Gas Supply And Piping - COZY C255H Manual Del Propietário

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.
FURNACE TECHNICAL INFORMATION
INPUT
MODEL GAS
RATING
NUMBER TYPE
BTU/hr.
C255H NATURAL 25,000
C256H PROPANE 25,000
C355H NATURAL 35,000
C356H PROPANE 35,000
C505H NATURAL 50,000
C506H PROPANE 50,000
INSTALLING YOUR FURNACE
HEATING
MAIN BURNER ORIFICE
CAPACITY
RATING
DRILL DECIMAL QUANTITY
BTU/hr.
17,870 #43 0.089
17,870 .057"
23,700 #36 0.106
23,700 .069"
36,900 .091"
36,900 .058"
8913
8914
8909
8915
8916
8912
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
LENGTH OF
1
PIPE FEET
1
20
1
40
60
1
2
2
LENGTH OF
PIPE FEET
20
40
60
GAS CONVERSION KITS
NATURAL GAS TO PROPANE GAS
255H / 256H SERIES
355H / 356H SERIES
505H / 506H SERIES
PROPANE GAS TO NATURAL GAS
255H / 256H SERIES
355H / 356H SERIES
505H / 506H SERIES
NATURAL GAS
PIPE SIZE
3/4"
1/2"
190,000
92,000
130,000
63,000
50,000
105,000
PROPANE
PIPE SIZE
3/4"
1/2"
393,000
189,000
267,000
129,000
103,000
217,000
COZY TOP VENT GRAVITY GAS WALL HEATER
1"
350,000
245,000
195,000
1"
732,000
504,000
409,000
17