the support boards. See Fig 1. Expansion and contraction of piping due to changing water temperature in the pipes imparts movement to the heater which, if mounted directly to a brittle, friable board, such as plasterboard, can cause failure of mounting.
Before installing the unit, be certain you have the correct heater for your type of Gas – Propane or Natural Gas.
Identification labels are found on the shipping box, and on the rating plate which is located on the right side panel of the cover. Also, each burner orifice is stamped with a num- ber (79 for LPG and 120 for Natural Gas).
WALL STUDS
5 ½”
SUPPORT BOARD
1” X 4”
SPACE BOARD
Fig. 1 - Mounting the Heater
VENTING
Vent pipe connection. WARNING: Do not reduce the vent pipe size.
This appliance must be vented to the outside following all local ordinances and specifications for installing a gas appliance vent or chimney. The venting system must be designed and constructed so as to develop a positive flow adequate to remove flue gasses to the outdoors. Minimum vent size must be 4". Minimum height must be 6 feet, provided there are no elbows. Termination of vent must be 2 feet above any obstruction within a 10 foot radius. Consult your gas utility or National Fuel Gas Code if vent will have elbows or share venting with another appliance. The vent connector should have as much vertical rise as possible (minimum 12”) before any horizontal run. The appliance must be located as close as practicable to a chimney or vent. The vent pipe sections must be secured to each other with sheet metal screws. Keep in mind the minimum clearance from the top of your heater. Remember also that single wall vent pipe connectors require a 6 inch clearance from combustibles. National Fuel Gas Code specifies double wall — Type “B” — vent pipe be used in cold climates and for gas vents running through attics. We consider double wall vent pipe preferable in all circumstances. Any vent section greater than 45 degrees from vertical is considered horizontal. Horizontal sections of vent connectors must slope upwards at least 1/4 inch for every foot of its horizontal length. Keep the horizontal section short and avoid too many elbows.
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