COZY TOP VENT GRAVITY GAS WALL HEATER 17
GAS SUPPLY AND PIPING
The gas control valve, in the furnace, is shipped with a seal over
the gas inlet tapping. Do not remove the seal until ready to connect
the piping.
WARNING: Danger of property damage, bodily injury
or death. Make sure the furnace is equipped to operate
o the type of gas available. Models designed as natural
gas are to be used with natural gas only. Models
designed for use with liquefied petroleum propane gas
have orifices sized for commercially pure propane gas.
They cannot be used with butane or a mixture of butane
and propane.
GAS SUPPLY
For propane gas the minimum inlet gas supply pressure for the
purpose of input adjustment is 11-inches water column. The
maximum inlet gas supply pressure is 13-inches water column.
For natural gas, the minimum inlet gas supply pressure for the
purpose of input adjustment is 5-inches water column. The
maximum inlet as supply pressure is 7-inches water column.
Gas pressure and input to the burners must not exceed the
rated input and pressure shown on the nameplate. The natural
gas manifold pressure should be 4-inches water column. The
manifold pressure should be 10-inches water column for propane
gas. For operation in elevations above 2,000 feet, a burner orifice
change may be required to suit the gas supplied. Check with your
local gas supplier.
ORIFICE SIZES
The efficiency rating of this appliance is a product thermal
efficiency rating determined under continuous operating
conditions and was determined independently of any installed
system. For elevations above 2,000 feet, reduce ratings 4% for
each 1,000 feet above sea level.
INSTALLING YOUR FURNACE
FURNACE TECHNICAL INFORMATION
MODEL
NUMBER
GAS
TYPE
INPUT
RATING
BTU/hr.
HEATING
CAPACITY
RATING
BTU/hr.
MAIN BURNER ORIFICE
DRILL DECIMAL
QUANTITY
C255H NATURAL 25,000 17,870 #43 0.089 1
C256H PROPANE 25,000 17,870 .057" 1
C355H NATURAL 35,000 23,700 #36 0.106 1
C356H PROPANE 35,000 23,700 .069" 1
C505H NATURAL 50,000 36,900 .091" 2
C506H PROPANE 50,000 36,900 .058" 2
GAS CONVERSION KITS
NATURAL GAS TO PROPANE GAS
8913 255H / 256H SERIES
8914 355H / 356H SERIES
8909 505H / 506H SERIES
PROPANE GAS TO NATURAL GAS
8915 255H / 256H SERIES
8916 355H / 356H SERIES
8912 505H / 506H SERIES
GAS PIPING
The gas supply line must be of adequate size to handle the Btu/hr.
requirements and length of the run for the unit being installed.
Determine the minimum pipe size from Figure 13, based on the
length of the run from the gas meter to the unit.
All piping must comply with local codes and ordinances or with the
National Fuel Gas Code (ANSI Z223.1 NFPA No. 54), whichever
applies. (In Canada: CAN/C.GA B149). Refer to FIGURE 14 for the
general layout of the unit. It shows the basic fittings needed.
The following rules apply:
1. Use new, properly reamed steel or black iron pipe and
fittings free of metal chips and debris that are approved by
local codes. Metal chips and debris can damage the valve.
2. Do not thread pipe too far. Valve distortion or malfunction
may result from excess pipe within the gas control valve.
Apply a moderate amount of good quality dope to the
pipe only. Leave the two end threads bare. Figure 15
3. Use ground joint unions.
4. Install a drip leg (sediment trap) to trap dirt and moisture
before it can enter the gas valve. The nipple must be a
minimum of 3-inches long.
5. Install a manual shutoff valve.
6. Provide a 1/8’ NPT test gauge connection immediately
before the gas supply connection to the furnace.
FIGURE 13 - PIPE CAPACITY - BTU/hr. WITH FITTINGS
NATURAL GAS
LENGTH OF
PIPE FEET
PIPE SIZE
1/2"
3/4" 1"
20
40
60
92,000
63,000
50,000
190,000
130,000
105,000
350,000
245,000
195,000
PROPANE
LENGTH OF
PIPE FEET
PIPE SIZE
1/2"
3/4" 1"
20
40
60
189,000
129,000
103,000
393,000
267,000
217,000
732,000
504,000
409,000
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