DIRECT VENT GRAVITY GAS WALL HEATER 11
Gas Supply and Piping
The gas control valve is shipped with a sealed cover over the gas
inlet tapping. Do not remove seal until you are ready to connect
piping.
WARNING: Danger of property damage, bodily injury or
death. Make sure the furnace is equipped to operate on the
type of gas available. Models designated as natural gas are
to be used with natural gas only. Furnaces designated for
use with propane gas have orices sized for commercially
pure propane gas. They cannot be used with butane or a
mixture of butane and propane.
GAS SUPPLY
Minimum gas supply pressure for natural gas to the furnace control
valve is 5 inches water column and must not be more than 7 inches
water column.
Minimum gas supply pressure for propane gas to the furnace control
valve must be at least 11 inches water column and must not exceed
13 inches water column.
Gas pressures and pressures to the burners must not exceed the
rated input and pressure shown on the rating plate. For natural
gas, the manifold pressure should be 4 inches water column. The
manifold pressure should be 10 inches water column for propane
gas. An orice change may be required to suit the gas supplied.
Orice Sizes
The eciency rating of these appliances is a product thermal
eciency rating determined under continuous operating
conditions and determined independently of any installed system.
For elevations above 2,000 feet reduce ratings 4% for each 1,000
feet above sea level.
The correct orice sizes for the dierent input ratings when using
natural or propane gas are:
FIGURE 10
FIGURE 11
CAPACITY AND ORIFICE SIZING
MODEL
NUMBER
GAS
TYPE
INPUT
RATING
BUT/hr.
HEATING
CAPACITY
RATING
BUT/hr.
MAIN BURNER ORIFICE
DRILL DEC QTY
CDV14 NATURAL 14,000 9,800 #50 .0700 1
CDV14 PROPANE 14,000 9,800 #56 .0460 1
CDV22 NATURAL 22,000 16,210 #44 .0860 1
CDV22 PROPANE 22,000 16,210 N/A .0560 1
CDV30 NATURAL 30,000 21,000 #39 .0990 1
CDV30 PROPANE 30,000 21,000 N/A .0640 1
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